EP0141281A2 - Dispositif pour empêcher un décalage du faisceau d'une antenne à polarisation circulaire comportant un réflecteur courbe et une source primaire décentrée - Google Patents

Dispositif pour empêcher un décalage du faisceau d'une antenne à polarisation circulaire comportant un réflecteur courbe et une source primaire décentrée Download PDF

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Publication number
EP0141281A2
EP0141281A2 EP84111833A EP84111833A EP0141281A2 EP 0141281 A2 EP0141281 A2 EP 0141281A2 EP 84111833 A EP84111833 A EP 84111833A EP 84111833 A EP84111833 A EP 84111833A EP 0141281 A2 EP0141281 A2 EP 0141281A2
Authority
EP
European Patent Office
Prior art keywords
correction signal
waves
coupler
correction
reflector
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Withdrawn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
EP84111833A
Other languages
German (de)
English (en)
Other versions
EP0141281A3 (fr
Inventor
Uwe Dipl.-Ing. Leupelt
Anton Dipl.-Ing. Giefing
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0141281A2 publication Critical patent/EP0141281A2/fr
Publication of EP0141281A3 publication Critical patent/EP0141281A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • H01Q19/132—Horn reflector antennas; Off-set feeding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
    • H01Q25/04—Multimode antennas

Definitions

  • the invention relates to a device for preventing a disturbing radiation beam deflection caused by the deflection at an asymmetrical, curved reflector in an antenna, on the curved reflector of which circularly polarized waves are radiated laterally by a primary radiator designed as a horn or waveguide radiator, with the waveguide feed of the primary radiator are excited waves of a higher wave type compared to the fundamental wave, which have the same amplitudes in the opposite phase position as the waves of the wave type which would cause the same disturbing radiation beam deflection as the curved reflector actually causes.
  • a combination of a curved reflector and an off-set horn emitter is often used.
  • a reflector is usually a section of a surface of revolution that is generated by a conic curve.
  • a focal point of the reflector usually coincides with the phase center of the horn.
  • Such arrangements are either used as separate antennas for directional radio, e.g. in the form of horn parabolic antennas and shell antennas, or also for feeding large reflector antennas in satellite radio, for example as a horn parabolic or with a beam waveguide.
  • Typical of the radiation behavior of these side-fed reflectors in linear polarization is a relatively high proportion of cross polarization in the diagram plane of the far field diagram that is assigned to the transverse plane perpendicular to the symmetry plane of the reflector.
  • the aperture field created after the reflection at the reflector is also rotationally symmetrical. If the radiator axis is inclined against the reflector axis when feeding from the side, the aperture field is distorted in such a way that the field lines diverge with increasing center distance and thus have transverse components that are orthogonal to the target polarization.
  • the configuration of the free field responsible for the unwanted main beam deflection in the cross-sectional plane after the reflector can also be described by a spectrum of higher wave types that are excited by the reflector in addition to the existing basic wave type (analogy to excitation of higher wave types in waveguides due to impurities). If such a distorted field, which was created in this form only by the deflection at the curved reflector, strikes the aperture of a waveguide radiator arranged at the location of the focal point, then correspondingly higher wave types can also be excited in the waveguide. They can spread out in the waveguide until the cross section becomes too small. From then on, these wave types are reflected. However, the cross section can often not be made so small, e.g. modes with similar cut-off frequencies as those of the disturbance modes are used for direction finding purposes.
  • the principle of compensating the absolute and frequency-dependent beam deflection (beam squint) in the case of a side-fed reflector antenna for circular polarization is to excite corresponding antiphase wave types of the same amplitude by taking measures in the feed waveguide or in the primary radiator itself.
  • the field generated by the primary radiator becomes the one the deflection reflector is optimally adapted in the sense of compensation.
  • the object of the invention is to achieve a significant reduction in the absolute and frequency-dependent main lobe deflection over a broad band in a laterally fed reflector antenna operated with circular polarization using relatively simple means.
  • this object is achieved in that in the waveguide feed of the primary radiator a mode coupler constructed in the manner of a DF shaft coupler is installed, which has an external signal input to which a correction signal is applied, which excites the compensating waves of the higher wave type in the waveguide feed that the correction signal applied to the outer signal input of the mode coupler is taken from the output of an external correction signal path, in the course of which as a correction network broadband effective, ie frequency-matched passive phase and amplitude adjusters are arranged, which are dimensioned such that the necessary correction signal characteristic is set over the desired frequency band, and that the correction signal path on its input side via a coupler with the part of the signal which only guides the fundamental wave Waveguide feed is connected such that part of the fundamental wave signal is coupled into the correction signal path.
  • a mode coupler constructed in the manner of a DF shaft coupler is installed, which has an external signal input to which a correction signal is applied, which excites the compensating waves of the higher wave type in the waveguide feed that the correction signal applied to the
  • a special mode coupler is thus used to excite the compensating higher waves in the feed waveguide, which has an external signal input.
  • this allows the construction of an external correction signal path, in the course of which broadband effective, i.e. frequency-matched passive phase and amplitude setting elements are installed.
  • broadband effective i.e. frequency-matched passive phase and amplitude setting elements are installed.
  • a predetermined phase and amplitude characteristic is simulated over a wide frequency range, it only having to be permanently set or adjusted once.
  • This signal path is coupled to the fundamental wave signal via the coupler.
  • the correction signal is set by means of the correction network in such a way that, in addition to the lobe deflection generated by the reflector in each case, dispersions of the phase positions in the waveguide feed and in the free space and also the properties of the mode coupler are taken into account.
  • the antenna consists of a curved reflector 9 onto which a horn radiator 8 arranged with its feed center in the reflector focal point radiates laterally circularly polarized waves.
  • the horn 8 is fed via a feed waveguide 7.
  • a signal coupler 3 turns one. only the fundamental wave carrying part 1 of the feed waveguide derived a certain portion of the incoming fundamental wave signal and fed to a correction network 4 via a line 2.
  • the circuit contained in the network 4 consists of various damping circuits 11 and phase elements 10 which serve to adjust the amplitude and are dimensioned such that they set the necessary signal characteristic over the desired frequency band.
  • the correction signal taken from the network 4 is then input to an external input 5 of a mode coupler 6 and is coupled there again as a higher wave type into the feed waveguide 7 and radiated from the horn antenna 8 to the reflector 9 together with the fundamental wave.
  • the additional signal supplied to the outer input 5 of the mode coupler 6 is such that it compensates for the beam deflection component generated by the reflector 9, i.e. the correction network 4 must also take into account, for example, dispersions of the phases in the waveguide 7, in free space (near field) and the properties of the mode coupler 6.

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  • Aerials With Secondary Devices (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
EP84111833A 1983-10-06 1984-10-03 Dispositif pour empêcher un décalage du faisceau d'une antenne à polarisation circulaire comportant un réflecteur courbe et une source primaire décentrée Withdrawn EP0141281A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3336452 1983-10-06
DE19833336452 DE3336452A1 (de) 1983-10-06 1983-10-06 Einrichtung zur verhinderung einer strahlungskeulenauslenkung bei einer fuer zirkularpolarisation vorgesehenen antenne mit einem gekruemmten reflektor und einem seitlich einstrahlenden primaerstrahler

Publications (2)

Publication Number Publication Date
EP0141281A2 true EP0141281A2 (fr) 1985-05-15
EP0141281A3 EP0141281A3 (fr) 1986-07-30

Family

ID=6211205

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84111833A Withdrawn EP0141281A3 (fr) 1983-10-06 1984-10-03 Dispositif pour empêcher un décalage du faisceau d'une antenne à polarisation circulaire comportant un réflecteur courbe et une source primaire décentrée

Country Status (2)

Country Link
EP (1) EP0141281A3 (fr)
DE (1) DE3336452A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004100306A2 (fr) * 2003-04-30 2004-11-18 Alcatel Satellite a couverture multi-zones assuree par deviation de faisceau

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1449265A (fr) * 1965-10-05 1966-08-12 Ass Elect Ind Perfectionnements aux dispositifs d'exploration de faisceaux hyperfréquence
DE1953083A1 (de) * 1968-10-28 1970-05-14 Hughes Aircraft Co Hornantenne
GB1525514A (en) * 1975-10-29 1978-09-20 Rudge A Primary feeds for offset parabolic reflector antennas
JPS544049A (en) * 1977-06-13 1979-01-12 Nippon Telegr & Teleph Corp <Ntt> Offset antenna

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3413642A (en) * 1966-05-05 1968-11-26 Bell Telephone Labor Inc Dual mode antenna
CA890032A (en) * 1970-08-10 1972-01-04 Wu Chuang-Jy Microwave horn-paraboloidal antenna

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1449265A (fr) * 1965-10-05 1966-08-12 Ass Elect Ind Perfectionnements aux dispositifs d'exploration de faisceaux hyperfréquence
DE1953083A1 (de) * 1968-10-28 1970-05-14 Hughes Aircraft Co Hornantenne
GB1525514A (en) * 1975-10-29 1978-09-20 Rudge A Primary feeds for offset parabolic reflector antennas
JPS544049A (en) * 1977-06-13 1979-01-12 Nippon Telegr & Teleph Corp <Ntt> Offset antenna

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
NTG-FACHBERICHTE, "ANTENNEN", NTG-Fachtagung, 8.-11. M{rz 1977, Bad Nauheim, DE, Band 57, Seiten 86-90, VDE-Verlag GmbH, Berlin, DE; G. M\RZ: "Ein neues Mehrmoden-Speisesystem zur elektrisch gesteuerten Strahlschwenkung bei parabolischen Reflektorantennen" *
PATENTS ABSTRACTS OF JAPAN, Band 3, Nr. 26 (E-95), 6. March 1979, Seite 15 E 95; & JP-A-54 004 049 (NIPPON DENSHIN DENWA KOSHA) 01-12-1979 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004100306A2 (fr) * 2003-04-30 2004-11-18 Alcatel Satellite a couverture multi-zones assuree par deviation de faisceau
WO2004100306A3 (fr) * 2003-04-30 2005-01-13 Cit Alcatel Satellite a couverture multi-zones assuree par deviation de faisceau
JP2006525709A (ja) * 2003-04-30 2006-11-09 アルカテル ビーム偏向を用いてマルチゾーンをカバーする衛星
US7545315B2 (en) 2003-04-30 2009-06-09 Thales Satellite with multi-zone coverage obtained by beam deviation
CN1781215B (zh) * 2003-04-30 2011-06-29 阿尔卡特公司 具有通过射束偏移所获得的多区域覆盖的卫星
EP1473799B1 (fr) * 2003-04-30 2021-03-24 Thales Satellite à couverture multi-zones assurée par deviation de faisceau

Also Published As

Publication number Publication date
DE3336452C2 (fr) 1987-09-24
DE3336452A1 (de) 1985-05-02
EP0141281A3 (fr) 1986-07-30

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Inventor name: GIEFING, ANTON, DIPL.-ING.

Inventor name: LEUPELT, UWE, DIPL.-ING.