US3820116A - Double reflector antenna with polarization rotating main reflector - Google Patents

Double reflector antenna with polarization rotating main reflector Download PDF

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Publication number
US3820116A
US3820116A US00347843A US34784373A US3820116A US 3820116 A US3820116 A US 3820116A US 00347843 A US00347843 A US 00347843A US 34784373 A US34784373 A US 34784373A US 3820116 A US3820116 A US 3820116A
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US
United States
Prior art keywords
subreflector
aperture
reflector
feeder
main 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.)
Expired - Lifetime
Application number
US00347843A
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English (en)
Inventor
E Carlsson
O Dahlsjo
G Karlsson
K Pettersson
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.)
Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Application granted granted Critical
Publication of US3820116A publication Critical patent/US3820116A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H01Q19/18—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 having two or more spaced reflecting surfaces
    • 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 
    • 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
    • H01Q19/18—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 having two or more spaced reflecting surfaces
    • H01Q19/19—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 having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface
    • H01Q19/195—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 having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface wherein a reflecting surface acts also as a polarisation filter or a polarising device

Definitions

  • a double reflector antenna system has a polarization rotating main reflector which is symmetrical, a polarization dependent subreflector which is symmetrical,
  • a feeder arranged with its aperture between the main reflector and the subreflector to deliver energy v to or receive energy from the subreflector, the aperture being in a plane perpendicular to the symmetry axis of the two reflectors and having an oval shape facing the subreflector,
  • the present invention relates to a double reflector antenna system with a polarization rotating main reflector, a polarization dependent subreflector and a feeder arranged to supply energy to or receive energy from the subreflector.
  • Previously feeders with round aperture in antennas have been used for special purposes, for example in antennas with lobe rotation, where a circular feeder is turned in a characteristic way with the maintained polarization direction of the antenna.
  • An object of the present invention is to obtain an antenna where the occurrence of the abovementioned kind of side lobes is at least to a great extent, prevented.
  • FIG. 1 schematically shows an example of an antenna of the kind to which the invention refers
  • FIG. 2 shows a front view of the feeder of the antenna
  • FIG. 3 shows, in a radiation diagram, the difference between measured side lobes for an earlier known antenna and an antenna system according to the invention and
  • FIG. 4 shows schematically a front view of the subreflector of the antenna system.
  • 11 indicates a polarization rotating main reflector, 12 a polarization dependent subreflector and a feeder.
  • the feeder 10 is arranged to supply energy to or receive energy from the subreflector 12.
  • the arrowed-ray in FIG. 1, indicates how the radiant energy from the feeder 10 is reflected by the subreflector 12 towards the main reflector 11 and then is transmitted through the subreflector 12 owing to occurred polarization rotating in the main reflector 11.
  • the curve G shows a radiation diagram for an earlier known antenna in a diagonal plane through a subreflector constructed with vertical wires for the reflection of vertical polarized signals.
  • the letter S indicates the radiation density in decibels and 9 the angle from the symmetry axis of the antenna.
  • the curve G shows a considerable maximum outside the side lobes close to the main lobe.
  • the curve N indicates the corresponding radiation diagram for an antenna system formed according to the invention.
  • the antenna according to the inven tion gives a considerably better relation between main lobe and side lobes.
  • the aperture elliptic and to aim the feeder so that the major axis of the aperture will be perpendicular to the polarization direction of the energy reflected from the subreflector, that is, if the subreflector is made of a grip reflector known per se with the grid wires lying in between parallel, vertical planes, the major axis will lie in a horizontal plane.
  • the feeder shown in FIG. 2 is formed with a wall 21 dividing the aperture, which wallextends along the major axis of the oval.
  • the subreflector 12 shown in FIG. 4 is in well-known manner formed as a plastic shell, in which vertical metal wires 41 are embedded. These metal wires reflect waves arriving at the subreflector, if these have vertical polarization, while on the other hand waves with horizontal polarization pass through.
  • the feeder 10 has an oval aperture facing the subreflector 12 with the largest diameter of the aperture perpendicular to the direction of the metal wires We claim:
  • a double reflector antenna system comprising a polarization rotating main reflector, a polarization dependent subreflector disposed opposite said main reflector, and a feeder means disposed adjacent said main reflector in such a way that signal energy from said feeder means is transmitted to said subreflector and reflected therefrom to said main reflector or external signal energy received by said main reflector is reflected therefrom and via a further reflection from said subreflector to said feeder means, said feeder means including a tubular aperture aimed at said subreflector and having a cross-section which is elliptical with a major axis orthogonal to the polarization direction of the energy reflected from said subreflector.
  • a double reflector antenna comprising a polarization rotating main reflector which is symmetrical about a given axis, a polarization dependent subrefiector facing said main reflector and being symmetrical about said given axis, and a feeder means having an aperture between said reflectors and disposed to deliver energy to or receive energy from said subrefiector, said aperture being in a plane orthogonal to said given axis and having an oval cross-section in said plane.
  • the subrefiector (12) consists of a grid reflector known per se, the feeder being so directed that the largest diameter of the aperture (20) is perpendicular to the direction of the grid wires of the subreflector (l2).

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  • Aerials With Secondary Devices (AREA)
US00347843A 1972-04-24 1973-04-04 Double reflector antenna with polarization rotating main reflector Expired - Lifetime US3820116A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE05357/72A SE356641B (en, 2012) 1972-04-24 1972-04-24

Publications (1)

Publication Number Publication Date
US3820116A true US3820116A (en) 1974-06-25

Family

ID=20266295

Family Applications (1)

Application Number Title Priority Date Filing Date
US00347843A Expired - Lifetime US3820116A (en) 1972-04-24 1973-04-04 Double reflector antenna with polarization rotating main reflector

Country Status (6)

Country Link
US (1) US3820116A (en, 2012)
CH (1) CH545542A (en, 2012)
FR (1) FR2181959B1 (en, 2012)
GB (1) GB1374567A (en, 2012)
NL (1) NL178378C (en, 2012)
SE (1) SE356641B (en, 2012)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0015837A3 (fr) * 1979-03-09 1980-10-01 Thomson-Csf Antenne à plans parallèles à rotation de polarisation
US4298876A (en) * 1979-03-02 1981-11-03 Thomson-Csf Polarizer for microwave antenna
US4343000A (en) * 1981-04-06 1982-08-03 The United States Of America As Represented By The Secretary Of The Navy Aircraft self-protection radar
EP0080319A1 (en) * 1981-11-19 1983-06-01 The Marconi Company Limited Antenna assemblies
EP0147325A3 (en) * 1983-12-30 1985-08-14 Thomson-Csf Antenna with two orthogonal parabolic cylindrical reflectors and process for making it
US4574287A (en) * 1983-03-04 1986-03-04 The United States Of America As Represented By The Secretary Of The Navy Fixed aperture, rotating feed, beam scanning antenna system
US4977407A (en) * 1981-07-23 1990-12-11 Crane Patrick E Optical collimator
US5455589A (en) * 1994-01-07 1995-10-03 Millitech Corporation Compact microwave and millimeter wave radar
US5883602A (en) * 1996-06-05 1999-03-16 Apti, Inc. Wideband flat short foci lens antenna

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2907033A (en) * 1956-10-19 1959-09-29 Gabriel Co Wave-guide antenna
FR1264818A (fr) * 1959-08-10 1961-06-23 Gen Electric Co Ltd Perfectionnements apportés aux antennes passives
FR1307590A (fr) * 1960-12-27 1962-10-26 Western Electric Co Dispositif d'antenne
FR1508062A (fr) * 1965-04-12 1968-01-05 Csf Antennes aplanétiques
GB1181060A (en) * 1966-01-31 1970-02-11 Mini Of Technology Improvements in or relating to Horn Aerials
GB1179392A (en) * 1966-01-31 1970-01-28 Mini Of Technology Improvements in or relating to Horn Aerials

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4298876A (en) * 1979-03-02 1981-11-03 Thomson-Csf Polarizer for microwave antenna
EP0015837A3 (fr) * 1979-03-09 1980-10-01 Thomson-Csf Antenne à plans parallèles à rotation de polarisation
FR2451114A1 (fr) * 1979-03-09 1980-10-03 Thomson Csf Antenne a plans paralleles a rotation de polarisation
US4297710A (en) * 1979-03-09 1981-10-27 Thomson-Csf Parallel-plane antenna with rotation of polarization
US4343000A (en) * 1981-04-06 1982-08-03 The United States Of America As Represented By The Secretary Of The Navy Aircraft self-protection radar
US4977407A (en) * 1981-07-23 1990-12-11 Crane Patrick E Optical collimator
EP0080319A1 (en) * 1981-11-19 1983-06-01 The Marconi Company Limited Antenna assemblies
US4574287A (en) * 1983-03-04 1986-03-04 The United States Of America As Represented By The Secretary Of The Navy Fixed aperture, rotating feed, beam scanning antenna system
EP0147325A3 (en) * 1983-12-30 1985-08-14 Thomson-Csf Antenna with two orthogonal parabolic cylindrical reflectors and process for making it
US4665405A (en) * 1983-12-30 1987-05-12 Thomson-Csf Antenna having two crossed cylindro-parabolic reflectors
US5455589A (en) * 1994-01-07 1995-10-03 Millitech Corporation Compact microwave and millimeter wave radar
US5680139A (en) * 1994-01-07 1997-10-21 Millitech Corporation Compact microwave and millimeter wave radar
US5883602A (en) * 1996-06-05 1999-03-16 Apti, Inc. Wideband flat short foci lens antenna

Also Published As

Publication number Publication date
SE356641B (en, 2012) 1973-05-28
NL7305576A (en, 2012) 1973-10-26
GB1374567A (en) 1974-11-20
CH545542A (en, 2012) 1974-01-31
FR2181959B1 (en, 2012) 1977-02-11
NL178378B (nl) 1985-10-01
FR2181959A1 (en, 2012) 1973-12-07
NL178378C (nl) 1986-03-03

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