GB1267802A - Improvements in or relating to front-fed aerial systems - Google Patents
Improvements in or relating to front-fed aerial systemsInfo
- Publication number
- GB1267802A GB1267802A GB04357/68A GB1435768A GB1267802A GB 1267802 A GB1267802 A GB 1267802A GB 04357/68 A GB04357/68 A GB 04357/68A GB 1435768 A GB1435768 A GB 1435768A GB 1267802 A GB1267802 A GB 1267802A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lens portion
- over
- face
- lens
- internal reflection
- 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
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/06—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using refracting or diffracting devices, e.g. lens
- H01Q19/08—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using refracting or diffracting devices, e.g. lens for modifying the radiation pattern of a radiating horn in which it is located
Landscapes
- Aerials With Secondary Devices (AREA)
Abstract
1,267,802. Aerials. POST OFFICE. 24 March, 1969 [25 March, 1968], No. 14357/68. Heading H4A. A dielectric lens assembly comprises a waveguide coupling portion consisting of a cylindrical part 1 with a tapered part extending from one end, and a lens portion 3 extending from the other end of said cylindrical part. The lens portion has a face which is outwardly dome-shaped, and it has an axial thickness of not less than 2d<SP>2</SP>/# e , where d = diameter of the cylindrical part 1 and # e = wavelength in the dielectric material of the lens portion 3 at the midband operating frequency. As described, the lens assembly is made of polythene, the coupling portion is fed by a circular waveguide 2 (the tapered part providing matching), and the front face 4 of the lens portion 3 is specially contoured to control the distribution of radiation over an associated aerial reflector, to reduce side-lobes. A chamfer 5 is provided to minimize spill-over, and a circular disc or flange may be fitted over the waveguide behind the lens portion to reduce radiation caused by internal reflection at the face 4. Reduction of internal reflection may also be obtained by drilling quarter wavelength deep holes over the face 4. The dimensions shown in Fig. 1 relate to an assembly for use at a nominal frequency of 4 GHz. In another embodiment (Fig. 2, not shown) a quarter wavelength thickness of a suitable dielectric material is provided over the front face of the lens portion, to reduce internal reflection. In a third embodiment (Fig. 3, not shown) spill over is reduced by making the rear face of the lens portion of frusto-conical form, with an apex angle approximately equal to the angle subtended by the associated aerial reflector.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB04357/68A GB1267802A (en) | 1968-03-25 | 1968-03-25 | Improvements in or relating to front-fed aerial systems |
| US809795A US3611392A (en) | 1968-03-25 | 1969-03-24 | Primary feed for dish reflector having dielectric lens to reduce side lobes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB04357/68A GB1267802A (en) | 1968-03-25 | 1968-03-25 | Improvements in or relating to front-fed aerial systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1267802A true GB1267802A (en) | 1972-03-22 |
Family
ID=10039737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB04357/68A Expired GB1267802A (en) | 1968-03-25 | 1968-03-25 | Improvements in or relating to front-fed aerial systems |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US3611392A (en) |
| GB (1) | GB1267802A (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0030272A1 (en) * | 1979-11-19 | 1981-06-17 | Siemens-Albis Aktiengesellschaft | Cassegrain antenna |
| US4338609A (en) * | 1980-12-15 | 1982-07-06 | Rca Corporation | Short horn radiator assembly |
| US4447811A (en) * | 1981-10-26 | 1984-05-08 | The United States Of America As Represented By The Secretary Of The Navy | Dielectric loaded horn antennas having improved radiation characteristics |
| FR2548466B1 (en) * | 1983-07-01 | 1985-10-25 | Radiotechnique Compelec | TRANSCEIVING DEVICE FOR PRESENCE DETECTION RADAR, AND METHOD FOR MAKING SAME |
| US4878059A (en) * | 1983-08-19 | 1989-10-31 | Spatial Communications, Inc. | Farfield/nearfield transmission/reception antenna |
| US4636798A (en) * | 1984-05-29 | 1987-01-13 | Seavey Engineering Associates, Inc. | Microwave lens for beam broadening with antenna feeds |
| US4673945A (en) * | 1984-09-24 | 1987-06-16 | Alpha Industries, Inc. | Backfire antenna feeding |
| CA1304155C (en) * | 1987-10-02 | 1992-06-23 | Keith C. Smith | Lens/polarizer/radome |
| EP0755092B1 (en) * | 1995-07-17 | 2002-05-08 | Dynex Semiconductor Limited | Antenna arrangements |
| US6480164B2 (en) | 2000-08-03 | 2002-11-12 | Ronald S. Posner | Corrective dielectric lens feed system |
| JP2002319818A (en) * | 2001-04-23 | 2002-10-31 | Murata Mfg Co Ltd | Dielectric lens and its manufacturing method |
| EP1296405B1 (en) * | 2001-09-21 | 2008-05-07 | Alps Electric Co., Ltd. | Satellite broadcast reception converter suitable for miniaturization |
| SE0200792D0 (en) * | 2002-03-18 | 2002-03-18 | Saab Marine Electronics | Horn Antenna |
| EP1734348B1 (en) * | 2005-06-13 | 2010-04-07 | Siemens Milltronics Process Instruments Inc. | Horn antenna with composite material emitter |
| JP6838250B2 (en) * | 2017-06-05 | 2021-03-03 | 日立Astemo株式会社 | Antennas, array antennas, radar devices and in-vehicle systems |
-
1968
- 1968-03-25 GB GB04357/68A patent/GB1267802A/en not_active Expired
-
1969
- 1969-03-24 US US809795A patent/US3611392A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US3611392A (en) | 1971-10-05 |
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