GB1280841A - Feed system - Google Patents
Feed systemInfo
- Publication number
- GB1280841A GB1280841A GB40621/69A GB4062169A GB1280841A GB 1280841 A GB1280841 A GB 1280841A GB 40621/69 A GB40621/69 A GB 40621/69A GB 4062169 A GB4062169 A GB 4062169A GB 1280841 A GB1280841 A GB 1280841A
- Authority
- GB
- United Kingdom
- Prior art keywords
- port
- mode
- ports
- coupled
- signals
- 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
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
- H01Q25/04—Multimode antennas
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/42—Simultaneous measurement of distance and other co-ordinates
- G01S13/44—Monopulse radar, i.e. simultaneous lobing
- G01S13/4409—HF sub-systems particularly adapted therefor, e.g. circuits for signal combination
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
- G01S3/14—Systems for determining direction or deviation from predetermined direction
- G01S3/146—Systems for determining direction or deviation from predetermined direction by comparing linear polarisation components
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Waveguide Aerials (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Waveguide Switches, Polarizers, And Phase Shifters (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
1280841 Aerials; radio direction-finding RCA CORPORATION 14 Aug 1969 [21 Aug 1968] 40621/69 Headings H4A and H4D [Also in Division H1] In a monopulse multimode feed system a first plurality of waveguide modes is provided by first means coupled to a sum mode port of a mode coupler 16, Fig. 1, and a second plurality of waveguide modes is provided by second means coupled to a plurality of difference mode ports of said coupler, the modes of said second plurality being circularly polarized. Third means, including a single aperture radiating horn 18, is coupled to another port of said coupler. As described, the mode coupler 16, Fig. 2 (an end view), has a large conically shaped port 25 at the centre of a square waveguide section and includes eight symmetrically located waveguide ports 26 to 33 in corner pairs forming four circularly polarized exciting sub-apertures, with each port being orthogonally polarized with respect to its corner paired port. The centre port 25 increases in diameter from its end 34 near the receiver equipment to its end 35 near the horn 18. There is a step between the larger end of the port 25 and the square waveguide section for exciting modes higher than the fundamental. Propagation of unwanted modes is prevented by an inner ring 37 in the port 25 and by tuning stubs 40 in the ports 26 to 33. The horn 18 has an increased flare angle at its end and is provided with internal fins along its four sides, and square waveguide sections inside its corners, to improve bandwidth (Fig. 7, not shown). A mode filter 17, in series between the horn 18 and the mode coupler 16, has a square cross-section, a half cosine function profile along the axis of propagation, and symmetrically located ridges in its two main planes (Figs. 5, 6, not shown). The minimum width of the square aperture at the larger end of the mode filter, and the length of said mode filter are, respectively, 2# and 5#, where #=wavelength corresponding to the geometrical mean of the limits of the operating frequency band. Operation in tracking mode.-The total step aperture 36 of the mode coupler 16 is considered as divided into four sub-apertures as shown in Fig. 4, each sub-aperture having a respective horizontally polarized port and a respective vertically polarized port. The ports are coupled in associated pairs 26, 27; 28, 29; 30, 31; 32, 33 to the inputs of respective short slot hybrids 44 to 47. With right-hand circularly ploarized signals, output ports 1, 3, 5, 7 of the hybrids 44 to 47 are coupled to terminations 55 to 58. Output ports 2, 4 of the hybrids 44, 45 are coupled through a waveguide section 48 to the input ports of a hybrid 50, and output ports 6, 8 of the hybrids 46, 47 are coupled through a waveguide section 49 to the input ports of a hybrid 53. Magic tees 52, 53 are each coupled to each hybrid 52, 53 and respectively provide elevation and azimuth difference mode signals at their output ports 61, 62. For left-hand circularly polarized signals, the ports 2, 4, 6, 8 of the hybrids 44 to 47 are terminated, and the ports 1, 3, 5, 7 are used, in conjunction with waveguide sections 59, 60. Also, the roles of the output ports 61, 62 are reversed. Operation with sum mode signals.-These signals are coupled between one port of a threeport polarizer assembly 12, Fig. 1, and the smaller end of the conical port of the mode coupler 16. The assembly 12 includes an orthogonal coupler 71 (Fig. 8, not shown) constructed of square waveguide sections, in which transmitted signals in the TE 10 mode are combined with received signals in the TE 01 mode. A fixed phase shifter 73, in the form of a square waveguide section which is internally ridged and which is provided with two sets of corner irises, converts the orthogonally polarized transmitted and received waves into right- and left-hand circularly polarized waves (Figs. 9, 10, not shown). A rotatable phase shifter 75, which is similar to the fixed phase shifter 73, is provided at each end with a rotary joint 74, 76 and is geared to an electric motor (Fig. 11, not shown). Circularly polarized waves from the fixed phase shifter 73 are accepted by the rotatable assembly and are transformed back to linear polarized waves at the output of the rotary joint 76. The attitude of the output polarizations is dependent upon the orientation of the phase shifter 75, the orthogonal relationship of the transmitted and received waves remaining at all attitudes. By removing the second phase shifter 75 and the rotary joints 74, 76, operation with circularly polarized signals at the horn is obtained. Reference is made to Specification 1,280,842.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB134272A GB1280842A (en) | 1968-08-21 | 1969-08-14 | Polarization rotator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US75437368A | 1968-08-21 | 1968-08-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1280841A true GB1280841A (en) | 1972-07-05 |
Family
ID=25034510
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB40621/69A Expired GB1280841A (en) | 1968-08-21 | 1969-08-14 | Feed system |
Country Status (4)
Country | Link |
---|---|
US (1) | US3560976A (en) |
JP (1) | JPS5012717B1 (en) |
DE (1) | DE1942678C3 (en) |
GB (1) | GB1280841A (en) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3696434A (en) * | 1971-01-15 | 1972-10-03 | Radiation Inc | Independent mode antenna feed system |
DE2940928A1 (en) * | 1978-10-11 | 1980-04-24 | Prl Soc | STORAGE HEATER |
FR2507826A1 (en) * | 1981-06-11 | 1982-12-17 | Thomson Csf | PRIMARY SOURCE WITH REUSE OF FREQUENCIES |
EP0121612A1 (en) * | 1983-04-01 | 1984-10-17 | ATELIERS DE CONSTRUCTIONS ELECTRIQUES DE CHARLEROI (ACEC) Société Anonyme | Storage heater equipped with a device for controlling the speed of a fan |
DE3381303D1 (en) * | 1983-06-18 | 1990-04-12 | Ant Nachrichtentech | FOUR-TORCH NETWORK FOR MICROWAVE ANTENNAS WITH MONOPULUS TRACKING. |
US4864315A (en) * | 1985-11-05 | 1989-09-05 | Itt Avionics | Phased array antenna testing arrangement |
US4712110A (en) * | 1985-12-26 | 1987-12-08 | General Dynamics, Pomona Division | Five-port monopulse antenna feed structure with one dedicated transmit port |
US4885593A (en) * | 1986-09-18 | 1989-12-05 | Scientific-Atlanta, Inc. | Feeds for compact ranges |
US5175555A (en) * | 1991-03-15 | 1992-12-29 | Harris Corporation | Combined radar altimeter, radiometer sensor employing multiport feed horn having blended sidewall geometry |
US5329285A (en) * | 1991-07-18 | 1994-07-12 | The Boeing Company | Dually polarized monopulse feed using an orthogonal polarization coupler in a multimode waveguide |
US5870060A (en) * | 1996-05-01 | 1999-02-09 | Trw Inc. | Feeder link antenna |
GB0405112D0 (en) * | 2004-03-06 | 2004-04-07 | Univ Belfast | Single aperature monopulse antenna |
US20100238086A1 (en) * | 2009-03-17 | 2010-09-23 | Electronics And Telecommunications Research Institute | Double-ridged horn antenna having higher-order mode suppressor |
WO2018216210A1 (en) * | 2017-05-26 | 2018-11-29 | 三菱電機株式会社 | Polarization separation circuit |
EP4020700A1 (en) * | 2020-12-22 | 2022-06-29 | A.D.S. International S.r.l. | Antenna and antenna system for satellite communications |
-
1968
- 1968-08-21 US US754373A patent/US3560976A/en not_active Expired - Lifetime
-
1969
- 1969-08-14 GB GB40621/69A patent/GB1280841A/en not_active Expired
- 1969-08-20 JP JP44065946A patent/JPS5012717B1/ja active Pending
- 1969-08-21 DE DE1942678A patent/DE1942678C3/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE1942678A1 (en) | 1970-05-21 |
JPS5012717B1 (en) | 1975-05-14 |
DE1942678C3 (en) | 1980-09-18 |
US3560976A (en) | 1971-02-02 |
DE1942678B2 (en) | 1979-12-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3566309A (en) | Dual frequency band,polarization diverse tracking feed system for a horn antenna | |
US3668567A (en) | Dual mode rotary microwave coupler | |
EP0252114B1 (en) | Non-reactive radial line power divider/combiner with integral mode filters | |
GB1280841A (en) | Feed system | |
US4047128A (en) | System filter for double frequency utilization | |
CA1260609A (en) | Wide bandwidth multiband feed system with polarization diversity | |
US3731235A (en) | Dual polarized diplexer | |
US6181221B1 (en) | Reflective waveguide variable power divider/combiner | |
WO2012172565A1 (en) | Wideband waveguide turnstile junction based microwave coupler and monopulse tracking feed system | |
US3569870A (en) | Feed system | |
US2759099A (en) | Plural-source coupling arrangements | |
EP0238650B1 (en) | Broadband, high isolation radial line power divider/combiner | |
US20050231301A1 (en) | Waveguide directional filter | |
US3715688A (en) | Tm01 mode exciter and a multimode exciter using same | |
US2954558A (en) | Omnidirectional antenna systems | |
US4199764A (en) | Dual band combiner for horn antenna | |
US3838362A (en) | Diplexing coupler for microwave system | |
US4158183A (en) | Compact, in-plane orthogonal mode launcher | |
US5001444A (en) | Two-frequency radiating device | |
CN109473774B (en) | Novel dual polarized antenna | |
US3287730A (en) | Variable polarization antenna | |
GB818447A (en) | Microwave antenna feed for circular polarization | |
US2897457A (en) | Resonant directional coupler with square guide | |
US3230484A (en) | Waveguide transition between rectangular and circular waveguides | |
US3588751A (en) | High power microwave power divider |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PE20 | Patent expired after termination of 20 years |