EP0429338A1 - Zirkular polarisierte Antenne, insbesondere für Gruppenstrahlerantennen - Google Patents

Zirkular polarisierte Antenne, insbesondere für Gruppenstrahlerantennen Download PDF

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Publication number
EP0429338A1
EP0429338A1 EP90403208A EP90403208A EP0429338A1 EP 0429338 A1 EP0429338 A1 EP 0429338A1 EP 90403208 A EP90403208 A EP 90403208A EP 90403208 A EP90403208 A EP 90403208A EP 0429338 A1 EP0429338 A1 EP 0429338A1
Authority
EP
European Patent Office
Prior art keywords
antenna
quarter
branches
wave
radiating element
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Withdrawn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
EP90403208A
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English (en)
French (fr)
Inventor
Jean Bouko
Marcel Grosbois
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 EP0429338A1 publication Critical patent/EP0429338A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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 a circularly polarized antenna, in particular an elementary antenna for an antenna array.
  • circular polarization in particular in radar applications, where it is known that circular polarization makes it possible to eliminate the echoes produced by obstacles with isotropic reflection, quite particularly the echoes of rain (caused by water droplets suspended in the clouds).
  • the wave emitted according to a given circular polarization for example a right circular polarization
  • a reverse polarization circular to the left in this example.
  • it will then be easy, at the level of the receiver, to suppress this reflection by means of a cross polarization eliminator.
  • One of the aims of the invention is to propose such an antenna with circular polarization, in particular to serve as a primary source (elementary antenna) in a network antenna, and which can be supplied directly by a line called "triplate”.
  • a three-ply line is formed by a flat central conductor forming a coaxial core, sandwiched between two thicknesses of dielectric (possibly air) themselves covered on their outer surfaces by conductors located in line with the central conductor and supplied in parallel , therefore equipotential, forming peripheral earth conductors.
  • the known primary sources with circular polarization do not operate in the same mode as the triplate line and therefore require, in addition to the mechanical and electrical interfacing of the source to the line triplate, a change in excitation mode detrimental to optimal operation of the source.
  • the radiating elements produced up to now in triplate technology did not provide circular polarization, and it was therefore necessary, in order to obtain such a polarization mode, to add to them polarizers such as polarizers with dielectric plates, with screws , with wires, etc., with all the corresponding losses of adaptation and difficulties of realization.
  • the object of the present invention is to propose a new form of primary source with circular polarization which can directly extend the three-plate feed line, generally constituted by one of the ramifications of a network antenna distributor.
  • the invention consists in extending the supply line by two orthogonal triplate dipoles and a phase shifter inserted between the two dipoles, so as to create a monobloc primary source radiating a circularly polarized wave (we indeed know that, to produce a circularly polarized wave, two neighboring orthogonal dipoles should be excited by signals of the same amplitude but in quadrature).
  • the antenna of the invention which is excited by a triplate supply line comprising two peripheral conductors disposed respectively above and above below a central conductor, comprises, at the end of this triplate supply line: - A first dipolar radiating element, comprising two quarter wave branches formed by extending in their plane, in transverse direction and in the same direction, each of the peripheral conductors, and a quarter wave branch formed by extending in its plane, parallel to the two aforementioned branches but in the opposite direction, the central conductor, - A second dipolar radiating element, orthogonal to the first, comprising two quarter-wave branches formed by folding, in opposite directions, the central conductor and one of the peripheral conductors, these two branches being coplanar and coaxial and extending perpendicular to the planes of the conductors, and - distributor and phase shifter means, to excite the dipole radiating elements by respective similar signals, of the same amplitude but 90 ° out of phase.
  • the distributing and phase-shifting means are constituted by a quarter wave axial segment of triplate line, this triplate line segment extending the triplate supply line beyond the first dipolar radiating element, the branches of the second dipolar radiating element being formed at the end of this triplate line segment, and the dimensions of this triplate line segment and the specific characteristics of its dielectric being chosen so as to excite the dipole radiating elements by respective respective signals, of the same amplitude but phase shifted 90 °.
  • the antenna further comprises a plane polarization filter, for example a network of wires, interposed between the dipolar radiating elements and extending parallel to them.
  • the network of wires can in particular be arranged against the inner face of a radome), the parts of the antenna situated in front of this network of wires being embedded in the wall of this radome.
  • the reference 1 designates the three-plate supply line, consisting of a central conductor 2 sandwiched between two peripheral conductors 3.3 ′, forming half ground planes; these three conductors are produced in the form of rigid plates or strips arranged parallel to each other and separated by an appropriate dielectric (which may be air, spacings then being simply provided to precisely maintain the various elements of the line in their place).
  • an appropriate dielectric which may be air, spacings then being simply provided to precisely maintain the various elements of the line in their place).
  • the triplate line may in particular constitute the end of one of the ramifications of a network antenna distributor (not shown), this end crossing a ground plane 4 with the interposition of an isolator 5 further ensuring the mechanical maintenance and positioning of the supply line.
  • This supply line firstly excites a first horizontal dipole 10, intended to produce the horizontal component of the circular polarization of the wave.
  • the antenna of the invention is described here essentially in the form of a source emitting a circularly polarized wave, this same antenna can also be used, due to the principle of reciprocity , in as a receiving antenna, without any modification.
  • the horizontal dipole 10 is produced by extending transversely (that is to say perpendicular to the general direction, materialized by the axis ⁇ , of the triplate line) the peripheral conductors 3, 3 ′ of the supply line by respective branches 11, 11 ′), on a first side (the same for the two branches 11 and 11 ′) of the axis ⁇ .
  • the other part of the dipole is constituted by a branch 12 formed by extending transversely, but on the other side of the axis ⁇ , the central conductor of the supply line. It is possible to provide, between the branches 11 and 11 ′, a low-loss dielectric 13 making it possible in particular to ensure the mechanical rigidity of the assembly.
  • the branches 11, 11 ′ and 12 are of the same length, equal to about a quarter wave (the wavelength being, of course, considered in the dielectric).
  • the metallic ground plane 4 plays the role of short-circuit plane for the horizontal dipole 10.
  • triplate line is then extended axially over a length of approximately a quarter wave (the role played by this section will be explained below) then, at the end of this extended line, a second, vertical dipole 20 is formed intended for produce the vertical component of the circularly polarized wave.
  • This dipole 20 is formed by folding the central conductor 2 downwards, which gives the branch 21, and one of the peripheral conductors (here, the upper conductor 3) upwards, which gives the second branch 22 of the dipole 20
  • These two branches 21 and 22 also have a length of around a quarter wave.
  • the part of the line separating the two dipoles, referenced 30, will serve as a phase shifter making it possible to feed the respective two dipoles in quadrature.
  • this dielectric 33, 33 ′ a material with low losses will be chosen, in order to have the best possible power handling for the source thus formed.
  • the relative dimensions of the different parts of the line are chosen so as to obtain, in a manner known per se, a halving of the radioelectric energy at the point of the excitation point of the horizontal dipole .
  • We will thus have two orthogonal components of the same amplitude to achieve the desired circular polarization.
  • the antenna comprises, at a quarter wave behind the vertical dipole 20, a network of wires 40 which performs two essential functions: first of all, it constitutes the short-circuit plane of the vertical dipole 20, since the wires of the network 40 are parallel to the orientation of this dipole, and - It acts as a cross polarization filter (in particular for reception) for the horizontal dipole 10, so that the wave emitted or received by the latter is as linearly polarized as possible in the horizontal direction.
  • the array of wires 40 can be mounted on the rear face of a radome 41, for example a radome formed from a light foam in which the vertical dipoles 20 of the antenna array will be embedded.
  • a radome 41 for example a radome formed from a light foam in which the vertical dipoles 20 of the antenna array will be embedded.
  • the radome and the frame are kept at a precise distance from the ground plane 4 by means of spacers 42.

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Details Of Aerials (AREA)
  • Aerials With Secondary Devices (AREA)
EP90403208A 1989-11-24 1990-11-13 Zirkular polarisierte Antenne, insbesondere für Gruppenstrahlerantennen Withdrawn EP0429338A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8915473 1989-11-24
FR8915473A FR2655201B1 (fr) 1989-11-24 1989-11-24 Antenne a polarisation circulaire, notamment pour reseau d'antennes.

Publications (1)

Publication Number Publication Date
EP0429338A1 true EP0429338A1 (de) 1991-05-29

Family

ID=9387749

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90403208A Withdrawn EP0429338A1 (de) 1989-11-24 1990-11-13 Zirkular polarisierte Antenne, insbesondere für Gruppenstrahlerantennen

Country Status (5)

Country Link
US (1) US5172129A (de)
EP (1) EP0429338A1 (de)
JP (1) JPH03175802A (de)
CA (1) CA2029380A1 (de)
FR (1) FR2655201B1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6052889A (en) * 1996-11-21 2000-04-25 Raytheon Company Radio frequency antenna and its fabrication
US20030048226A1 (en) * 2001-01-31 2003-03-13 Tantivy Communications, Inc. Antenna for array applications
WO2013141923A2 (en) * 2011-12-20 2013-09-26 Sadar 3D, Inc. Scanners, targets, and methods for surveying
US9577341B2 (en) * 2013-11-12 2017-02-21 Harris Corporation Microcellular communications antenna and associated methods

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1416343A (en) * 1972-02-16 1975-12-03 Secr Defence Radomes
GB2048571A (en) * 1979-05-03 1980-12-10 Marconi Co Ltd Circularly polarised antenna array
EP0156684A1 (de) * 1984-02-24 1985-10-02 Thomson-Csf Strahlendes Mirkowellenelement und seine Anwendung in einer elektronisch gesteuerten Antenne
GB2191044A (en) * 1986-05-28 1987-12-02 Gen Electric Co Plc Antenna arrangement
US4772890A (en) * 1985-03-05 1988-09-20 Sperry Corporation Multi-band planar antenna array
GB2207005A (en) * 1987-07-15 1989-01-18 Gen Electric Co Plc Antenna
GB2211024A (en) * 1987-10-10 1989-06-21 Gen Electric Co Plc Antennas

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2594260B1 (fr) * 1981-05-22 1989-01-13 Thomson Csf Source primaire hyperfrequence pour antenne a balayage conique et antenne l'incorporant.

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1416343A (en) * 1972-02-16 1975-12-03 Secr Defence Radomes
GB2048571A (en) * 1979-05-03 1980-12-10 Marconi Co Ltd Circularly polarised antenna array
EP0156684A1 (de) * 1984-02-24 1985-10-02 Thomson-Csf Strahlendes Mirkowellenelement und seine Anwendung in einer elektronisch gesteuerten Antenne
US4772890A (en) * 1985-03-05 1988-09-20 Sperry Corporation Multi-band planar antenna array
GB2191044A (en) * 1986-05-28 1987-12-02 Gen Electric Co Plc Antenna arrangement
GB2207005A (en) * 1987-07-15 1989-01-18 Gen Electric Co Plc Antenna
GB2211024A (en) * 1987-10-10 1989-06-21 Gen Electric Co Plc Antennas

Also Published As

Publication number Publication date
FR2655201A1 (fr) 1991-05-31
US5172129A (en) 1992-12-15
FR2655201B1 (fr) 1992-06-19
JPH03175802A (ja) 1991-07-30
CA2029380A1 (fr) 1991-05-25

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