EP0337841A1 - Unsymmetrisch gespeiste breitbandige Sendeantennenschleife und Antennenfeld aus einer Vielzahl dieser Schleifen - Google Patents

Unsymmetrisch gespeiste breitbandige Sendeantennenschleife und Antennenfeld aus einer Vielzahl dieser Schleifen Download PDF

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Publication number
EP0337841A1
EP0337841A1 EP89400848A EP89400848A EP0337841A1 EP 0337841 A1 EP0337841 A1 EP 0337841A1 EP 89400848 A EP89400848 A EP 89400848A EP 89400848 A EP89400848 A EP 89400848A EP 0337841 A1 EP0337841 A1 EP 0337841A1
Authority
EP
European Patent Office
Prior art keywords
loop
plane
antenna
plate
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.)
Ceased
Application number
EP89400848A
Other languages
English (en)
French (fr)
Inventor
Jean Bouko
Richard Piglowski
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 EP0337841A1 publication Critical patent/EP0337841A1/de
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength
    • 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
    • H01Q19/108—Combination of a dipole with a plane reflecting surface
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/06—Details

Definitions

  • the present invention relates to a loop type antenna with asymmetrical feed.
  • loop antennas We know the characteristics of loop antennas, especially their wide bandwidth and their relatively open diagram, which makes them used mainly in reception.
  • the loop In most of the cases, the loop is used alone, that is to say without associated reflector, and it is supplied either by a two-wire line whose two conductors terminate at the two ends of the loop (which is not closed on itself), or by a coaxial line, the connection of the loop to the line then being made with the interposition of a balun housing.
  • the loop antennas currently used are ill-suited to use in transmission because of their ROS (Stationary Wave Report) penalizing for the radiated energy.
  • the use of the balun further increases the ROS; moreover, it allows suitable operation only in a relatively narrow frequency band (around the tuning frequency of the balun), which is incompatible with broadband transmission.
  • One of the aims of the present invention is to provide a loop type antenna which can be supplied by a coaxial line, in particular for use in transmission, ensuring excellent adaptation both with regard to the ROS and the radiation pattern. , and this over a relatively wide frequency band.
  • the invention makes it possible to have a suitable radiating source which is simple to produce and of low cost, which optionally makes it possible to multiply the number of antennas so as to form a large array ( "slab” antenna), for large radiated powers.
  • the antenna which is supplied by at least one coaxial line, comprises: - a radiating element in the form of a symmetrical flat loop closed on itself, connected to the core of the coaxial supply line at a point of the loop, a reflective plane extending parallel to the plane of the loop and at a distance therefrom, and - At least one balancing element in the form of a metal plate, arranged between the loop and the reflector and extending parallel to the plane of the loop and to that of the reflector, and of general shape corresponding substantially to that of the part of the loop connected to the core of the coaxial line, this plate being connected to the ground of the coaxial supply line.
  • - Said loop portion is a rectilinear segment, the largest dimension of the rectangular plate being substantially equal to or less than the length of this loop segment located opposite; preferably, the loop is then of substantially square shape; - the length / width ratio of the rectangular plate is at least equal to 4; the distance from the plane of the plate to the plane of the loop is less than one tenth of the wavelength; the ratio between the plane of the plate and the plane of the loop / distance from the plane of the plate to the plane of the reflector is between approximately 1: 5 and 1:10; the distance from the plane of the loop to the plane of the reflector is substantially equal to or less than half a wavelength; - The loop is fed, selectively or simultaneously by a second coaxial line at a second feed point located substantially orthogonally on the loop relative to the first feed point.
  • the invention also relates to a network antenna formed by an ordered grouping of a plurality of antennas having the aforementioned characteristic structure, excited simultaneously, the loop and the plate of each antenna extending above a plane. common reflector.
  • the reference 1 designates the supply line, which is a coaxial line - therefore asymmetrical -, with a central conductor 2 forming the core of the cable and a peripheral conductor 3 forming mass and return conductor.
  • This supply line leads to an antenna which includes a loop 4, a plane reflector 5 and a balancing element 6 in the form of a plate; each of these three elements is plane, and the planes of the three elements are mutually parallel.
  • the loop 4 is preferably square in shape, and fully closed on itself. It is excited by the core 2 of the coaxial line, which is connected at a midpoint on one of the sides of the loop, so as to keep the symmetrical structure specific to loop antennas.
  • a plane reflector 5 is arranged below the antenna; its dimensions are not critical, this reflector ideally extending to infinity.
  • a balancing adapter element is provided, consisting of a metal plate 6 placed between the loop and the reflector, at a short distance from the loop, and connected to earth 3 of the supply line.
  • This plate 6 has the effect of extending the mass of the coaxial line in the form of a ground plane ensuring coupling with the loop, because this plate is located in the close vicinity of one of the sides of the loop; in Figure 1 there is shown by arrows the direction of the field lines between the loop 4 and the reflector 6, thus visually showing how the transition is made between the asymmetric supply and the symmetrical radiating element.
  • the plate 6 has the shape of an elongated rectangular plate extending parallel to one of the sides of the square formed by the loop 4, the length of the plate being of the same order as the length of this side, preferably slightly lower.
  • FIG. 1 shows the respective preferred dimensions of the different elements, all given as a function of the wavelength of the central frequency of the antenna operating band.
  • Figures 2 and 3 give the results of measurements made with an antenna having the characteristics and dimensions indicated in Figure 1.
  • Figure 2 shows the variation of the ROS according to the frequency on the band 1250 - 1450 MHz, and we can see that the ROS always remains lower than 1.5 on the whole band, which allows to use in a way very suitable the antenna of the present invention for broadband transmission (in the case of FIG. 2, the frequency varies over ⁇ 7.5% around the central frequency).
  • FIG. 3 shows the respective radiation diagrams: in the plane containing the electric field (curve E), that is to say in the plane perpendicular to the loop and to the side supplied by the coaxial line (this will be, for example , from the azimuth diagram, the loop and the side supplied by the coaxial line being vertical); in the plane, orthogonal to the previous one, containing the magnetic field (curve H, which would be the diagram in site in the preceding hypothesis); and the diagram corresponding to a cross polarization (curve X).
  • curve E the electric field
  • curve H which would be the diagram in site in the preceding hypothesis
  • curve X the diagram corresponding to a cross polarization
  • the loop is not necessarily square or rectangular; alternatively, it may include a curvilinear part in the vicinity of the excitation point, or even be completely circular as shown in FIG. 4, the plate 6 then being curved to follow the contour of the curvilinear part around the point of excitation.
  • loop 4 can be attacked by a second coaxial 1 ′ situated on the loop at 90 ° relative to the first coaxial 1. It is then provided , as for the first coaxial, a plate 6 ′ forming a balancing element.
  • the two coaxials can be used either selectively (one can then obtain, depending on the coaxial chosen for the excitation, a vertical or horizontal polarization), or simultaneously with phase shift of ⁇ / 2 between the two supply signals of the loop (on can then get circular polarization)

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  • Aerials With Secondary Devices (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
EP89400848A 1988-04-01 1989-03-24 Unsymmetrisch gespeiste breitbandige Sendeantennenschleife und Antennenfeld aus einer Vielzahl dieser Schleifen Ceased EP0337841A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8804389 1988-04-01
FR8804389A FR2629644B1 (fr) 1988-04-01 1988-04-01 Antenne boucle large bande a alimentation dissymetrique, notamment antenne pour emission, et antenne reseau formee d'une pluralite de telles antennes

Publications (1)

Publication Number Publication Date
EP0337841A1 true EP0337841A1 (de) 1989-10-18

Family

ID=9364912

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89400848A Ceased EP0337841A1 (de) 1988-04-01 1989-03-24 Unsymmetrisch gespeiste breitbandige Sendeantennenschleife und Antennenfeld aus einer Vielzahl dieser Schleifen

Country Status (3)

Country Link
US (1) US4987423A (de)
EP (1) EP0337841A1 (de)
FR (1) FR2629644B1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0993019A (ja) * 1995-09-27 1997-04-04 Harada Ind Co Ltd 車両用窓ガラスアンテナ
US5706016A (en) * 1996-03-27 1998-01-06 Harrison, Ii; Frank B. Top loaded antenna
US6911947B1 (en) * 1999-09-08 2005-06-28 Thomson Licensing S.A. Method and apparatus for reducing multipath distortion in a television signal
ATE448584T1 (de) * 2001-01-26 2009-11-15 Agency Science Tech & Res Breitband-aufhängungsplattenantennen mit geringer kreuzpolarisation
KR20040077052A (ko) * 2003-02-27 2004-09-04 한국전자통신연구원 광대역 슬롯 안테나 및 그를 이용한 슬롯 배열 안테나
GB2438245B (en) * 2006-05-18 2010-05-05 Deltenna Ltd Antenna element
TW200830632A (en) * 2007-01-05 2008-07-16 Advanced Connection Tech Inc Circular polarized antenna

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2716191A (en) * 1953-01-16 1955-08-23 Walter E Knoop Antenna
DE2245195A1 (de) * 1971-11-26 1973-05-30 Vorta Systems Inc Antenne
DE2633757A1 (de) * 1975-10-06 1977-04-14 Ball Corp Mehrfachantenne
US4191959A (en) * 1978-07-17 1980-03-04 The United States Of America As Represented By The Secretary Of The Army Microstrip antenna with circular polarization
US4719470A (en) * 1985-05-13 1988-01-12 Ball Corporation Broadband printed circuit antenna with direct feed

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4051477A (en) * 1976-02-17 1977-09-27 Ball Brothers Research Corporation Wide beam microstrip radiator
US4162499A (en) * 1977-10-26 1979-07-24 The United States Of America As Represented By The Secretary Of The Army Flush-mounted piggyback microstrip antenna
JPS57107610A (en) * 1980-12-25 1982-07-05 Nippon Telegr & Teleph Corp <Ntt> Circular polarized wave cone beam antenna
US4554549A (en) * 1983-09-19 1985-11-19 Raytheon Company Microstrip antenna with circular ring

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2716191A (en) * 1953-01-16 1955-08-23 Walter E Knoop Antenna
DE2245195A1 (de) * 1971-11-26 1973-05-30 Vorta Systems Inc Antenne
DE2633757A1 (de) * 1975-10-06 1977-04-14 Ball Corp Mehrfachantenne
US4191959A (en) * 1978-07-17 1980-03-04 The United States Of America As Represented By The Secretary Of The Army Microstrip antenna with circular polarization
US4719470A (en) * 1985-05-13 1988-01-12 Ball Corporation Broadband printed circuit antenna with direct feed

Also Published As

Publication number Publication date
FR2629644B1 (fr) 1991-11-29
US4987423A (en) 1991-01-22
FR2629644A1 (fr) 1989-10-06

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