EP0000305A1 - Antenne à faible niveau de lobes secondaires et à grande pureté de polarisation - Google Patents

Antenne à faible niveau de lobes secondaires et à grande pureté de polarisation Download PDF

Info

Publication number
EP0000305A1
EP0000305A1 EP78400024A EP78400024A EP0000305A1 EP 0000305 A1 EP0000305 A1 EP 0000305A1 EP 78400024 A EP78400024 A EP 78400024A EP 78400024 A EP78400024 A EP 78400024A EP 0000305 A1 EP0000305 A1 EP 0000305A1
Authority
EP
European Patent Office
Prior art keywords
lens
antenna
horn
reflector
solid
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Withdrawn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
EP78400024A
Other languages
German (de)
English (en)
French (fr)
Inventor
Nhu Bui Hai
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 EP0000305A1 publication Critical patent/EP0000305A1/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
    • H01Q17/001—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems for modifying the directional characteristic of an aerial
    • 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
    • H01Q19/06—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 refracting or diffracting devices, e.g. lens
    • H01Q19/062—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 refracting or diffracting devices, e.g. lens for focusing
    • 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
    • H01Q19/104—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 using a substantially flat reflector for deflecting the radiated beam, e.g. periscopic antennas

Definitions

  • the present invention relates to an antenna with large angular decoupling and high polarization purity.
  • lens antennas are part of the satellite dishes; the lens is mainly used to compensate for the phase shift in the opening of the horn which illuminates the reflector, in the form of a paraboloid, of the antenna.
  • the parabolic antenna of which this lens is a part has the drawbacks of secondary lobes and masks mentioned above.
  • lens antennas are antennas in which the lens radiates directly into space; the lens is then made of artificial dielectric, that is to say that it is made, for example, of plates with holes or of metallic lamellae and that it is not isotropic.
  • a horn radiates a spherical wave; this horn is placed at the focal point of the lens which it illuminates and the direction of its maximum radiation is coincident with the axis of the lens.
  • This type of antenna does not have a mask effect but their longitudinal bulk is often very important because the focal length of the lens is generally long so as to reduce the thickness of the lens; this drawback is, of course, all the more marked as the radiating reopening of the antenna is greater.
  • the lenses used are not isotropic, it is not possible, with orthogonal rectilinear polarizations, to keep good decoupling at these polarizations after passing through the lens.
  • the present intention aims to reduce the aforementioned drawbacks.
  • an antenna with large angular decoupling and high polarization purity is characterized in that it comprises a radioelectric lens, a horn offset from the axis of the lens and a solid and flat reflector arranged for give the horn an image substantially located at the focal point of the lens and in that the lens is an isotropic lens and the reflector is a solid reflector.
  • antennas comprising a lens, one or more first horns substantially located at the focal point of the lens, one or more second horns offset with respect to the axis of the lens and a plane reflector giving second horns a sensi image clearly located at the focal point of the lens;
  • this reflector arranged between the lens and the first horns is a polarized reflector which, depending on a suitable choice of the polarizations of the first and second horns, is transparent to the waves relating to the first horns and reflective for the waves relating to the second horns.
  • Such antennas by the very fact of the use of polarized reflectors which degrade the purity of polarization, do not make it possible to obtain a large angular decoupling and a high purity of polarization.
  • the polarized reflectors are most often made of a plurality of wires, generally arranged in a plane and are not solid reflectors, radio-electrically speaking, since they allow part of the waves to pass radioelectric.
  • the reflectors having a continuous reflecting surface will be called solid reflectors.
  • Figure 1 shows a radio lens 1 and a horn 2 which radiates a spherical wave.
  • the wave emitted by the horn 2 lights up a solid, metallic, planar reflector 3, and, after reflection on this reflector, lights up the lens 1.
  • the path F'ABCD of a ray coming from the horn 2 has been indicated on the figure.
  • the lens 1 is a converging lens with an optical axis XX of focus F.
  • Point F ' where the Cornet 2, is the symmetric of the focal point F with respect to the reflecting plane of the solid reflector 3.
  • the spherical wave emitted by the horn 2 After passing through the lens 1, the spherical wave emitted by the horn 2 is transformed into a plane wave since, for the lens, it seems to come from the focal point F.
  • the assembly of FIG. 1 has a maximum overall length much lower in the horizontal plane.
  • FIG. 2 shows an exemplary embodiment of an antenna according to the invention.
  • FIG. 2 shows an antenna of the type shown in FIG. 1 with its lens 1, its solid, metallic reflector, plane 3 and its horn 2.
  • the horn is placed in the high position, that is to say that it is situated above the reflector 3 and not below it as in FIG. 1.
  • the metal wall, 5, surrounds the antenna, from the horn to the periphery of the lens and extends a little beyond the lens.
  • This metal envelope 5 substantially follows the contours of the beam, not shown, emitted by the horn 2, reflected by the solid reflector 3 and transmitted by the lens 1; this metal wall ensures the assembly of the horn, the reflector and the lens; it also constitutes a protective screen against external parasitic radiation and makes it possible to reduce the level of parasitic lobes of the antenna.
  • This metal wall is lined in the vicinity of the horn and in its lower part, between the reflector 3 and the lens 1, with a microwave absorbent, 7, 8 which also contributes to the reduction of the secondary lobes of the antenna.
  • a radome 6, fixed to the metal wall 5, can be placed in front of the radiating opening of the antenna as shown in FIG. 2.
  • Lens 1 is a stepped lens (zoned lens in the English literature) with an isotropic dielectric of the charged polyethylene type, with a refractive index equal to 2.3. This lens is covered on both sides with a layer of dielectric foam, 10, with a refractive index equal to 1.5.
  • the dielectric layer of average thickness substantially equal to ⁇ m / 4, where ⁇ m is the average wavelength of use of the antenna, serves to adapt the lens to the propagation medium; in the case of the example described where the average frequency of use is 11.2 GHz, the thickness of the dielectric foam layer is 5.5 mm.
  • the fixing device 9 is formed of tubes.
  • the set of adjustment cylinders such as 41 makes it possible to adjust the direction of the maximum radiation of the antenna by ⁇ 5 ° in elevation and in azimuth.
  • This antenna is intended to operate in the frequency band from 10.7 to 11.7 GHz, simultaneously in vertical polarization and in horizontal polarization and simultaneously in transmission and reception according to the CCIR frequency plans.
  • the antennas according to the invention are not limited to the two examples described.
  • the antenna can comprise different horns all located in the vicinity of an image F '(see FIG. 1) which is given by a reflector of the focal point of a lens. This makes it possible to simultaneously obtain, with the same lens, several directions of propagation with a slight reduction in performance.
  • metal wall 5 it is also possible to replace the metal wall 5 with a wall made of another material, for example metallized fiberglass.
  • the antennas described were antennas used in transmission; it is understood that, due to the principle of the reversibility of electromagnetic waves, the present invention also applies to the case of these same antennas used in reception.

Landscapes

  • Aerials With Secondary Devices (AREA)
  • Waveguide Aerials (AREA)
EP78400024A 1977-06-28 1978-06-16 Antenne à faible niveau de lobes secondaires et à grande pureté de polarisation Withdrawn EP0000305A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7719822A FR2396435A1 (fr) 1977-06-28 1977-06-28 Antenne a grand decouplage angulaire et a grande purete de polarisation
FR7719822 1977-06-28

Publications (1)

Publication Number Publication Date
EP0000305A1 true EP0000305A1 (fr) 1979-01-10

Family

ID=9192677

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78400024A Withdrawn EP0000305A1 (fr) 1977-06-28 1978-06-16 Antenne à faible niveau de lobes secondaires et à grande pureté de polarisation

Country Status (4)

Country Link
EP (1) EP0000305A1 (enrdf_load_stackoverflow)
JP (1) JPS5411654A (enrdf_load_stackoverflow)
FR (1) FR2396435A1 (enrdf_load_stackoverflow)
IT (1) IT1105372B (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0066455A1 (en) * 1981-05-26 1982-12-08 Andrew Corporation Reflector-type microwave antennas with absorber lined conical feed
EP0140598A1 (en) * 1983-10-17 1985-05-08 Andrew Corporation Horn-reflector microwave antennas with absorber lined conical feed
WO1985004527A1 (en) * 1984-04-02 1985-10-10 Gabriel Electronics Incorporated Horn reflector antenna with absorber lined conical feed
WO2013127567A1 (de) * 2012-02-27 2013-09-06 Robert Bosch Gmbh Radarsensor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4762944B2 (ja) 2007-03-26 2011-08-31 浜松ホトニクス株式会社 テラヘルツアンテナモジュール

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR955838A (enrdf_load_stackoverflow) * 1950-01-20
FR1098286A (fr) * 1953-03-06 1955-07-21 Marconi Wireless Telegraph Co Perfectionnements aux systèmes aériens à faisceaux multiples
GB767531A (en) * 1954-06-09 1957-02-06 Marconi Wireless Telegraph Co Improvements in or relating to polarised radio mirrors
FR1150023A (fr) * 1956-04-24 1958-01-06 Antenne directive à polarisation circulaire
US3761935A (en) * 1972-03-06 1973-09-25 Republic Electronic Ind Inc Wide angle microwave scanning antenna array with distortion correction means

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1100098B (de) * 1957-03-22 1961-02-23 Telefunken Gmbh Flaechenstrahler zur Ausstrahlung und zum Empfang elektromagnetischer Wellen mehrerer weit auseinander-liegender Frequenzbaender

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR955838A (enrdf_load_stackoverflow) * 1950-01-20
FR1098286A (fr) * 1953-03-06 1955-07-21 Marconi Wireless Telegraph Co Perfectionnements aux systèmes aériens à faisceaux multiples
GB767531A (en) * 1954-06-09 1957-02-06 Marconi Wireless Telegraph Co Improvements in or relating to polarised radio mirrors
FR1150023A (fr) * 1956-04-24 1958-01-06 Antenne directive à polarisation circulaire
US3761935A (en) * 1972-03-06 1973-09-25 Republic Electronic Ind Inc Wide angle microwave scanning antenna array with distortion correction means

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, vol. AP-23, nr. 6, november 19 75, New York, H.P.COLEMAN et al. "Paraboloïdal reflector off-set fed with a corrugated conical horn", pages 817-819. *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0066455A1 (en) * 1981-05-26 1982-12-08 Andrew Corporation Reflector-type microwave antennas with absorber lined conical feed
EP0140598A1 (en) * 1983-10-17 1985-05-08 Andrew Corporation Horn-reflector microwave antennas with absorber lined conical feed
WO1985004527A1 (en) * 1984-04-02 1985-10-10 Gabriel Electronics Incorporated Horn reflector antenna with absorber lined conical feed
AU580997B2 (en) * 1984-04-02 1989-02-09 Gabriel Electronics Incorporated Horn reflector antenna with absorber lined conical feed
US5317328A (en) * 1984-04-02 1994-05-31 Gabriel Electronics Incorporated Horn reflector antenna with absorber lined conical feed
WO2013127567A1 (de) * 2012-02-27 2013-09-06 Robert Bosch Gmbh Radarsensor
US9768517B2 (en) 2012-02-27 2017-09-19 Robert Bosch Gmbh Radar sensor

Also Published As

Publication number Publication date
FR2396435A1 (fr) 1979-01-26
IT7850062A0 (it) 1978-06-27
JPS5411654A (en) 1979-01-27
FR2396435B1 (enrdf_load_stackoverflow) 1981-06-26
IT1105372B (it) 1985-10-28

Similar Documents

Publication Publication Date Title
CA2243603C (fr) Structure rayonnante
US8937577B2 (en) Substrate lens antenna device
EP0045682B1 (fr) Transducteur d'antenne pour antenne d'émission-réception
FR2843238A1 (fr) Antenne multisources notamment pour un systeme a reflecteur
EP1568104B1 (fr) Antenne multi-faisceaux a materiau bip
WO2000014825A9 (fr) Antenne
EP3844844A1 (fr) Antenne pour emettre et/ou recevoir une onde electromagnetique, et systeme comprenant cette antenne
EP0170154A1 (fr) Antenne bi-fréquence à même couverture de zone à polarisation croisée pour satellites de télécommunications
EP0000305A1 (fr) Antenne à faible niveau de lobes secondaires et à grande pureté de polarisation
CH623171A5 (enrdf_load_stackoverflow)
EP0045254B1 (fr) Source rayonnante bi-bande compacte fonctionnant dans le domaine des hyperfréquences
EP1554777A1 (fr) Antenne a materiau bip multi-faisceaux
FR2518828A1 (fr) Filtre spatial de frequences et antenne comportant un tel filtre
CN110739547A (zh) 一种卡塞格伦天线
CA1314972C (fr) Antenne a reflecteur de revolution
CN1922765B (zh) 无线电波透镜天线装置
FR2590081A1 (fr) Antenne a reflecteurs a grilles polarisees lineairement avec de meilleures performances de polarisation transversale
EP4046241A1 (fr) Antenne-reseau
EP3155689B1 (fr) Antenne plate de telecommunication par satellite
FR2671235A1 (fr) Antenne offset avec radome.
US20240388004A1 (en) Systems and methods for mitigating interference from satellite gateway antenna
FR2909225A1 (fr) Dispositif d'alimentation d'une antenne a reflecteur
FR2637130A1 (fr) Antenne a optique cassegrain a haut rendement
KR19990000865U (ko) 파라볼라 안테나
FR2854734A1 (fr) Systeme d'emission et ou de reception d'ondes electromagnetiques equipe d'une antenne multi-faisceaux a materiau bip

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE GB NL

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn
RIN1 Information on inventor provided before grant (corrected)

Inventor name: BUI HAI, NHU