EP0466579A1 - Doppelreflektor mit Gitter - Google Patents

Doppelreflektor mit Gitter Download PDF

Info

Publication number: EP0466579A1
Authority: EP; European Patent Office
Prior art keywords: reflector; front reflector; birflector; grid; rear reflector
Prior art date: 1990-07-11
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.): Granted

Application number

EP91401907A

Other languages

English (en)

French (fr)

Other versions

EP0466579B1 (de

Inventor

Jean-Denis Lefebvre

Olivier Lach

Alain Noir

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.)

Airbus Group SAS

Original Assignee

Airbus Group SAS

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.)

1990-07-11

Filing date

1991-07-09

Publication date

1992-01-15

1991-07-09 Application filed by Airbus Group SAS filed Critical Airbus Group SAS

1992-01-15 Publication of EP0466579A1 publication Critical patent/EP0466579A1/de

1995-01-04 Application granted granted Critical

1995-01-04 Publication of EP0466579B1 publication Critical patent/EP0466579B1/de

2011-07-09 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

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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
- H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
- H01Q25/001—Crossed polarisation dual antennas

Definitions

the present invention relates to a grate bireflector, structure comprising two antenna reflectors, intended for the use of several pairs of radio waves of the same frequency, the waves of a pair being of orthogonal polarizations between them.
Antenna systems are known which allow frequency reuse by means of perpendicularly polarized sources and reflectors. Such systems are widely used in the field of satellite applications. For a given frequency, two perpendicularly polarized waves are produced by two separate decoupled sources; this doubles the transmission capacity for the same antenna system, compact and light.
the known devices have two reflectors in the form of a parabolic dish.
An example of such a device according to the prior art can be seen in FIG. 1, which is also similar to the antenna bi-reflector described in the document GB-A-2 125 633.
the cuvettes of the reflectors 10, 12 are for example, each consisting of a honeycomb core formed of a Kevlar fabric (Kevlar is a registered trademark of the Company EI Dupont), sandwiched between two skins, also made of Kevlar.
Kevlar is a registered trademark of the Company EI Dupont
a grid 14, 16 made of closely spaced parallel conductors which are oriented so that the reflectors reflect waves polarized perpendicularly.
the two reflectors 10, 12 are held together by fixing means comprising a peripheral structure 18, for example consisting of a honeycomb core of Kevlar and sandwiched between two skins of Kevlar and support ribs 20 formed likewise.
fixing means comprising a peripheral structure 18, for example consisting of a honeycomb core of Kevlar and sandwiched between two skins of Kevlar and support ribs 20 formed likewise.
Kevlar is chosen for its transparency properties to radio waves. But it is an expensive material and difficult to work: thus obtaining honeycomb structures is long and painful.
the known devices have two reflectors provided with different grids.
the production of these grids requires very delicate mechanical processes to be implemented.
Document FR-A-1 141 476 also describes a system of antennas directed with two reflectors for front and rear, of which the rear reflector, made up of a simple sheet, has no property of selectivity with respect to of the direction of polarization of the radiation to be reflected. This document however does not describe any filtering means between the two reflectors to eliminate any residual component of the polarized radiation intended for the first reflector.
the object of the present invention is to overcome these drawbacks: to reduce the cost of manufacturing by reducing the need for Kevlar and simplifying the production of a frequency reuse reflector system using a single reflector provided with a grid, the second reflector does not have one.
the invention recommends the use of a front reflector provided with a grid oriented so as to reflect radio waves linearly polarized in a determined direction of polarization and a rear reflector capable of reflecting radio waves without distinction of polarization .
the rear reflector requires only a continuous and reflective surface, without a grid, which can be of less expensive material and having better mechanical characteristics (in particular better rigidity) than Kevlar.
FIG. 2 a schematic representation of an antenna system with a bireflector according to the invention.
Two sources S1 and S2 deliver radio signals of the same frequency, linearly polarized and perpendicular to each other. These sources S1 and S2 are arranged on a support 22 which also maintains the bireflector 24.
the latter is composed of two reflectors 26, 28, for example in the form of a truncated section of parabola of revolution.
the front reflector 26 completely covers the rear reflector 28 and is maintained at a distance determined by assembly means 30. But the overlap of the reflectors 26, 28 can also be partial.
the spacing between the reflectors is such that it makes the focal axes of the reflectors parallel to each other without however being confused.
the reflectors in the form of a parabola of revolution in the embodiment more particularly shown, are centered and their centers (commonly called vertices) are offset with respect to each other.
the front reflector 26 is arranged so as to reflect one of the radio signals (that coming from the source S1 in this example) while it is transparent to the other.
the rear reflector 28 is capable of reflecting any radioelectric radiation without distinction of polarization.
FIG 3 is a schematic exploded view of a portion of the front reflector.
the latter comprises a shell 32 constituted by a honeycomb structure, for example Kevlar or any other material transparent to radio waves and having adequate rigidity qualities.
the shell 32 has a thickness eK chosen so as to optimize the radioelectric performance of the bireflector. In the example described and shown, the frequency range from 10 to 14 GHz, the thickness of a Kevlar structure is chosen equal to 6.35 mm; in fact, the reflection coefficient of the structure presents approximately a maximum for this value.
the shell 32 On its front face, the shell 32 is covered by a skin 34, also made of Kevlar for example.
the skin 34 is covered with a grid 36 made of electrical conductors 38 spaced apart so that their projections on a plane perpendicular to the focal axis of the reflector are parallel to each other; moreover, in projection on this plane, the length and the pitch of these conductors are constant.
These conductors 38 can be, for example, copper strips; they are either fixed in a medium transparent to radio frequencies, for example polymides, or directly bonded using an epoxy type glue which does not degass under vacuum.
the bireflector comprises a filtering means which makes it possible to eliminate any residual component of the polarized radiation linearly reflected by the front reflector, to avoid its reflection by the rear reflector.
the filtering means is composed of a grid 40 of conductors arranged to reflect a linearly polarized radioelectric radiation, parallel to that reflected by the front reflector 26; this grid 40 is supported by the dorsal face of the shell 32 of the front reflector.
the projections of the filter conductors in a plane perpendicular to the focal axis of the reflector are parallel to each other and to the projections of the conductors of the front grid 36.
This second grid 40 is produced in a similar manner to the front grid 36.
a second skin 42 for example made of Kevlar, covers the filtering grid 40.
the filter grid 40 introduces a certain symmetry into the structure of the front reflector 26, which has the advantage of improving its resistance. mechanical and its rigidity.
the radioelectric radiation emitted by the source S1 is therefore completely reflected by the front reflector 26.
the latter is almost transparent (by construction: choice of materials, positioning of the grids) to the radiation emitted by the source S2 which is reflected by the rear reflector.
Figure 4 is a schematic exploded view of a portion of the rear reflector. This one is able to reflect any radioelectric radiation independently of its polarization:
the rear reflector 28 consists of a shell 44, having a honeycomb structure of conductive material, for example aluminum, sandwiched between two identical skins 46, each made of four layers 48, for example of carbon fibers.
the shell 44 has a thickness eA chosen so as to ensure good thermomechanical behavior of the bireflector.
the thickness eA is for example chosen, for an aluminum shell, in a range going from 20 to 40 mm. In the example described, eA is equal to 25 mm.
the number of layers 48 making up the skins 46 is also chosen to ensure good thermomechanical behavior of the assembly.
the orientation of the carbon fibers of each layer 48 is chosen so as to ensure, on the one hand, the mechanical strength of the reflector, but also so that the latter has a coefficient of expansion substantially zero at operating temperatures.
Figure 5 shows schematically the assembly means connecting the reflectors to each other.
This assembly means maintains the spacing between the reflectors. This spacing varies, depending on the position on the circumference of a reflector, from a minimum spacing to a maximum spacing, diametrically opposite.
the assembly means consists of a peripheral structure 50, two internal stiffeners 52 in the form of mutually parallel support ribs and spacers 54. These elements are held on the reflector rear 28 by bonding on shims 56, for example Kevlar or any other material transparent to radio waves and having the required thermomechanical properties, fixed to the rear reflector.
shims 56 for example Kevlar or any other material transparent to radio waves and having the required thermomechanical properties, fixed to the rear reflector.
the shims 56 are for example fixed to the rear reflector by mechanical fixing means (not shown) which can be dismantled or not.
the shims 56 are distributed along the peripheral structure on either side of the internal stiffeners 52 and the spacers 54.
the elements constituting the assembly means are bonded using an insulating adhesive which is not loaded on the dorsal face of the front reflector 26.
the peripheral structure 50 is made of honeycomb, for example Kevlar.
the internal stiffeners 52 also have a honeycomb structure, for example Kevlar. They are perforated so as to reduce their mass. They are arranged so as to disturb the radiation pattern of the reflectors as little as possible.
the projection PR of the stiffeners 52 on a plane P perpendicular to the focal axes AF of the reflectors is parallel to the projections PC of the conductors of the grids 38 of the front reflector 26.
the projection PR of the stiffeners 52 on the plane P perpendicular to the focal axes AF of the reflectors is perpendicular to the projections PC of the conductors of the grids 38 of the front reflector 26.
stiffeners 52 are fixed perpendicular to the dorsal face of the front reflector 26.
spacers 54 made of Kevlar or any other material transparent to radio waves and having the required rigidity. These spacers 54 are for example arranged at regular intervals, on an axis parallel to the internal stiffeners 52 and passing through the top of the rear reflector. The spacers 54 fixed to each of the reflectors reduce the thermomechanical deformations of the front reflector by stress by resting on the rear reflector which has a substantially zero coefficient of expansion.
a bi-reflector according to the invention thanks to the use of a rear reflector capable of reflecting any radio wave independently of its polarization makes it possible to simplify the construction of the assembly and to reduce costs. On the other hand, the materials used make it possible to obtain better thermomechanical stability of the assembly.

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

EP19910401907 1990-07-11 1991-07-09 Doppelreflektor mit Gitter Expired - Lifetime EP0466579B1 (de)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
FR9008828		1990-07-11
FR9008828A FR2664750B1 (fr)	1990-07-11	1990-07-11	Bireflecteur a grilles.

Publications (2)

Publication Number	Publication Date
EP0466579A1 true EP0466579A1 (de)	1992-01-15
EP0466579B1 EP0466579B1 (de)	1995-01-04

Family

ID=9398599

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP19910401907 Expired - Lifetime EP0466579B1 (de)	1990-07-11	1991-07-09	Doppelreflektor mit Gitter

Country Status (5)

Country	Link
EP (1)	EP0466579B1 (de)
JP (1)	JP3208154B2 (de)
DE (1)	DE69106443T2 (de)
ES (1)	ES2067178T3 (de)
FR (1)	FR2664750B1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP0640844A1 (de) *	1993-08-23	1995-03-01	Alcatel Espace	Doppelstrahlantenne mit elektronischer Strahlablenkung
FR2719162A1 (fr) *	1994-04-20	1995-10-27	Sadones Henri	Antenne de faisceau hertzien à au moins deux directions de réflexion.
FR2761818A1 (fr) *	1997-04-03	1998-10-09	Daimler Benz Aerospace Ag	Procede de fabrication de reflecteurs selectifs en polarisation
WO2002061882A1 (en) *	2001-02-02	2002-08-08	Saab Ericsson Space Ab	Reflector and antenna system containing reflectors
WO2010102764A1 (de) *	2009-03-13	2010-09-16	Hps High Performance Space Structure Systems Gmbh	Reflektorsystem für eine polarisationsselektive antenne mit doppelt linearer polarisation
RU2640099C2 (ru) *	2012-07-25	2017-12-26	Орбитал Сайенсиз Корпорейшн	Системы и способы для уменьшения возмущений в антенне с двойным сетчатым отражателем

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
JP5305994B2 (ja) *	2009-03-12	2013-10-02	三菱電機株式会社	アンテナ装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
FR1141476A (fr) *	1954-11-11	1957-09-03	Patelhold Patentverwertung	Système d'antennes dirigées comportant des réflecteurs de renvoi
EP0002982A1 (de) *	1977-12-22	1979-07-11	Thomson-Csf	Antenne mit konischer Abtastung für Verfolgungsradar
EP0045254A1 (de) *	1980-07-29	1982-02-03	Thomson-Csf	Kompakter Mikrowellenerreger für zwei Frequenzbereiche
GB2125633A (en) *	1982-08-16	1984-03-07	Rca Corp	Antenna construction

1990
- 1990-07-11 FR FR9008828A patent/FR2664750B1/fr not_active Expired - Lifetime
1991
- 1991-07-09 EP EP19910401907 patent/EP0466579B1/de not_active Expired - Lifetime
- 1991-07-09 ES ES91401907T patent/ES2067178T3/es not_active Expired - Lifetime
- 1991-07-09 DE DE1991606443 patent/DE69106443T2/de not_active Expired - Lifetime
- 1991-07-10 JP JP17002391A patent/JP3208154B2/ja not_active Expired - Fee Related

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
FR1141476A (fr) *	1954-11-11	1957-09-03	Patelhold Patentverwertung	Système d'antennes dirigées comportant des réflecteurs de renvoi
EP0002982A1 (de) *	1977-12-22	1979-07-11	Thomson-Csf	Antenne mit konischer Abtastung für Verfolgungsradar
EP0045254A1 (de) *	1980-07-29	1982-02-03	Thomson-Csf	Kompakter Mikrowellenerreger für zwei Frequenzbereiche
GB2125633A (en) *	1982-08-16	1984-03-07	Rca Corp	Antenna construction

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP0640844A1 (de) *	1993-08-23	1995-03-01	Alcatel Espace	Doppelstrahlantenne mit elektronischer Strahlablenkung
FR2709380A1 (fr) *	1993-08-23	1995-03-03	Alcatel Espace	Antenne bi-faisceaux à balayage électronique.
US5652597A (en) *	1993-08-23	1997-07-29	Alcatel Espace	Electronically-scanned two-beam antenna
FR2719162A1 (fr) *	1994-04-20	1995-10-27	Sadones Henri	Antenne de faisceau hertzien à au moins deux directions de réflexion.
FR2761818A1 (fr) *	1997-04-03	1998-10-09	Daimler Benz Aerospace Ag	Procede de fabrication de reflecteurs selectifs en polarisation
WO2002061882A1 (en) *	2001-02-02	2002-08-08	Saab Ericsson Space Ab	Reflector and antenna system containing reflectors
WO2010102764A1 (de) *	2009-03-13	2010-09-16	Hps High Performance Space Structure Systems Gmbh	Reflektorsystem für eine polarisationsselektive antenne mit doppelt linearer polarisation
RU2640099C2 (ru) *	2012-07-25	2017-12-26	Орбитал Сайенсиз Корпорейшн	Системы и способы для уменьшения возмущений в антенне с двойным сетчатым отражателем

Also Published As

Publication number	Publication date
JP3208154B2 (ja)	2001-09-10
EP0466579B1 (de)	1995-01-04
FR2664750A1 (fr)	1992-01-17
DE69106443T2 (de)	1995-08-10
DE69106443D1 (de)	1995-02-16
ES2067178T3 (es)	1995-03-16
FR2664750B1 (fr)	1993-01-29
JPH04253404A (ja)	1992-09-09

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Date	Code	Title	Description
1991-11-29	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
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1994-11-18	GRAA	(expected) grant	Free format text: ORIGINAL CODE: 0009210
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1995-11-04	STAA	Information on the status of an ep patent application or granted ep patent	Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT
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