EP1052725B1 - Surface réfléchissant les ondes électromagnétiques et procédé pour sa réalisation - Google Patents

Surface réfléchissant les ondes électromagnétiques et procédé pour sa réalisation Download PDF

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Publication number
EP1052725B1
EP1052725B1 EP00401204A EP00401204A EP1052725B1 EP 1052725 B1 EP1052725 B1 EP 1052725B1 EP 00401204 A EP00401204 A EP 00401204A EP 00401204 A EP00401204 A EP 00401204A EP 1052725 B1 EP1052725 B1 EP 1052725B1
Authority
EP
European Patent Office
Prior art keywords
interlacement
flexible
metal
melting point
filler metal
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 - Lifetime
Application number
EP00401204A
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German (de)
English (en)
French (fr)
Other versions
EP1052725A1 (fr
Inventor
Jean-Louis Van Den Berghe
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 Defence and Space SAS
Original Assignee
EADS Space Transportation 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 EADS Space Transportation SA filed Critical EADS Space Transportation SA
Publication of EP1052725A1 publication Critical patent/EP1052725A1/fr
Application granted granted Critical
Publication of EP1052725B1 publication Critical patent/EP1052725B1/fr
Anticipated expiration legal-status Critical
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
    • 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
    • H01Q15/16—Reflecting surfaces; Equivalent structures curved in two dimensions, e.g. paraboloidal

Definitions

  • the present invention relates to surfaces reflecting electromagnetic waves, such as antenna reflectors, electromagnetic shields, waveguides, etc ... and a method for producing these surfaces.
  • reflecting surfaces - are already known, which are made by metal sheets shaped, for example by stamping, giving them a self-supporting structure.
  • such surfaces have a large mass, so that their dimensions are generally limited. Moreover, because of their mass, they can not be mounted on spacecraft.
  • the metallization of said composite supports generally has a surface state so smooth that the thermal radiation received by such a reflector is concentrated at the focus of the latter. Also, when the source of the reflector is in focus, it is necessary to thermally protect said source, for example by covering the active surface of the reflector with a diffusing paint.
  • the present invention aims to overcome the disadvantages of composite support reflective surfaces, while allowing to obtain reflective surfaces of comparable lightness.
  • the rigid surface reflecting the electromagnetic waves is remarkable in that it consists of an interweaving of electrically conductive wires which are formed superficially of a stable diffusion metal alloy ensuring the securing of said son together and the rigidity of said surface.
  • the present invention eliminates carbon fibers and their disadvantages (parasitic polarization and burst discharges). Moreover, since, in said interlacing, the conductive threads intersect forming microfacettes, the surface, when it is in the form of an antenna reflector, no longer focuses the heat energy to the single focus; on the contrary, this thermal energy passes through a focal spot. As a result, the source is subjected to a lower heat flux and the thermal protection of the source and the reflector may be less complex. It is no longer necessary to cover the surface active diffusing paint reflector, which avoids the distortions generated by it.
  • This flexible interlacing can be achieved in various ways, for example by knitting, wrapping, braiding, lapping, weaving or even by the implementation of nonwoven fiber manufacturing methods.
  • the interlace in the form of a knit has proved particularly advantageous, particularly as regards the diffusion of the heat flux received by said reflecting surface.
  • the electrically conductive son may consist of a metal core covered with said filler metal.
  • the metal superficial is therefore that of the soul.
  • the electrically conductive wires may consist of a plurality of coaxial layers, at least some of which are made of a material - electrically conductive or possibly insulating - different from said surface metal.
  • metals used for the production of electrically conductive wires mention may be made of metals that are good conductors of electricity, such as gold, silver, copper, etc., or even alloys with a low coefficient of thermal expansion, such as some ferro-nickel, or other metals or metal alloys.
  • the filler metals are selected from metals or alloys of low melting point, such as tin or indium, capable of forming a stable alloy by diffusion with the surface metal.
  • the section of the electrically conductive wires may be circular, with a diameter preferably between 6 and 20 microns, or flattened, with a thickness also preferably between 6 and 20 microns and a width preferably between 0.2 and 1 , 5 mm. In these cases, the thickness of the coating of the filler metal may be between 10 Angstrom and 1 micron.
  • the surface according to the present invention may be uniform without holes.
  • a relatively tight interlacing is provided and the application of said uniform pressure closes the possible days of the interlacing.
  • said surface may include holes, provided at the time of the realization of said interlacing.
  • the surface obtained by the stiffened interlacing is reinforced by a reinforcement pressed against one of the faces of said interlacing and secured thereto.
  • a reinforcement may have a fiber composite structure - polymerized matrix. It is then advantageous that the joining of the surface and the reinforcement is obtained by gluing with the aid of the resin of said matrix, the reinforcement being formed on said surface. It must of course, for this purpose, that the polymerization temperature of the resin is lower than the melting temperature of the stable diffusion metal alloy.
  • antenna reflectors that can operate at frequencies between 18 GHz and more than 45 GHz.
  • Figure 1 shows, in plan, an example of interlacing electrically conductive son used in the implementation of the present invention.
  • Figure 2 shows, also in plan, a variant of the interlacing of Figure 1.
  • Figures 3 and 4 are sections respectively along lines III-III and IV-IV of Figures 1 and 2.
  • Figures 5 and 6 illustrate, in section, alternative embodiments of the conductive son used to form the interlacing of Figures 1 and 2.
  • FIGS. 7A to 7F illustrate various phases of the method of producing an antenna reflector according to the present invention.
  • FIG 1 there is shown an interlacing 1 of electrically conductive son 2 and 3 intersecting.
  • the interlacing 1 is represented in the form of a weave with warp threads 2 and weft threads 3, although the interlacing 1 could advantageously consist of stitches knitted.
  • the electrically conductive wires 2 and 3 form gaps 4 between them.
  • each wire 2 and 3 comprises a core 5, for example copper, superficially coated with a coating 6 made of a metal with a low melting point, such as indium.
  • the diameter d of the son 2 and 3 may be preferably between 6 and 20 microns, while the thickness e of the coating 6 may be between 10 Angström and 1 micron.
  • the interlacing 7 is similar to the interlacing 1 of FIG. 1, except that the conductive yarns of wefts and chains 2 and 3 are woven more tightly so as to virtually eliminate voids 4.
  • Figure 3 illustrates the contact of the son 2 and 3 at one of their crossing points
  • Figure 4 illustrates the contact of two son 2 and 3 parallel.
  • the son 2 and 3 interlacing 1 and 7 are secured to each other, which stiffens said interlacing.
  • the stiffening will fix the final shape of said interlacing.
  • the wires 2 and 3 have a circular section.
  • said son could have an oblong section.
  • the thickness of said section may be between 6 and 20 microns and the width L may be between 0.2 and 1.5 mm, the thickness l being the same as above.
  • the wires 2 and 3 could have a multilayered structure.
  • FIG. 6 shows an alternative embodiment of said yarns 2 and 3 in which an intermediate layer 8 is interposed between the core 5 and the surface coating 6.
  • the layer 8 must be in one piece. metal capable of forming a stable diffusion alloy with the coating 6.
  • the temperature rise in the oven 14 leading to the diffusion brazing of the interlacing 1, 7 can be 0.1 ° C per minute, from room temperature to the desired temperature for diffusion, compatible with the temperature of the subsequent polymerization of the resin of the reinforcement 15.
  • Interleaving 1, 7 is maintained at this desired diffusion temperature for a time suitable for diffusion brazing, after which cooling may be natural.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Aerials With Secondary Devices (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
EP00401204A 1999-05-10 2000-05-02 Surface réfléchissant les ondes électromagnétiques et procédé pour sa réalisation Expired - Lifetime EP1052725B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9905901 1999-05-10
FR9905901A FR2793608B1 (fr) 1999-05-10 1999-05-10 Surface reflechissant les ondes electromagnetiques et procede pour sa realisation

Publications (2)

Publication Number Publication Date
EP1052725A1 EP1052725A1 (fr) 2000-11-15
EP1052725B1 true EP1052725B1 (fr) 2006-08-30

Family

ID=9545388

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00401204A Expired - Lifetime EP1052725B1 (fr) 1999-05-10 2000-05-02 Surface réfléchissant les ondes électromagnétiques et procédé pour sa réalisation

Country Status (7)

Country Link
US (1) US6348901B1 (es)
EP (1) EP1052725B1 (es)
JP (1) JP2000349540A (es)
CA (1) CA2308787C (es)
DE (1) DE60030354T2 (es)
ES (1) ES2269076T3 (es)
FR (1) FR2793608B1 (es)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2821491B1 (fr) * 2001-02-23 2005-07-22 Lacroix Soc E Reflecteur electromagnetique deployable
FR2821490B1 (fr) * 2001-02-23 2005-07-22 Lacroix Soc E Reflecteur electromagnetique deployable
FR2821488B1 (fr) * 2001-02-23 2005-09-02 Lacroix Soc E Reflecteur electromagnetique deployable
ATE363742T1 (de) * 2001-02-23 2007-06-15 Lacroix Soc E Entfaltbarer elektromagnetischer reflektor
US20060270301A1 (en) * 2005-05-25 2006-11-30 Northrop Grumman Corporation Reflective surface for deployable reflector

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2275359A1 (fr) * 1974-06-19 1976-01-16 Greze Andre Voile ayant un pouvoir reflecteur aux ondes radar
US4191604A (en) * 1976-01-07 1980-03-04 General Dynamics Corporation Pomona Division Method of constructing three-dimensionally curved, knit wire reflector
US4526817A (en) * 1982-11-01 1985-07-02 Material Sciences Corporation Process for surface diffusing steel products in coil form
US4609923A (en) * 1983-09-09 1986-09-02 Harris Corporation Gold-plated tungsten knit RF reflective surface
US4926910A (en) * 1987-11-23 1990-05-22 Lockheed Missiles & Space Company, Inc. Radio-frequency reflective fabric
GB2256529B (en) * 1991-04-02 1995-08-16 Marconi Electronic Devices Antenna arrangements
US5440801A (en) * 1994-03-03 1995-08-15 Composite Optics, Inc. Composite antenna

Also Published As

Publication number Publication date
CA2308787C (fr) 2008-03-18
DE60030354D1 (de) 2006-10-12
DE60030354T2 (de) 2007-10-31
JP2000349540A (ja) 2000-12-15
FR2793608B1 (fr) 2001-09-14
FR2793608A1 (fr) 2000-11-17
ES2269076T3 (es) 2007-04-01
EP1052725A1 (fr) 2000-11-15
CA2308787A1 (fr) 2000-11-10
US6348901B1 (en) 2002-02-19

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