GB1330175A - Radio aerials - Google Patents

Radio aerials

Info

Publication number
GB1330175A
GB1330175A GB3768470A GB1330175DA GB1330175A GB 1330175 A GB1330175 A GB 1330175A GB 3768470 A GB3768470 A GB 3768470A GB 1330175D A GB1330175D A GB 1330175DA GB 1330175 A GB1330175 A GB 1330175A
Authority
GB
United Kingdom
Prior art keywords
reflector
grids
twist
wires
degrees
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
GB3768470A
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.)
Allard Way Holdings Ltd
Original Assignee
Elliott Brothers London Ltd
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 Elliott Brothers London Ltd filed Critical Elliott Brothers London Ltd
Publication of GB1330175A publication Critical patent/GB1330175A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/70—Coupling devices
    • H01R12/7082—Coupling device supported only by cooperation with PCB
    • 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
    • H01Q19/10—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 reflecting surfaces
    • H01Q19/18—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 reflecting surfaces having two or more spaced reflecting surfaces
    • H01Q19/19—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 reflecting surfaces having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface
    • H01Q19/195—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 reflecting surfaces having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface wherein a reflecting surface acts also as a polarisation filter or a polarising device
    • 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
    • H01Q5/45—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements using two or more feeds in association with a common reflecting, diffracting or refracting device

Abstract

1330175 Aerials ELLIOTT BROS (LONDON) Ltd 30 July 1971 [4 Aug 1970] 37684/70 Heading H4A An aerial includes a twist-reflector assembly in which a plurality of grids, each comprising an array of parallel conductors, are arranged in front of a reflector, with the conductors of all grids parallel. The admittances of the individual grids, and the spacings between them and to the reflector are such, that at each of a plurality of operating frequencies, the respective admittances of the assembly to mutually perpendicular components of a predetermined plane polarized wave incident upon the assembly are of relatively inverse magnitude and of opposite sign. As described, a twist-reflector comprises two copper wire grids 5, 6 mounted in front of a continuous aluminium back plate 7. Each grid is formed by bonding the wires to a dielectric skin. Lowdensity dielectric foam sheets are then bonded between the skins, and between the innermost skin and the backplate, to maintain spacings D1, D2. In use, the twist-reflector is arranged with the wires of the grids 5, 6 at 45 degrees to the electric vector of an incident wave. The spacings between the wires of the grids, and the distances D1, D2 are selected so that at two predetermined frequencies the electric vector of the emergent wave is at 90 degrees to that of the incident wave. In application to a Cassegnain type aerial, Fig. 1, not shown, a feed horn projects through a twist-reflector of the kind described, and radiates plane polarized waves towards a parabolic trans-reflector having strips or wires which are parallel to said plane of polarization, and which may be embedded in a fibreglass honeycomb provided with front and rear dielectric reinforcing skins. The transreflector collimates the waves received from the horn, and reflects them towards the twist-reflector, which re-reflects them with their plane of polarization turned through 90 degrees, so that they then pass through the trans-reflector. Scanning may be effected by tilting the twistreflector.
GB3768470A 1970-08-04 1971-07-30 Radio aerials Expired GB1330175A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3768470 1970-08-04

Publications (1)

Publication Number Publication Date
GB1330175A true GB1330175A (en) 1973-09-12

Family

ID=10398257

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3768470A Expired GB1330175A (en) 1970-08-04 1971-07-30 Radio aerials

Country Status (4)

Country Link
US (1) US3771160A (en)
DE (1) DE2139076C2 (en)
FR (1) FR2101220B1 (en)
GB (1) GB1330175A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4471359A (en) * 1982-06-15 1984-09-11 The United States Of America As Represented By The Secretary Of The Navy Dual band, low sidelobe, high efficiency mirror antenna
US4504835A (en) * 1982-06-15 1985-03-12 The United States Of America As Represented By The Secretary Of The Navy Low sidelobe, high efficiency mirror antenna with twist reflector

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL180623C (en) * 1977-01-12 1987-08-17 Philips Nv EXPOSURE FOR AN AERIAL.
FR2448233A1 (en) * 1979-02-02 1980-08-29 Thomson Csf REVERSE CASSEGRAIN ANTENNA FOR MULTI-FUNCTION RADAR
FR2450509A1 (en) * 1979-03-02 1980-09-26 Thomson Csf POLARIZER DEVICE FOR MICROWAVE ANTENNA
FR2451114A1 (en) * 1979-03-09 1980-10-03 Thomson Csf PARALLEL PLAN ANTENNA WITH POLARIZATION ROTATION
FR2458821A1 (en) * 1979-06-13 1981-01-02 Thomson Csf INTERFERENCE REDUCING DEVICE IN ROTARY RECTILINEAR POLARIZATION AND RADAR COMPRISING SUCH A DEVICE
US4977407A (en) * 1981-07-23 1990-12-11 Crane Patrick E Optical collimator
FR2524720A2 (en) * 1982-04-02 1983-10-07 Thomson Csf REVERSE CASSEGRAIN ANTENNA FOR MULTI-FUNCTION RADAR
IL66327A0 (en) * 1982-07-15 1982-11-30
US4574287A (en) * 1983-03-04 1986-03-04 The United States Of America As Represented By The Secretary Of The Navy Fixed aperture, rotating feed, beam scanning antenna system
DE3337049A1 (en) * 1983-10-12 1985-05-09 Gesellschaft für Schwerionenforschung mbH, 6100 Darmstadt SOLID WITH SPECIAL ELECTRICAL PROPERTIES AND METHOD FOR PRODUCING SUCH A SOLID
US5319379A (en) * 1984-08-24 1994-06-07 Hercules Defense Electronics Systems, Inc. Parabolic dual reflector antenna with offset feed
US4786914A (en) * 1985-01-25 1988-11-22 E-Systems, Inc. Meanderline polarization twister
US5003321A (en) * 1985-09-09 1991-03-26 Sts Enterprises, Inc. Dual frequency feed
FR2596208B1 (en) * 1986-03-19 1990-08-03 Europ Agence Spatiale BIFREQUENCY ANTENNA WITH INDEPENDENT ORIENTABLE BEAMS
US5202701A (en) * 1991-07-23 1993-04-13 Grumman Aerospace Corporation Low radar cross section reflector antenna
DE19713735C1 (en) * 1997-04-03 1998-08-20 Daimler Benz Aerospace Ag Process for the production of polarization-selective reflectors
GB9708758D0 (en) * 1997-04-29 1997-06-25 Era Patents Ltd Antenna
US6307522B1 (en) * 1999-02-10 2001-10-23 Tyco Electronics Corporation Folded optics antenna
WO2003063288A1 (en) * 2002-01-17 2003-07-31 Mission Research Corporation Electromagnetic-field polarization twister
EP3830902A4 (en) * 2018-08-08 2022-03-16 Nokia Shanghai Bell Co., Ltd. Antenna

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE37C (en) * 1877-07-12 A. SlEMROTH zu Böhlen, Schwarzburg - Rudolstadt Movable parquet floor and joint locker
US2736895A (en) * 1951-02-16 1956-02-28 Elliott Brothers London Ltd High frequency radio aerials
US3161879A (en) * 1961-01-05 1964-12-15 Peter W Hannan Twistreflector
US3271771A (en) * 1962-02-15 1966-09-06 Hazeltine Research Inc Double-reflector, double-feed antenna for crossed polarizations and polarization changing devices useful therein
US3281850A (en) * 1962-03-07 1966-10-25 Hazeltine Research Inc Double-feed antennas operating with waves of two frequencies of the same polarization
FR1419597A (en) * 1964-03-20 1965-12-03 Thomson Houston Comp Francaise Ultra-shortwave antenna improvements
US3340535A (en) * 1964-06-16 1967-09-05 Textron Inc Circular polarization cassegrain antenna
FR1540954A (en) * 1967-05-16 1968-10-04 Csf Advanced training in transmitting polarizers
US3560984A (en) * 1968-12-11 1971-02-02 Loral Corp Broadband circularly polarized antenna having a continuous rectangular aperture

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4471359A (en) * 1982-06-15 1984-09-11 The United States Of America As Represented By The Secretary Of The Navy Dual band, low sidelobe, high efficiency mirror antenna
US4504835A (en) * 1982-06-15 1985-03-12 The United States Of America As Represented By The Secretary Of The Navy Low sidelobe, high efficiency mirror antenna with twist reflector

Also Published As

Publication number Publication date
DE2139076C2 (en) 1982-08-26
DE2139076A1 (en) 1972-02-10
US3771160A (en) 1973-11-06
FR2101220A1 (en) 1972-03-31
FR2101220B1 (en) 1976-09-03

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee