EP1074061B1 - Systeme d'antenne a alimentation centrale et procede d'optimisation d'un tel systeme d'antenne - Google Patents

Systeme d'antenne a alimentation centrale et procede d'optimisation d'un tel systeme d'antenne Download PDF

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Publication number
EP1074061B1
EP1074061B1 EP99927692A EP99927692A EP1074061B1 EP 1074061 B1 EP1074061 B1 EP 1074061B1 EP 99927692 A EP99927692 A EP 99927692A EP 99927692 A EP99927692 A EP 99927692A EP 1074061 B1 EP1074061 B1 EP 1074061B1
Authority
EP
European Patent Office
Prior art keywords
reflector
antenna system
antenna
copolar
feed system
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
EP99927692A
Other languages
German (de)
English (en)
Other versions
EP1074061A2 (fr
Inventor
Luc Duchesne
Helmut Wolf
Norbert Nathrath
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 DS GmbH
Original Assignee
Astrium GmbH
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 Astrium GmbH filed Critical Astrium GmbH
Publication of EP1074061A2 publication Critical patent/EP1074061A2/fr
Application granted granted Critical
Publication of EP1074061B1 publication Critical patent/EP1074061B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H01Q19/02—Details
    • H01Q19/021—Means for reducing undesirable effects
    • H01Q19/023—Means for reducing undesirable effects for reducing the scattering of mounting structures, e.g. of the struts
    • 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
    • H01Q15/141—Apparatus or processes specially adapted for manufacturing reflecting surfaces
    • 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
    • H01Q19/02—Details
    • H01Q19/021—Means for reducing undesirable effects
    • 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
    • H01Q19/02—Details
    • H01Q19/021—Means for reducing undesirable effects
    • H01Q19/025—Means for reducing undesirable effects for optimizing the matching of the primary feed, e.g. vertex plates
    • 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
    • H01Q19/02—Details
    • H01Q19/021—Means for reducing undesirable effects
    • H01Q19/028—Means for reducing undesirable effects for reducing the cross polarisation
    • 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
    • H01Q19/12—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 wherein the surfaces are concave
    • H01Q19/13—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 wherein the surfaces are concave the primary radiating source being a single radiating element, e.g. a dipole, a slot, a waveguide termination

Definitions

  • the invention relates to a centrally fed antenna system and a method for optimizing one Antenna system.
  • Such antenna systems are usually systems with a single reflector and a feed system, however double reflector systems are also known, in which the Feeding system irradiated a subreflector, which in turn illuminates a main reflector.
  • the following is always spoken of a single reflector antenna system; however are always available for a double reflector antenna system possible.
  • centrally fed antenna systems structurally more compact with a single reflector.
  • Regarding the electromagnetic properties has a centrally fed antenna no offset cross polarization and thereby produces less cross polarization than an antenna system with a single reflector and an offset feed system.
  • centrally powered antennas have two significant disadvantages with regard to electromagnetic Properties: On the one hand, that emanating from the reflector electromagnetic field through the feed system that Supports for the feed system and the feed cables shaded, on the other hand, this electromagnetic field acts the feeding system back.
  • the shading has essentially an influence on the copolar antenna pattern: it there is a ripple in this diagram in the main test, on the other hand, this electromagnetic field acts the feeding system back.
  • the shading has essentially an influence on the copolar antenna pattern: it there is a ripple in this diagram in the main beam direction and a change in the level of the sidelobes.
  • the antenna also has a higher cross polarization occur.
  • the effect on the food system due to the near field emitted by the reflector has essentially an influence on the cross-polar antenna pattern and the reflection factor of the overall system.
  • the shading can be reduced by using the Parts of the antenna system located near the field, i.e. the supports and the feed system as well as the cables, so transparent be designed as possible for the electromagnetic field; electrically conductive cladding is also possible, the additional scatter in the near field avoid and thus reduce the interference in the far field.
  • the near field can affect the feed system can be reduced by interfering or scattering bodies, e.g. small cone-shaped diffuser in the center of the reflector be used.
  • the scattering bodies are shaped so that the stray field and the The reflector reflected the near field in the area of the feed system overlay destructively, so here is a zero is produced. Nevertheless, this stray field is of course annoying also the far field.
  • the invention is based on the object of a centrally fed antenna system to modify so that the effects of shadowing and the Effects on the feed system can be significantly reduced; also should specify a process by which this can be achieved.
  • the actual shape of the effective surface of the reflector system is determined in a computer with the help of a software program.
  • First the surface shape of the reflector is based on a program calculated based on the requirements for the copolar far field, whereby initially the effects of the reaction between the reflector surface and the feed system be ignored.
  • a program is known and will be commonly referred to as a PO program, i.e. Physical optics; see. about “Stig Busk Sorensen: Manual for POS, Physical Optics Single reflector shaping program. TICRA engineering consultants, Copenhagen, Denmark, June 1995 ". This gives you a calculation model of one to the requirements regarding the copolar far field adapted antenna system.
  • This calculation model is then based on an optimization program, which is effective on essentially the whole Reflector surface is used, optimized to that the repercussions of the near field on the food system essentially brought to zero without that through this optimization the properties of the copolar Far field are changed significantly.
  • a centrally fed antenna system 1 is shown in FIG a single reflector 2 and a feed system, in this Trap a horn 3 shown, the horn over four Supports 4 is held centrally above the reflector 2 and over Cable 5 is fed.
  • the reflector 2 is a parabolic reflector, which according to conventional Methods is designed to provide a desired coverage area 6 ( Figure 4) is sufficiently illuminated.
  • the antenna system 1 is e.g. on a communications satellite used so that the coverage area is a certain Area on the earth's surface.
  • the supports 4 as struts with a honeycomb structure made of fiber-reinforced plastic manufactured.
  • Aramid fibers are preferably used as fibers.
  • the horn 3 is covered with a reflective film, e.g. an aluminum foil, roughly wrapped, which in particular serves to reflect the near field on sharp edges etc. to prevent.
  • the surface of the parabolic reflector is first of all with the help of a software program calculated so that the far field the desired coverage area of the antenna system 6 covered. This is done e.g. with the help of the above PO program.
  • the deviations calculated therewith are the optimized ones Reflector surface opposite the preformed reflector surface shown.
  • the data apply to an antenna reflector with a diameter of 100 cm and a Distance of the horn aperture above the center of the parabolic reflector of 40 cm.
  • the frequency band lies with this antenna between 5.8 and 6.4 GHz with double linear polarization.
  • the deviations of the optimized shown in Figure 2 Reflector 2 from the preformed parabolic shape are between -1.74 mm and +4.41 mm.
  • the reflection factor of the overall system is in Reference to the reference system with a preformed parabolic reflector shown in the frequency band between 5.6 and 6.5 GHz.
  • the curve for the reference system shown in copolarization With 7 here is the curve for the reference system shown in copolarization; with 8 is the corresponding curve for the optimized antenna system according to FIGS. 1 and 2 shown. You can see that the values here are significantly better are.
  • the curve for the cross polarization is still shown for the antenna system according to the invention.
  • the mean amplitude for the overall system is at about 22 dB.
  • FIG. 4 there are antenna diagrams in each case over the coverage area 6 for the reference system with parabolic reflector and for the antenna system according to the invention:
  • Figures 4a and 4b show the copolar antenna patterns for the reference system or the system according to the invention, the lines are given the respective dB values are.
  • 4a is clear for the reference system an area approximately in the middle of the covering surface 6 10, which is delimited by a line with 24 dB is.
  • Such an area is in FIG. 4b in the antenna system not available according to the invention.
  • the entire Covering system in the antenna system according to the invention is almost bounded by a range with a dB value of 24.
  • optimizing the overall Surface of the antenna reflector according to the invention that copolar far field can be better designed.
  • the through the Attenuation caused by the horn, the struts and the cables Disorders of the copolar field are resolved with the An tennis system according to the invention greatly reduced.
  • FIG 4c is the antenna diagram of the reference system shown in the cross polarization
  • Figure 4d that of Antenna system according to the invention.
  • a significant improvement the antenna properties can be achieved, i.e. that by optimizing essentially the entire reflector surface the influences of the retroactive effect of the near field the feeding system can be reduced.
  • the overall system is improved so that the disturbing influences due to damping and feedback act on the feeding system like an equivalent one Interferers of more than - 30 dB.
  • the values are in the table at the end of the description for the maximum total reflection factor, the minimum gain at the edge of the illuminated cover area, the minimum Gain within the coverage area in the frequency band between 5.854 and 6.298 GHz, the maximum Cross polarization over the entire coverage area and the minimal cross polarization discrimination XPD, i.e. a Point-by-point correlation between co and cross polarization on the entire illuminated area also listed in the frequency band between 5.854 and 6.298, once for a reference parabolic antenna, then for a parabolic antenna with a central one Disruptive body and finally for an antenna system whose Reflector according to the invention over the entire surface was reshaped.
  • the antenna properties in cross polarization, due to the retroactive effect of the near field the feeding system can be created with a postforming of the entire reflector surface can be designed better than with the use of disruptive bodies.
  • the antenna properties in copolarization on the edge of the covering area are in a reflector surface optimized according to the invention better than when using interfering bodies.
  • the disruptive body disrupt the entire field that originally was designed under copolar requirements.
  • antenna systems with double reflectors i.e. according to a sub-reflector and a main reflector optimize the invention.
  • the sub-reflector irradiated over the entire system Surface optimized to affect the feed system to minimize and optimally illuminate the main reflector.
  • the main reflector becomes like this again optimizes that the maximum of copolarization on the coverage area maximum and the effect on the subreflector is minimal.
  • the optimization agrees very well with the analysis, ie the measured properties of the antenna system agree very well with the previously calculated properties.
  • the method thus provides a very effective tool for constructing antenna systems without complicated and lengthy tests.
  • Y Measurement maximum total reflection factor between 5,850 and 6,425 GHz -15.0 dB -22.0 dB -21.2 dB -23.9 dB Measurement : minimal gain at the edge of the footprint between 5,854 and 6,298 GHz (without cable losses) 23.11 dBi 23.69 dBi 22.95 dBi 23.10 dBi 23.86 dBi 23.73 dBi Measurement : minimum gain within the footprint between 5,854 and 6,298 GHz (without cable losses) 23.17 dBi 23.58 dBi 23.00 dBi 23.09 dBi 23.96 dBi 23.85 dBi Measurement : maximum cross polarization over the entire illumination area between 5,854 and 6,298 GHz (without cable losses) +3.64 dBi +4.76 dBi -1.11 dBi -0.29 dBi -4.37 dBi -5.32 dBi Measurement

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Aerials With Secondary Devices (AREA)

Claims (7)

  1. Système d'antenne à alimentation centrale, comportant un système d'alimentation et un système de réflecteurs qui illumine une surface de couverture et comprend au moins un réflecteur parabolique avec une surface structurée, caractérisé en ce que la surface du réflecteur parabolique (2) présente dans la direction radiale des surélévations et des dépressions auxquelles se superposent au moins partiellement, dans la direction circconférencielle, des surélévations et des dépressions supplémentaires, et en ce que l'ensemble de la structure de la surface de réflecteur avec les surélévations et les dépressions est agencé de telle sorte que le maximum du champ éloigné co-polaire soit situé sur la surface de couverture (6) et le minimum du champ rapproché co-polaire soit situé sur le système d'alimentation (3).
  2. Système d'antennes selon la revendication 1, caractérisé en ce que la surface de réflecteur est conformée de telle sorte que le champ éloigné co-polaire ne soit pas modifié de manière sensible, lorsqu'on optimise le champ rapproché aux fins de réduire les rétro-actions sur le système d'alimentation.
  3. Système d'antennes selon la revendication 1 ou 2, caractérisé en ce que le système d'alimentation (3) présente un faible diamètre d'ouverture.
  4. Système d'antennes selon une des revendications précédentes, caractérisé en ce que le système d'alimentation (3) est supporté par des supports (4) à structure en nid d'abeilles en matière plastique renforcée par fibres.
  5. Système d'antennes selon une des revendications 1 à 4, caractérisé en ce que le système de réflecteurs comporte un réflecteur principal et un réflecteur secondaire, la surface du réflecteur principal ainsi que la surface du réflecteur secondaire comportant des surélévations et des dépressions.
  6. Procédé d'optimisation d'un système d'antenne à alimentation centrale, comportant un système d'alimentation et un système de réflecteurs qui illumine une surface de couverture et comprend au moins un réflecteur parabolique, caractérisé par les étapes suivantes:
    définition d'une surface parabolique pour au moins un réflecteur,
    détermination du champ éloigné du système d'antennes à l'aide d'un premier programme de calcul,
    façonnage essentiellement de l'ensemble de la surface de réflecteur à l'aide d'un deuxième programme de calcul, par formation de surélévations et de dépressions dans la direction radiale et au moins partiellement dans la direction circonférencielle, de telle sorte que l'on obtienne dans la région du système d'alimentation un minimum du champ rapproché co-polaire et que le maximum du champ éloigné co-polaire soit situé sur la surface de couverture.
  7. Procédé selon la revendication 6, caractérisé en ce qu'on procède tout d'abord à une optimisation de la surface du réflecteur secondaire puis à une optimisation d'une surface de réflecteur principal du système de réflecteurs.
EP99927692A 1998-04-21 1999-04-20 Systeme d'antenne a alimentation centrale et procede d'optimisation d'un tel systeme d'antenne Expired - Lifetime EP1074061B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19817766A DE19817766A1 (de) 1998-04-21 1998-04-21 Zentral gespeistes Antennensystem und Verfahren zum Optimieren eines solchen Antennensystems
DE19817766 1998-04-21
PCT/DE1999/001188 WO1999054955A2 (fr) 1998-04-21 1999-04-20 Systeme d'antenne a alimentation centrale et procede d'optimisation d'un tel systeme d'antenne

Publications (2)

Publication Number Publication Date
EP1074061A2 EP1074061A2 (fr) 2001-02-07
EP1074061B1 true EP1074061B1 (fr) 2002-12-11

Family

ID=7865303

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99927692A Expired - Lifetime EP1074061B1 (fr) 1998-04-21 1999-04-20 Systeme d'antenne a alimentation centrale et procede d'optimisation d'un tel systeme d'antenne

Country Status (8)

Country Link
US (1) US6489929B1 (fr)
EP (1) EP1074061B1 (fr)
JP (1) JP2002512462A (fr)
CN (1) CN1292939A (fr)
CA (1) CA2329739C (fr)
DE (2) DE19817766A1 (fr)
DK (1) DK1074061T3 (fr)
WO (1) WO1999054955A2 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4001014B2 (ja) * 2002-12-25 2007-10-31 日本電気株式会社 携帯電話機
JP4468300B2 (ja) * 2003-08-13 2010-05-26 三菱電機株式会社 反射鏡アンテナ装置
JP4673067B2 (ja) * 2005-01-18 2011-04-20 株式会社デバイス アンテナ昇降装置
EP2161784A1 (fr) * 2008-09-05 2010-03-10 Astrium Limited Réflecteur d'antenne
US9190716B2 (en) * 2008-09-05 2015-11-17 Astrium Limited Reflector
US10516216B2 (en) 2018-01-12 2019-12-24 Eagle Technology, Llc Deployable reflector antenna system
US10707552B2 (en) 2018-08-21 2020-07-07 Eagle Technology, Llc Folded rib truss structure for reflector antenna with zero over stretch

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS564903A (en) 1979-06-26 1981-01-19 Nippon Telegr & Teleph Corp <Ntt> Opening surface antenna with improved cross polarization characteristic

Also Published As

Publication number Publication date
EP1074061A2 (fr) 2001-02-07
DK1074061T3 (da) 2003-01-06
WO1999054955A3 (fr) 1999-12-02
US6489929B1 (en) 2002-12-03
DE59903754D1 (de) 2003-01-23
DE19817766A1 (de) 1999-11-11
CA2329739C (fr) 2004-02-24
WO1999054955A2 (fr) 1999-10-28
JP2002512462A (ja) 2002-04-23
CN1292939A (zh) 2001-04-25
CA2329739A1 (fr) 1999-10-28

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