US3820116A - Double reflector antenna with polarization rotating main reflector - Google Patents
Double reflector antenna with polarization rotating main reflector Download PDFInfo
- 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
- Authority
- 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
Links
- 230000010287 polarization Effects 0.000 title claims abstract description 35
- 230000001419 dependent effect Effects 0.000 claims abstract description 11
- 238000010586 diagram Methods 0.000 description 6
- 230000005855 radiation Effects 0.000 description 5
- 239000002184 metal Substances 0.000 description 3
- 230000001771 impaired effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Images
Classifications
-
- 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).
Landscapes
- Aerials With Secondary Devices (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE05357/72A SE356641B (xx) | 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 (xx) |
CH (1) | CH545542A (xx) |
FR (1) | FR2181959B1 (xx) |
GB (1) | GB1374567A (xx) |
NL (1) | NL178378C (xx) |
SE (1) | SE356641B (xx) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0015837A2 (fr) * | 1979-03-09 | 1980-09-17 | 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 |
EP0147325A2 (fr) * | 1983-12-30 | 1985-07-03 | Thomson-Csf | Antenne à deux réflecteurs cylindro-paraboliques croisés, et son procédé de fabrication |
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)
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 |
GB1179392A (en) * | 1966-01-31 | 1970-01-28 | Mini Of Technology | Improvements in or relating to Horn Aerials |
GB1181060A (en) * | 1966-01-31 | 1970-02-11 | Mini Of Technology | Improvements in or relating to Horn Aerials |
-
1972
- 1972-04-24 SE SE05357/72A patent/SE356641B/xx unknown
-
1973
- 1973-04-04 US US00347843A patent/US3820116A/en not_active Expired - Lifetime
- 1973-04-19 GB GB1919673A patent/GB1374567A/en not_active Expired
- 1973-04-19 NL NLAANVRAGE7305576,A patent/NL178378C/xx not_active IP Right Cessation
- 1973-04-20 FR FR7314589A patent/FR2181959B1/fr not_active Expired
- 1973-04-24 CH CH581873A patent/CH545542A/xx not_active IP Right Cessation
Cited By (15)
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 |
EP0015837A2 (fr) * | 1979-03-09 | 1980-09-17 | Thomson-Csf | Antenne à plans parallèles à rotation de polarisation |
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 |
EP0147325A2 (fr) * | 1983-12-30 | 1985-07-03 | Thomson-Csf | Antenne à deux réflecteurs cylindro-paraboliques croisés, et son procédé de fabrication |
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 (xx) | 1973-05-28 |
NL178378C (nl) | 1986-03-03 |
CH545542A (xx) | 1974-01-31 |
FR2181959A1 (xx) | 1973-12-07 |
NL7305576A (xx) | 1973-10-26 |
FR2181959B1 (xx) | 1977-02-11 |
NL178378B (nl) | 1985-10-01 |
GB1374567A (en) | 1974-11-20 |
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