GB1267802A - Improvements in or relating to front-fed aerial systems - Google Patents

Improvements in or relating to front-fed aerial systems

Info

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
Application number
GB04357/68A
Inventor
Dennis Murdoch Knox
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.)
Post Office
Original Assignee
Post Office
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 Post Office filed Critical Post Office
Priority to GB04357/68A priority Critical patent/GB1267802A/en
Priority to US809795A priority patent/US3611392A/en
Publication of GB1267802A publication Critical patent/GB1267802A/en
Expired legal-status Critical Current

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.
GB04357/68A 1968-03-25 1968-03-25 Improvements in or relating to front-fed aerial systems Expired GB1267802A (en)

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)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
US3611392A (en) 1971-10-05

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