EP0126626B1 - Resonant waveguide aperture manifold - Google Patents
Resonant waveguide aperture manifold Download PDFInfo
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- EP0126626B1 EP0126626B1 EP19840303356 EP84303356A EP0126626B1 EP 0126626 B1 EP0126626 B1 EP 0126626B1 EP 19840303356 EP19840303356 EP 19840303356 EP 84303356 A EP84303356 A EP 84303356A EP 0126626 B1 EP0126626 B1 EP 0126626B1
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- waveguide
- line
- elements
- phase
- radiating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
- H01Q3/267—Phased-array testing or checking devices
Definitions
- the invention relates generally to phase-stable manifolds and, in particular, a resonant waveguide for monitoring a scanning beam antenna essentially independent of temperature and frequency over a practical range and for monitoring a scanning beam antenna at a scan angle which is not aligned with the boresight direction of the antenna.
- Slotted waveguides are sometimes used as aperture manifolds which couple to the radiated signal of a phased-array antenna to monitor its performance.
- Such waveguide manifolds are used in Microwave Landing System (MLS) ground systems for producing a signal equivalent to a signal viewed by a receiver at a specific angle within the coverage volume of the ground system.
- MLS Microwave Landing System
- Such waveguide manifolds provide a far-field view of the scanning beam of the ground system and, additionally, measure the antenna insertion phase and amplitude associated with each individual array element.
- Waveguide manifolds used to monitor elevation and azimuth scanning beams of an MLS ground system have been waveguides which propagate travelling waves and, consequently, the phasing characteristics are frequency and temperature dependent. The result is that the scan angle of the beam monitored at the waveguide output is also temperature and frequency dependent. Furthermore, for monitoring MLS azimuth scanning, a travelling wave manifold does not inherently monitor the zero degree course over the MLS operating frequency bandwidth. This is because the beam pointing characteristic of a travelling wave manifold is frequency and temperature dependent.
- monitoring apparatus for coupling to a scanning beam antenna, said antenna comprising an array of radiating elements spaced apart from one another by a given distance and fed with energy in selected varying relative phases to cause the array to radiate a desired radiation pattern and to scan said pattern across a selected angular region, said monitoring apparatus being adapted to monitor said radiating antenna in respect of a predetermined scan angle; said monitoring apparatus characterized by: a transmission line for directing electromagnetic energy in a predetermined frequency range, said line having first and second ends; a first short circuit at the first end of said line; a second short circuit at the second end of said line, whereby said line is a resonant line; a low VSWR transducer coupled to said line between said first and second ends to convert electromagnetic energy, having a frequency within said predetermined frequency range and propagating along the line, into an electrical output signal; a plurality of sampling elements adapted to be coupled to respective individual radiating elements of said phased array, said sampling elements being coupled to said line at spaced apart points along
- US-A-3328800 describes apparatus comprising: a transmission line for directing electromagnetic energy in a predetermined frequency range, said line having first and second ends; means for introducing energy having a frequency within the predetermined frequency range into said transmission line; a first short circuit at the first end of said line; and a second short circuit at the second end of said line, whereby said transmission line is resonant.
- That described apparatus is a radiating antenna whereas the present invention relates to apparatus for monitoring radiated signals such as signals radiated by a radiating antenna.
- an efficient radiating antenna is not suitable for use as monitoring apparatus.
- US-A-3293550 describes the use of a single input waveguide for monitoring the signals present in another waveguide.
- the other waveguide does not radiate, i.e. energy present therein is contained therein and the waveguide is not an antenna whose radiated output is to be monitored.
- the single input waveguide is coupled to the energy waveguide at a single port element.
- a prior art travelling wave manifold 100 made of conductive material is provided with an output transducer such as connector 101 which receives a wave propagating along propagation path 102 which is terminated in absorber 103 or other non-reflecting terminating means at the far end.
- Side 104 functions as a short circuit which reflects waves propagating to the left.
- Side 105 of waveguide 100 is provided with weakly coupled input slots 106, 107, 108, 109, 110, 111, 112 and 113 having spacing d.
- phase relationship between adjacent slots 106 and 107 is given by the following formula: As shown by the formula, the phase of slot 107 ( ⁇ 107) as compared to the phase of slot 106 ( ⁇ 106) is dependent upon the spacing d and the waveguide wavelength ( ⁇ g ). All other adjacent slots have similar phase relationships. Since spacing d is temperature dependent (conductive material such as copper or aluminum expands or contracts with temperature variations) and the waveguide wavelength ⁇ g is frequency dependent, travelling wave manifold 100 is both frequency and temperature dependent.
- the monitored beam pointing angle, ⁇ , for the travelling wave manifold having adjacent slots fed in phase opposition is represented by a corresponding signal at the manifold output connector as a result of excitations imparted at the manifold slots.
- ⁇ arc sin ⁇ (1 - ( ⁇ o f o / ⁇ co f)2 - ⁇ o f o /2df)
- an aperture manifold 4 is associated with the antenna elements of array 1.
- Manifold 4 may be any means for forming a signal provided by output 12 which represents a beam pointing angle of the radiated beam.
- manifold 4 is a highly phase stable waveguide or manifold, such as the invention, coupled to the array 2 and center-fed to avoid inherent frequency (phase) and temperature effects. Center feeding also eliminates first-order dependence on frequency and absolute temperature variations.
- manifold 4 refers to any type of device for sampling signals including a waveguide, a printed circuit network, a coaxial line network or a power combiner.
- a phase stable manifold is, by definition, one in which the beam formed by summing of the slot excitations is insensitive to frequency and temperature changes and is used in combination with a phased array in accordance with this invention to detect error at a specific beam pointing angle.
- Manifold 4 is equivalent in function to a probe located in space at a specific angle with respect to the phased array.
- a manifold in accordance with the present invention may be a slotted waveguide configured to monitor radiated energy such that there is equal, non-zero phase and equal amplitude at all sample points (i.e. slot locations) of the manifold.
- the output 12 of manifold 4 is coupled to means 5, associated with means 3, for controlling the scanning of the radiated beam in response to the output 12 of manifold 4.
- FIG 3 illustrates a resonant waveguide 200 according to the invention.
- Waveguide 200 is provided with a first end 201 terminating in a short circuit such as a conductive sheet of metal perpendicular to the sides of waveguide 200 and a second end 202 terminating in a short circuit.
- Waveguide 200 is center fed by a transducer which converts an electrical signal into electromagnetic energy and vice versa.
- the transducer is any connector well known in the prior art such as output connector 203 which receive waves propagating in both directions along path 204.
- Side 205 of waveguide 200 is provided with slots 206, 207, 208, 209, 210, 211, 212, 213, and 214 for coupling to a radiating antenna.
- Figure 4 illustrates a 180 o degree phase compensating pattern of the coupling slots which will be described below.
- Figures 5 and 6 illustrate preferred rectangular crossections of waveguide 200.
- an incident wave radiated by connector 203 has a constant amplitude A inc along the entire length of waveguide 200. This is because amplitude tapers in the travelling wave caused by the coupling slots is counteracted and eliminated by the resonance of waveguide 200.
- waveguide 200 may be used in either a transmitting or receiving mode.
- connector 203 In the transmitting mode, connector 203 is connected via isolator 215 to a signal source (not shown). The signal is converted by connector 203 to electromagnetic wave energy which propagates along waveguide 200 and is radiated by slots 206-214.
- slots 206-214 are illuminated by electromagnetic wave energy which propagates along waveguide 200 and is converted by connector 203 into an electrical signal.
- the invention has been described in a receiving mode.
- Figure 8 is an illustration of the incident phase ⁇ inc of the wave radiated by connector 203 and illustrates that the phase along waveguide 200 is linearly changing.
- figure 9 illustrates that the amplitude of the reflected wave A ref is constant along the entire length of waveguide 200.
- the phase of the reflected wave ⁇ ref propagating within waveguide 200 is linearly changing with distance.
- the result, as illustrated in figure 11, is a standing wave having a plurality of cells of alternating phase of zero degrees and 180 degrees between spacing d of the slots.
- each slot is located within one of the standing wave cells of waveguide 200 so that the resulting manifold output will be temperature and frequency independent as long as the variations in temperature and frequency are within the range such that there is one and only one slot or group of slots located within each standing wave cell.
- This aperture manifold provides a beam forming capability which is independent of frequency and temperature since the phase within each standing wave cell is constant.
- isolator 215 is located within the line feeding connector 203.
- each slot is located within one of the standing wave cells of waveguide 200.
- the resulting manifold output will have equal phase for each coupling slot and will be temperature and frequency independent as long as the variations in temperature and frequency are within the range such that there is one and only one slot or group of slots located within each standing wave cell.
- the resulting manifold output will approximate an 11.25 o beam pointing angle.
- This aperture manifold provides a beam forming capability which is independent of frequency and temperature since the phase within each standing wave cell is constant.
- isolator 215 is located within the line feeding connector 203.
- the beam pointing angle is generally not 0 o and the beam radiated by manifold 200 is not perpendicular to path 204 because of the nonequal phasing of the groups of slots.
- slots 206-214 may be phased to approximate any beam pointing angle desired.
- the range of the actual beam pointing angles which the slots of a particular manifold may approximate are limited by the physical configuration of the particular manifold. In any case, therefore, the phasing of manifold 200 is independent of frequency and coupling slot spacing over the operational frequency bandwidth.
- input connector 203 is initially matched to waveguide 200 as if each end of waveguide 200 terminated in a non-reflecting absorber as shown in the prior art illustrated in figure 1.
- Such a matched connector 203 is employed with waveguide 200 terminating in short circuits as illustrated in figure 3 thereby resulting in the resonant standing wave as shown in figure 11.
- the required waveguide wavelength ⁇ g is twice the spacing d between coupling slots 206-214.
- This spacing d is determined by the radiating characteristics of the phased array antenna associated with waveguide 200 and is typically slightly larger than 1/2 wavelength.
- ridge loading as shown in Figure 6 is used to obtain this result.
- opposing ridges 250R and 260R are located within waveguide 200R for eliminating odd mode resonance which may disturb the amplitude and phase of the slot excitations.
- the maximum length, L, of a manifold according to the invention is limited by the operational frequency bandwidth of the phased array antenna with which it is associated. To limit the beam distortions caused by amplitude taper at the band edges, length L should not exceed the value given below: L ⁇ ⁇ o f o /2(f max ⁇ (1 - (1 - ⁇ o f o / ⁇ co f max )2) - f min ⁇ (1 - (1 - ⁇ o f o / ⁇ co f min )2))
- two similar manifolds can be interconnected with equal length stable transmission lines.
- Waveguide 300 may be one of a series of parallel waveguides forming the azimuth antenna of a Microwave Landing System (MLS) ground system. Such a ground system requires monitoring to evaluate its performance.
- waveguide 200R functions as a manifold and is associated with each of the parallel waveguides 300. Ridge loading in waveguide 200R in the form of ridges 250R and 260R is used to match the guide wavelength of waveguide 200 to the required spacing of radiating waveguides 300.
- waveguide 300 with polarized radiating slots 301 has a non-polarized opening 302 coupled to slot 208R.
- Other vertical waveguides would be coupled to slots 206R and 207R.
- Figure 13 illustrates another MLS ground system coupling configuration having non-polarized holes 506R, 507R and 508R in broad wall 509R of waveguide 500R and having ridge 510R on broad wall 511R.
- the non-polarized holes are coupled to parallel radiating waveguides such as waveguide 300 by polarized slot 303.
- polarized slot 303 For this configuration the required 180 degree phase reversals between adjacent coupling holes is incorporated in the design of waveguide 300.
- Adjacent waveguides 300 have a 180 o phase reversal at their input wave launchers i.e. slot 303.
- Figure 14 illustrates another MLS ground system coupling configuration wherein slots 206, 206a, 207, 207a, 208, 208a, are coupled to dipole array 400 which may function as an MLS elevation antenna.
- this invention has been particularly described with regard to its function as an elevation manifold, it may be used as an azimuth manifold or other array monitor.
Description
- The invention relates generally to phase-stable manifolds and, in particular, a resonant waveguide for monitoring a scanning beam antenna essentially independent of temperature and frequency over a practical range and for monitoring a scanning beam antenna at a scan angle which is not aligned with the boresight direction of the antenna.
- Slotted waveguides are sometimes used as aperture manifolds which couple to the radiated signal of a phased-array antenna to monitor its performance. Such waveguide manifolds are used in Microwave Landing System (MLS) ground systems for producing a signal equivalent to a signal viewed by a receiver at a specific angle within the coverage volume of the ground system. Ideally, such waveguide manifolds provide a far-field view of the scanning beam of the ground system and, additionally, measure the antenna insertion phase and amplitude associated with each individual array element.
- Waveguide manifolds used to monitor elevation and azimuth scanning beams of an MLS ground system have been waveguides which propagate travelling waves and, consequently, the phasing characteristics are frequency and temperature dependent. The result is that the scan angle of the beam monitored at the waveguide output is also temperature and frequency dependent. Furthermore, for monitoring MLS azimuth scanning, a travelling wave manifold does not inherently monitor the zero degree course over the MLS operating frequency bandwidth. This is because the beam pointing characteristic of a travelling wave manifold is frequency and temperature dependent.
- It is an object of this invention to provide apparatus for monitoring radiated signals and which is capable of operating independently of temperature and frequency over practical ranges thereof.
- According to the present invention there is provided monitoring apparatus for coupling to a scanning beam antenna, said antenna comprising an array of radiating elements spaced apart from one another by a given distance and fed with energy in selected varying relative phases to cause the array to radiate a desired radiation pattern and to scan said pattern across a selected angular region, said monitoring apparatus being adapted to monitor said radiating antenna in respect of a predetermined scan angle;
said monitoring apparatus characterized by:
a transmission line for directing electromagnetic energy in a predetermined frequency range, said line having first and second ends;
a first short circuit at the first end of said line;
a second short circuit at the second end of said line, whereby said line is a resonant line;
a low VSWR transducer coupled to said line between said first and second ends to convert electromagnetic energy, having a frequency within said predetermined frequency range and propagating along the line, into an electrical output signal;
a plurality of sampling elements adapted to be coupled to respective individual radiating elements of said phased array, said sampling elements being coupled to said line at spaced apart points along said line to create in use a resonant standing wave having a plurality of cells of alternate opposite phase along said line; and
each said sampling element or a group of said sampling elements being located within a respective one of said cells to provide substantially equal phasing to each said radiating element, whereby in use said electrical output signal from said transducer represents energy radiated by said array at said predetermined scan angle. - US-A-3328800 describes apparatus comprising:
a transmission line for directing electromagnetic energy in a predetermined frequency range, said line having first and second ends;
means for introducing energy having a frequency within the predetermined frequency range into said transmission line;
a first short circuit at the first end of said line; and
a second short circuit at the second end of said line, whereby said transmission line is resonant. - That described apparatus is a radiating antenna whereas the present invention relates to apparatus for monitoring radiated signals such as signals radiated by a radiating antenna. an efficient radiating antenna is not suitable for use as monitoring apparatus.
- US-A-3293550 describes the use of a single input waveguide for monitoring the signals present in another waveguide. The other waveguide does not radiate, i.e. energy present therein is contained therein and the waveguide is not an antenna whose radiated output is to be monitored. The single input waveguide is coupled to the energy waveguide at a single port element.
- An embodiment of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
- Figure 1 is a longitudinal cross-sectional view of a travelling waveguide according to the prior art.
- Figure 2 is a simplified block diagram illustrating one use of an aperture manifold as described in co-pending European application No. 83.304471.2 filed 3rd August, 1983 for Scanning Antenna With Automatic Beam Stabilization, incorporated herein by reference.
- Figure 3 is a longitudinal cross-sectional view of a resonant waveguide according to the invention.
- Figure 4A is a perspective view of one side of a resonant waveguide according to the invention showing the slots therein.
- Figure 4B is a perspective view of one side of an asymmetric resonant waveguide according to the invention showing the adjacent groups of slots of alternating phase wherein each group has adjacent slots fed in phase opposition.
- Figure 5 is a transverse cross-sectional view of one resonant waveguide according to the invention illustrating its rectangular configuration.
- Figure 6 is a transverse cross-sectional view of another resonant waveguide according to the invention illustrating its ridged rectangular configuration.
- Figure 7 is an amplitude diagram of an incident wave propagating within a waveguide according to the invention.
- Figure 8 is a phase diagram of an incident wave propagating within a waveguide according to the invention.
- Figure 9 is an amplitude diagram of a reflected wave propagating within a waveguide according to the invention.
- Figure 10 is a phase diagram of a reflected wave propagating within a waveguide according to the invention.
- Figure 11 is a diagram of the standing wave generated within a resonant waveguide according to the invention.
- Figure 12 is one illustration of the resonant waveguide according to the invention coupled by means of slots to the radiating waveguide column of an MLS azimuth antenna.
- Figure 13 is another illustration of a resonant waveguide according to the invention coupled by means of holes to the radiating waveguide column of an MLS azimuth antenna.
- Figure 14 is an illustration of a resonant waveguide according to the invention coupled by means of slots to the radiating waveguide column of an MLS elevation antenna.
- As shown in figure 1, a prior art
travelling wave manifold 100 made of conductive material is provided with an output transducer such asconnector 101 which receives a wave propagating alongpropagation path 102 which is terminated in absorber 103 or other non-reflecting terminating means at the far end.Side 104 functions as a short circuit which reflects waves propagating to the left.Side 105 ofwaveguide 100 is provided with weakly coupledinput slots adjacent slots
As shown by the formula, the phase of slot 107 (φ₁₀₇) as compared to the phase of slot 106 (φ₁₀₆) is dependent upon the spacing d and the waveguide wavelength (λg). All other adjacent slots have similar phase relationships. Since spacing d is temperature dependent (conductive material such as copper or aluminum expands or contracts with temperature variations) and the waveguide wavelength λg is frequency dependent,travelling wave manifold 100 is both frequency and temperature dependent. - The monitored beam pointing angle, ϑ, for the travelling wave manifold having adjacent slots fed in phase opposition is represented by a corresponding signal at the manifold output connector as a result of excitations imparted at the manifold slots. By reciprocity, it may be defined as the pointing angle of a beam radiated by the manifold output slots as a result of excitations imparted by the manifold input connector. The monitored beam pointing angle is given by:
where - λo
- = reference free space wavelength (design center)
- λco
- = waveguide cutoff wavelength
- fo
- = reference frequency
- f
- = frequency of excitations
- The properties of a scanning antenna and techniques for selecting design parameters such as aperture length, element spacing and the particular configuration of the distribution network 2 are well known in the prior art. A review of these parameters is completely described in U.S. Patent No. 4,041,501.
- In order to stabilize the beam pointing angle of the radiated beam, an
aperture manifold 4 is associated with the antenna elements of array 1.Manifold 4 may be any means for forming a signal provided byoutput 12 which represents a beam pointing angle of the radiated beam. Preferably,manifold 4 is a highly phase stable waveguide or manifold, such as the invention, coupled to the array 2 and center-fed to avoid inherent frequency (phase) and temperature effects. Center feeding also eliminates first-order dependence on frequency and absolute temperature variations. - As used herein,
manifold 4 refers to any type of device for sampling signals including a waveguide, a printed circuit network, a coaxial line network or a power combiner. A phase stable manifold is, by definition, one in which the beam formed by summing of the slot excitations is insensitive to frequency and temperature changes and is used in combination with a phased array in accordance with this invention to detect error at a specific beam pointing angle.Manifold 4 is equivalent in function to a probe located in space at a specific angle with respect to the phased array. A manifold in accordance with the present invention may be a slotted waveguide configured to monitor radiated energy such that there is equal, non-zero phase and equal amplitude at all sample points (i.e. slot locations) of the manifold. - The
output 12 ofmanifold 4 is coupled tomeans 5, associated withmeans 3, for controlling the scanning of the radiated beam in response to theoutput 12 ofmanifold 4. - Figure 3 illustrates a
resonant waveguide 200 according to the invention.Waveguide 200 is provided with afirst end 201 terminating in a short circuit such as a conductive sheet of metal perpendicular to the sides ofwaveguide 200 and asecond end 202 terminating in a short circuit.Waveguide 200 is center fed by a transducer which converts an electrical signal into electromagnetic energy and vice versa. Preferably, the transducer is any connector well known in the prior art such asoutput connector 203 which receive waves propagating in both directions alongpath 204.Side 205 ofwaveguide 200 is provided withslots waveguide 200. - As shown by Figure 7, an incident wave radiated by
connector 203 has a constant amplitude Ainc along the entire length ofwaveguide 200. This is because amplitude tapers in the travelling wave caused by the coupling slots is counteracted and eliminated by the resonance ofwaveguide 200. - Due to reciprocity,
waveguide 200 may be used in either a transmitting or receiving mode. In the transmitting mode,connector 203 is connected viaisolator 215 to a signal source (not shown). The signal is converted byconnector 203 to electromagnetic wave energy which propagates alongwaveguide 200 and is radiated by slots 206-214. In the receiving mode, slots 206-214 are illuminated by electromagnetic wave energy which propagates alongwaveguide 200 and is converted byconnector 203 into an electrical signal. For convenience and according to convention, the invention has been described in a receiving mode. - Figure 8 is an illustration of the incident phase Øinc of the wave radiated by
connector 203 and illustrates that the phase alongwaveguide 200 is linearly changing. - Since
short circuits waveguide 200, figure 9 illustrates that the amplitude of the reflected wave Aref is constant along the entire length ofwaveguide 200. Similarly, the phase of the reflected wave Øref propagating withinwaveguide 200 is linearly changing with distance. The result, as illustrated in figure 11, is a standing wave having a plurality of cells of alternating phase of zero degrees and 180 degrees between spacing d of the slots. - As shown in Figure 4A, each slot is located within one of the standing wave cells of
waveguide 200 so that the resulting manifold output will be temperature and frequency independent as long as the variations in temperature and frequency are within the range such that there is one and only one slot or group of slots located within each standing wave cell. By alternating the inclination and thereby the phase of adjacent slots, the resulting manifold output will provide equal phasing to all radiating elements. This aperture manifold provides a beam forming capability which is independent of frequency and temperature since the phase within each standing wave cell is constant. To prevent transmission of the reflected wave back throughconnector 203,isolator 215 is located within theline feeding connector 203. - As shown in Figure 4B, each slot is located within one of the standing wave cells of
waveguide 200. By alternating the inclination and thereby the phase of the slots, the resulting manifold output will have equal phase for each coupling slot and will be temperature and frequency independent as long as the variations in temperature and frequency are within the range such that there is one and only one slot or group of slots located within each standing wave cell. By alternating the inclination and thereby the phase of each group A, B, C and D of slots (N=2) and by alternating inclination and thereby the phase of adjacent slots within each group, the resulting manifold output will approximate an 11.25o beam pointing angle. This aperture manifold provides a beam forming capability which is independent of frequency and temperature since the phase within each standing wave cell is constant. To prevent transmission of the reflected wave back throughconnector 203,isolator 215 is located within theline feeding connector 203. - The monitored beam pointing angle, ϑ, for
resonant manifold 200 according to the invention, over the operational frequency bandwidth, is given by:
m = any integer, i.e. 1, 2.... ∞
where d/λg is the slot spacing in guide wavelengths. Therefore, the phasing ofmanifold 200 is independent of frequency and coupling slot spacing over the operational frequency bandwidth. In the embodiment illustrated in Figure 4A, ϑ = 0o(m = ∞) and the beam radiated is perpendicular topath 204. In the embodiment illustrated in Figure 4B, the beam pointing angle is generally not 0o and the beam radiated bymanifold 200 is not perpendicular topath 204 because of the nonequal phasing of the groups of slots. For example, an MLS ground system having a center operating frequency of 5.06GHz (i.e. λ = 5.92 cm.) and a group spacing (dg) of 15.16 cm. would have a monitored beam pointing angle of 11.25o. - However, slots 206-214 may be phased to approximate any beam pointing angle desired. The range of the actual beam pointing angles which the slots of a particular manifold may approximate are limited by the physical configuration of the particular manifold. In any case, therefore, the phasing of
manifold 200 is independent of frequency and coupling slot spacing over the operational frequency bandwidth. - In order to achieve the results described above,
input connector 203 is initially matched towaveguide 200 as if each end ofwaveguide 200 terminated in a non-reflecting absorber as shown in the prior art illustrated in figure 1. Such a matchedconnector 203 is employed withwaveguide 200 terminating in short circuits as illustrated in figure 3 thereby resulting in the resonant standing wave as shown in figure 11. - To achieve the in-phase condition of the adjacent coupling slots of
waveguide 200, the required waveguide wavelength λg is twice the spacing d between coupling slots 206-214. This spacing d is determined by the radiating characteristics of the phased array antenna associated withwaveguide 200 and is typically slightly larger than 1/2 wavelength. For the Microwave Landing System elevation phased array antenna, ridge loading as shown in Figure 6 is used to obtain this result. In particular, opposingridges waveguide 200R for eliminating odd mode resonance which may disturb the amplitude and phase of the slot excitations. - The maximum length, L, of a manifold according to the invention is limited by the operational frequency bandwidth of the phased array antenna with which it is associated. To limit the beam distortions caused by amplitude taper at the band edges, length L should not exceed the value given below:
For the ICAO standard Microwave Landing System bandwidth, L is given approximately by:
where Δf/fo is the fractional design bandwidth plus a margin for fabrication tolerances.
For - Figure 12 illustrates
waveguide 200R in association withwaveguide 300 such as descibed by U.S. Patent No. 3,903,524, owned by Hazeltine Corporation.Waveguide 300 may be one of a series of parallel waveguides forming the azimuth antenna of a Microwave Landing System (MLS) ground system. Such a ground system requires monitoring to evaluate its performance. In order to provide such monitoring,waveguide 200R functions as a manifold and is associated with each of theparallel waveguides 300. Ridge loading inwaveguide 200R in the form ofridges waveguide 200 to the required spacing of radiatingwaveguides 300. Specifically,waveguide 300 with polarized radiatingslots 301 has anon-polarized opening 302 coupled to slot 208R. Other vertical waveguides would be coupled toslots - Figure 13 illustrates another MLS ground system coupling configuration having
non-polarized holes broad wall 509R ofwaveguide 500R and having ridge 510R on broad wall 511R. The non-polarized holes are coupled to parallel radiating waveguides such aswaveguide 300 bypolarized slot 303. For this configuration the required 180 degree phase reversals between adjacent coupling holes is incorporated in the design ofwaveguide 300.Adjacent waveguides 300 have a 180o phase reversal at their input wave launchers i.e.slot 303. - Figure 14 illustrates another MLS ground system coupling configuration wherein
slots dipole array 400 which may function as an MLS elevation antenna. Although this invention has been particularly described with regard to its function as an elevation manifold, it may be used as an azimuth manifold or other array monitor.
Claims (12)
- Monitoring apparatus for coupling to a scanning beam antenna (1), said antenna comprising an array of radiating elements (1) spaced apart from one another by a given distance and fed with energy in selected varying relative phases to cause the array to radiate a desired radiation pattern and to scan said pattern across a selected angular region, said monitoring apparatus being adapted to monitor said radiating antenna in respect of a predetermined scan angle;
said monitoring apparatus characterized by:
a transmission line (200) for directing electromagnetic energy in a predetermined frequency range, said line having first and second ends;
a first short circuit (201) at the first end of said line;
a second short circuit (202) at the second end of said line, whereby said line is a resonant line;
a low VSWR transducer (203) coupled to said line between said first and second ends to convert electromagnetic energy, having a frequency within said predetermined frequency range and propagating along the line, into an electrical output signal;
a plurality of sampling elements (206-214) adapted to be coupled to respective individual radiating elements of said phased array, said sampling elements being coupled to said line at spaced apart points along said line to create in use a resonant standing wave having a plurality of cells of alternate opposite phase along said line; and
each said sampling element (206-214) or a group of said sampling elements being located within a respective one of said cells to provide substantially equal phasing to each said radiating element, whereby in use said electrical output signal from said transducer (203) represents energy radiated by said array at said predetermined scan angle. - Apparatus according to Claim 1 wherein adjacent elements (Fig. 4A) have opposite phases.
- Apparatus according to Claim 1 or Claim 2 wherein said transmission line (200) comprises an electrically conductive hollow member and said elements comprise openings (206-214, 506-508) in said member.
- Apparatus according to Claim 3 wherein said electrically conductive hollow member is a linear waveguide of rectangular cross-section (Figures 5 and 6) and said openings comprise a linear array of slots spaced apart by substantially one-half of the waveguide wavelength of said member (Figure 3).
- Apparatus according to claim 4 wherein said transducer comprises a connector (203) projecting into said member.
- Apparatus according to claim 5 further including a circuit (215) for isolating from the waveguide any load connected to the connector.
- Apparatus acording to any one of claims 4 to 6 wherein said first short circuit (201) comprises a first electrically conductive member substantially perpendicular to the sides of said waveguide and attached to the first end, and said second short circuit comprises a second electrically conductive member substantially perpendicular to the sides of said waveguide and attached to the second end (Figure 3).
- Apparatus according to any one of claims 1 to 7 further including apparatus (250,260) for eliminating odd mode resonance thereby reducing amplitude and phase distortions of the element excitations.
- Apparatus according to claim 8 wherein said apparatus for eliminating comprises a ridge (250, 260) located within said member.
- Apparatus according to any one of claims 1 to 9 comprising: groups (A,B,C, D) of elements associated with said line wherein adjacent groups have different phase (Figure 4B), each group having N elements wherein adjacent elements within each group have different phases, where N is a positive even integer greater than one; whereby supplying an electrical signal having a frequency within the predetermined frequency range to the transducer results in the elements radiating a beam which is not perpendicular to the transmission line.
- Apparatus according to claim 10 wherein said elements are waveguide slots configured to approximate a beam pointing angle of approximately 11.25o(Figure 4B).
- Apparatus according to claim 10 or claim 11 wherein adjacent groups (AB,BC,CD) of elements have opposite phases and adjacent elements within each group have opposite phases (Figure 4B).
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/497,349 US4554550A (en) | 1983-05-23 | 1983-05-23 | Resonant waveguide aperture manifold |
US06/497,350 US4554551A (en) | 1983-05-23 | 1983-05-23 | Asymmetric resonant waveguide aperture manifold |
US497349 | 1995-06-30 | ||
US497350 | 1995-06-30 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0126626A2 EP0126626A2 (en) | 1984-11-28 |
EP0126626A3 EP0126626A3 (en) | 1987-02-04 |
EP0126626B1 true EP0126626B1 (en) | 1993-06-16 |
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Application Number | Title | Priority Date | Filing Date |
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EP19840303356 Expired - Lifetime EP0126626B1 (en) | 1983-05-23 | 1984-05-17 | Resonant waveguide aperture manifold |
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EP (1) | EP0126626B1 (en) |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7123204B2 (en) | 2002-04-24 | 2006-10-17 | Forster Ian J | Energy source communication employing slot antenna |
Families Citing this family (169)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE449540B (en) * | 1985-10-31 | 1987-05-04 | Ericsson Telefon Ab L M | LETTER MANAGEMENT FOR AN ELECTRICALLY CONTROLLED RADAR ANTENNA |
US5111208A (en) * | 1989-02-23 | 1992-05-05 | Hazeltine Corporation | Calibration of plural - channel system |
DE4227857A1 (en) * | 1992-08-22 | 1994-02-24 | Sel Alcatel Ag | Device for obtaining the aperture assignment of a phase-controlled group antenna |
IL107582A (en) * | 1993-11-12 | 1998-02-08 | Ramot Ramatsity Authority For | Slotted waveguide array antennas |
NL9500580A (en) * | 1995-03-27 | 1996-11-01 | Hollandse Signaalapparaten Bv | Phased array antenna equipped with a calibration network. |
US20020130817A1 (en) * | 2001-03-16 | 2002-09-19 | Forster Ian J. | Communicating with stackable objects using an antenna array |
RU2449435C1 (en) * | 2011-02-07 | 2012-04-27 | Государственное образовательное учреждение высшего профессионального образования Новгородский государственный университет имени Ярослава Мудрого | Flat array of diffraction radiation antennas and power divider used in it |
US9225048B2 (en) | 2011-02-23 | 2015-12-29 | General Electric Company | Antenna protection device and system |
US10009065B2 (en) | 2012-12-05 | 2018-06-26 | At&T Intellectual Property I, L.P. | Backhaul link for distributed antenna system |
US9113347B2 (en) | 2012-12-05 | 2015-08-18 | At&T Intellectual Property I, Lp | Backhaul link for distributed antenna system |
US9525524B2 (en) | 2013-05-31 | 2016-12-20 | At&T Intellectual Property I, L.P. | Remote distributed antenna system |
US9999038B2 (en) | 2013-05-31 | 2018-06-12 | At&T Intellectual Property I, L.P. | Remote distributed antenna system |
US8897697B1 (en) | 2013-11-06 | 2014-11-25 | At&T Intellectual Property I, Lp | Millimeter-wave surface-wave communications |
US9209902B2 (en) | 2013-12-10 | 2015-12-08 | At&T Intellectual Property I, L.P. | Quasi-optical coupler |
US9692101B2 (en) | 2014-08-26 | 2017-06-27 | At&T Intellectual Property I, L.P. | Guided wave couplers for coupling electromagnetic waves between a waveguide surface and a surface of a wire |
US9768833B2 (en) | 2014-09-15 | 2017-09-19 | At&T Intellectual Property I, L.P. | Method and apparatus for sensing a condition in a transmission medium of electromagnetic waves |
US10063280B2 (en) | 2014-09-17 | 2018-08-28 | At&T Intellectual Property I, L.P. | Monitoring and mitigating conditions in a communication network |
US9628854B2 (en) | 2014-09-29 | 2017-04-18 | At&T Intellectual Property I, L.P. | Method and apparatus for distributing content in a communication network |
US9615269B2 (en) | 2014-10-02 | 2017-04-04 | At&T Intellectual Property I, L.P. | Method and apparatus that provides fault tolerance in a communication network |
US9685992B2 (en) | 2014-10-03 | 2017-06-20 | At&T Intellectual Property I, L.P. | Circuit panel network and methods thereof |
US9503189B2 (en) | 2014-10-10 | 2016-11-22 | At&T Intellectual Property I, L.P. | Method and apparatus for arranging communication sessions in a communication system |
US9973299B2 (en) | 2014-10-14 | 2018-05-15 | At&T Intellectual Property I, L.P. | Method and apparatus for adjusting a mode of communication in a communication network |
US9762289B2 (en) | 2014-10-14 | 2017-09-12 | At&T Intellectual Property I, L.P. | Method and apparatus for transmitting or receiving signals in a transportation system |
US9627768B2 (en) | 2014-10-21 | 2017-04-18 | At&T Intellectual Property I, L.P. | Guided-wave transmission device with non-fundamental mode propagation and methods for use therewith |
US9653770B2 (en) | 2014-10-21 | 2017-05-16 | At&T Intellectual Property I, L.P. | Guided wave coupler, coupling module and methods for use therewith |
US9769020B2 (en) | 2014-10-21 | 2017-09-19 | At&T Intellectual Property I, L.P. | Method and apparatus for responding to events affecting communications in a communication network |
US9577306B2 (en) | 2014-10-21 | 2017-02-21 | At&T Intellectual Property I, L.P. | Guided-wave transmission device and methods for use therewith |
US9520945B2 (en) | 2014-10-21 | 2016-12-13 | At&T Intellectual Property I, L.P. | Apparatus for providing communication services and methods thereof |
US9780834B2 (en) | 2014-10-21 | 2017-10-03 | At&T Intellectual Property I, L.P. | Method and apparatus for transmitting electromagnetic waves |
US9564947B2 (en) | 2014-10-21 | 2017-02-07 | At&T Intellectual Property I, L.P. | Guided-wave transmission device with diversity and methods for use therewith |
US9312919B1 (en) | 2014-10-21 | 2016-04-12 | At&T Intellectual Property I, Lp | Transmission device with impairment compensation and methods for use therewith |
US9461706B1 (en) | 2015-07-31 | 2016-10-04 | At&T Intellectual Property I, Lp | Method and apparatus for exchanging communication signals |
US10340573B2 (en) | 2016-10-26 | 2019-07-02 | At&T Intellectual Property I, L.P. | Launcher with cylindrical coupling device and methods for use therewith |
US9800327B2 (en) | 2014-11-20 | 2017-10-24 | At&T Intellectual Property I, L.P. | Apparatus for controlling operations of a communication device and methods thereof |
US9954287B2 (en) | 2014-11-20 | 2018-04-24 | At&T Intellectual Property I, L.P. | Apparatus for converting wireless signals and electromagnetic waves and methods thereof |
US9680670B2 (en) | 2014-11-20 | 2017-06-13 | At&T Intellectual Property I, L.P. | Transmission device with channel equalization and control and methods for use therewith |
US9742462B2 (en) | 2014-12-04 | 2017-08-22 | At&T Intellectual Property I, L.P. | Transmission medium and communication interfaces and methods for use therewith |
US9997819B2 (en) | 2015-06-09 | 2018-06-12 | At&T Intellectual Property I, L.P. | Transmission medium and method for facilitating propagation of electromagnetic waves via a core |
US9544006B2 (en) | 2014-11-20 | 2017-01-10 | At&T Intellectual Property I, L.P. | Transmission device with mode division multiplexing and methods for use therewith |
US10009067B2 (en) | 2014-12-04 | 2018-06-26 | At&T Intellectual Property I, L.P. | Method and apparatus for configuring a communication interface |
US10243784B2 (en) | 2014-11-20 | 2019-03-26 | At&T Intellectual Property I, L.P. | System for generating topology information and methods thereof |
US9654173B2 (en) | 2014-11-20 | 2017-05-16 | At&T Intellectual Property I, L.P. | Apparatus for powering a communication device and methods thereof |
US10144036B2 (en) | 2015-01-30 | 2018-12-04 | At&T Intellectual Property I, L.P. | Method and apparatus for mitigating interference affecting a propagation of electromagnetic waves guided by a transmission medium |
US9876570B2 (en) | 2015-02-20 | 2018-01-23 | At&T Intellectual Property I, Lp | Guided-wave transmission device with non-fundamental mode propagation and methods for use therewith |
US9749013B2 (en) | 2015-03-17 | 2017-08-29 | At&T Intellectual Property I, L.P. | Method and apparatus for reducing attenuation of electromagnetic waves guided by a transmission medium |
US9705561B2 (en) | 2015-04-24 | 2017-07-11 | At&T Intellectual Property I, L.P. | Directional coupling device and methods for use therewith |
US10224981B2 (en) | 2015-04-24 | 2019-03-05 | At&T Intellectual Property I, Lp | Passive electrical coupling device and methods for use therewith |
US9793954B2 (en) | 2015-04-28 | 2017-10-17 | At&T Intellectual Property I, L.P. | Magnetic coupling device and methods for use therewith |
US9948354B2 (en) | 2015-04-28 | 2018-04-17 | At&T Intellectual Property I, L.P. | Magnetic coupling device with reflective plate and methods for use therewith |
US9871282B2 (en) | 2015-05-14 | 2018-01-16 | At&T Intellectual Property I, L.P. | At least one transmission medium having a dielectric surface that is covered at least in part by a second dielectric |
US9490869B1 (en) | 2015-05-14 | 2016-11-08 | At&T Intellectual Property I, L.P. | Transmission medium having multiple cores and methods for use therewith |
US9748626B2 (en) | 2015-05-14 | 2017-08-29 | At&T Intellectual Property I, L.P. | Plurality of cables having different cross-sectional shapes which are bundled together to form a transmission medium |
US10679767B2 (en) | 2015-05-15 | 2020-06-09 | At&T Intellectual Property I, L.P. | Transmission medium having a conductive material and methods for use therewith |
US10650940B2 (en) | 2015-05-15 | 2020-05-12 | At&T Intellectual Property I, L.P. | Transmission medium having a conductive material and methods for use therewith |
US9917341B2 (en) | 2015-05-27 | 2018-03-13 | At&T Intellectual Property I, L.P. | Apparatus and method for launching electromagnetic waves and for modifying radial dimensions of the propagating electromagnetic waves |
US10348391B2 (en) | 2015-06-03 | 2019-07-09 | At&T Intellectual Property I, L.P. | Client node device with frequency conversion and methods for use therewith |
US10103801B2 (en) | 2015-06-03 | 2018-10-16 | At&T Intellectual Property I, L.P. | Host node device and methods for use therewith |
US9866309B2 (en) | 2015-06-03 | 2018-01-09 | At&T Intellectual Property I, Lp | Host node device and methods for use therewith |
US10812174B2 (en) | 2015-06-03 | 2020-10-20 | At&T Intellectual Property I, L.P. | Client node device and methods for use therewith |
US10154493B2 (en) | 2015-06-03 | 2018-12-11 | At&T Intellectual Property I, L.P. | Network termination and methods for use therewith |
US9912381B2 (en) | 2015-06-03 | 2018-03-06 | At&T Intellectual Property I, Lp | Network termination and methods for use therewith |
US9913139B2 (en) | 2015-06-09 | 2018-03-06 | At&T Intellectual Property I, L.P. | Signal fingerprinting for authentication of communicating devices |
US10142086B2 (en) | 2015-06-11 | 2018-11-27 | At&T Intellectual Property I, L.P. | Repeater and methods for use therewith |
US9608692B2 (en) | 2015-06-11 | 2017-03-28 | At&T Intellectual Property I, L.P. | Repeater and methods for use therewith |
US9820146B2 (en) | 2015-06-12 | 2017-11-14 | At&T Intellectual Property I, L.P. | Method and apparatus for authentication and identity management of communicating devices |
US9667317B2 (en) | 2015-06-15 | 2017-05-30 | At&T Intellectual Property I, L.P. | Method and apparatus for providing security using network traffic adjustments |
US9865911B2 (en) | 2015-06-25 | 2018-01-09 | At&T Intellectual Property I, L.P. | Waveguide system for slot radiating first electromagnetic waves that are combined into a non-fundamental wave mode second electromagnetic wave on a transmission medium |
US9640850B2 (en) | 2015-06-25 | 2017-05-02 | At&T Intellectual Property I, L.P. | Methods and apparatus for inducing a non-fundamental wave mode on a transmission medium |
US9509415B1 (en) | 2015-06-25 | 2016-11-29 | At&T Intellectual Property I, L.P. | Methods and apparatus for inducing a fundamental wave mode on a transmission medium |
US9853342B2 (en) | 2015-07-14 | 2017-12-26 | At&T Intellectual Property I, L.P. | Dielectric transmission medium connector and methods for use therewith |
US9882257B2 (en) | 2015-07-14 | 2018-01-30 | At&T Intellectual Property I, L.P. | Method and apparatus for launching a wave mode that mitigates interference |
US9836957B2 (en) | 2015-07-14 | 2017-12-05 | At&T Intellectual Property I, L.P. | Method and apparatus for communicating with premises equipment |
US10341142B2 (en) | 2015-07-14 | 2019-07-02 | At&T Intellectual Property I, L.P. | Apparatus and methods for generating non-interfering electromagnetic waves on an uninsulated conductor |
US10320586B2 (en) | 2015-07-14 | 2019-06-11 | At&T Intellectual Property I, L.P. | Apparatus and methods for generating non-interfering electromagnetic waves on an insulated transmission medium |
US10033108B2 (en) | 2015-07-14 | 2018-07-24 | At&T Intellectual Property I, L.P. | Apparatus and methods for generating an electromagnetic wave having a wave mode that mitigates interference |
US10205655B2 (en) | 2015-07-14 | 2019-02-12 | At&T Intellectual Property I, L.P. | Apparatus and methods for communicating utilizing an antenna array and multiple communication paths |
US9722318B2 (en) | 2015-07-14 | 2017-08-01 | At&T Intellectual Property I, L.P. | Method and apparatus for coupling an antenna to a device |
US10033107B2 (en) | 2015-07-14 | 2018-07-24 | At&T Intellectual Property I, L.P. | Method and apparatus for coupling an antenna to a device |
US9628116B2 (en) | 2015-07-14 | 2017-04-18 | At&T Intellectual Property I, L.P. | Apparatus and methods for transmitting wireless signals |
US9847566B2 (en) | 2015-07-14 | 2017-12-19 | At&T Intellectual Property I, L.P. | Method and apparatus for adjusting a field of a signal to mitigate interference |
US10044409B2 (en) | 2015-07-14 | 2018-08-07 | At&T Intellectual Property I, L.P. | Transmission medium and methods for use therewith |
US10148016B2 (en) | 2015-07-14 | 2018-12-04 | At&T Intellectual Property I, L.P. | Apparatus and methods for communicating utilizing an antenna array |
US10170840B2 (en) | 2015-07-14 | 2019-01-01 | At&T Intellectual Property I, L.P. | Apparatus and methods for sending or receiving electromagnetic signals |
US9793951B2 (en) | 2015-07-15 | 2017-10-17 | At&T Intellectual Property I, L.P. | Method and apparatus for launching a wave mode that mitigates interference |
US9608740B2 (en) | 2015-07-15 | 2017-03-28 | At&T Intellectual Property I, L.P. | Method and apparatus for launching a wave mode that mitigates interference |
US10090606B2 (en) | 2015-07-15 | 2018-10-02 | At&T Intellectual Property I, L.P. | Antenna system with dielectric array and methods for use therewith |
US9912027B2 (en) | 2015-07-23 | 2018-03-06 | At&T Intellectual Property I, L.P. | Method and apparatus for exchanging communication signals |
US9871283B2 (en) | 2015-07-23 | 2018-01-16 | At&T Intellectual Property I, Lp | Transmission medium having a dielectric core comprised of plural members connected by a ball and socket configuration |
US9749053B2 (en) | 2015-07-23 | 2017-08-29 | At&T Intellectual Property I, L.P. | Node device, repeater and methods for use therewith |
US10784670B2 (en) | 2015-07-23 | 2020-09-22 | At&T Intellectual Property I, L.P. | Antenna support for aligning an antenna |
US9948333B2 (en) | 2015-07-23 | 2018-04-17 | At&T Intellectual Property I, L.P. | Method and apparatus for wireless communications to mitigate interference |
US9967173B2 (en) | 2015-07-31 | 2018-05-08 | At&T Intellectual Property I, L.P. | Method and apparatus for authentication and identity management of communicating devices |
US10020587B2 (en) | 2015-07-31 | 2018-07-10 | At&T Intellectual Property I, L.P. | Radial antenna and methods for use therewith |
US9735833B2 (en) | 2015-07-31 | 2017-08-15 | At&T Intellectual Property I, L.P. | Method and apparatus for communications management in a neighborhood network |
US9904535B2 (en) | 2015-09-14 | 2018-02-27 | At&T Intellectual Property I, L.P. | Method and apparatus for distributing software |
US10051629B2 (en) | 2015-09-16 | 2018-08-14 | At&T Intellectual Property I, L.P. | Method and apparatus for use with a radio distributed antenna system having an in-band reference signal |
US10136434B2 (en) | 2015-09-16 | 2018-11-20 | At&T Intellectual Property I, L.P. | Method and apparatus for use with a radio distributed antenna system having an ultra-wideband control channel |
US10009063B2 (en) | 2015-09-16 | 2018-06-26 | At&T Intellectual Property I, L.P. | Method and apparatus for use with a radio distributed antenna system having an out-of-band reference signal |
US10079661B2 (en) | 2015-09-16 | 2018-09-18 | At&T Intellectual Property I, L.P. | Method and apparatus for use with a radio distributed antenna system having a clock reference |
US10009901B2 (en) | 2015-09-16 | 2018-06-26 | At&T Intellectual Property I, L.P. | Method, apparatus, and computer-readable storage medium for managing utilization of wireless resources between base stations |
US9769128B2 (en) | 2015-09-28 | 2017-09-19 | At&T Intellectual Property I, L.P. | Method and apparatus for encryption of communications over a network |
US9729197B2 (en) | 2015-10-01 | 2017-08-08 | At&T Intellectual Property I, L.P. | Method and apparatus for communicating network management traffic over a network |
US9876264B2 (en) | 2015-10-02 | 2018-01-23 | At&T Intellectual Property I, Lp | Communication system, guided wave switch and methods for use therewith |
US9882277B2 (en) | 2015-10-02 | 2018-01-30 | At&T Intellectual Property I, Lp | Communication device and antenna assembly with actuated gimbal mount |
US10074890B2 (en) | 2015-10-02 | 2018-09-11 | At&T Intellectual Property I, L.P. | Communication device and antenna with integrated light assembly |
US10355367B2 (en) | 2015-10-16 | 2019-07-16 | At&T Intellectual Property I, L.P. | Antenna structure for exchanging wireless signals |
US10051483B2 (en) | 2015-10-16 | 2018-08-14 | At&T Intellectual Property I, L.P. | Method and apparatus for directing wireless signals |
US10665942B2 (en) | 2015-10-16 | 2020-05-26 | At&T Intellectual Property I, L.P. | Method and apparatus for adjusting wireless communications |
US9912419B1 (en) | 2016-08-24 | 2018-03-06 | At&T Intellectual Property I, L.P. | Method and apparatus for managing a fault in a distributed antenna system |
US9860075B1 (en) | 2016-08-26 | 2018-01-02 | At&T Intellectual Property I, L.P. | Method and communication node for broadband distribution |
US10291311B2 (en) | 2016-09-09 | 2019-05-14 | At&T Intellectual Property I, L.P. | Method and apparatus for mitigating a fault in a distributed antenna system |
US11032819B2 (en) | 2016-09-15 | 2021-06-08 | At&T Intellectual Property I, L.P. | Method and apparatus for use with a radio distributed antenna system having a control channel reference signal |
US10135146B2 (en) | 2016-10-18 | 2018-11-20 | At&T Intellectual Property I, L.P. | Apparatus and methods for launching guided waves via circuits |
US10135147B2 (en) | 2016-10-18 | 2018-11-20 | At&T Intellectual Property I, L.P. | Apparatus and methods for launching guided waves via an antenna |
US10340600B2 (en) | 2016-10-18 | 2019-07-02 | At&T Intellectual Property I, L.P. | Apparatus and methods for launching guided waves via plural waveguide systems |
US9991580B2 (en) | 2016-10-21 | 2018-06-05 | At&T Intellectual Property I, L.P. | Launcher and coupling system for guided wave mode cancellation |
US10811767B2 (en) | 2016-10-21 | 2020-10-20 | At&T Intellectual Property I, L.P. | System and dielectric antenna with convex dielectric radome |
US9876605B1 (en) | 2016-10-21 | 2018-01-23 | At&T Intellectual Property I, L.P. | Launcher and coupling system to support desired guided wave mode |
US10374316B2 (en) | 2016-10-21 | 2019-08-06 | At&T Intellectual Property I, L.P. | System and dielectric antenna with non-uniform dielectric |
US10312567B2 (en) | 2016-10-26 | 2019-06-04 | At&T Intellectual Property I, L.P. | Launcher with planar strip antenna and methods for use therewith |
US10225025B2 (en) | 2016-11-03 | 2019-03-05 | At&T Intellectual Property I, L.P. | Method and apparatus for detecting a fault in a communication system |
US10498044B2 (en) | 2016-11-03 | 2019-12-03 | At&T Intellectual Property I, L.P. | Apparatus for configuring a surface of an antenna |
US10224634B2 (en) | 2016-11-03 | 2019-03-05 | At&T Intellectual Property I, L.P. | Methods and apparatus for adjusting an operational characteristic of an antenna |
US10291334B2 (en) | 2016-11-03 | 2019-05-14 | At&T Intellectual Property I, L.P. | System for detecting a fault in a communication system |
US10178445B2 (en) | 2016-11-23 | 2019-01-08 | At&T Intellectual Property I, L.P. | Methods, devices, and systems for load balancing between a plurality of waveguides |
US10340603B2 (en) | 2016-11-23 | 2019-07-02 | At&T Intellectual Property I, L.P. | Antenna system having shielded structural configurations for assembly |
US10535928B2 (en) | 2016-11-23 | 2020-01-14 | At&T Intellectual Property I, L.P. | Antenna system and methods for use therewith |
US10090594B2 (en) | 2016-11-23 | 2018-10-02 | At&T Intellectual Property I, L.P. | Antenna system having structural configurations for assembly |
US10340601B2 (en) | 2016-11-23 | 2019-07-02 | At&T Intellectual Property I, L.P. | Multi-antenna system and methods for use therewith |
US10361489B2 (en) | 2016-12-01 | 2019-07-23 | At&T Intellectual Property I, L.P. | Dielectric dish antenna system and methods for use therewith |
US10305190B2 (en) | 2016-12-01 | 2019-05-28 | At&T Intellectual Property I, L.P. | Reflecting dielectric antenna system and methods for use therewith |
US9927517B1 (en) | 2016-12-06 | 2018-03-27 | At&T Intellectual Property I, L.P. | Apparatus and methods for sensing rainfall |
US10439675B2 (en) | 2016-12-06 | 2019-10-08 | At&T Intellectual Property I, L.P. | Method and apparatus for repeating guided wave communication signals |
US10727599B2 (en) | 2016-12-06 | 2020-07-28 | At&T Intellectual Property I, L.P. | Launcher with slot antenna and methods for use therewith |
US10694379B2 (en) | 2016-12-06 | 2020-06-23 | At&T Intellectual Property I, L.P. | Waveguide system with device-based authentication and methods for use therewith |
US10326494B2 (en) | 2016-12-06 | 2019-06-18 | At&T Intellectual Property I, L.P. | Apparatus for measurement de-embedding and methods for use therewith |
US10020844B2 (en) | 2016-12-06 | 2018-07-10 | T&T Intellectual Property I, L.P. | Method and apparatus for broadcast communication via guided waves |
US10755542B2 (en) | 2016-12-06 | 2020-08-25 | At&T Intellectual Property I, L.P. | Method and apparatus for surveillance via guided wave communication |
US10135145B2 (en) | 2016-12-06 | 2018-11-20 | At&T Intellectual Property I, L.P. | Apparatus and methods for generating an electromagnetic wave along a transmission medium |
US10819035B2 (en) | 2016-12-06 | 2020-10-27 | At&T Intellectual Property I, L.P. | Launcher with helical antenna and methods for use therewith |
US10382976B2 (en) | 2016-12-06 | 2019-08-13 | At&T Intellectual Property I, L.P. | Method and apparatus for managing wireless communications based on communication paths and network device positions |
US10637149B2 (en) | 2016-12-06 | 2020-04-28 | At&T Intellectual Property I, L.P. | Injection molded dielectric antenna and methods for use therewith |
US10139820B2 (en) | 2016-12-07 | 2018-11-27 | At&T Intellectual Property I, L.P. | Method and apparatus for deploying equipment of a communication system |
US10243270B2 (en) | 2016-12-07 | 2019-03-26 | At&T Intellectual Property I, L.P. | Beam adaptive multi-feed dielectric antenna system and methods for use therewith |
US10168695B2 (en) | 2016-12-07 | 2019-01-01 | At&T Intellectual Property I, L.P. | Method and apparatus for controlling an unmanned aircraft |
US10446936B2 (en) | 2016-12-07 | 2019-10-15 | At&T Intellectual Property I, L.P. | Multi-feed dielectric antenna system and methods for use therewith |
US9893795B1 (en) | 2016-12-07 | 2018-02-13 | At&T Intellectual Property I, Lp | Method and repeater for broadband distribution |
US10547348B2 (en) | 2016-12-07 | 2020-01-28 | At&T Intellectual Property I, L.P. | Method and apparatus for switching transmission mediums in a communication system |
US10389029B2 (en) | 2016-12-07 | 2019-08-20 | At&T Intellectual Property I, L.P. | Multi-feed dielectric antenna system with core selection and methods for use therewith |
US10359749B2 (en) | 2016-12-07 | 2019-07-23 | At&T Intellectual Property I, L.P. | Method and apparatus for utilities management via guided wave communication |
US10027397B2 (en) | 2016-12-07 | 2018-07-17 | At&T Intellectual Property I, L.P. | Distributed antenna system and methods for use therewith |
US10389037B2 (en) | 2016-12-08 | 2019-08-20 | At&T Intellectual Property I, L.P. | Apparatus and methods for selecting sections of an antenna array and use therewith |
US10777873B2 (en) | 2016-12-08 | 2020-09-15 | At&T Intellectual Property I, L.P. | Method and apparatus for mounting network devices |
US10411356B2 (en) | 2016-12-08 | 2019-09-10 | At&T Intellectual Property I, L.P. | Apparatus and methods for selectively targeting communication devices with an antenna array |
US10601494B2 (en) | 2016-12-08 | 2020-03-24 | At&T Intellectual Property I, L.P. | Dual-band communication device and method for use therewith |
US9911020B1 (en) | 2016-12-08 | 2018-03-06 | At&T Intellectual Property I, L.P. | Method and apparatus for tracking via a radio frequency identification device |
US10326689B2 (en) | 2016-12-08 | 2019-06-18 | At&T Intellectual Property I, L.P. | Method and system for providing alternative communication paths |
US10530505B2 (en) | 2016-12-08 | 2020-01-07 | At&T Intellectual Property I, L.P. | Apparatus and methods for launching electromagnetic waves along a transmission medium |
US10103422B2 (en) | 2016-12-08 | 2018-10-16 | At&T Intellectual Property I, L.P. | Method and apparatus for mounting network devices |
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Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2905940A (en) * | 1957-05-02 | 1959-09-22 | Edward G Spencer | Electromagnetically steered microwave antenna |
US3293550A (en) * | 1963-07-23 | 1966-12-20 | Rca Corp | Transmit monitor |
US3328800A (en) * | 1964-03-12 | 1967-06-27 | North American Aviation Inc | Slot antenna utilizing variable standing wave pattern for controlling slot excitation |
AU508205B2 (en) * | 1975-12-24 | 1980-03-13 | Commonwealth Scientific And Industrial Research Organization | Monitoring scanning radio beams |
US4536766A (en) * | 1982-09-07 | 1985-08-20 | Hazeltine Corporation | Scanning antenna with automatic beam stabilization |
-
1984
- 1984-05-11 AU AU27924/84A patent/AU565039B2/en not_active Ceased
- 1984-05-17 EP EP19840303356 patent/EP0126626B1/en not_active Expired - Lifetime
- 1984-05-17 DE DE19843486164 patent/DE3486164T2/en not_active Expired - Fee Related
- 1984-05-18 NZ NZ20821384A patent/NZ208213A/en unknown
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7123204B2 (en) | 2002-04-24 | 2006-10-17 | Forster Ian J | Energy source communication employing slot antenna |
US7755556B2 (en) | 2002-04-24 | 2010-07-13 | Forster Ian J | Energy source communication employing slot antenna |
Also Published As
Publication number | Publication date |
---|---|
AU565039B2 (en) | 1987-09-03 |
NZ208213A (en) | 1987-10-30 |
AU2792484A (en) | 1984-11-29 |
EP0126626A3 (en) | 1987-02-04 |
EP0126626A2 (en) | 1984-11-28 |
DE3486164T2 (en) | 1994-01-13 |
DE3486164D1 (en) | 1993-07-22 |
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