GB1234751A - Improvements in or relating to aerials - Google Patents
Improvements in or relating to aerialsInfo
- Publication number
- GB1234751A GB1234751A GB5373366A GB5373366A GB1234751A GB 1234751 A GB1234751 A GB 1234751A GB 5373366 A GB5373366 A GB 5373366A GB 5373366 A GB5373366 A GB 5373366A GB 1234751 A GB1234751 A GB 1234751A
- Authority
- GB
- United Kingdom
- Prior art keywords
- waveguide
- conductor
- disc
- plate
- radiator
- 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
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
- H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength
- H01Q9/27—Spiral antennas
-
- 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
- H01Q13/10—Resonant slot antennas
- H01Q13/18—Resonant slot antennas the slot being backed by, or formed in boundary wall of, a resonant cavity ; Open cavity antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
- H01Q21/0012—Radial guide fed arrays
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/061—Two dimensional planar arrays
- H01Q21/062—Two dimensional planar arrays using dipole aerials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
- H01Q25/02—Antennas or antenna systems providing at least two radiating patterns providing sum and difference patterns
Landscapes
- Waveguide Switches, Polarizers, And Phase Shifters (AREA)
Abstract
1,234,751. Aerials. GENERAL ELECTRIC CO. Ltd., S. CORNBLEET, and J. BROWN. 22 Jan., 1968 [30 Nov., 1966], No. 53733/66. Heading H4A. A radar aerial array utilizing the static-split principle comprises a shallow cup-shaped metal member 2 having its open end closed by a metal plate 3. The interior of the member 2 is divided by four partitions 4 into quadrants, each quadrant being divided by two arcuate partitions 6 to form a rectangular cross-section waveguide in the configuration of a serpentine channel 7 having three limbs. The outer end of each waveguide 7 is coupled to a respective rectangular cross-section feed waveguide 9, the inner end adjacent the centre boss 5 being short-circuited. The outer surface of plate 3 carries four groups of eight linearly polarized radiators 10, each group being associated with a respective quadrant. The radiators 10 are spaced apart along a waveguide channel 7 a distance equal to ¢#, their positions being denoted by crosses 11. Each radiator 10, Fig. 3, incorporates a dipole radiating element 12 formed by photo-etching a copper layer on the face of a dielectric disc 13. The disc 13 fits in a recess 14 in a copper tube 15, the other end of the tube being flush with the surface of the plate 3 to form a resonant cavity. Each element 12 is coupled to its waveguide 7 by an air-filled coaxial line 16 incorporating a slot excited balun. The outer conductor 17 of the line 16 is bifurcated by slots 18, the ends of the bifurcations having lugs 19 fitting into slots 22 in the disc 13. The other end of the conductor 17 fits in an aperture (not shown) in the plate 3. The inner conductor 21 is connected at one end to the conductor 17 in the slotted region to generate the H 11 coaxial mode, this mode in combination with the existing T.E.M. mode exciting the bifurcations to form a balanced transmission line. The other end of the conductor 21 has a probe 22 extending into the waveguide 7. Inductive irises 23 match out admittances presented by the probes 22. The linearly polarized array may be converted to circular polarization by a polarizing grating placed in front of the array. In an alternative arrangement for obtaining circular polarization, the radiator 24 of Fig. 4 may be used, this radiator comprising two interleaved copper spirals 25 photo-etched on a PTFE disc 26. In a modified construction (Figs. 5, 6, not shown), each quadrant is divided into three separate arcuate waveguides by three concentric circular partitions extending through 360 degrees.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB5373366A GB1234751A (en) | 1966-11-30 | 1966-11-30 | Improvements in or relating to aerials |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB5373366A GB1234751A (en) | 1966-11-30 | 1966-11-30 | Improvements in or relating to aerials |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1234751A true GB1234751A (en) | 1971-06-09 |
Family
ID=10468800
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5373366A Expired GB1234751A (en) | 1966-11-30 | 1966-11-30 | Improvements in or relating to aerials |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1234751A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0132945A1 (en) * | 1983-07-01 | 1985-02-13 | EMI Limited | Antenna |
GB2155694A (en) * | 1984-03-06 | 1985-09-25 | Decca Ltd | Antenna for circularly polarised radiation |
GB2193379A (en) * | 1986-07-24 | 1988-02-03 | Gen Electric Co Plc | Antenna array |
US4907012A (en) * | 1986-10-17 | 1990-03-06 | Thorn Emi Plc | Antenna |
GB2227369A (en) * | 1989-01-18 | 1990-07-25 | Tdk Corp | A circular polarization antenna system |
US5453755A (en) * | 1992-01-23 | 1995-09-26 | Kabushiki Kaisha Yokowo | Circularly-polarized-wave flat antenna |
-
1966
- 1966-11-30 GB GB5373366A patent/GB1234751A/en not_active Expired
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0132945A1 (en) * | 1983-07-01 | 1985-02-13 | EMI Limited | Antenna |
US4680591A (en) * | 1983-07-01 | 1987-07-14 | Emi Limited | Helical antenna array with resonant cavity and impedance matching means |
GB2155694A (en) * | 1984-03-06 | 1985-09-25 | Decca Ltd | Antenna for circularly polarised radiation |
GB2193379A (en) * | 1986-07-24 | 1988-02-03 | Gen Electric Co Plc | Antenna array |
US4912482A (en) * | 1986-07-24 | 1990-03-27 | The General Electric Company, P.L.C. | Antenna |
GB2193379B (en) * | 1986-07-24 | 1990-04-18 | Gen Electric Plc | An antenna |
US4907012A (en) * | 1986-10-17 | 1990-03-06 | Thorn Emi Plc | Antenna |
GB2227369A (en) * | 1989-01-18 | 1990-07-25 | Tdk Corp | A circular polarization antenna system |
GB2227369B (en) * | 1989-01-18 | 1993-05-05 | Tdk Corp | A circular polarization antenna system |
US5453755A (en) * | 1992-01-23 | 1995-09-26 | Kabushiki Kaisha Yokowo | Circularly-polarized-wave flat antenna |
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