EP0310414A2 - Linse/Polarisator/Radom - Google Patents

Linse/Polarisator/Radom Download PDF

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Publication number
EP0310414A2
EP0310414A2 EP88309094A EP88309094A EP0310414A2 EP 0310414 A2 EP0310414 A2 EP 0310414A2 EP 88309094 A EP88309094 A EP 88309094A EP 88309094 A EP88309094 A EP 88309094A EP 0310414 A2 EP0310414 A2 EP 0310414A2
Authority
EP
European Patent Office
Prior art keywords
lens
polarizer
dielectric lens
dielectric
radome
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.)
Granted
Application number
EP88309094A
Other languages
English (en)
French (fr)
Other versions
EP0310414A3 (en
EP0310414B1 (de
Inventor
Keith C. Smith
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.)
Raytheon Co
Original Assignee
Raytheon Co
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 Raytheon Co filed Critical Raytheon Co
Publication of EP0310414A2 publication Critical patent/EP0310414A2/de
Publication of EP0310414A3 publication Critical patent/EP0310414A3/en
Application granted granted Critical
Publication of EP0310414B1 publication Critical patent/EP0310414B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
    • H01Q1/425—Housings not intimately mechanically associated with radiating elements, e.g. radome comprising a metallic grid
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/24—Polarising devices; Polarisation filters 
    • H01Q15/242—Polarisation converters
    • H01Q15/244—Polarisation converters converting a linear polarised wave into a circular polarised wave
    • 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

Definitions

  • This invention pertains generally to directive antennas for radio frequency energy, and particularly to a Lens/Polarizer/Radome used in conjunction with other types of antennas.
  • the elements of the contemplated Lens/Polarizer/Radome are mounted within a flanged frame 10 that is dimensioned to permit mounting in any convenient manner on the face of an array antenna 12, here a linear array of sectoral horns (not numbered).
  • the elements of the contemplated Lens/Polarizer/Radome are a dielectric lens 13, a quarter-wave matching element 15, a polarization filter 17 and a polarizer 19.
  • absorbers 21, 23, 24 are provided as shown.
  • the dielectric lens 13 here fabricated from polyethylene having a dielectric constant of approximately 2.3, is shaped to have a first surface 13a complementary in shape to the ends of the sectoral horns (not numbered). To put it another way, first surface 13a is shaped to present nearly an equiphase surface to fields produced by the sectoral horns (not numbered).
  • a second surface 13b of the dielectric lens 13 is shaped to adjust the phase delay of rays passing through the dielectric lens 13 as required to attain a desired distribution across the aperture (not numbered) of the Lens/Polarizer/Radome.
  • the phase delay at any point through the dielectric lens 13 is directly related to the thickness of the dielectric lens and to the square root of the dielectric constant and inversely related to the wavelength of the electromagnetic energy being transmitted or received.
  • the cross-section of the dielectric lens 13 is shaped as shown.
  • the first surface 13a of the dielectric lens 13 need not be concentric with the end of the sectoral horns (not numbered).
  • the dielectric lens 13 be rotated so that the upper end of the first surface 13a is slightly closer to the sectoral horn than the lower end of the first surface 13b.
  • the quarter-wave matching element 15 here is a sheet of foam rubber having a thickness of one-quarter wavelength of electromagnetic energy passing through the dielectric lens 13 in either direction.
  • the dielectric constant of the foam rubber is equal approximately to the square root of the dielectric constant of the polyethylene of the dielectric lens 13.
  • the quarter-wave matching element 15 is affixed with an electrically thin layer of R.F. transparent adhesive to the first and second surfaces 13a, 13b of the dielectric lens 13.
  • the polarization filter 17 and polarizer 19 are used to convert circularly polarized energy to linearly polarized energy and vice versa and to compensate for changes in the cross-polarization component of the electromagnetic energy out of each sectoral horn (not numbered). As is known, such a cross-polarized component increases with non-principal plane angles.
  • the polarization filter 17 is conventional, here being made up of parallel metal plates spaced at about 0.4 wavelengths at the upper end of the frequency band of interest and about 3/4 inches deep. The polarization filter 17, as shown, conforms with the polarizer 19. On transmission, then, only horizontally polarized energy is passed through the polarization filter 17 to the polarizer 19.
  • the polarizer 19 here consists of four sheets of dielectric material essentially transparent to the radio frequency energy passing through the Lens/Polarizer/Radome.
  • a metallic meanderline 19a, 19b, 19c, 19d, 19e is formed on each one of the sheets in accordance with the table shown in FIG. 2A.
  • the meanderlines are oriented so that each is inclined at an angle of 45° to the horizontal. As a result, then, linearly polarized energy passing through the polarizer 19 is converted to circularly polarized energy. Because the polarizer 19 is a reciprocal device, circularly polarized energy passing through the polarizer 19 is converted to linearly polarized energy.
  • absorbers 21, 23, 24 fabricated from any known absorbing material are affixed (as by cementing with an electrically thin layer of R.F. transparent adhesive) to the perimeter of the dielectric lens 13 and adjacent areas.
  • the absorbers 21, 23, 24 then are effective to prevent unwanted nulls in the antenna pattern and radiation from the ends of the dielectric lens 13.
  • spaces between the elements of the just-described Lens/Polarizer/Radome preferably are filled with dielectric material (not shown) having a dielectric constant approximating 1.0. Such a filler then has no appreciable electrical effect, but rather serves only to make the Lens/Polarizer/Radome a unitary structure.

Landscapes

  • Aerials With Secondary Devices (AREA)
  • Details Of Aerials (AREA)
EP19880309094 1987-10-02 1988-09-30 Linse/Polarisator/Radom Expired - Lifetime EP0310414B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10377887A 1987-10-02 1987-10-02
US103778 1987-10-02

Publications (3)

Publication Number Publication Date
EP0310414A2 true EP0310414A2 (de) 1989-04-05
EP0310414A3 EP0310414A3 (en) 1990-04-25
EP0310414B1 EP0310414B1 (de) 1994-06-01

Family

ID=22296996

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880309094 Expired - Lifetime EP0310414B1 (de) 1987-10-02 1988-09-30 Linse/Polarisator/Radom

Country Status (4)

Country Link
EP (1) EP0310414B1 (de)
AU (1) AU618281B2 (de)
CA (1) CA1304155C (de)
DE (1) DE3889834T2 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0437190A2 (de) * 1990-01-10 1991-07-17 International Telecommunications Satellite Organization Verwendung eines Polarisationswandlers für den Zugriff auf linearpolarisierte Satelliten mit einfach- oder dual zirkularpolarisierten Bodenstationsantennen
FR2729791A1 (fr) * 1988-06-14 1996-07-26 Thomson Csf Dispositif pour diminuer l'effet de radome avec une antenne large bande a rayonnement de surface, et diminuer la surface equivalente refelchissante de l'ensemble
EP0795928A2 (de) * 1996-03-13 1997-09-17 SPACE ENGINEERING S.p.A. Antenne mit Einzel- oder Doppelreflektor, geformten Strahlungskeulen und linearer Polarisation
WO1998045725A1 (de) * 1997-04-09 1998-10-15 Robert Bosch Gmbh Radarsystem, insbesondere für kraftfahrzeuganwendungen
US20100074315A1 (en) * 2008-09-24 2010-03-25 Quellan, Inc. Noise sampling detectors
CN107706526A (zh) * 2017-10-19 2018-02-16 西南交通大学 高功率埋入式极化转换天线罩
CN112234360A (zh) * 2020-09-17 2021-01-15 南京理工大学 端接滤波电路控制电特性的双极化透射表面及其设计方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5017939A (en) * 1989-09-26 1991-05-21 Hughes Aircraft Company Two layer matching dielectrics for radomes and lenses for wide angles of incidence

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3611392A (en) * 1968-03-25 1971-10-05 Post Office Primary feed for dish reflector having dielectric lens to reduce side lobes
FR2373891A1 (fr) * 1976-12-08 1978-07-07 Gen Dynamics Corp Antenne electronique d'emission ou de reception d'un signal de longueur d'onde donnee
EP0044502A1 (de) * 1980-07-17 1982-01-27 Siemens Aktiengesellschaft Vor einer Parabolreflektorantenne angeordnete Einrichtung zur Umwandlung von linear polarisierten in zirkular polarisierte elektromagnetische Wellen
US4342034A (en) * 1980-11-24 1982-07-27 Raytheon Company Radio frequency antenna with polarization changer and filter
EP0131328A1 (de) * 1983-07-01 1985-01-16 Rtc-Compelec Sende-Empfangseinrichtung für ein Radar zur Anwesenheitswahrnehmung und Verfahren zur Herstellung
EP0280379A2 (de) * 1987-02-27 1988-08-31 Yoshihiko Sugio Mit dielektrischem oder magnetischem Medium belastete Antenne

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4187507A (en) * 1978-10-13 1980-02-05 Sperry Rand Corporation Multiple beam antenna array
US4220957A (en) * 1979-06-01 1980-09-02 General Electric Company Dual frequency horn antenna system
US4698639A (en) * 1986-01-14 1987-10-06 The Singer Company Circularly polarized leaky waveguide doppler antenna

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3611392A (en) * 1968-03-25 1971-10-05 Post Office Primary feed for dish reflector having dielectric lens to reduce side lobes
FR2373891A1 (fr) * 1976-12-08 1978-07-07 Gen Dynamics Corp Antenne electronique d'emission ou de reception d'un signal de longueur d'onde donnee
EP0044502A1 (de) * 1980-07-17 1982-01-27 Siemens Aktiengesellschaft Vor einer Parabolreflektorantenne angeordnete Einrichtung zur Umwandlung von linear polarisierten in zirkular polarisierte elektromagnetische Wellen
US4342034A (en) * 1980-11-24 1982-07-27 Raytheon Company Radio frequency antenna with polarization changer and filter
EP0131328A1 (de) * 1983-07-01 1985-01-16 Rtc-Compelec Sende-Empfangseinrichtung für ein Radar zur Anwesenheitswahrnehmung und Verfahren zur Herstellung
EP0280379A2 (de) * 1987-02-27 1988-08-31 Yoshihiko Sugio Mit dielektrischem oder magnetischem Medium belastete Antenne

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2729791A1 (fr) * 1988-06-14 1996-07-26 Thomson Csf Dispositif pour diminuer l'effet de radome avec une antenne large bande a rayonnement de surface, et diminuer la surface equivalente refelchissante de l'ensemble
EP0437190A2 (de) * 1990-01-10 1991-07-17 International Telecommunications Satellite Organization Verwendung eines Polarisationswandlers für den Zugriff auf linearpolarisierte Satelliten mit einfach- oder dual zirkularpolarisierten Bodenstationsantennen
EP0437190A3 (en) * 1990-01-10 1991-11-06 International Telecommunications Satellite Organization Polarization converter application for accessing linearly polarized satellites with single- or dual-circularly polarized earth station antennas
EP0795928A2 (de) * 1996-03-13 1997-09-17 SPACE ENGINEERING S.p.A. Antenne mit Einzel- oder Doppelreflektor, geformten Strahlungskeulen und linearer Polarisation
EP0795928A3 (de) * 1996-03-13 1998-07-22 SPACE ENGINEERING S.p.A. Antenne mit Einzel- oder Doppelreflektor, geformten Strahlungskeulen und linearer Polarisation
US5990842A (en) * 1996-03-13 1999-11-23 Space Engineering S.P.A. Antenna with single or double reflectors, with shaped beams and linear polarisation
WO1998045725A1 (de) * 1997-04-09 1998-10-15 Robert Bosch Gmbh Radarsystem, insbesondere für kraftfahrzeuganwendungen
US20100074315A1 (en) * 2008-09-24 2010-03-25 Quellan, Inc. Noise sampling detectors
CN107706526A (zh) * 2017-10-19 2018-02-16 西南交通大学 高功率埋入式极化转换天线罩
CN107706526B (zh) * 2017-10-19 2024-04-05 西南交通大学 高功率埋入式极化转换天线罩
CN112234360A (zh) * 2020-09-17 2021-01-15 南京理工大学 端接滤波电路控制电特性的双极化透射表面及其设计方法
CN112234360B (zh) * 2020-09-17 2022-05-13 南京理工大学 端接滤波电路控制电特性的双极化透射表面及其设计方法

Also Published As

Publication number Publication date
EP0310414A3 (en) 1990-04-25
EP0310414B1 (de) 1994-06-01
DE3889834T2 (de) 1995-01-05
DE3889834D1 (de) 1994-07-07
AU618281B2 (en) 1991-12-19
CA1304155C (en) 1992-06-23
AU2292388A (en) 1989-04-06

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