GB1385737A - Microwave antennas - Google Patents

Microwave antennas

Info

Publication number
GB1385737A
GB1385737A GB4384772A GB4384772A GB1385737A GB 1385737 A GB1385737 A GB 1385737A GB 4384772 A GB4384772 A GB 4384772A GB 4384772 A GB4384772 A GB 4384772A GB 1385737 A GB1385737 A GB 1385737A
Authority
GB
United Kingdom
Prior art keywords
reflector
polarization
waves
plane
sources
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
GB4384772A
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.)
Thales SA
Original Assignee
Thomson CSF SA
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 Thomson CSF SA filed Critical Thomson CSF SA
Publication of GB1385737A publication Critical patent/GB1385737A/en
Expired legal-status Critical Current

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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14—Reflecting surfaces; Equivalent structures
    • H01Q15/22—Reflecting surfaces; Equivalent structures functioning also as polarisation filter
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Aerials With Secondary Devices (AREA)

Abstract

1385737 Aerials THOMSON-CSF 21 Sept 1972 [22 Sept 1971] 43847/72 Heading H4A A multi-beam aerial system comprises a polarization-changing main reflector, a polarization changing sub reflector and a plurality of off-set feed sources. Each reflector has an axis of symmetry, the two axes being concurrent, and a reflecting surface symmetrically disposed thereabout, the two surfaces being shaped to provide aplanatism. The system further comprises a member which is transparent to waves having one kind of polarization and which is reflective of waves having another kind of polarization, said member being interposed between the feed sources and the two reflectors. As described, a feed system 3, Fig. 3, consists of independent sources 30, 31, 32, and respective differently-directed beams are produced therefrom by a reflecting system which comprises a sub-reflector 2 and a main reflector 1. Said reflectors have shapes which are related to the Schwarzchild surfaces, so that the system is aplanatic. The feed system 3 and the subreflector 2 have the same axis, which intersects the axis of the main reflector 1 at right angles at a point A. A plane member 4, which is made up of parallel wires 41, perpendicular to the plane of the figure, is disposed through the point A. Waves from the feed sources are polarized parallel to the plane of the figure, as is shown by P for the source 30, and pass freely through the member 4 to the sub-reflector 2. Here the plane of polarization is rotated by 90 degrees by a twist reflector 21, as is shown by P1, and the waves from the sub-reflector are now reflected by the member 4, to the main reflector 1. Here the plane of polarization is rotated a further 90 degrees by a twist reflector 11, as is shown by P2, and the waves now pass through the member 4, to emerge as a beam in a direction FG. Beams in other directions are similarly derived from the remaining sources, e.g. in a direction KL from the source 32. The sources are sufficiently offset from the axis of the main reflector to prevent aperture blocking. The twist reflectors 11, 21 comprise networks of parallel wires disposed at 45 degrees to the direction of polarization and placed a quarter wavelength from the surfaces of the reflectors 1, 2. The aerial system may be installed in a communications satellite which is required to co-operate with a number of spaced-apart earth stations.
GB4384772A 1971-09-22 1972-09-21 Microwave antennas Expired GB1385737A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7134067A FR2153164B1 (en) 1971-09-22 1971-09-22

Publications (1)

Publication Number Publication Date
GB1385737A true GB1385737A (en) 1975-02-26

Family

ID=9083297

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4384772A Expired GB1385737A (en) 1971-09-22 1972-09-21 Microwave antennas

Country Status (5)

Country Link
US (1) US3797020A (en)
DE (1) DE2246650C2 (en)
FR (1) FR2153164B1 (en)
GB (1) GB1385737A (en)
IT (1) IT965409B (en)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3914768A (en) * 1974-01-31 1975-10-21 Bell Telephone Labor Inc Multiple-beam Cassegrainian antenna
US3953858A (en) * 1975-05-30 1976-04-27 Bell Telephone Laboratories, Incorporated Multiple beam microwave apparatus
FR2458821A1 (en) * 1979-06-13 1981-01-02 Thomson Csf INTERFERENCE REDUCING DEVICE IN ROTARY RECTILINEAR POLARIZATION AND RADAR COMPRISING SUCH A DEVICE
US4259674A (en) * 1979-10-24 1981-03-31 Bell Laboratories Phased array antenna arrangement with filtering to reduce grating lobes
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
EP0170726A1 (en) * 1984-07-13 1986-02-12 Siemens Aktiengesellschaft Dual reflector directional antenna
FR2649543B1 (en) * 1989-07-07 1991-11-29 Thomson Csf HYPERFREQUENCY ENERGY DISTRIBUTOR THAT CAN RADIATE DIRECTLY
FR2655202B1 (en) * 1989-11-24 1992-02-07 Thomson Csf CIRCULAR POLARIZATION ANTENNA, ESPECIALLY FOR ANTENNA NETWORK.
FR2697949B1 (en) * 1992-11-06 1995-01-06 Thomson Csf Antenna for radar, in particular for designation and trajectography.
US5455589A (en) * 1994-01-07 1995-10-03 Millitech Corporation Compact microwave and millimeter wave radar
FR2715511B1 (en) * 1994-01-21 1996-02-23 Thomson Csf Device for compensating for pointing errors caused by breakdowns of phase shifters of electronically scanned antennas or of coefficients of beam-forming antennas by calculation.
ATE196959T1 (en) * 1994-04-08 2000-10-15 Siemens Ag RADAR ANTENNA WITH AT LEAST ONE PRIMARY RADIATOR AND A PARABOLIC REFLECTOR FOR A TRAFFIC RADAR DEVICE FOR TRAFFIC DETECTION
FR2725075B1 (en) * 1994-09-23 1996-11-15 Thomson Csf METHOD AND DEVICE FOR ENLARGING THE RADIATION DIAGRAM OF AN ACTIVE ANTENNA
FR2738397B1 (en) * 1995-08-29 1997-12-05 Thomson Csf METHOD FOR WIDENING THE BEAM OF A STERIC ANTENNA
FR2775347B1 (en) * 1998-02-24 2000-05-12 Thomson Csf METHOD FOR DETERMINING THE SETTING ERROR OF THE RADIANT FACE OF AN ELECTRONICALLY SCANNED NETWORK ANTENNA
US6014108A (en) * 1998-04-09 2000-01-11 Hughes Electronics Corporation Transverse-folded scanning antennas
US6225964B1 (en) * 1999-06-09 2001-05-01 Hughes Electronics Corporation Dual gridded reflector antenna system
RU2012111441A (en) * 2012-03-26 2013-10-10 Джи-хо Ан COMPACT NON-AXISYMMETRIC TWO-MIRROR ANTENNA
US9929474B2 (en) * 2015-07-02 2018-03-27 Sea Tel, Inc. Multiple-feed antenna system having multi-position subreflector assembly

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1396404A (en) * 1964-03-09 1965-04-23 Csf New frequency change system for multi-channel receiver
FR1508062A (en) * 1965-04-12 1968-01-05 Csf Aplanatic antennas

Also Published As

Publication number Publication date
US3797020A (en) 1974-03-12
FR2153164B1 (en) 1976-10-29
DE2246650C2 (en) 1982-08-12
IT965409B (en) 1974-01-31
FR2153164A1 (en) 1973-05-04
DE2246650A1 (en) 1973-03-29

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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