EP0027067B1 - Antenne plane bifilaire à rayonnement transversal et son application aux aériens radars - Google Patents

Antenne plane bifilaire à rayonnement transversal et son application aux aériens radars Download PDF

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Publication number
EP0027067B1
EP0027067B1 EP19800401320 EP80401320A EP0027067B1 EP 0027067 B1 EP0027067 B1 EP 0027067B1 EP 19800401320 EP19800401320 EP 19800401320 EP 80401320 A EP80401320 A EP 80401320A EP 0027067 B1 EP0027067 B1 EP 0027067B1
Authority
EP
European Patent Office
Prior art keywords
line
conducting
plane
wire
elements
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
Application number
EP19800401320
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0027067A1 (fr
Inventor
Jean Rannou
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.)
Thales SA
Original Assignee
Thomson CSF 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 CSF SA filed Critical Thomson CSF SA
Publication of EP0027067A1 publication Critical patent/EP0027067A1/fr
Application granted granted Critical
Publication of EP0027067B1 publication Critical patent/EP0027067B1/fr
Expired legal-status Critical Current

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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
    • H01Q11/04—Non-resonant antennas, e.g. travelling-wave antenna with parts bent, folded, shaped, screened or electrically loaded to obtain desired phase relation of radiation from selected sections of the antenna
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/20—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/206—Microstrip transmission line antennas

Definitions

  • the invention relates to a flat two-wire antenna with transverse radiation and its application to radars overhead.
  • Antennas which meet these conditions at least partially are known in the prior art, which proposes either antennas of the equiangular spiral type wound on a cone, or of the log-periodic type or else, as in the American patent US-A-3 249 946 in the name of ER Flanagan, an antenna comprising a conductive line having folds inscribed in an envelope made up of two intersecting lines. In this last antenna, the phase center is mobile.
  • the above-mentioned antennas although having some of the conditions required, do not have transverse radiation making it possible to produce an antenna which can be accommodated in thin volumes.
  • planar antennas with double spiral nested have proposed planar antennas with double spiral nested; but this type of antenna, although broadband in frequency, has a fixed phase center relative to the wavelength used.
  • the present invention aims to define a two-wire planar antenna having all the conditions mentioned above and the radiation of which is in a transverse direction.
  • the flat two-wire antenna with transverse radiation comprises two conductive lines arranged on two planes parallel symmetrically with respect to the median plane and each having N folds whose envelope is defined by straight lines forming an angle of value a predetermined constant, these two conductive lines differing only by a variation in the electrical length of the same conductive line at the folds, so that two elements of conductive lines belonging to the two planes and delimited by two folds successive are traversed by a phase current for the wavelength used.
  • a two-wire line whose conductors are sufficiently close to each other has a very weak radiation because the conductors being traversed by a current in phase opposition, their respective radiations cancel each other out.
  • This method is used to create the radiation of the antenna object of the invention.
  • Figures 1 and 2 show a first embodiment of an antenna according to the invention seen in perspective and front view. It comprises a dielectric plate 10 limited by two planes P and P 2 , the thickness of which is small, and on which are fixed on either side, and respectively, two conductive metal lines 1 and 2, for example by etching according to the known technique of printed circuits; these lines have N folds which are arranged so as to be inscribed in an opening angle ⁇ .
  • FIG. 2 shows a possible geometry of the folds which here are such that they only have right angles and thus delimit elements of straight conductive lines, parallel and equidistant from each other.
  • one of the conductive lines 2 is extended by a length 11.1 relative to the other conductive line 1 at each folding.
  • ⁇ is not critical since, in combination with the distance d between two consecutive elements of the same conductive line, it only determines the interval ⁇ of wavelength between the maximum radiations.
  • a and d are as low as possible, which of course increases the size of the antenna and its difficulty of realization.
  • the value given to d is in any case limited below by the coupling phenomena between the elements of neighboring lines.
  • FIG. 3 shows a second embodiment of an antenna according to the invention for which the distance between two successive elements of the same conductive line varies in proportion to the distance of these line elements at the feed point 0.
  • This variant in the geometry of the folds implies that the variations ⁇ 1 of each fold are proportional to the distance from the feed point 0 of the antenna.
  • An elementary antenna as described above can be used for very wide frequency transmission and / or reception of a rectilinear polarized wave, for example in an electromagnetic detection device.
  • the combination of at least two of these antennas can be used as an aerial deviation meter; the phase difference between the signals received by two neighboring antennas is then measured, these being able to be supplied either in phase or in phase opposition as shown in FIGS. 7 and 8.
  • Arrays of several antennas of this type can be done in many different ways. For a couple of two antennas, it is possible, for example, to arrange them on the same plane and symmetrically with respect to a point or with respect to a straight line of this same plane as shown in the examples corresponding to FIGS. 7 and 8.
  • a plane 11 reflecting the electromagnetic waves such as for example a metal plate, can be placed either parallel to this antenna at a distance close to ⁇ M / 4 where ⁇ M is the length mean wave of the antenna, either passing through the point 0 and making an angle ⁇ so that each conductive line element of order 1 is situated relative to the reflecting plane, at a distance equal to half the length electric Ai / 2 of the element considered ⁇ 'order i, that is to say at a distance ⁇ i / 4 measured parallel to the direction of radiation, where ⁇ i is the wavelength corresponding to the resonance of this line element.
  • a dielectric plate 12 of suitable index and thickness is fixed on one of the two lines 2 and covering it totally or partially so as to obtain an effect similar to the geometric elongation of one of the two conducting lines .
  • the dielectric plate then completely covers one face of the antenna so as to create an electrical elongation ⁇ 1 varying proportionally to the length of the conductive line.
  • the dielectric plate occupies only two angular sectors delimited by angles ⁇ " ⁇ ⁇ of vertex 0 and adjacent to the sides of the angle ⁇ .
  • a two-wire planar antenna with transverse radiation has thus been described, and its application to radar aerials.

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Aerials With Secondary Devices (AREA)
EP19800401320 1979-10-05 1980-09-16 Antenne plane bifilaire à rayonnement transversal et son application aux aériens radars Expired EP0027067B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7924897 1979-10-05
FR7924897A FR2466879A1 (fr) 1979-10-05 1979-10-05 Antenne plane bifilaire a rayonnement transversal et son application aux aeriens radars

Publications (2)

Publication Number Publication Date
EP0027067A1 EP0027067A1 (fr) 1981-04-15
EP0027067B1 true EP0027067B1 (fr) 1984-07-18

Family

ID=9230390

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800401320 Expired EP0027067B1 (fr) 1979-10-05 1980-09-16 Antenne plane bifilaire à rayonnement transversal et son application aux aériens radars

Country Status (3)

Country Link
EP (1) EP0027067B1 (enExample)
DE (1) DE3068607D1 (enExample)
FR (1) FR2466879A1 (enExample)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988004836A1 (en) * 1986-12-18 1988-06-30 John Chun Sing Yip Indoor antenna
WO1993000721A1 (de) * 1991-06-27 1993-01-07 Siemens Aktiengesellschaft Planare mäander-antenne

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2710458B1 (fr) * 1984-11-27 1996-01-26 Thomson Csf Antenne plane bifilaire.

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3013268A (en) * 1959-04-23 1961-12-12 Collins Radio Co Elliptical-polarized logarithmically periodic antenna
US3231894A (en) * 1960-06-23 1966-01-25 Sony Corp Zigzag antenna
FR1331664A (fr) * 1961-07-03 1963-07-05 Marconi Wireless Telegraph Co Perfectionnements aux antennes directives
GB965802A (en) * 1961-11-03 1964-08-06 Marconi Co Ltd Improvements in or relating to aerials
US3249946A (en) * 1963-03-25 1966-05-03 Martin Marietta Corp Frequency independent antenna array with constant phase center spacing
US3530486A (en) * 1968-11-22 1970-09-22 Hughes Aircraft Co Offset-wound spiral antenna
DE2243493A1 (de) * 1972-09-05 1974-03-28 Hans Heinrich Prof Dr Meinke Richtantenne aus mehreren einzelstrahlern

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988004836A1 (en) * 1986-12-18 1988-06-30 John Chun Sing Yip Indoor antenna
WO1993000721A1 (de) * 1991-06-27 1993-01-07 Siemens Aktiengesellschaft Planare mäander-antenne

Also Published As

Publication number Publication date
FR2466879B1 (enExample) 1983-09-16
FR2466879A1 (fr) 1981-04-10
EP0027067A1 (fr) 1981-04-15
DE3068607D1 (en) 1984-08-23

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