US3699574A - Scanned cylindrical array monopulse antenna - Google Patents

Scanned cylindrical array monopulse antenna Download PDF

Info

Publication number
US3699574A
US3699574A US3699574DA US3699574A US 3699574 A US3699574 A US 3699574A US 3699574D A US3699574D A US 3699574DA US 3699574 A US3699574 A US 3699574A
Authority
US
United States
Prior art keywords
antenna
linear phased
means
coupled
array
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
Inventor
Francis J O'hara
Troy E Plunk
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
US Secretary of Navy
Original Assignee
US Secretary of Navy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by US Secretary of Navy filed Critical US Secretary of Navy
Priority to US86710169A priority Critical
Application granted granted Critical
Publication of US3699574A publication Critical patent/US3699574A/en
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime legal-status Critical

Links

Images

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/24Arrangements 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 orientation by switching energy from one active radiating element to another, e.g. for beam switching
    • H01Q3/242Circumferential scanning
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/26Arrangements 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
    • H01Q3/30Arrangements 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 varying the relative phase between the radiating elements of an array
    • H01Q3/32Arrangements 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 varying the relative phase between the radiating elements of an array by mechanical means

Abstract

A cylindrical antenna array system having two cylindrical subarrays flush mounted on a conducting cylinder, each consisting of a plurality of linear phased arrays fed through a pair of feed rings on the conducting cylinder that has a diode switch for each linear phased array coupled through a switching network to switch one-quarter to one-third of the linear phased arrays ON in a rotating manner to scan throughout 360* around the cylinder axis, and each linear phased array having a pair of rotatable dielectric slabs behind the waveguide slots thereof with all dielectric slabs mechanically coupled to rotate in synchronism to phase the radio waves for angular direction with respect to the cylinder axis, the received signals being coupled through a magic-T junction to provide sum and difference monopulse signals of targets in sight of the antenna.

Description

United States Patent OHara et al. 451 Oct, 17, 1972 [54] SCANNED CYLINDRICAL ARRAY MONOPULSE ANTENNA Primary Examiner-T. H. Tubbesing [72] Inventors: Francis J. OHara; Troy E. Plunk, Attorney-Edgar Brewer and Losche both of Bedford, Mass. 57] ABSTRACT [73] Asslgnee: The i g A cylindrical antenna array system having two cylinrNepresen e y e ecreta'y o t e drical subarrays flush mounted on a conducting avy cylinder, each consisting of a plurality of linear phased [22] Filed; Oct, 16, 1969 arrays fed through a pair of feed rings on the conducting cylinder that has a diode switch for each linear [211 App! 867m phased array coupled through a switching network to switch one-quarter to one-third of the linear phased 52 US. Cl. ..343/16 M, 343/100 SA, 343/705, aHays ON in a rotating manner to scan throughout 343 M68 343/854 360 around the cylinder axis, and each linear phased 51 im. Cl ..G0ls 9/22 array having a P of rotatable dielectric Slabs behind [58] Fidd of searchnm343ll6 M 100 SA 768 771 the waveguide slots thereof with all dielectric slabs 3 mechanically coupled to rotate in synchronism to phase the radio waves for angular direction with [56] References Cited respect to the cylinder axis, the received signals being coupled through a magic-T junction to provide sum UNITED STATES PATENTS and difference monopulse signals of targets in sight of th t 3,474,446 10/1969 Shestag et al ..343/100 SA 6 3,53 l ,803 9/1970 Rosen et al. ..343/l00 SA 4 Claims, 9 Drawing Figures /0 I I \I\\\\\\\ l' 13AA; \h fllIXc.L53

I \\n 1 m flflm a 20 ull. 0 .\\--\lllllfl-mfii TTT'J '.'-..'.HHHHHHHHH ilfi::::::::::::::::::::::e ::::H:::::::::::::::H+ 20 I HI-1H1. 1'. .HHHI Jill/H. 'HHHHIH SUBARRAY B 3 llllllllllllllllllIIIIIIII ,lnl llllrlllllllllllllllIII!!! III IIHIIIIIHIIIIII II (IIIIIIIIIIIIIIII 1101:! Il' IIIIIIIIIIIII "I IIIIIIIIIIIIIIIIIIIIII I "I! l l 'l I! 'IIII'IIII" III III III!!! 3/ SUBARRAY A PATENTEDBBT 11 m2 3.599.514

SHEET 1 [IF 3 SUBARRAYB 3 3/ SUBARRAYA LINEAR PHASED ARRAYS IL, THRU PHASE THRU MAGIC THRU PHASE THRU PLEXER SHIFTER PLEXER T PLEXER SHIFTER PLEXER m e 'F R a J SUBARRAY A OUT SUBARRAY a FIG. 5

a m e 33 INVEN TORS 0 0 mar E. PLU/VK Q Q y FRANCIS .1. O'HARA 35 BY 34 FEED RING TRANSMITTER F 4 ATTORNEY PATENTEU 17 I97? 3 6 9 9 5 74 sum 3 ur 3 s's" 0" PLANE 9 SCAN BEAM POSITION 20 F IG 8 SCANNED CYLINDRICAL ARRAY MONOPULSE ANTENNA BACKGROUND OF THE INVENTION This invention relates to monopulse antennas and more particularly to monopulse flush mounted cylindrical missile seeker antennas.

Until about 1962 no great need for a flush mounted missile seeker antenna was foreseen, primarily because no antenna scheme could be envisioned which could compete, performance wise, with a conventional flat plate antenna in a missile nose radome. About 1962 jet engine technology had advanced to the point where it was very likely that they could be used in high velocity missiles. In such a missile a flush mounted seeker antenna is imperative. More recent studies indicate that a flush mounted antenna can be used to improve missile kill probabilities in that the warhead can be placed in the missile nose where it is more effective. Considerable interest has been generated also in a flush mounted microwave missile seeker antenna through consideration of dual mode seeker systems. An example of the latter would be an X-band flush mounted antenna which would allow for placement of an infrared seeker in the missile nose.

SUMMARY OF THE INVENTION In the present invention two subassemblies of linear phased arrays placed longitudinally around a conduction cylinder produce a flush mounted cylindrical antenna. Each subarray has a ring feed with waveguide feed openings corresponding to openings in each linear phased array to feed same and each ring feed opening is controlled by a diode coupler that is in circuit with a switching network to control the bias on selected diode couplers to commutate a rotating group of linear phased arrays thereby producing a 360 rotation of transmitted and reflected beams of radio frequency. Each linear phased array has a pair of eccentrically rotatable dielectric slabs therein that have mechanical connections, as by gear means to a ring gear, to drive all slabs alike to phase the transmitted and reflected signals for angular direction with respect to the centerline of the cylinder. The rotatable dielectric slabs and the diode coupler switches provide a 360 beam rotation of 45 fan for both antenna arrays. The reflected signal outputs from 'both subarrays are coupled to a magic-T junction from which the signals are processed for sum and difference for target identification and angle tracking. It is therefore a general object of-this invention to provide a flush mounted monopulse cylindrical antenna array consisting of two subarrays for missiles or other aircraft vehicles for use in enemy missile detection and destruction.

BRIEF DESCRIPTION OF THE DRAWINGS These and other objects and the attendant advantages, features, and uses will become more apparent to those skilled in the art as the description proceeds when considered along with the accompanying drawings in which,

FIG. 1 is an isometric view of a missile or other aircraft device illustrating the subarray items of this invention,

FIG. 2 illustrates one of the linear phased array elements making up the composite subarray items disclosing the waveguide phasing slab adjustment means,

FIG. 3 illustrates an isometric view of the phasing slabs used in the linear array of FIG. 2,

FIG. 4 shows an isometric view of the waveguide feeder ring for the subarray antenna of FIG. 1,

FIG. 5 is a block circuit schematic in the receiver component of the antenna system, and

FIGS. 6, 7, 8, and 9, illustrate the 0 plane, the 1 plane, and the sum and difference graphs produced by the received signals of a target in space.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring more particularly to FIG. 1 with occasional reference to FIGS. 2 and 3, there is illustrated an isometric view of a device, such as a missile 10, having a nose cone 11 and a propulsion section 12 with flush mounted subarray antenna means. A and B circumferentially about the middle portion. The subarrays A and B may be placed on any aircraft device for detecting and angle tracking a target by monopulse radar means. Each subarray A and B consists of a plurality of linear phased array sections 20 more particularly shown in FIG. 2 arranged circumferentially about the central body portion of the missile device.

The linear phased array shown in FIG. 2, and identified by the reference character 20, generally consists of a rectangular waveguide section having an inlet port 21 on one end and two rows of radiating or outlet ports 22 and 23 along one face thereof. The opposite end of the linear phased array waveguide section 20 to the inlet port 21 includes an enclosed end 24 with two gear driven eccentric slabs shown by the exterior gears 25 and 26. The waveguide slabs which extend into the linear phased array waveguide 20 are more particularly shown in FIG. 3, in the reverse direction, to more particularly illustrate the two eccentric slabs 27 and 28 extending outwardly from the end plate 24. The two gears 25 and 26, together with like gears on all other linear phased array waveguide elements 20 constituting the subarray A or the subarray B, are driven in unison by a ring gear 29. The ring gear 29 is preset with the gears 25 and 26 of all the linear phased array elements 20 to cause the radar beam to radiate at the same angle with respect to the longitudinal axis of the missile device 10 for all array elements 20. One extreme of the radar beam would be approximately in the end-fire direction which produces a beam parallel to the longitudinal axis of the missile 10. The other limit of phasing the radar beam out of the linear phased array ports 22 and 23 would be about 45 from the longitudinal center line of the missile 10, the purpose of which will be more readily understood as the description proceeds. The ring gear 29 may be driven by some motor means, herein illustrated as being an electric motor 30, which may be computer controlled or otherwise automatically con trolled to phase all the linear phased arrays 20 for the same angle of transmission and reception between the limits of near end-fire and about 45. One ring gear 29 and motor means 30 are required for each subarray A and subarray B for the purpose and in the manner to be described.

Referring more particularly to FIG. 4 there is illustrated an isometric view of a rectangular waveguide feeder ring 31 which is illustrated in FIG. 1 as the circular rings 31 between subarrays A and B. While both feeder rings 31 are shown centrally in FIG. 1, it is to be understood that these feeder rings could be on opposite ends of the subarrays A and B or on the same end of each subarray A and B, as desired. Each feeder ring is made of a plurality of rectangular feeder input sections 32 having rectangular ports 33 which are connected by bolting or otherwise affixed to the inlet end of the linear phase arrays 20 so that the rectangular ports 33 of the feeder rings are each in alignment with the rectangular inlet ports 21 of the linear phased array elements 20. Each waveguide feeder ring 31 has waveguide coupling members 34 and 35 for coupling inlet and outlet waveguide sections for the radar system, as is well understood by those skilled in the radar art. Each waveguide feeder ring 31 has a crystal 36 for each ring section 32. Each crystal 36 is coupled to a switching circuit, herein illustrated in block form by the reference character 37, to switch the radio frequency as from the inlet 34 to the port 33 in a manner to activate about one-fourth to one-third of the linear phased arrays 20 at any one time. The switching circuit 37 may be any switchable electronic switch designed, such as a commutating device, to cause the one-fourth to one-third linear phase arrays to be activated in a circularly rotating manner. As may be un derstood from the description in FIG. 1, each phased array A and B will be made to produce a transmitted radar beam to travel radially outwardly from the longitudinal center line of the missile at an angle set by the phased arrays shown in FIG. 2 from near end-fire to about 45 to produce a cone scan about the missile forwardly through the 45 angle. Such transmitted radar signals will be reflected by any targets in the area illuminated by the transmitting signals and reflected back through the subarrays A and B to the radar system in a monopulse mode readily understood by those skilled in the radar art.

Referring more particularly to FIG. 5, a block diagram illustrates the components in the receiver section of the radar system in which the outlet, such as 35 from the subarray A, is applied as an input 40 to a thruplexer 41 while the output 35 of subarray B conducts as an input 42 to a thruplexer 43. The thruplexer 41 is coupled through a waveguide phase shifting means 44 through a second thruplexer 45 to a magic-T junction 46 while the thruplexer 43 is coupled through a waveguide phase shifter 47 and a second thruplexer to the magic-T 46. The output of the magic-T junction 46 is the waveguide output 49 to the receiving equipment of the monopulse radar system in the well known manner to produce sum and difference radar signals for use in angle target tracking of any radar target illuminated by the antenna. The thruplexers 41 and 43 are each waveguide adapters to convert rectangular mode waveguide inputs 40 and 42 into circular waveguide sections for the phase shifters 44 and 47. The thruplexers 45 and 48 are also waveguide adapters to reconvert the circular mode of the waveguide back to the rectangular mode for coupling to the magic-T junction 46. For the purpose of definition, the phasing of the radio frequency at an angle with respect to the longitudinal axis of the missile device by the slab means 27 and 28 may be referred to as the 0 position, while the rotation of the radio frequency circumferentially about the missile axis may be referred to as the 1 position. The radio frequency (rf) outputs (or inputs on transmit) can be added in a conventional monopulse network to produce monopulse information in the 0 direction. In antenna terminology this is a phase monopulse system in the 0 plane since the monopulse beams are formed as a result of the physical space of the two cylindrical areas in this plane. The rf beams from the two subarrays A and B can be scanned together with 0 direction by identically controlling the linear array scanning within each subarray by the motor control 30. To complete effective 0 direction scan of the sum and difference monopulse beams, it is necessary to maintain proper phase control versus scan angle 0 between the two subarrays. This is accomplished by the two phase shifters 44 and 47 although only one phase shifter may be used in either of the rf outputs from the subarrays A or B. In this way the sum and difference array factors formed by the addition or subtraction of the two subarrays A and B can be scanned in the 0 direction thus completing the phase requirements for 0 scan of the monopulse beam. The phase shifters 44 and 47 are preferably of a type to change the phase while in the circular mode since this is a more practical method.

FIG. 6 shows a graph of the subarray resulting radar signal from near end-fire in the 0 plane starting at near 0 to about 45 giving the amplitude of the signal in decibels and the abscissa co-ordinate in degrees.

FIG. 7 illustrates the sum and difference output from the end-fire angle in the 0 plane while FIG. 9 illustrates the sum and difference pattern in the 1 plane.

FIG. 8 shows the 6 scan signal for the decibel output when the scan beam is 20 from end-fire in the 1 plane.

OPERATION In the operation of the antenna means illustrated in FIGS. 1 through 5, let it be assumed that the antenna means of FIG. 1 is coupled to a conventional monopulse radar system with the received signal coupled through a circuit as shown in FIG. 5. Either by computer means of other automatic driving means the two motors 30 and the switching circuit 37 can be made operative to cause the rf beam to traverse the angle from near end-fire of the missile to approximately 45 to the longitudinal centerline of the missile for subarrays A and B while at the same time the switch circuit 37 is energizing one-third to a one-fourth of the linear phased arrays 20 to cause antenna illumination in two full circle cones of scan by both subarray antennas A and B. The returned or reflected signals from any targets in the cones of illumination will be received through the circuit of FIG. 5 to produce sum and difference signals of the target for angle tracking of that target. The output signal on the waveguide output 49 may be used for automatically piloting the missile 10, which may include a warhead element in the nose cone 1 1, to seek out, track, and collide with the enemy target missile to destroy same. If the missile 10 is of the ramjet engine type, for which this invention would be particularly adaptable, it would make this missile a high velocity missile which would improve the missile kill probability in that the warhead could be placed in the While many modifications may be made in rearrangement of parts as described herein to produce the same results and functions, we desire to be limited in the scope of our invention only as limited by the accompanying claims.

lclaim: l. A flush mounted cylindrical array monopulse scanning antenna comprising:

a conducting cylinder with two subsystems of linear l5 phased waveguide arrays arranged longitudinally around said cylinder to produce a flush cylindrical monopulse antenna;

a waveguide feeder ring on one end of each subarray to feed radio frequency into and out of said array, said feeder ring having a crystal coupler for each linear phased array with all crystal couplers coupled to a switching network to activate one-fourth to one-third of adjacent linear phased arrays in a rotating manner to scan 360 around said cylinder axis;

a pair of rotatable dielectric slabs extending through each linear phased array with rotation means thereon to rotate same to vary the phase angle and the scan beam over an angle with respect to said cylinder axis;

master means in coupled co-operation with all said rotation means of said dielectric slabs to rotate same in synchronism; and transmitting means and receiving means coupled to said waveguide feeder rings, said receiver means having means therein to obtain sum and difference of all target signals scanned by said antenna whereby said antenna is aerodynamically constructed for high speed and capable of scanning a spherical section forward thereof to identify targets for destruction. 2. A flush mounted cylindrical array monopulse scanning antenna as set forth in claim 1 wherein said linear phased waveguide arrays each have a double row of slots with one each pair of dielectric slabs therein and one said crystal coupler for each double row of slots of the linear phased array. I 3. A flush mounted cylindrical array monopulse scanning antenna as set forth in claim 2 wherein said master means coupled in co-operation with all said rotation means of said dielectric slabs is a positive mechanical reversible driving means. 4. A flush mounted cylindrical array monopulse scanning antenna as set forth in claim 3 wherein said receiving means includes two inputs, one coupled to each of said feeder rings, each input coupled through a first thruplexer, a phase shifter, and a second thruplexer in common to the inputs of a magic-T, the output of which provides sum and difference signals of a target.

Claims (4)

1. A flush mounted cylindrical array monopulse scanning antenna comprising: a conducting cylinder with two subsystems of linear phased waveguide arrays arranged longitudinally around said cylinder to produce a flush cylindrical monopulse antenna; a waveguide feeder ring on one end of each subarray to feed radio frequency into and out of said array, said feeder ring having a crystal coupler for each linear phased array with all crystal couplers coupled to a switching network to activate one-fourth to one-third of adjacent linear phased arrays in a rotating manner to scan 360* around said cylinder axis; a pair of rotatable dielectric slabs extending through each linear phased arraY with rotation means thereon to rotate same to vary the phase angle and the scan beam over an angle with respect to said cylinder axis; master means in coupled co-operation with all said rotation means of said dielectric slabs to rotate same in synchronism; and transmitting means and receiving means coupled to said waveguide feeder rings, said receiver means having means therein to obtain sum and difference of all target signals scanned by said antenna whereby said antenna is aerodynamically constructed for high speed and capable of scanning a spherical section forward thereof to identify targets for destruction.
2. A flush mounted cylindrical array monopulse scanning antenna as set forth in claim 1 wherein said linear phased waveguide arrays each have a double row of slots with one each pair of dielectric slabs therein and one said crystal coupler for each double row of slots of the linear phased array.
3. A flush mounted cylindrical array monopulse scanning antenna as set forth in claim 2 wherein said master means coupled in co-operation with all said rotation means of said dielectric slabs is a positive mechanical reversible driving means.
4. A flush mounted cylindrical array monopulse scanning antenna as set forth in claim 3 wherein said receiving means includes two inputs, one coupled to each of said feeder rings, each input coupled through a first thruplexer, a phase shifter, and a second thruplexer in common to the inputs of a magic-T, the output of which provides sum and difference signals of a target.
US3699574D 1969-10-16 1969-10-16 Scanned cylindrical array monopulse antenna Expired - Lifetime US3699574A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US86710169A true 1969-10-16 1969-10-16

Publications (1)

Publication Number Publication Date
US3699574A true US3699574A (en) 1972-10-17

Family

ID=25349084

Family Applications (1)

Application Number Title Priority Date Filing Date
US3699574D Expired - Lifetime US3699574A (en) 1969-10-16 1969-10-16 Scanned cylindrical array monopulse antenna

Country Status (1)

Country Link
US (1) US3699574A (en)

Cited By (140)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3833904A (en) * 1973-02-05 1974-09-03 Hughes Aircraft Co Airborne switched array radar system
EP0018878A1 (en) * 1979-04-26 1980-11-12 Thomson-Csf Airborne IFF system having a radar and an interrogation antenna
US4612543A (en) * 1983-05-05 1986-09-16 The United States Of America As Represented By The Secretary Of The Navy Integrated high-gain active radar augmentor
US4716417A (en) * 1985-02-13 1987-12-29 Grumman Aerospace Corporation Aircraft skin antenna
US4779097A (en) * 1985-09-30 1988-10-18 The Boeing Company Segmented phased array antenna system with mechanically movable segments
US4965732A (en) * 1985-11-06 1990-10-23 The Board Of Trustees Of The Leland Stanford Junior University Methods and arrangements for signal reception and parameter estimation
US5359338A (en) * 1989-09-20 1994-10-25 The Boeing Company Linear conformal antenna array for scanning near end-fire in one direction
US5543811A (en) * 1995-02-07 1996-08-06 Loral Aerospace Corp. Triangular pyramid phased array antenna
US6768456B1 (en) 1992-09-11 2004-07-27 Ball Aerospace & Technologies Corp. Electronically agile dual beam antenna system
US6774848B2 (en) * 2001-06-29 2004-08-10 Roke Manor Research Limited Conformal phased array antenna
US20040164899A1 (en) * 2003-02-24 2004-08-26 Networkfab Corporation Direction finding method and system using transmission signature differentiation
US20060192504A1 (en) * 1998-09-07 2006-08-31 Arzhang Ardavan Apparatus for generating focused electromagnetic radiation
US20060220948A1 (en) * 1994-11-08 2006-10-05 Time Domain Corporation Time domain radio transmission system
US20080088520A1 (en) * 2006-06-06 2008-04-17 Thales Cylindrical electronically scanned antenna
US7522095B1 (en) * 2005-07-15 2009-04-21 Lockheed Martin Corporation Polygonal cylinder array antenna
US20090251359A1 (en) * 2008-04-08 2009-10-08 Honeywell International Inc. Antenna system for a micro air vehicle
US20100090897A1 (en) * 2008-07-02 2010-04-15 Taihei Nakada Radar apparatus and method for forming reception beam of the same
US20120133549A1 (en) * 2010-11-29 2012-05-31 Src, Inc. Active Electronically Scanned Array Antenna for Hemispherical Scan Coverage
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
US9467870B2 (en) 2013-11-06 2016-10-11 At&T Intellectual Property I, L.P. Surface-wave communications and methods thereof
US9479266B2 (en) 2013-12-10 2016-10-25 At&T Intellectual Property I, L.P. Quasi-optical coupler
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
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
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
US9520945B2 (en) 2014-10-21 2016-12-13 At&T Intellectual Property I, L.P. Apparatus for providing communication services and methods thereof
US9525210B2 (en) 2014-10-21 2016-12-20 At&T Intellectual Property I, L.P. Guided-wave transmission device with non-fundamental mode propagation and methods for use therewith
US9525524B2 (en) 2013-05-31 2016-12-20 At&T Intellectual Property I, L.P. Remote distributed antenna system
US9531427B2 (en) 2014-11-20 2016-12-27 At&T Intellectual Property I, L.P. Transmission device with mode division multiplexing and methods for use therewith
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
US9577306B2 (en) 2014-10-21 2017-02-21 At&T Intellectual Property I, L.P. Guided-wave transmission device and methods for use therewith
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
US9608692B2 (en) 2015-06-11 2017-03-28 At&T Intellectual Property I, L.P. Repeater and methods for use therewith
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
US9628116B2 (en) 2015-07-14 2017-04-18 At&T Intellectual Property I, L.P. Apparatus and methods for transmitting wireless signals
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
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
US9654173B2 (en) 2014-11-20 2017-05-16 At&T Intellectual Property I, L.P. Apparatus for powering a communication device and methods thereof
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
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
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
US9685992B2 (en) 2014-10-03 2017-06-20 At&T Intellectual Property I, L.P. Circuit panel network and methods thereof
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
US9699785B2 (en) 2012-12-05 2017-07-04 At&T Intellectual Property I, L.P. Backhaul link for distributed antenna system
US9705571B2 (en) 2015-09-16 2017-07-11 At&T Intellectual Property I, L.P. Method and apparatus for use with a radio distributed antenna system
US9705561B2 (en) 2015-04-24 2017-07-11 At&T Intellectual Property I, L.P. Directional coupling device and methods for use therewith
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
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
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
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
US9749053B2 (en) 2015-07-23 2017-08-29 At&T Intellectual Property I, L.P. Node device, repeater 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
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
US9755697B2 (en) 2014-09-15 2017-09-05 At&T Intellectual Property I, L.P. Method and apparatus for sensing a condition in a transmission medium of electromagnetic waves
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
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
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
US9780834B2 (en) 2014-10-21 2017-10-03 At&T Intellectual Property I, L.P. Method and apparatus for transmitting electromagnetic waves
US9793954B2 (en) 2015-04-28 2017-10-17 At&T Intellectual Property I, L.P. Magnetic coupling device and methods for use therewith
US9793955B2 (en) 2015-04-24 2017-10-17 At&T Intellectual Property I, Lp Passive electrical coupling device and methods for use therewith
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
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
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
US9836957B2 (en) 2015-07-14 2017-12-05 At&T Intellectual Property I, L.P. Method and apparatus for communicating with premises equipment
US9838896B1 (en) 2016-12-09 2017-12-05 At&T Intellectual Property I, L.P. Method and apparatus for assessing network coverage
US9847850B2 (en) 2014-10-14 2017-12-19 At&T Intellectual Property I, L.P. Method and apparatus for adjusting a mode of communication in a communication network
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
US9853342B2 (en) 2015-07-14 2017-12-26 At&T Intellectual Property I, L.P. Dielectric transmission medium connector and methods for use therewith
US9860075B1 (en) 2016-08-26 2018-01-02 At&T Intellectual Property I, L.P. Method and communication node for broadband distribution
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
US9866309B2 (en) 2015-06-03 2018-01-09 At&T Intellectual Property I, Lp Host node device and methods for use therewith
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
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
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
US9876571B2 (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
US9876264B2 (en) 2015-10-02 2018-01-23 At&T Intellectual Property I, Lp Communication system, guided wave switch 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
US9882277B2 (en) 2015-10-02 2018-01-30 At&T Intellectual Property I, Lp Communication device and antenna assembly with actuated gimbal mount
US9893795B1 (en) 2016-12-07 2018-02-13 At&T Intellectual Property I, Lp Method and repeater for broadband distribution
US9904535B2 (en) 2015-09-14 2018-02-27 At&T Intellectual Property I, L.P. Method and apparatus for distributing software
US9906269B2 (en) 2014-09-17 2018-02-27 At&T Intellectual Property I, L.P. Monitoring and mitigating conditions in a communication network
US9913139B2 (en) 2015-06-09 2018-03-06 At&T Intellectual Property I, L.P. Signal fingerprinting for authentication of communicating devices
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
US9912027B2 (en) 2015-07-23 2018-03-06 At&T Intellectual Property I, L.P. Method and apparatus for exchanging communication signals
US9912381B2 (en) 2015-06-03 2018-03-06 At&T Intellectual Property I, Lp Network termination and methods 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
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
US9927517B1 (en) 2016-12-06 2018-03-27 At&T Intellectual Property I, L.P. Apparatus and methods for sensing rainfall
US9948333B2 (en) 2015-07-23 2018-04-17 At&T Intellectual Property I, L.P. Method and apparatus for wireless communications to mitigate interference
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
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
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
US9973940B1 (en) 2017-02-27 2018-05-15 At&T Intellectual Property I, L.P. Apparatus and methods for dynamic impedance matching of a guided wave launcher
US9991580B2 (en) 2016-10-21 2018-06-05 At&T Intellectual Property I, L.P. Launcher and coupling system for guided wave mode cancellation
US9998870B1 (en) 2016-12-08 2018-06-12 At&T Intellectual Property I, L.P. Method and apparatus for proximity sensing
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
US9999038B2 (en) 2013-05-31 2018-06-12 At&T Intellectual Property I, L.P. Remote distributed antenna system
US10009065B2 (en) 2012-12-05 2018-06-26 At&T Intellectual Property I, L.P. Backhaul link for distributed antenna system
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
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
US10009067B2 (en) 2014-12-04 2018-06-26 At&T Intellectual Property I, L.P. Method and apparatus for configuring a communication interface
US10020587B2 (en) 2015-07-31 2018-07-10 At&T Intellectual Property I, L.P. Radial antenna 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
US10027397B2 (en) 2016-12-07 2018-07-17 At&T Intellectual Property I, L.P. Distributed antenna system and methods for use therewith
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
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
US10044409B2 (en) 2015-07-14 2018-08-07 At&T Intellectual Property I, L.P. Transmission medium and methods for use therewith
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
US10051483B2 (en) 2015-10-16 2018-08-14 At&T Intellectual Property I, L.P. Method and apparatus for directing wireless signals
US10069535B2 (en) 2016-12-08 2018-09-04 At&T Intellectual Property I, L.P. Apparatus and methods for launching electromagnetic waves having a certain electric field structure
US10074890B2 (en) 2015-10-02 2018-09-11 At&T Intellectual Property I, L.P. Communication device and antenna with integrated light assembly
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
US10090594B2 (en) 2016-11-23 2018-10-02 At&T Intellectual Property I, L.P. Antenna system having structural configurations for assembly
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
US10103801B2 (en) 2015-06-03 2018-10-16 At&T Intellectual Property I, L.P. Host node device and methods for use therewith
US10103422B2 (en) 2016-12-08 2018-10-16 At&T Intellectual Property I, L.P. Method and apparatus for mounting network devices
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
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
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
US10142086B2 (en) 2015-06-11 2018-11-27 At&T Intellectual Property I, L.P. Repeater 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
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
US10148016B2 (en) 2015-07-14 2018-12-04 At&T Intellectual Property I, L.P. Apparatus and methods for communicating utilizing an antenna array
US10154493B2 (en) 2015-06-03 2018-12-11 At&T Intellectual Property I, L.P. Network termination 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
US10170840B2 (en) 2015-07-14 2019-01-01 At&T Intellectual Property I, L.P. Apparatus and methods for sending or receiving electromagnetic signals
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
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
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
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
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
US10243784B2 (en) 2014-11-20 2019-03-26 At&T Intellectual Property I, L.P. System for generating topology information and methods thereof
US10264586B2 (en) 2016-12-09 2019-04-16 At&T Mobility Ii Llc Cloud-based packet controller and methods for use therewith
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
US10291334B2 (en) 2016-11-03 2019-05-14 At&T Intellectual Property I, L.P. System for detecting a fault in a communication system
US10298293B2 (en) 2017-03-13 2019-05-21 At&T Intellectual Property I, L.P. Apparatus of communication utilizing wireless network devices
US10305190B2 (en) 2016-12-01 2019-05-28 At&T Intellectual Property I, L.P. Reflecting dielectric antenna system and methods for use therewith
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
US10320586B2 (en) 2016-10-14 2019-06-11 At&T Intellectual Property I, L.P. Apparatus and methods for generating non-interfering electromagnetic waves on an insulated transmission medium

Cited By (203)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3833904A (en) * 1973-02-05 1974-09-03 Hughes Aircraft Co Airborne switched array radar system
EP0018878A1 (en) * 1979-04-26 1980-11-12 Thomson-Csf Airborne IFF system having a radar and an interrogation antenna
FR2455291A1 (en) * 1979-04-26 1980-11-21 Thomson Csf System interrogator AIRBORNE
US4384290A (en) * 1979-04-26 1983-05-17 Thomson-Csf Airborne interrogation system
US4612543A (en) * 1983-05-05 1986-09-16 The United States Of America As Represented By The Secretary Of The Navy Integrated high-gain active radar augmentor
US4716417A (en) * 1985-02-13 1987-12-29 Grumman Aerospace Corporation Aircraft skin antenna
US4779097A (en) * 1985-09-30 1988-10-18 The Boeing Company Segmented phased array antenna system with mechanically movable segments
US4965732A (en) * 1985-11-06 1990-10-23 The Board Of Trustees Of The Leland Stanford Junior University Methods and arrangements for signal reception and parameter estimation
US5359338A (en) * 1989-09-20 1994-10-25 The Boeing Company Linear conformal antenna array for scanning near end-fire in one direction
US20050012655A1 (en) * 1992-09-11 2005-01-20 Ball Corporation Electronically agile multi-beam antenna system
US6768456B1 (en) 1992-09-11 2004-07-27 Ball Aerospace & Technologies Corp. Electronically agile dual beam antenna system
US6771218B1 (en) * 1992-09-11 2004-08-03 Ball Aerospace & Technologies Corp. Electronically agile multi-beam antenna
US20040263387A1 (en) * 1992-09-11 2004-12-30 Ball Aerospace & Technologies Corp. Electronically agile dual beam antenna system
US20060220948A1 (en) * 1994-11-08 2006-10-05 Time Domain Corporation Time domain radio transmission system
US5543811A (en) * 1995-02-07 1996-08-06 Loral Aerospace Corp. Triangular pyramid phased array antenna
US20060192504A1 (en) * 1998-09-07 2006-08-31 Arzhang Ardavan Apparatus for generating focused electromagnetic radiation
US9633754B2 (en) * 1998-09-07 2017-04-25 Oxbridge Pulsar Sources Limited Apparatus for generating focused electromagnetic radiation
US6774848B2 (en) * 2001-06-29 2004-08-10 Roke Manor Research Limited Conformal phased array antenna
US20040164899A1 (en) * 2003-02-24 2004-08-26 Networkfab Corporation Direction finding method and system using transmission signature differentiation
US7075482B2 (en) * 2003-02-24 2006-07-11 Network Fab Corporation Direction finding method and system using transmission signature differentiation
US7522095B1 (en) * 2005-07-15 2009-04-21 Lockheed Martin Corporation Polygonal cylinder array antenna
US7548212B2 (en) * 2006-06-06 2009-06-16 Thales Cylindrical electronically scanned antenna
US20080088520A1 (en) * 2006-06-06 2008-04-17 Thales Cylindrical electronically scanned antenna
US20090251359A1 (en) * 2008-04-08 2009-10-08 Honeywell International Inc. Antenna system for a micro air vehicle
US7701384B2 (en) * 2008-04-08 2010-04-20 Honeywell International Inc. Antenna system for a micro air vehicle
US8068052B2 (en) * 2008-07-02 2011-11-29 Kabushiki Kaisha Toshiba Radar apparatus and method for forming reception beam of the same
US20100090897A1 (en) * 2008-07-02 2010-04-15 Taihei Nakada Radar apparatus and method for forming reception beam of the same
US20120133549A1 (en) * 2010-11-29 2012-05-31 Src, Inc. Active Electronically Scanned Array Antenna for Hemispherical Scan Coverage
US8547275B2 (en) * 2010-11-29 2013-10-01 Src, Inc. Active electronically scanned array antenna for hemispherical scan coverage
US9788326B2 (en) 2012-12-05 2017-10-10 At&T Intellectual Property I, L.P. Backhaul link for distributed antenna system
US10194437B2 (en) 2012-12-05 2019-01-29 At&T Intellectual Property I, L.P. Backhaul link for distributed antenna system
US9699785B2 (en) 2012-12-05 2017-07-04 At&T Intellectual Property I, L.P. Backhaul link for distributed antenna system
US10009065B2 (en) 2012-12-05 2018-06-26 At&T Intellectual Property I, L.P. Backhaul link for distributed antenna system
US10051630B2 (en) 2013-05-31 2018-08-14 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
US9525524B2 (en) 2013-05-31 2016-12-20 At&T Intellectual Property I, L.P. Remote distributed antenna system
US9930668B2 (en) 2013-05-31 2018-03-27 At&T Intellectual Property I, L.P. Remote distributed antenna system
US10091787B2 (en) 2013-05-31 2018-10-02 At&T Intellectual Property I, L.P. Remote distributed antenna system
US9674711B2 (en) 2013-11-06 2017-06-06 At&T Intellectual Property I, L.P. Surface-wave communications and methods thereof
US9661505B2 (en) 2013-11-06 2017-05-23 At&T Intellectual Property I, L.P. Surface-wave communications and methods thereof
US9467870B2 (en) 2013-11-06 2016-10-11 At&T Intellectual Property I, L.P. Surface-wave communications and methods thereof
US9479266B2 (en) 2013-12-10 2016-10-25 At&T Intellectual Property I, L.P. Quasi-optical coupler
US9876584B2 (en) 2013-12-10 2018-01-23 At&T Intellectual Property I, L.P. Quasi-optical coupler
US9794003B2 (en) 2013-12-10 2017-10-17 At&T Intellectual Property I, L.P. Quasi-optical coupler
US10096881B2 (en) 2014-08-26 2018-10-09 At&T Intellectual Property I, L.P. Guided wave couplers for coupling electromagnetic waves to an outer surface of a transmission medium
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
US9755697B2 (en) 2014-09-15 2017-09-05 At&T Intellectual Property I, L.P. Method and apparatus for sensing a condition in a transmission medium of electromagnetic waves
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
US9906269B2 (en) 2014-09-17 2018-02-27 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
US9973416B2 (en) 2014-10-02 2018-05-15 At&T Intellectual Property I, L.P. Method and apparatus that provides fault tolerance in a communication network
US9998932B2 (en) 2014-10-02 2018-06-12 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
US9866276B2 (en) 2014-10-10 2018-01-09 At&T Intellectual Property I, L.P. Method and apparatus for arranging communication sessions in a communication system
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
US9847850B2 (en) 2014-10-14 2017-12-19 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
US9948355B2 (en) 2014-10-21 2018-04-17 At&T Intellectual Property I, L.P. Apparatus for providing communication services and methods thereof
US9520945B2 (en) 2014-10-21 2016-12-13 At&T Intellectual Property I, L.P. Apparatus for providing communication services and methods thereof
US9954286B2 (en) 2014-10-21 2018-04-24 At&T Intellectual Property I, L.P. Guided-wave transmission device with non-fundamental mode propagation and methods for use therewith
US9960808B2 (en) 2014-10-21 2018-05-01 At&T Intellectual Property I, L.P. Guided-wave transmission device and methods for use therewith
US9705610B2 (en) 2014-10-21 2017-07-11 At&T Intellectual Property I, L.P. Transmission device with impairment compensation and methods for use therewith
US9525210B2 (en) 2014-10-21 2016-12-20 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
US9871558B2 (en) 2014-10-21 2018-01-16 At&T Intellectual Property I, L.P. Guided-wave transmission device 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
US9876587B2 (en) 2014-10-21 2018-01-23 At&T Intellectual Property I, L.P. Transmission device with impairment compensation and methods for use therewith
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
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
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
US9780834B2 (en) 2014-10-21 2017-10-03 At&T Intellectual Property I, L.P. Method and apparatus for transmitting electromagnetic waves
US9596001B2 (en) 2014-10-21 2017-03-14 At&T Intellectual Property I, L.P. Apparatus for providing communication services and methods thereof
US9577307B2 (en) 2014-10-21 2017-02-21 At&T Intellectual Property I, L.P. Guided-wave transmission device and methods for use therewith
US9577306B2 (en) 2014-10-21 2017-02-21 At&T Intellectual Property I, L.P. Guided-wave transmission device and methods for use therewith
US9571209B2 (en) 2014-10-21 2017-02-14 At&T Intellectual Property I, L.P. Transmission device with impairment compensation and methods for use therewith
US9912033B2 (en) 2014-10-21 2018-03-06 At&T Intellectual Property I, Lp Guided wave coupler, coupling module 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
US10243784B2 (en) 2014-11-20 2019-03-26 At&T Intellectual Property I, L.P. System for generating topology information and methods thereof
US9531427B2 (en) 2014-11-20 2016-12-27 At&T Intellectual Property I, L.P. Transmission device with mode division multiplexing and methods for use therewith
US9654173B2 (en) 2014-11-20 2017-05-16 At&T Intellectual Property I, L.P. Apparatus for powering a communication device 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
US9712350B2 (en) 2014-11-20 2017-07-18 At&T Intellectual Property I, L.P. Transmission device with channel equalization and control and methods for use therewith
US9742521B2 (en) 2014-11-20 2017-08-22 At&T Intellectual Property I, L.P. Transmission device with mode division multiplexing and methods for use therewith
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
US9749083B2 (en) 2014-11-20 2017-08-29 At&T Intellectual Property I, L.P. Transmission device with mode division multiplexing and methods for use therewith
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
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
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
US9876571B2 (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
US9793955B2 (en) 2015-04-24 2017-10-17 At&T Intellectual Property I, Lp Passive electrical coupling device and methods for use therewith
US9705561B2 (en) 2015-04-24 2017-07-11 At&T Intellectual Property I, L.P. Directional coupling device and methods for use therewith
US9831912B2 (en) 2015-04-24 2017-11-28 At&T Intellectual Property I, Lp 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
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
US9793954B2 (en) 2015-04-28 2017-10-17 At&T Intellectual Property I, L.P. Magnetic coupling device and methods for use therewith
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
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
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
US9887447B2 (en) 2015-05-14 2018-02-06 At&T Intellectual Property I, L.P. Transmission medium having multiple cores 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
US10103801B2 (en) 2015-06-03 2018-10-16 At&T Intellectual Property I, L.P. Host node device and methods for use therewith
US9967002B2 (en) 2015-06-03 2018-05-08 At&T Intellectual I, Lp Network termination and methods for use therewith
US9935703B2 (en) 2015-06-03 2018-04-03 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
US9912382B2 (en) 2015-06-03 2018-03-06 At&T Intellectual Property I, Lp 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
US10050697B2 (en) 2015-06-03 2018-08-14 At&T Intellectual Property I, L.P. Host 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
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
US9913139B2 (en) 2015-06-09 2018-03-06 At&T Intellectual Property I, L.P. Signal fingerprinting for authentication of communicating devices
US10142010B2 (en) 2015-06-11 2018-11-27 At&T Intellectual Property I, L.P. Repeater and methods for use therewith
US10142086B2 (en) 2015-06-11 2018-11-27 At&T Intellectual Property I, L.P. Repeater and methods for use therewith
US10027398B2 (en) 2015-06-11 2018-07-17 At&T Intellectual Property I, Lp 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
US9882657B2 (en) 2015-06-25 2018-01-30 At&T Intellectual Property I, L.P. Methods and apparatus for inducing a fundamental wave mode 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
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
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
US9787412B2 (en) 2015-06-25 2017-10-10 At&T Intellectual Property I, L.P. Methods and apparatus for inducing a fundamental wave mode on a transmission medium
US10069185B2 (en) 2015-06-25 2018-09-04 At&T Intellectual Property I, L.P. Methods and apparatus for inducing a non-fundamental wave mode on a transmission medium
US10090601B2 (en) 2015-06-25 2018-10-02 At&T Intellectual Property I, L.P. Waveguide system and methods for inducing a non-fundamental wave mode on a transmission medium
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
US9947982B2 (en) 2015-07-14 2018-04-17 At&T Intellectual Property I, Lp Dielectric transmission medium connector 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
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
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
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
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
US9628116B2 (en) 2015-07-14 2017-04-18 At&T Intellectual Property I, L.P. Apparatus and methods for transmitting wireless signals
US10044409B2 (en) 2015-07-14 2018-08-07 At&T Intellectual Property I, L.P. Transmission medium and methods for use therewith
US9853342B2 (en) 2015-07-14 2017-12-26 At&T Intellectual Property I, L.P. Dielectric transmission medium connector and methods for use therewith
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
US9929755B2 (en) 2015-07-14 2018-03-27 At&T Intellectual Property I, L.P. Method and apparatus for coupling an antenna to a device
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
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
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
US9749053B2 (en) 2015-07-23 2017-08-29 At&T Intellectual Property I, L.P. Node device, repeater and methods for use therewith
US9806818B2 (en) 2015-07-23 2017-10-31 At&T Intellectual Property I, Lp Node device, repeater 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
US9948333B2 (en) 2015-07-23 2018-04-17 At&T Intellectual Property I, L.P. Method and apparatus for wireless communications to mitigate interference
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
US10074886B2 (en) 2015-07-23 2018-09-11 At&T Intellectual Property I, L.P. Dielectric transmission medium comprising a plurality of rigid dielectric members coupled together in a ball and socket configuration
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
US10020587B2 (en) 2015-07-31 2018-07-10 At&T Intellectual Property I, L.P. Radial antenna 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
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
US9838078B2 (en) 2015-07-31 2017-12-05 At&T Intellectual Property I, L.P. Method and apparatus for exchanging communication signals
US9904535B2 (en) 2015-09-14 2018-02-27 At&T Intellectual Property I, L.P. Method and apparatus for distributing software
US10225842B2 (en) 2015-09-16 2019-03-05 At&T Intellectual Property I, L.P. Method, device and storage medium for communications using a modulated signal and a reference signal
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
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
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
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
US9705571B2 (en) 2015-09-16 2017-07-11 At&T Intellectual Property I, L.P. Method and apparatus for use with a radio distributed antenna system
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
US9882277B2 (en) 2015-10-02 2018-01-30 At&T Intellectual Property I, Lp Communication device and antenna assembly with actuated gimbal mount
US10224590B2 (en) 2015-10-02 2019-03-05 At&T Intellectual Property I, L.P. Communication system, guided wave switch and methods for use therewith
US9876264B2 (en) 2015-10-02 2018-01-23 At&T Intellectual Property I, Lp Communication system, guided wave switch and methods for use therewith
US10074890B2 (en) 2015-10-02 2018-09-11 At&T Intellectual Property I, L.P. Communication device and antenna with integrated light assembly
US10051483B2 (en) 2015-10-16 2018-08-14 At&T Intellectual Property I, L.P. Method and apparatus for directing wireless signals
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
US10320586B2 (en) 2016-10-14 2019-06-11 At&T Intellectual Property I, L.P. Apparatus and methods for generating non-interfering electromagnetic waves on an insulated transmission medium
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
US9991580B2 (en) 2016-10-21 2018-06-05 At&T Intellectual Property I, L.P. Launcher and coupling system for guided wave mode cancellation
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
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
US10291334B2 (en) 2016-11-03 2019-05-14 At&T Intellectual Property I, L.P. System for detecting a fault in a communication system
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
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
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
US10090594B2 (en) 2016-11-23 2018-10-02 At&T Intellectual Property I, L.P. Antenna system having structural configurations for assembly
US10305190B2 (en) 2016-12-01 2019-05-28 At&T Intellectual Property I, L.P. Reflecting dielectric antenna system 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
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
US9927517B1 (en) 2016-12-06 2018-03-27 At&T Intellectual Property I, L.P. Apparatus and methods for sensing rainfall
US10027397B2 (en) 2016-12-07 2018-07-17 At&T Intellectual Property I, L.P. Distributed 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
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
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
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
US10103422B2 (en) 2016-12-08 2018-10-16 At&T Intellectual Property I, L.P. Method and apparatus for mounting network devices
US9998870B1 (en) 2016-12-08 2018-06-12 At&T Intellectual Property I, L.P. Method and apparatus for proximity sensing
US10069535B2 (en) 2016-12-08 2018-09-04 At&T Intellectual Property I, L.P. Apparatus and methods for launching electromagnetic waves having a certain electric field structure
US9838896B1 (en) 2016-12-09 2017-12-05 At&T Intellectual Property I, L.P. Method and apparatus for assessing network coverage
US10264586B2 (en) 2016-12-09 2019-04-16 At&T Mobility Ii Llc Cloud-based packet controller and methods for use therewith
US9973940B1 (en) 2017-02-27 2018-05-15 At&T Intellectual Property I, L.P. Apparatus and methods for dynamic impedance matching of a guided wave launcher
US10298293B2 (en) 2017-03-13 2019-05-21 At&T Intellectual Property I, L.P. Apparatus of communication utilizing wireless network devices

Similar Documents

Publication Publication Date Title
US3413637A (en) Multifunction antenna having selective radiation patterns
US3328800A (en) Slot antenna utilizing variable standing wave pattern for controlling slot excitation
US3295134A (en) Antenna system for radiating directional patterns
US3245081A (en) Multiple feed wide angle antenna utilizing biconcave spherical delay lens
US3305867A (en) Antenna array system
US6100846A (en) Fixed patch array scanning antenna
US3453617A (en) Switchable linear-circular polarized monopulse radar feed producing two axis (three-dimensional tracking) information utilizing a two-lobe monopulse design
US6771218B1 (en) Electronically agile multi-beam antenna
US5561434A (en) Dual band phased array antenna apparatus having compact hardware
US5189433A (en) Slotted microstrip electronic scan antenna
US6741208B1 (en) Dual-mode switched aperture/weather radar antenna array feed
US5583511A (en) Stepped beam active array antenna and radar system employing same
CA1046631A (en) Multimode horn antenna
EP0690315A2 (en) RF sensor and radar for automotive speed and collision avoidance applications
US5917442A (en) Missile guidance system
US3500422A (en) Sub-array horn assembly for phased array application
US6211836B1 (en) Scanning antenna including a dielectric waveguide and a rotatable cylinder coupled thereto
US4053895A (en) Electronically scanned microstrip antenna array
US3925784A (en) Antenna arrays of internally phased elements
US5389939A (en) Ultra wideband phased array antenna
US4041501A (en) Limited scan array antenna systems with sharp cutoff of element pattern
JP3287309B2 (en) Directional coupler, an antenna device and a transceiver device
US4458250A (en) 360-Degree scanning antenna with cylindrical array of slotted waveguides
US3665481A (en) Multi-purpose antenna employing dish reflector with plural coaxial horn feeds
EP1742081A2 (en) Digital beamforming for an electronically scanned radar system