EP0229617A1 - Vorrichtung zur Orientierung einer Antenne zur Abtastung in zwei orthogonalen Richtungen - Google Patents

Vorrichtung zur Orientierung einer Antenne zur Abtastung in zwei orthogonalen Richtungen Download PDF

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Publication number
EP0229617A1
EP0229617A1 EP87100050A EP87100050A EP0229617A1 EP 0229617 A1 EP0229617 A1 EP 0229617A1 EP 87100050 A EP87100050 A EP 87100050A EP 87100050 A EP87100050 A EP 87100050A EP 0229617 A1 EP0229617 A1 EP 0229617A1
Authority
EP
European Patent Office
Prior art keywords
mirrors
mirror
axis
antenna
orthogonal directions
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.)
Withdrawn
Application number
EP87100050A
Other languages
English (en)
French (fr)
Inventor
Marc Capdepuy
Régis Lenormand
Daniel Renaud
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.)
Alcatel Espace Industries SA
Original Assignee
Alcatel Espace Industries 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 Alcatel Espace Industries SA filed Critical Alcatel Espace Industries SA
Publication of EP0229617A1 publication Critical patent/EP0229617A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/12—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical relative movement between primary active elements and secondary devices of antennas or antenna systems

Definitions

  • the present invention relates to a device for orienting an antenna making it possible to carry out scanning in two orthogonal directions.
  • the invention relates to a device delivering a beam orientable along two orthogonal axes and allowing X-Y scanning.
  • the present invention presents a device for orienting an antenna making it possible to carry out scanning in two orthogonal directions comprising a stationary source, emitting a radioelectric beam, associated with two main and secondary reflectors in offset, characterized in that it comprises a set of at least three mirrors, the first of which is aligned with the secondary reflector and the second and the third of which are integral with two mechanisms for driving in rotation along two axes of orthogonal directions, the direction of the mean axis of the beam between these last two mirrors being that of the beam radiated by the main reflector, the axis of rotation of the first mechanism being collinear with the mean axis of the beam between the first and the second mirror, the axis of rotation of the second mechanism being collinear with the mean axis of the beam coming from the source and which arrives on the third mirror, and in that the main reflectors, and dry the first and the second mirrors are mechanically integral with each other to form a mobile assembly and in that the second mechanism drives both the third mirror and this
  • This invention has the advantage of using two offset reflectors which avoids shadows for the radiation emitted by the main reflector, and makes the entire device particularly compact.
  • the device of the invention is composed of: - a direction ⁇ axis parallel to OX which supports the upper part of the antenna, - a direction ⁇ axis parallel to OY which supports the central part of the antenna and the ⁇ axis, - a fixed part secured to the source.
  • the device of the invention therefore comprises a first assembly movable around the axis ⁇ which comprises: a main reflector 10 in offset, that is to say offset with respect to the top of the parabola which it constitutes, and the center of which is on a line of direction OZ perpendicular to the two axes ⁇ and ⁇ , - a secondary reflector, or sub-reflector, 11 in offset, optionally a lens 12 for focusing the radio beam 21, a first mirror 14 which directs the beam 21, - A second mirror 15 which makes it possible to have two orthogonal axes.
  • This assembly is mounted on the axis of a mechanism 16 which can develop a motor torque large enough to drive the load and which has a high pointing accuracy taking into account the width of the beam.
  • the device comprises a second set which comprises: - a third mirror 17 centered on the axis ⁇ , - the movable part of a mechanism 18 integral with this mirror 17.
  • the drive mechanism 18 around the axis ⁇ may be identical to the drive mechanism 16 around the axis ⁇ . Travel and constraints are much the same.
  • the device finally comprises a fixed part secured to the antenna support, the elements of which can be mechanically connected to one another or be attached individually.
  • This fixed part includes: - The support of the drive mechanism 18 around the axis ⁇ , - a fourth mirror 19, - a source assembly 20 which delivers the radioelectric beam 21.
  • This device which has its stationary source, has the great advantage of avoiding the use of rotating joints and cable reel, and of having to train the radio equipment. It also allows a reduction in the mass to be oriented and a limitation of the disturbing torques.
  • the source 20 emits a radioelectric beam 21 which is reflected successively on the four mirrors 19, 17, 15, 14 before being possibly focused by the converging lens 12 and reaching the sub-reflector 11 then the main reflector 10.
  • the mechanism 18 rotates (22) the mirror 17 along an axis ⁇ ; in a direction parallel to the direction OY, corresponding to the mean axis of the beam 21 between the mirror 19 and the mirror 17.
  • the mirror 17 returns the beam 21 at 90 ° towards the mirror 15.
  • the mirror 15 is integral with the assembly consisting of the mirror 14, the lens 12, the secondary reflector 11, and the main reflector 10.
  • This assembly 15, 14, 12, 11, 10 is mechanically oriented in rotation (23), using the mechanism 16 around the axis ⁇ which is the mean axis of the beam 21 between the mirrors 15 and 14.
  • the mirror 15 therefore receives the beam 21 from the mirror 17 and performs a change of plane to send it in the direction of the mirror 14 which positions said beam 21 in a position centered on the lens 12.
  • the two mechanisms 18 and 16 are therefore positioned in such a way that their axes of rotation ⁇ and ⁇ are coincident with the mean axis of the beam which, respectively, reaches the mirror 17 or which leaves the mirror 15, and are in orthogonal directions between them.
  • the two mirrors 17 and 15 are rotated by the mechanisms 18 and 16 along the axes ⁇ and ⁇ . But each of these two mechanisms drives both the mirror placed on its axis and the upper part of the antenna, along the axis OZ.
  • the drive torque of these mechanisms is greater than the torque required to drive the antenna.
  • the two drive mechanisms 18 and 16 can be identical and include a reduction system which has the advantage of reducing the value of the pitch and increasing the drive torque.
  • Each drive mechanism 18 or 16 comprises an angular coding system, for example a resolver or an optical coder associated with a motor assembly.
  • the different mirrors 19, 17, 15, 14 can be planar or shaped, depending on the applications. At high frequencies the beam 21 from the source can be parallel and the mirrors 19, 17, 15 and 14 are then planes.
  • the source 20 could, in fact, send a beam which directly reaches the mirror 17. But this mirror has the advantage of allowing better positioning of this source 20.
  • This mirror 19 could, in known manner skilled in the art, be replaced by a set of several mirrors.
  • the lens 12 can be eliminated if the beam coming from the mirror 14 is correctly focused to intercept the sub-reflector 11.
  • the antenna orientation system has been shown with an antenna working in transmission, but it would be the same with an antenna working in reception.

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Aerials With Secondary Devices (AREA)
EP87100050A 1986-01-09 1987-01-05 Vorrichtung zur Orientierung einer Antenne zur Abtastung in zwei orthogonalen Richtungen Withdrawn EP0229617A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8600223 1986-01-09
FR8600223A FR2592742B1 (fr) 1986-01-09 1986-01-09 Dispositif d'orientation d'une antenne permettant de realiser un balayage selon deux directions orthogonales

Publications (1)

Publication Number Publication Date
EP0229617A1 true EP0229617A1 (de) 1987-07-22

Family

ID=9330937

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87100050A Withdrawn EP0229617A1 (de) 1986-01-09 1987-01-05 Vorrichtung zur Orientierung einer Antenne zur Abtastung in zwei orthogonalen Richtungen

Country Status (5)

Country Link
US (1) US4821045A (de)
EP (1) EP0229617A1 (de)
JP (1) JPS62160803A (de)
CA (1) CA1257692A (de)
FR (1) FR2592742B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5673057A (en) * 1995-11-08 1997-09-30 Trw Inc. Three axis beam waveguide antenna
US7499673B2 (en) * 2004-03-23 2009-03-03 Cisco Technology, Inc. Configurable diversity antenna system for wireless access points

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3845483A (en) * 1972-03-08 1974-10-29 Nippon Electric Co Antenna system
FR2265190A1 (de) * 1974-03-19 1975-10-17 Thomson Csf
US4042933A (en) * 1976-03-19 1977-08-16 The United States Of America As Represented By The Secretary Of The Navy Antenna line scan system for helicopter wire detection
DE2812627A1 (de) * 1978-03-22 1979-09-27 Siemens Ag Cassegrain-richtantennenanordnung
GB2115229A (en) * 1982-02-15 1983-09-01 Kokusai Denshin Denwa Co Ltd Aerial feed arrangement
DE3400736A1 (de) * 1984-01-11 1985-07-18 Siemens AG, 1000 Berlin und 8000 München Nach dem cassegrain-prinzip arbeitende satellitenfunk-bodenstationsantennenanordnung

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1338471A (fr) * 1962-08-07 1963-09-27 Gen Electric Co Ltd Dispositif régulateur de position notamment pour réseaux d'antennes de radar
JPS5911007A (ja) * 1982-07-12 1984-01-20 Nec Corp ２周波数帯共用のアンテナ装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3845483A (en) * 1972-03-08 1974-10-29 Nippon Electric Co Antenna system
FR2265190A1 (de) * 1974-03-19 1975-10-17 Thomson Csf
US4042933A (en) * 1976-03-19 1977-08-16 The United States Of America As Represented By The Secretary Of The Navy Antenna line scan system for helicopter wire detection
DE2812627A1 (de) * 1978-03-22 1979-09-27 Siemens Ag Cassegrain-richtantennenanordnung
GB2115229A (en) * 1982-02-15 1983-09-01 Kokusai Denshin Denwa Co Ltd Aerial feed arrangement
DE3400736A1 (de) * 1984-01-11 1985-07-18 Siemens AG, 1000 Berlin und 8000 München Nach dem cassegrain-prinzip arbeitende satellitenfunk-bodenstationsantennenanordnung

Also Published As

Publication number Publication date
US4821045A (en) 1989-04-11
FR2592742A1 (fr) 1987-07-10
JPS62160803A (ja) 1987-07-16
FR2592742B1 (fr) 1988-03-18
CA1257692A (fr) 1989-07-18

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Inventor name: CAPDEPUY, MARC