US3922621A - 6-Port directional orthogonal mode transducer having corrugated waveguide coupling for transmit/receive isolation - Google Patents

6-Port directional orthogonal mode transducer having corrugated waveguide coupling for transmit/receive isolation Download PDF

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US3922621A
US3922621A US476028A US47602874A US3922621A US 3922621 A US3922621 A US 3922621A US 476028 A US476028 A US 476028A US 47602874 A US47602874 A US 47602874A US 3922621 A US3922621 A US 3922621A
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waveguide
signal
transmit
corrugations
transducer
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Robert Walter Gruner
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Comsat Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/02—Waveguide horns
    • H01Q13/025—Multimode horn antennas; Horns using higher mode of propagation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/16—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion
    • H01P1/161—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion sustaining two independent orthogonal modes, e.g. orthomode transducer
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements

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  • a directional orthogonal mode transducer has an inner, circular waveguide for propagating 6 GHz transmit signals and an outer, circular, coaxial waveguide for propagating 4 GHZ receive signals.
  • the terminal end of the outer waveguide is joined to an enlarged. cylindrical coupling section provided with a plurality of spaced, inwardly projecting corrugations in the form of washerlike annular rings.
  • the corrugations when properly dimensioned, establish surface reactance conditions that result in an inner, circular field distribution at the transmit frequency and a surrounding, annular field distribution at the receive frequency. This effectively decouples or isolates the transmit and receive signals whereby they are separately propagated in their respective waveguides,
  • This invention relates to a directional orthogonal mode transducer having a corrugated waveguide coupling section to implement the separation of the transmit and receive signals between two separate, coaxial waveguide systems.
  • a dielectric rod configuration has also been proposed to implement waveguide coupling, but is difficult to meet the severe requirements of mechanical symmetry when using dielectric materials necessary to suppress higher order mode generation.
  • the elemination of higher order modes is mandatory to obtain a high degree of polarization isolation.
  • the 6-port directional orthogonal mode transducer of the present invention functions in the dual-polarized transmit and dual-polarized receive modes, and provides inherent transmit-to-receive isolation by virtue of the reactive nature of its combining junction. It may be used in both earth stations and spacecraft or satellite antenna systems. In linear polarization it allows for independent control of the two orthogonal transmit polarizations with respect to the two orthogonal receive polarizations. It employs separate, coaxial waveguide systems which allow optimum narrow band polarizers to be used, greatly improving the polarization isolation in the dual circularly-polarized mode of operation.
  • the instant transducer comprises an inner. circular waveguide for propagating a transmit signal, and an outer, circular. coaxial waveguide for propagating a lower frequency receive signal between its inner surface and the outer surface of the inner waveguide.
  • this coupling section Within this coupling section are mounted a plurality of spaced, inwardly projecting. annular rings. generically referred to in the art as corrugations.
  • the depth of the corrugations is less than M4 of the receive signal and greater than M4 of 2 the transmit signal, and the spacing between them is less than N2 of the transmit signal.
  • the effect of these corrugations is to establish a surface reactance condition that changes from inductive to capacitive causing a phase shift between the lowest order symmetric modes in the transmit and receive signals.
  • the reactive effect of the corrugations renders the TE and TM u modes out of phase at the lower receive frequency and the electric field pattern that results from their vector additon is an annular ring of energy, with a void in the middle, that couples to the outer, coaxial waveguide.
  • the TE and TM modes are in phase at the higher transmit frequency, and their resultant field pattern is a central circle of energy, surrounded by a void annular ring, that couples to the inner, circular waveguide.
  • FIG. 1 shows a perspective view, partly in cutaway, of a directional orthogonal mode transducer constructed in accordance with the teachings of the present invention
  • FIG. 2 shows a sectional view of the transducer of FIG. 1 taken along lines 2-2,
  • FIG. 3 shows a sectional view of a corrugated waveguide structure which will be used in analyzing the operation of the present invention
  • FIG. 4 shows an end view of the waveguide structure of FIG. 3,
  • FIG. 5 shows simplified electric field distribution diagrams illustrating the vectorial addition of the out of phase TE and TM modes in the waveguide structure of FIG. 3, and
  • FIG. 6 shows diagrams similar to those of FIG. 5 but illustrating the addition of the in phase TE, and TM modes.
  • a corrugated structure as shown in FIGS. 3 and 4 is constructed by a sequential placement of annular ring or washer-like irises 10 in a circular waveguide 12.
  • Such a corrugated structure may be analyzed by a number of methods varying from mathematically involved treatments such as hybridmode analysis to simple circuit representations of the shunt and series reactances of the sequential irises.
  • the two lowest order symmetric modes in a circular waveguide, the TE and TM modes will be used to approximate the field distributions that exist in the corrugated waveguide of FIGS. 3 and 4. For example, if the corrugation depth D in FIG.
  • the resultant electric field may be synthesized as an out-of-phase addition of the TE and TM modes. This is shown in FIG. 5. This is similar to the electric field distribution one would expect from a dielectric cylinder mounted just inside the waveguide wall.
  • the central portions of the TE field are opposed and cancelled by the central portions of the TM,, field, leaving a central void as shown in the resultant field diagram to the right of the equal sign.
  • the peripheral portions of the respective fields are similarly oriented in a directional sense and reinforce one another, resulting in an annular ring of energy surrounding the central void.
  • the resultant field may be synthesized as an iii-phase addition of the Tli and TM modes, shown in FIG, 6.
  • the central portions of the TE, and TM fields are now similarly oriented and reinforce each other to produce a central core of energy as seen in the resultant field diagram on the right side of FIG, 6.
  • the peripheral portions of the respective fields are opposed to and cancel each other, leaving a void annular ring surrounding the central core of en ergy.
  • the transducer comprises an inner, circular waveguide 14 surrounded by an outer. coaxial waveguide 16.
  • the two waveguides are coupled by a rotational joint 18 to enable Faraday effect compensation.
  • the inner waveguide 14 is used to propagate a transmit signal of approximately 6 (1H2, and is provided with direct and shunt coupled input ports 20, 22, respectively.
  • the outer waveguide 16 is used to propagate a receive signal of approximately 4 GHZ, and is provided with orthogonal, shunt coupled output ports 24, 26.
  • the size of the inner waveguide 14 is selected to be below cutoff in the 4 GHZ receive band.
  • a coupling section 28 of larger diameter than the outer waveguide 16 is secured to a terminal end of the latter. and is provided with a plurality of corrugations in the form of annular, washer-like rings 30.
  • the depth of the corrugations is chosen to be less than M4 of the 4 GHZ receive signal and greater than M4 of the 6 GHz transmit signal, and the spacing between the corrugations is less than )t/Z of the transmit signal,
  • the transducer is completed by a circular, terminal waveguide section 32 secured to the other end ofthe coupling section 28.
  • the section 32 is of equal diameter to the outer waveguide 16, and defines the overall input and output ports of the transducer,
  • the surface rcactance effect of the corrugations 30, given the specified depth and spacing parameters, produces the resultant electric field distribution patterns for the 4 GHz receive and 6 GHZ transmit signals shown in FIGS. and 6, respectively.
  • These field distributions are synthesized from the TM mode being out-of-phase with the TE mode at the receive frequency and inphase with the TE mode at the transmit frequency, as previously discussed It can he intuitively seen that the annular ring pattern of FIG. 5 will efficiently couple to the outer, coaxial waveguide 16 of HG. I, while the central core pattern of FIG. 6 will siniilariy couple to the circular. inner waveguide 14. The net result is a very effective and complete degree of isolation between the transmit and receive signals, both propagated through the same overall, structurally simple transducer.
  • the transducer is structurally configured in circular crossscction waveguides, it could equally well be implemented in square cross-section waveguides.
  • the corrugations could be defined by patterns of inwardly projecting rods, screws or teeth, as is ltnown in the art, From a fabrication standpoint however, the circular geometry and the annular ring corrugation lorin disclosed are to be preferred,
  • an improved signal coupling section comprising:
  • a a cylindrical waveguide axially aligned with and attached to one end of the outer waveguide and having a diameter greater than that of the outer waveguide
  • corrugations spaced around the inner periphery of the cylindrical waveguide, said corrugations being dimensioned and configured to produce, by reason of their surface rcactance effect, resultant electric field distribution patterns in the form of a central core of energy with a surrounding, void annular ring for the first signal, and an annular ring of en ergy with a central void for the second signal, whereby the first and second signals are substantially isolated from each other with the first signal coupling to the inner waveguide and the second signal coupling to the outer waveguide,

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  • Electromagnetism (AREA)
  • Waveguide Aerials (AREA)

Abstract

A directional orthogonal mode transducer has an inner, circular waveguide for propagating 6 GHz transmit signals and an outer, circular, coaxial waveguide for propagating 4 GHz receive signals. The terminal end of the outer waveguide is joined to an enlarged, cylindrical coupling section provided with a plurality of spaced, inwardly projecting corrugations in the form of washer-like annular rings. The corrugations, when properly dimensioned, establish surface reactance conditions that result in an inner, circular field distribution at the transmit frequency and a surrounding, annular field distribution at the receive frequency. This effectively decouples or isolates the transmit and receive signals whereby they are separately propagated in their respective waveguides.

Description

United States Patent Gruner 1 1 Nov. 25, 1975 [75} Inventor: Robert Walter Gruner,
Gaithersburg, Md,
[73] Assignee: Communication Satellite Corporation, Washington, DC.
[22] Filed: June 3, 1974 [2]] Appl. No.: 476,028
{52] US. Cl. 333/11; 333/21 R; 333/98 M [51] Int. Cl 1101p 1/16; HOlp 5/12 [58] Field 01 Search. 333/21 R, 21 A, 98 R, 98 M, 333/6, 11;343/180, 175, 777, 778, 786, 852, 858', 325/21, 24
[56] References Cited UNITED STATES PATENTS 3,413,642 11/1968 Cook 333/21 R X 3,665,481 5/1972 Low et al 343/777 X 3,772,619 11/1973 Clarricoats 333/21 R X Primary Examiner-Paul L. Gensler Attorney, Agent, or Firm-Sughrue, Rothwell, Mion,
Zinn 8L Macpeak [57] ABSTRACT A directional orthogonal mode transducer has an inner, circular waveguide for propagating 6 GHz transmit signals and an outer, circular, coaxial waveguide for propagating 4 GHZ receive signals. The terminal end of the outer waveguide is joined to an enlarged. cylindrical coupling section provided with a plurality of spaced, inwardly projecting corrugations in the form of washerlike annular rings. The corrugations, when properly dimensioned, establish surface reactance conditions that result in an inner, circular field distribution at the transmit frequency and a surrounding, annular field distribution at the receive frequency. This effectively decouples or isolates the transmit and receive signals whereby they are separately propagated in their respective waveguides,
3 Claims, 6 Drawing Figures RESULT/1N1 f I /I i ii I 1 I] I) J t u RESULT/1N1 US. Patent Nov. 25, 1975 3,922,621
I] \4 1 5 D RESULTANT 1 i z x f a I l I I a RESULTANT 6-PORT DIRECTIONAL ORTHOGONAL MODE TRANSDUCER HAVING CORRUGATED WAVEGUIDE COUPLING FOR TRANSMIT/RECEIVE ISOLATION BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a directional orthogonal mode transducer having a corrugated waveguide coupling section to implement the separation of the transmit and receive signals between two separate, coaxial waveguide systems.
2. Description of the Prior Art In certain satellite communications systems it is desirable to reuse frequencies on orthogonal polarizations. Only two previous approaches to satisfy this requirement are known. The first is based on a wide-band 4-port orthogonal mode transducer design where transmit and receive signals appear at all ports. This approach has the disadvantage that transmit and receive signals must be separated by reactive diplexing. Furthermore, independent control of transmit and receive polarizations can be achieved only with the addition of external variable coupling circuits, and the addition of such variable coupling circuits will generally degrade polarization orthogonality. The second approach is based on designing a directional junction, but the directional property of the junction is realized with two balanced pairs of multihole directional couplers. This main disadvantage with this design is its inherent mechanical complexity, particularly in view of the very severe requirements on balancing or symmetry.
A dielectric rod configuration has also been proposed to implement waveguide coupling, but is difficult to meet the severe requirements of mechanical symmetry when using dielectric materials necessary to suppress higher order mode generation. The elemination of higher order modes is mandatory to obtain a high degree of polarization isolation.
SUMMARY OF THE INVENTION The 6-port directional orthogonal mode transducer of the present invention functions in the dual-polarized transmit and dual-polarized receive modes, and provides inherent transmit-to-receive isolation by virtue of the reactive nature of its combining junction. It may be used in both earth stations and spacecraft or satellite antenna systems. In linear polarization it allows for independent control of the two orthogonal transmit polarizations with respect to the two orthogonal receive polarizations. It employs separate, coaxial waveguide systems which allow optimum narrow band polarizers to be used, greatly improving the polarization isolation in the dual circularly-polarized mode of operation.
structurally, the instant transducer comprises an inner. circular waveguide for propagating a transmit signal, and an outer, circular. coaxial waveguide for propagating a lower frequency receive signal between its inner surface and the outer surface of the inner waveguide. Adjacent the terminal end of the inner waveguide an enlarged, cylindrical coupling section is secured to the outer waveguide. Within this coupling section are mounted a plurality of spaced, inwardly projecting. annular rings. generically referred to in the art as corrugations. The depth of the corrugations is less than M4 of the receive signal and greater than M4 of 2 the transmit signal, and the spacing between them is less than N2 of the transmit signal.
The effect of these corrugations is to establish a surface reactance condition that changes from inductive to capacitive causing a phase shift between the lowest order symmetric modes in the transmit and receive signals. Stated another way, the reactive effect of the corrugations renders the TE and TM u modes out of phase at the lower receive frequency and the electric field pattern that results from their vector additon is an annular ring of energy, with a void in the middle, that couples to the outer, coaxial waveguide. Conversely, the TE and TM modes are in phase at the higher transmit frequency, and their resultant field pattern is a central circle of energy, surrounded by a void annular ring, that couples to the inner, circular waveguide.
BRIEF DESCRIPTION OF THE DRAWINGS In the drawings:
FIG. 1 shows a perspective view, partly in cutaway, of a directional orthogonal mode transducer constructed in accordance with the teachings of the present invention,
FIG. 2 shows a sectional view of the transducer of FIG. 1 taken along lines 2-2,
FIG. 3 shows a sectional view of a corrugated waveguide structure which will be used in analyzing the operation of the present invention,
FIG. 4 shows an end view of the waveguide structure of FIG. 3,
FIG. 5 shows simplified electric field distribution diagrams illustrating the vectorial addition of the out of phase TE and TM modes in the waveguide structure of FIG. 3, and
FIG. 6 shows diagrams similar to those of FIG. 5 but illustrating the addition of the in phase TE, and TM modes.
DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawings, a corrugated structure as shown in FIGS. 3 and 4 is constructed by a sequential placement of annular ring or washer-like irises 10 in a circular waveguide 12. Such a corrugated structure may be analyzed by a number of methods varying from mathematically involved treatments such as hybridmode analysis to simple circuit representations of the shunt and series reactances of the sequential irises. For purposes of a simplified analysis herein, the two lowest order symmetric modes in a circular waveguide, the TE and TM modes, will be used to approximate the field distributions that exist in the corrugated waveguide of FIGS. 3 and 4. For example, if the corrugation depth D in FIG. 4 is less than /i of the wavelength of the propagated signal, the resultant electric field may be synthesized as an out-of-phase addition of the TE and TM modes. This is shown in FIG. 5. This is similar to the electric field distribution one would expect from a dielectric cylinder mounted just inside the waveguide wall.
As may be clearly seen, the central portions of the TE field are opposed and cancelled by the central portions of the TM,, field, leaving a central void as shown in the resultant field diagram to the right of the equal sign. At the same time. the peripheral portions of the respective fields are similarly oriented in a directional sense and reinforce one another, resulting in an annular ring of energy surrounding the central void.
Conversely, when the corrugation depth D exceeds A of the wavelength of the propagated signal, the resultant field may be synthesized as an iii-phase addition of the Tli and TM modes, shown in FIG, 6. Essen tially, the central portions of the TE, and TM fields are now similarly oriented and reinforce each other to produce a central core of energy as seen in the resultant field diagram on the right side of FIG, 6. At the same time, the peripheral portions of the respective fields are opposed to and cancel each other, leaving a void annular ring surrounding the central core of en ergy.
This simple modal synthesis was applied to the design of the 6-port directional orthogonal mode transducer of the present invention shown in FlGS, l and 2, which will now he described in greater detail. The transducer comprises an inner, circular waveguide 14 surrounded by an outer. coaxial waveguide 16. The two waveguides are coupled by a rotational joint 18 to enable Faraday effect compensation. The inner waveguide 14 is used to propagate a transmit signal of approximately 6 (1H2, and is provided with direct and shunt coupled input ports 20, 22, respectively. The outer waveguide 16 is used to propagate a receive signal of approximately 4 GHZ, and is provided with orthogonal, shunt coupled output ports 24, 26. The size of the inner waveguide 14 is selected to be below cutoff in the 4 GHZ receive band.
A coupling section 28 of larger diameter than the outer waveguide 16 is secured to a terminal end of the latter. and is provided with a plurality of corrugations in the form of annular, washer-like rings 30. The depth of the corrugations is chosen to be less than M4 of the 4 GHZ receive signal and greater than M4 of the 6 GHz transmit signal, and the spacing between the corrugations is less than )t/Z of the transmit signal, The transducer is completed by a circular, terminal waveguide section 32 secured to the other end ofthe coupling section 28. The section 32 is of equal diameter to the outer waveguide 16, and defines the overall input and output ports of the transducer,
As developed above, the surface rcactance effect of the corrugations 30, given the specified depth and spacing parameters, produces the resultant electric field distribution patterns for the 4 GHz receive and 6 GHZ transmit signals shown in FIGS. and 6, respectively. These field distributions are synthesized from the TM mode being out-of-phase with the TE mode at the receive frequency and inphase with the TE mode at the transmit frequency, as previously discussed It can he intuitively seen that the annular ring pattern of FIG. 5 will efficiently couple to the outer, coaxial waveguide 16 of HG. I, while the central core pattern of FIG. 6 will siniilariy couple to the circular. inner waveguide 14. The net result is a very effective and complete degree of isolation between the transmit and receive signals, both propagated through the same overall, structurally simple transducer.
While in the foregoing description the transducer is structurally configured in circular crossscction waveguides, it could equally well be implemented in square cross-section waveguides. Further, the corrugations could be defined by patterns of inwardly projecting rods, screws or teeth, as is ltnown in the art, From a fabrication standpoint however, the circular geometry and the annular ring corrugation lorin disclosed are to be preferred,
What is claimed is:
1. In a directional orthogonal mode transducer including an inner, circular waveguide for propagating a first signal and a surrounding, outer, coaxial waveguide for propagating a second signal having a lower fre quency than the first signal, an improved signal coupling section comprising:
a a cylindrical waveguide axially aligned with and attached to one end of the outer waveguide and having a diameter greater than that of the outer waveguide, and
b a plurality of inwardly projecting corrugations spaced around the inner periphery of the cylindrical waveguide, said corrugations being dimensioned and configured to produce, by reason of their surface rcactance effect, resultant electric field distribution patterns in the form of a central core of energy with a surrounding, void annular ring for the first signal, and an annular ring of en ergy with a central void for the second signal, whereby the first and second signals are substantially isolated from each other with the first signal coupling to the inner waveguide and the second signal coupling to the outer waveguide,
2. A transducer as defined in claim 1 wherein the cor rugations are annular, washer-like rings.
3. A transducer as defined in claim 2 wherein the depth of each ring is less than /2 the wavelength of the second signal and greater than A the wavelength of the first signal, and the spacing between the rings is less than vs the wavelength of the first signal

Claims (3)

1. In a directional orthogonal mode transducer including an inner, circular waveguide for propagating a first signal and a surrounding, outer, coaxial waveguide for propagating a second signal having a lower frequency than the first signal, an improved signal coupling section comprising: a. a cylindrical waveguide axially aligned with and attached to one end of the outer waveguide and having a diamEter greater than that of the outer waveguide, and b. a plurality of inwardly projecting corrugations spaced around the inner periphery of the cylindrical waveguide, said corrugations being dimensioned and configured to produce, by reason of their surface reactance effect, resultant electric field distribution patterns in the form of a central core of energy with a surrounding, void annular ring for the first signal, and an annular ring of energy with a central void for the second signal, whereby the first and second signals are substantially isolated from each other with the first signal coupling to the inner waveguide and the second signal coupling to the outer waveguide.
2. A transducer as defined in claim 1 wherein the corrugations are annular, washer-like rings.
3. A transducer as defined in claim 2 wherein the depth of each ring is less than 1/4 the wavelength of the second signal and greater than 1/4 the wavelength of the first signal, and the spacing between the rings is less than 1/2 the wavelength of the first signal.
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Cited By (22)

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US4048592A (en) * 1975-02-28 1977-09-13 Thomson-Csf Arrangement for extracting divergence-measuring modes from a corrugated guide and tracking antenna incorporating same
FR2524209A1 (en) * 1982-03-25 1983-09-30 Italiana Esercizio Telefon WAVEGUIDED DEVICE CAPABLE OF SEPARATING DUAL BAND AND DUAL POLARIZATION RADIO FREQUENCY SIGNALS
EP0096461A2 (en) * 1982-06-04 1983-12-21 Andrew A.G. Microwave systems
US4558290A (en) * 1984-04-11 1985-12-10 The United States Of America As Represented By The Secretary Of The Air Force Compact broadband rectangular to coaxial waveguide junction
US4566012A (en) * 1982-12-30 1986-01-21 Ford Aerospace & Communications Corporation Wide-band microwave signal coupler
US4777457A (en) * 1983-10-25 1988-10-11 Telecomunicacoes Brasileiras S/A - Telebras Directional coupler for separation of signals in two frequency bands while preserving their polarization characteristics
US5003321A (en) * 1985-09-09 1991-03-26 Sts Enterprises, Inc. Dual frequency feed
US5162808A (en) * 1990-12-18 1992-11-10 Prodelin Corporation Antenna feed with selectable relative polarization
US5305001A (en) * 1992-06-29 1994-04-19 Hughes Aircraft Company Horn radiator assembly with stepped septum polarizer
US6005528A (en) * 1995-03-01 1999-12-21 Raytheon Company Dual band feed with integrated mode transducer
US6577207B2 (en) 2001-10-05 2003-06-10 Lockheed Martin Corporation Dual-band electromagnetic coupler
US6661309B2 (en) * 2001-10-22 2003-12-09 Victory Industrial Corporation Multiple-channel feed network
US6727776B2 (en) 2001-02-09 2004-04-27 Sarnoff Corporation Device for propagating radio frequency signals in planar circuits
US20090251233A1 (en) * 2008-04-04 2009-10-08 Mahon John P Ortho-Mode Transducer for Coaxial Waveguide
US20100214042A1 (en) * 2008-12-19 2010-08-26 Das Nirod K Free-space waveguides, including an array of capacitively loaded conducting ring elements, for guiding a signal through free space
US20110037534A1 (en) * 2008-04-04 2011-02-17 Espino Cynthia P Ortho-Mode Transducer With TEM Probe for Coaxial Waveguide
EP2363912A1 (en) 2010-03-04 2011-09-07 Astrium GmbH Diplexer for a reflector antenna
EP2722926A3 (en) * 2012-10-17 2014-09-10 Honeywell International Inc. Waveguide-configuration adapters
JP2015082759A (en) * 2013-10-23 2015-04-27 三菱電機株式会社 Polarized-wave separation circuit
US9136577B2 (en) 2010-06-08 2015-09-15 National Research Council Of Canada Orthomode transducer
DE102015218877A1 (en) 2015-09-30 2017-03-30 Airbus Ds Gmbh Coaxial diplexer and signal coupling device
EP3561949A1 (en) * 2018-04-27 2019-10-30 Nokia Shanghai Bell Co., Ltd. Multiband antenna feed

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US3665481A (en) * 1970-05-12 1972-05-23 Nasa Multi-purpose antenna employing dish reflector with plural coaxial horn feeds
US3772619A (en) * 1971-06-04 1973-11-13 Andrew Corp Low-loss waveguide transmission

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US3413642A (en) * 1966-05-05 1968-11-26 Bell Telephone Labor Inc Dual mode antenna
US3665481A (en) * 1970-05-12 1972-05-23 Nasa Multi-purpose antenna employing dish reflector with plural coaxial horn feeds
US3772619A (en) * 1971-06-04 1973-11-13 Andrew Corp Low-loss waveguide transmission

Cited By (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4048592A (en) * 1975-02-28 1977-09-13 Thomson-Csf Arrangement for extracting divergence-measuring modes from a corrugated guide and tracking antenna incorporating same
FR2524209A1 (en) * 1982-03-25 1983-09-30 Italiana Esercizio Telefon WAVEGUIDED DEVICE CAPABLE OF SEPARATING DUAL BAND AND DUAL POLARIZATION RADIO FREQUENCY SIGNALS
EP0096461A2 (en) * 1982-06-04 1983-12-21 Andrew A.G. Microwave systems
EP0096461A3 (en) * 1982-06-04 1986-03-12 Andrew Corporation Microwave systems
US4566012A (en) * 1982-12-30 1986-01-21 Ford Aerospace & Communications Corporation Wide-band microwave signal coupler
US4777457A (en) * 1983-10-25 1988-10-11 Telecomunicacoes Brasileiras S/A - Telebras Directional coupler for separation of signals in two frequency bands while preserving their polarization characteristics
US4558290A (en) * 1984-04-11 1985-12-10 The United States Of America As Represented By The Secretary Of The Air Force Compact broadband rectangular to coaxial waveguide junction
US5003321A (en) * 1985-09-09 1991-03-26 Sts Enterprises, Inc. Dual frequency feed
US5162808A (en) * 1990-12-18 1992-11-10 Prodelin Corporation Antenna feed with selectable relative polarization
US5305001A (en) * 1992-06-29 1994-04-19 Hughes Aircraft Company Horn radiator assembly with stepped septum polarizer
US6005528A (en) * 1995-03-01 1999-12-21 Raytheon Company Dual band feed with integrated mode transducer
US6727776B2 (en) 2001-02-09 2004-04-27 Sarnoff Corporation Device for propagating radio frequency signals in planar circuits
US6577207B2 (en) 2001-10-05 2003-06-10 Lockheed Martin Corporation Dual-band electromagnetic coupler
US6661309B2 (en) * 2001-10-22 2003-12-09 Victory Industrial Corporation Multiple-channel feed network
US20040140864A1 (en) * 2001-10-22 2004-07-22 Chen Ming Hui Multiple-channel feed network with integrated die cast structure
US20090251233A1 (en) * 2008-04-04 2009-10-08 Mahon John P Ortho-Mode Transducer for Coaxial Waveguide
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