WO1988004480A1 - Reflecteur d'antenne composite pourvu d'un reflecteur secondaire polarise - Google Patents

Reflecteur d'antenne composite pourvu d'un reflecteur secondaire polarise Download PDF

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Publication number
WO1988004480A1
WO1988004480A1 PCT/US1987/002919 US8702919W WO8804480A1 WO 1988004480 A1 WO1988004480 A1 WO 1988004480A1 US 8702919 W US8702919 W US 8702919W WO 8804480 A1 WO8804480 A1 WO 8804480A1
Authority
WO
WIPO (PCT)
Prior art keywords
reflector
radiation
horn
polarization
antenna system
Prior art date
Application number
PCT/US1987/002919
Other languages
English (en)
Inventor
Thomas A. Bockrath
Frank A. Taormina
Paramjit S. Bains
Original Assignee
Hughes Aircraft Company
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 Hughes Aircraft Company filed Critical Hughes Aircraft Company
Publication of WO1988004480A1 publication Critical patent/WO1988004480A1/fr

Links

Classifications

    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
    • H01Q25/001—Crossed polarisation dual antennas

Definitions

  • such antennas typically include a feed horn and a reflector.
  • the physical arrangement of the horn and the reflector are determined in large measure by the configuration of the spacecraft, as well as by limitations on weight and requirements for rigidity.
  • the reflector support is formed as a shell of honeycomb material transparent to the electromagnetic energy.
  • the inner and the outer surfaces of the shell are provided with a curvature suitable for forming a beam, a typical surface of curvature being a paraboloid formed by rotation of a parabola about an axis of the surface.
  • strips of electrically conductive material oriented parallel to each other for reflection of electromagnetic energy wherein the electric field is parallel to the. electrically-conductive strips.
  • On the outer surface of the shell there is provided a second set of electrically conductive strips which are parallel to each other and are oriented perpendicularly to the electrically-conductive strips on the inner surface of the shell.
  • Fig.6 is a perspective view, shown diagrammatically, of the antenna system of Fig. 1;
  • Fig. 9 is an enlarged fragmentary view, encircled by the line 9-9 in Fig. 8 of a front surface of the composite reflector of Fig. 1 showing metallic strips which form a front reflecting surface;
  • an antenna 20 comprises a reflector assembly 22 and a feed assembly 24 supported by a base 26.
  • the reflector assembly 22 includes a composite reflector - 28 having a front reflecting surface 30 and a back reflecting surface 32 which are spaced apart from each other by a supporting structure in the form of a dish 34.
  • the dish 34 is secured within an encircling yoke 36 by flanges 38, the yoke 36 upstanding from the base 26 and holding the composite reflector 28 with the front reflecting surface 30 facing the feed assembly 24.
  • the overall thickness of the composite reflector 28 is less than an inch, typically, with the thickness of the core 62 being in the range of 1/4 inch to 1/2 inch.
  • the application of the tape 68 on the front side of the reflector 28 is in the horizontal direction to provide a horizontal polarization to the front reflecting surface 30.
  • the application of the tape 68 to the back side of the reflector 28 is in the vertical direction to provide a vertical polarization • to the back reflecting surface 32.
  • the screen 44 is formed of vertically oriented metallic strips 74 mounted on a substrate 76 which is transparent to electromagnetic radiation. The spacing and width of the strips 74 is the same as that of the strips 72 in the reflector 28.
  • the substrate 76 may also be formed of a polycarbonate.
  • the screen 44 is transparent to horizontally polarized radiation from the horn feed 40 while reflecting vertically polarized radiation from the horn feed 42. Thus, radiation from the feed 40 propagates through the screen 44 to reflect off the front reflecting surface 30 of the reflector 28. Vertically polarized radiation from the feed 42 is reflected by the screen 44 towards the reflector 38 to be reflected from the back reflecting surface 32.
  • the radiation f.rom the feed 40 is reflected by the screen 60, a portion of the reflected radiation passing through the screen 58, the horizontally polarized radiation reflected by the screen 60 impinging upon the reflector 28 to be reflected from the front reflecting surface 30.
  • vertically polarized radiation of the feed 42 is reflected by the screen 58, a portion of the reflected radiation
  • the antenna 50 of Fig.2 and the antenna 20 of Fig. 1 are seen to provide for independent transmission and focusing of their respective horizontally polarized radiations and their respective vertically polarized radiations.
  • the operations of the antennas 20 and 50 are reciprocal such that independent operation at either polarization can be obtained for both received and transmitted radiation signals.
  • FIG. 5-9. The arrangement of the metallic strips 72 in the front reflecting surface 30 is shown in Figs. 5-9. These figures also show the arrangement of the metallic strips 74 on the screen 44. In addition, these figures show the front-to-back arrangement of the feeds 40 and 42 and the point of intercept 86 of each of the front and the back reflecting surfaces 30 and 32 upon a line 88. While the hatching in Figs. 5-8 is directed to only one of the feed assemblies, namely the feed assembly 24 of the antenna 20, the showing of the horizontally arranged metallic strips 72 of the front reflecting surface 30 applies to both the antennas 20 and 50 of Figs. 1 and 2. Also, the enlarged fragmentary view of Fig. 9 applies to both the antennas 20 and 50 of Figs. 1 and 2.
  • Rays of radiation may propagate from distant points towards the reflector, or in the reverse direction, along a path 90 shown in Figs. 7 and 12.
  • Vertically polarized radiation received along the path 90 is focused by the back reflecting surface 32 to a focus at the mouth of the horn feed 42.
  • Horizontally polarized radiation received along the path- 90 is focused by the front reflecting surface 30 to a focus located at the mouth of the horn feed 40.
  • the two focuses are located on a line 88 in Fig. 7, and in Fig. 12 are located equidistant from the line 88.
  • the arrangement of the reflector 28 as depicted in Figs.

Landscapes

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

Abstract

Une structure de réflecteur composite (28) pour un système d'antenne de vaisseau spatial (20, 50) est formée sur un matériau à nid d'abeille, transparent au rayonnement électromagnétique et possédant des surfaces courbes externe et interne (30, 32) écartées de manière essentiellement uniforme et présentant des ensembles correspondants d'éléments réfléchissants internes et externes (68). Les ensembles d'éléments réfléchissants (68) comprennent des bandes parallèles en matériau électriquement conducteur (72), les bandes sur la surface interne (30) étant perpendiculaires aux bandes sur la surface externe (32). Les deux ensembles d'éléments réfléchissants (68) sont suffisamment écartés l'un de l'autre pour conférer une rigidité adéquate à la structure de support (62). Une paire de pavillons d'alimentation (40, 42) éclairent les réflecteurs (68) via un réflecteur secondaire (44) présentant une surface sensible à la polarisation, qui réfléchit les ondes électromagnétiques polarisées dans un plan et transmet les ondes électromagnétiques polarisées dans un plan perpendiculaire. Cet agencement des composants du système d'antenne permet le positionnement individuel des pavillons d'alimentation (40, 42) de chaque côté des réflecteurs respectifs, tout en maintenant une transmission indépendante découplée des signaux à polarisation transversale, et réduit le poids global tout en conservant une rigidité adéquate à toute la structure. Chaque pavillon d'alimentation (40, 42) peut être remplacé par un réseau de pavillons d'alimentation ayant la même polarisation que le pavillon qu'ils remplacent.
PCT/US1987/002919 1986-12-11 1987-11-09 Reflecteur d'antenne composite pourvu d'un reflecteur secondaire polarise WO1988004480A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US94038986A 1986-12-11 1986-12-11
US940,389 1986-12-11

Publications (1)

Publication Number Publication Date
WO1988004480A1 true WO1988004480A1 (fr) 1988-06-16

Family

ID=25474734

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1987/002919 WO1988004480A1 (fr) 1986-12-11 1987-11-09 Reflecteur d'antenne composite pourvu d'un reflecteur secondaire polarise

Country Status (3)

Country Link
EP (1) EP0293429A1 (fr)
JP (1) JPH01502230A (fr)
WO (1) WO1988004480A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2264006A (en) * 1992-02-01 1993-08-11 British Aerospace Space And Co A reflector antenna assembly for dual linear polarisation.
EP1244176A1 (fr) * 2001-03-22 2002-09-25 Alcatel Antenne à reflecteur double avec deflecteur
EP4142055A1 (fr) * 2021-08-27 2023-03-01 PCTEL, Inc. Système d'alimentation d'antenne à double polarisation

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2492526B1 (fr) 2011-02-22 2017-10-18 Dirk Richter Cylindre et procédé de revêtement de cylindres
JP6482493B2 (ja) * 2016-04-15 2019-03-13 三菱電機株式会社 グリッドリフレクタ及びグリッドリフレクタ製造方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2983918A (en) * 1956-09-11 1961-05-09 Magneti Marelli Spa Bilateral transmission system
US3810185A (en) * 1972-05-26 1974-05-07 Communications Satellite Corp Dual polarized cylindrical reflector antenna system
GB2166001A (en) * 1984-10-15 1986-04-23 Rca Corp Dual gridded reflector structure
US4647938A (en) * 1984-10-29 1987-03-03 Agence Spatiale Europeenne Double grid reflector antenna

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2983918A (en) * 1956-09-11 1961-05-09 Magneti Marelli Spa Bilateral transmission system
US3810185A (en) * 1972-05-26 1974-05-07 Communications Satellite Corp Dual polarized cylindrical reflector antenna system
GB2166001A (en) * 1984-10-15 1986-04-23 Rca Corp Dual gridded reflector structure
US4647938A (en) * 1984-10-29 1987-03-03 Agence Spatiale Europeenne Double grid reflector antenna

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2264006A (en) * 1992-02-01 1993-08-11 British Aerospace Space And Co A reflector antenna assembly for dual linear polarisation.
GB2264006B (en) * 1992-02-01 1995-09-27 British Aerospace Space And Co A reflector antenna assembly for dual linear polarisation
US5581265A (en) * 1992-02-01 1996-12-03 Matra Marconi Space Uk Limited Reflector antenna assembly for dual linear polarization
EP1244176A1 (fr) * 2001-03-22 2002-09-25 Alcatel Antenne à reflecteur double avec deflecteur
US6759993B2 (en) 2001-03-22 2004-07-06 Alcatel Dual polarization antenna with low side lobes
EP4142055A1 (fr) * 2021-08-27 2023-03-01 PCTEL, Inc. Système d'alimentation d'antenne à double polarisation

Also Published As

Publication number Publication date
JPH01502230A (ja) 1989-08-03
EP0293429A1 (fr) 1988-12-07

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