EP0677212B1 - Wendelantennensystem - Google Patents

Wendelantennensystem Download PDF

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Publication number
EP0677212B1
EP0677212B1 EP94904615A EP94904615A EP0677212B1 EP 0677212 B1 EP0677212 B1 EP 0677212B1 EP 94904615 A EP94904615 A EP 94904615A EP 94904615 A EP94904615 A EP 94904615A EP 0677212 B1 EP0677212 B1 EP 0677212B1
Authority
EP
European Patent Office
Prior art keywords
helical
feeders
antenna system
group
antenna
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
EP94904615A
Other languages
English (en)
French (fr)
Other versions
EP0677212A1 (de
Inventor
Ali Louzir
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.)
Technicolor SA
Original Assignee
Thomson Multimedia 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 Thomson Multimedia SA filed Critical Thomson Multimedia SA
Priority to EP94904615A priority Critical patent/EP0677212B1/de
Publication of EP0677212A1 publication Critical patent/EP0677212A1/de
Application granted granted Critical
Publication of EP0677212B1 publication Critical patent/EP0677212B1/de
Anticipated expiration legal-status Critical
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q11/00—Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
    • H01Q11/02—Non-resonant antennas, e.g. travelling-wave antenna
    • H01Q11/08—Helical antennas
    • 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
    • H01Q19/17—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 comprising two or more radiating elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
    • H01Q21/061—Two dimensional planar arrays
    • H01Q21/067—Two dimensional planar arrays using endfire radiating aerial units transverse to the plane of the array
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction

Definitions

  • the present invention relates to an antenna system having helical feeders.
  • a helical feeder antenna consists of a single conductor or multiple conductors wound into a helical shape. Beside some other possible modes a helical antenna is normally used in a so-called axial mode or in a normal mode.
  • the axial mode provides maximum radiation along the helix axis, which occurs when the helix circumference is of the order of one wavelength.
  • the normal mode which yields radiation broadside to the helix axis, occurs when the helix diameter is small with respect to a wavelength.
  • the axial mode is of special interest.
  • US-patent 3 184 747 presents a coaxial feed helical antenna which has a director disk between feed and helix producing endfire radiation towards the disk.
  • the dimensions of the helix for such an antenna system are given.
  • US 4 742 359 presents an antenna system using a helical antenna with two ends where the first end is linked to a feeder line.
  • a helical antenna may be built as a so-called endfire helical antenna, where under maximum received power conditions the direction of the signal power flow at the said first end is in the same direction as the received radiation.
  • a helical antenna can also be built as a so-called backfire helical antenna, where under maximum received power conditions the direction of the signal power flow at the said first end is in the opposite direction to the received radiation.
  • an antenna system which comprises a reflector, a primary helical antenna having a coil with a pair of ends, said coil located at the focal point of said reflector so that the axis of the helical antenna coincides essentially with the axis of said reflector.
  • a feeder line couples the antenna system with an external circuit, so that said primary helical antenna represents a backfire helical antenna coupled with said feeder line at the nearer end from said reflector and the other end of the helical antenna is free standing, and said feeder line is a coaxial cable.
  • a helix wound like a right-hand screw receives right-hand circular polarization
  • a helix wound like a left-hand screw receives left-hand polarization. If both polarization directions are to be received simultaneously there must be provided at least two helices. If these helices are part of an antenna system using focussing means, it is impossible to have at the same time the two feeders in the focal point of the focussing means. Thereby inacceptable gain degradation is involved for at least one of the polarization directions. Additionally it is possible that cross-talk occurs due to inevitable defocussing and/or strong coupling between the helices if placed too close to each other.
  • JP-A- 5 438 745 discloses an antenna system comprising a parobolic reflector and four spiral antennas for receiving left-hand and right-hand polarizations arranged around the focal point of the reflector.
  • JP-A- 1037107 presends an antenna system with helical lines for left-handed and right-handed circularly polarized waves.
  • helical feeder there is not just one helical feeder provided for each polarization direction, but two or more. These helical feeders work preferably in the axial backfire mode.
  • Means for focussing e.g. a parabolic reflector, a dielectric lens, like a Luneburg-type lens, or the like, have a focal point in which they focus an incoming radiation. If radiations with two opposite polarizations are to be received two helical feeders are to be provided near the focal point. That means that not the two helices can be located together at the focal point. To compensate the according gain degradation there are two or more helices for each polarization direction provided according to the present invention.
  • a parabolic reflector 10 acts as focus means and has a reflector axis 10a and a focal point 11.
  • a parabolic feeder 10 acts as focus means and has a reflector axis 10a and a focal point 11.
  • Each of the helical feeders 12 has a director disk 13a, 13b respectively.
  • Signals received by the feeders 12 are led via feeder lines 14a, 14b respectively, which may be e.g. coaxial cables, semi-rigid cables or thelike, to circuit boards which are included in a housing 15 and which cannot be seen in Fig. 1.
  • each of the feeders 22 has a director disk 23a, 23b respectively.
  • the diameter dl of the director disks 13, 23 is about 0, 25 * La, wherein La is the wavelength of the radiation to be received.
  • the diameter d2 of the helices 12, 22 is about 0,3 * La
  • the distance d3 between the centers of two helices 12a, 12b or 22a, 22b respectively of the same pair is about 0,7 * La.
  • the housing 15 is shaped like a tube with a round basic form having a diameter d4 of about 0,8 * La.
  • the helices 12 or 22 respectively are placed symmetrically on either side of the focal point 11 in such way that the center of the segment F-F' or f-f' respectively is coincident with the focal point 11 of the concentration means 10.
  • the input powers of each sens of polarization are added inside the housing 15 using an according power combiner.
  • a preferred embodiment of such a power combiner is shown just for one polarization sense in fig. 3.
  • There the inner conductors of the feeder lines 14 are led to microstrip lines 16a, 16b respectively which have a common junction point 17.
  • a resulting outline 18 is led to further stages (not shown) of a low noise converter (LNC). If the signal to be received is a television-broadcast signal, the information of the signals can be presented by an according TV-set.
  • LNC low noise converter
  • two LNC circuit boards can be provided which could be orthogonal to each other, e.g. such that they build a cross, a "T" or thelike, and they are enclosed in the housing 15 which may be shaped like a tube, with a round, a triangular, a quadrangular basic form or thelike.

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Aerials With Secondary Devices (AREA)
  • Radar Systems Or Details Thereof (AREA)

Claims (2)

  1. Antennensystem mit Fokussiermitteln (10) und wendelförmigen Speiseleitern (11), das in dem Axial-Rückstrahl-Modus arbeitet, mit einer ersten Gruppe von zwei oder mehreren wendelförmigen Speiseleitern (12) für den Empfang einer ersten Polarisationsrichtung und einer zweiten Gruppe von zwei oder mehreren wendelförmigen Speiseleitern (22) für den Empfang einer zweiten Polarisationsrichtung, wobei die erste Gruppe von wendelförmigen Speiseleitern eine gegenüber der zweiten Gruppe entgegengesetzte Wicklungsrichtung aufweist und wobei die Speiseleiter so angeordnet sind, daß der Mittelpunkt der Phasenmittelpunkte (F; f) jeder Gruppe der wendelförmigen Speiseleiter (12, 22) mit dem Brennpunkt (11) der Fokussiermittel (10) zusammenfällt.
  2. Antennensystem nach Anspruch 1,
    dadurch gekennzeichnet, daß für die Verarbeitung der Signale in jeder zu empfangenden Polarisation eine Schaltungsplatte vorgesehen ist und daß diese Schaltungsplatten senkrecht zueinander stehen.
EP94904615A 1992-12-30 1993-12-30 Wendelantennensystem Expired - Lifetime EP0677212B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP94904615A EP0677212B1 (de) 1992-12-30 1993-12-30 Wendelantennensystem

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP92403593 1992-12-30
EP92403593 1992-12-30
PCT/EP1993/003726 WO1994016472A1 (en) 1992-12-30 1993-12-30 Helical antenna system
EP94904615A EP0677212B1 (de) 1992-12-30 1993-12-30 Wendelantennensystem

Publications (2)

Publication Number Publication Date
EP0677212A1 EP0677212A1 (de) 1995-10-18
EP0677212B1 true EP0677212B1 (de) 1997-12-10

Family

ID=8211740

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94904615A Expired - Lifetime EP0677212B1 (de) 1992-12-30 1993-12-30 Wendelantennensystem

Country Status (6)

Country Link
EP (1) EP0677212B1 (de)
JP (1) JP3334134B2 (de)
KR (1) KR100300937B1 (de)
DE (1) DE69315707T2 (de)
ES (1) ES2111903T3 (de)
WO (1) WO1994016472A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2157139A1 (en) * 1994-09-01 1996-03-02 Thomas C. Weakley Multiple beam antenna system for simultaneously receiving multiple satellite signals
US6121939A (en) 1996-11-15 2000-09-19 Yagi Antenna Co., Ltd. Multibeam antenna
US6107897A (en) * 1998-01-08 2000-08-22 E*Star, Inc. Orthogonal mode junction (OMJ) for use in antenna system
US6160520A (en) * 1998-01-08 2000-12-12 E★Star, Inc. Distributed bifocal abbe-sine for wide-angle multi-beam and scanning antenna system
KR20110006953A (ko) * 2009-07-15 2011-01-21 위월드 주식회사 역중앙 급전방식의 헬릭스 급전 광대역 안테나

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1570700A (de) * 1968-04-24 1969-06-13
JPS5945283B2 (ja) * 1977-09-01 1984-11-05 三菱電機株式会社 パラボラアンテナ
JPS6437107A (en) * 1987-07-31 1989-02-07 Sharp Kk Antenna system
FR2653941B1 (fr) * 1989-10-31 1992-02-28 Thomson Lgt Antenne de reception multifocale a direction de pointage unique pour plusieurs satellites.
JPH1037107A (ja) * 1996-07-22 1998-02-10 Kensetsu Kiso Eng Co Ltd 吊り道路

Also Published As

Publication number Publication date
JPH08506701A (ja) 1996-07-16
DE69315707T2 (de) 1998-04-02
WO1994016472A1 (en) 1994-07-21
KR960700537A (ko) 1996-01-20
ES2111903T3 (es) 1998-03-16
EP0677212A1 (de) 1995-10-18
JP3334134B2 (ja) 2002-10-15
DE69315707D1 (de) 1998-01-22
KR100300937B1 (ko) 2001-10-22

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