EP0044502B1 - Dispositif polarisant pour convertir des ondes électromagnétiques polarisées d'une façon linéaire en des ondes électromagnétiques polarisées d'une façon circulaire placé devant une antenne parabolique à réflecteur - Google Patents
Dispositif polarisant pour convertir des ondes électromagnétiques polarisées d'une façon linéaire en des ondes électromagnétiques polarisées d'une façon circulaire placé devant une antenne parabolique à réflecteur Download PDFInfo
- Publication number
- EP0044502B1 EP0044502B1 EP81105473A EP81105473A EP0044502B1 EP 0044502 B1 EP0044502 B1 EP 0044502B1 EP 81105473 A EP81105473 A EP 81105473A EP 81105473 A EP81105473 A EP 81105473A EP 0044502 B1 EP0044502 B1 EP 0044502B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- conductors
- layer
- layers
- aperture
- radiation
- 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
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Classifications
-
- 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
- H01Q15/02—Refracting or diffracting devices, e.g. lens, prism
- H01Q15/12—Refracting or diffracting devices, e.g. lens, prism functioning also as polarisation filter
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- 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
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- 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
Definitions
- the invention relates to a device for converting linearly polarized electromagnetic waves into circularly polarized waves, consisting of a primary radiation detector and a target follower radar antenna arranged in front of the radiating opening of the parabolic reflector and consisting of a primary radiator and a parabolic reflector and integrated into a curved cover (radome) of this opening
- a device for converting linearly polarized electromagnetic waves into circularly polarized waves consisting of a primary radiation detector and a target follower radar antenna arranged in front of the radiating opening of the parabolic reflector and consisting of a primary radiator and a parabolic reflector and integrated into a curved cover (radome) of this opening
- a cover (radome) is known from GB-A-1 240 529 for a target follower radar antenna consisting of a primary radiator and a parabolic reflector for the radiating opening of the parabolic reflector, in which a device for converting linearly polarized electromagnetic waves into circularly polarized waves is integrated .
- This known device consists of a lattice structure with two lattice layers, each of which consists of thin, parallel wires.
- a Cassegrain antenna with a primary radiator with a sub-reflector consisting of a three-layer grating structure and with a flat main reflector is known.
- This subreflector has the task, for. B. right-handed circularly polarized waves emanating from the primary radiator to reflect to the main reflector and to let through the waves polarized by the main reflector in a left-handed circular polarization unhindered.
- This subreflector has a middle layer in the lattice structure, which transmits the waves of a specific linear polarization and reflects waves polarized perpendicular to it.
- the two outer layers of the grating structure convert circularly polarized waves into linearly polarized waves in one beam passage direction and linearly polarized waves into circularly polarized waves in the opposite beam passage direction.
- This subreflector accordingly fulfills the function, among other things, of converting the left-hand circularly polarized waves reflected by the main reflector as the radiating opening of the antenna into vertically linearly polarized waves and then converting them back into left-hand circularly polarized waves.
- the suppression or decoupling of the cross polarization compared to a desired linear polarization is for many applications, e.g. B. also of great importance in order to achieve the necessary accuracy in target radar methods that work with parabolic mirror antennas.
- gratings with metal strips or wires running perpendicular to the E vector can be used.
- the cross polarization component running parallel to the wires is reflected and thus suppressed.
- the degree of suppression of the cross-polarization components is further increased.
- Such a linear polarization filter also forms the middle layer of the grating structure of the subreflector according to US Pat. No. 3,340,535.
- the object of the invention is to improve a device of the type mentioned at the outset in such a way that any given linear polarization, that is to say possibly with interfering cross-polarization components, of a target following radar device is converted into a purely circular polarization.
- the rectilinear conductors of the layer of the lattice structure closest to the radiating opening are inclined by 45 ° with respect to their main direction of expansion with respect to the conductors of the layer or layers further away from the radiating opening, that the conductors in the individual layers of the lattice structure are etched, strip-shaped conductor tracks on one plastic film per layer, and that the specified main directions of expansion of the conductors are related to the projection in a plane perpendicular to the main radiation axis of the target secondary radar antenna.
- linear polarization filtering For the linearly polarized radiation emanating from the radiating opening of the parabolic reflector and thus from the entire target slave radar antenna, which can have cross-polarization components at various points in this opening, linear polarization filtering is first carried out and then the filtered out ideal linear polarization is converted into radiation with pure circular polarization. In the case of linear polarization filtering, only that radiation component is let through whose E vector is perpendicular to the straight conductors running parallel to one another.
- the other layers of the lattice structure are arranged one or more layers with rectilinear and parallel conductors, whose main direction of expansion corresponds to that of the conductors of the layer closest to the radiating opening.
- the invention can e.g. B. apply to a cone-shaped cover of the parabolic reflector.
- insulating layers are advantageously used which consist of hard foam or are designed as a honeycomb structure.
- the lattice structure shown in Figures 1 and 2 consists of two layers 1 and 2, which are formed by parallel, straight conductor tracks, and three layers 3, 4 and 5, each of several, in the form of meandering lines parallel to each other 6 exist.
- the direction of skin expansion of the meandering conductor tracks 6 is inclined by 45 ° with respect to that of the conductor tracks 7 of the layers 1 and 2.
- the combined grating structure lies in front of the radiation aperture of a target follower radar antenna, which is composed of a primary radiator 8 and a parabolic reflector 9.
- the primary radiator 8 emits a radiation X in linear polarization with a polarization direction, which is indicated by the arrow 10.
- Cross-polarization components arise during the reflection at the parabolic reflector 9.
- Radiation with non-ideal linear polarization then falls on the grating structure in front of the antenna aperture.
- the first two layers 1 and 2 of this grating structure then effect a linear polarization filtering, so that only the radiation with the polarization indicated by the arrow 10 is passed to the layers 3, 4 and 5 because of the vertical alignment of the conductor tracks 7.
- the layers 3, 4 and 5 then bring about the conversion of the ideal linear polarization arriving there into a circular polarization, which then no longer has any orthogonal polarization components.
- FIG. 3 shows a section of the polarization grating according to FIGS. 1 and 2 with five interconnect layers one above the other, which are each produced on a plastic film 11, 12, 13, 14 and 15 by an etching process.
- a large number of meandering conductor tracks 16 are applied to each of the three plastic films 11, 12 and 13.
- the two conductor track layers on the plastic films 14 and 15 consist of a large number of rectilinear conductor tracks 17 the foils 11 to 15 can be adhered to, insulating layers 18, 19, 20 and 21 are arranged between these foils, which are advantageously embodied in a honeycomb structure, in particular for reasons of weight saving.
- the thickness of the entire multilayer grating structure is, for example, half a wavelength.
- the conductor tracks 16 and 17 correspond to the conductor tracks 6 and 7 in FIG. 1.
- the meandering conductor tracks 16 have, for example, an amplitude of one eighth wavelength and a spacing of approximately one tenth wavelength.
Landscapes
- Aerials With Secondary Devices (AREA)
Claims (4)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19803027094 DE3027094A1 (de) | 1980-07-17 | 1980-07-17 | Umpolarisiereinrichtung zur erzeugung zirkular polarisierter elektromagnetischer wellen |
DE3027094 | 1980-07-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0044502A1 EP0044502A1 (fr) | 1982-01-27 |
EP0044502B1 true EP0044502B1 (fr) | 1985-10-16 |
Family
ID=6107432
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81105473A Expired EP0044502B1 (fr) | 1980-07-17 | 1981-07-13 | Dispositif polarisant pour convertir des ondes électromagnétiques polarisées d'une façon linéaire en des ondes électromagnétiques polarisées d'une façon circulaire placé devant une antenne parabolique à réflecteur |
Country Status (3)
Country | Link |
---|---|
US (1) | US4479128A (fr) |
EP (1) | EP0044502B1 (fr) |
DE (1) | DE3027094A1 (fr) |
Families Citing this family (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IL66327A0 (fr) * | 1982-07-15 | 1982-11-30 | ||
FR2540296A1 (fr) * | 1983-01-31 | 1984-08-03 | Thomson Csf | Filtre spatial d'ondes electromagnetiques de polarisation circulaire et antenne cassegrain comportant un tel filtre |
DE3337049A1 (de) * | 1983-10-12 | 1985-05-09 | Gesellschaft für Schwerionenforschung mbH, 6100 Darmstadt | Feststoff mit besonderen elektrischen eigenschaften und verfahren zur herstellung eines solchen feststoffes |
US4565745A (en) * | 1984-09-10 | 1986-01-21 | Trw Inc. | Metallic stretch fabric |
US4786914A (en) * | 1985-01-25 | 1988-11-22 | E-Systems, Inc. | Meanderline polarization twister |
US4698639A (en) * | 1986-01-14 | 1987-10-06 | The Singer Company | Circularly polarized leaky waveguide doppler antenna |
CA1304155C (fr) * | 1987-10-02 | 1992-06-23 | Keith C. Smith | Lentille-polariseur-radome |
US4901086A (en) * | 1987-10-02 | 1990-02-13 | Raytheon Company | Lens/polarizer radome |
US4999639A (en) * | 1989-03-03 | 1991-03-12 | Hazeltine Corporation | Radome having integral heating and impedance matching elements |
FR2664747B1 (fr) * | 1990-07-10 | 1992-11-20 | Europ Agence Spatiale | Antenne a balayage par variation de frequence. |
US5258768A (en) * | 1990-07-26 | 1993-11-02 | Space Systems/Loral, Inc. | Dual band frequency reuse antenna |
US5959594A (en) * | 1997-03-04 | 1999-09-28 | Trw Inc. | Dual polarization frequency selective medium for diplexing two close bands at an incident angle |
CA2500191A1 (fr) * | 2001-05-31 | 2002-12-05 | Intelscan Orbylgjutaekni Ehf | Appareil et procede de determination par micro-ondes d'au moins un parametre physique d'une substance |
US6946990B2 (en) * | 2003-07-23 | 2005-09-20 | The Boeing Company | Apparatus and methods for radome depolarization compensation |
TWI312592B (en) * | 2006-06-30 | 2009-07-21 | Ind Tech Res Inst | Antenna structure with antenna radome and method for rising gain thereof |
US8081138B2 (en) * | 2006-12-01 | 2011-12-20 | Industrial Technology Research Institute | Antenna structure with antenna radome and method for rising gain thereof |
US9116302B2 (en) * | 2008-06-19 | 2015-08-25 | Ravenbrick Llc | Optical metapolarizer device |
CN101615720B (zh) * | 2008-06-27 | 2014-04-16 | 财团法人工业技术研究院 | 天线罩 |
US8947760B2 (en) | 2009-04-23 | 2015-02-03 | Ravenbrick Llc | Thermotropic optical shutter incorporating coatable polarizers |
CN104347957B (zh) * | 2013-08-01 | 2018-04-10 | 深圳光启创新技术有限公司 | 实现极化转换的超材料和极化器 |
EP3182505A1 (fr) * | 2015-12-14 | 2017-06-21 | Terma A/S | Antenne radar et système radar |
DE102016011652A1 (de) * | 2016-09-28 | 2018-03-29 | Diehl Metering Systems Gmbh | Anordnung zur Funkübertragung von Verbrauchsdaten und/oder Zustandsdaten |
US10840573B2 (en) | 2017-12-05 | 2020-11-17 | The United States Of America, As Represented By The Secretary Of The Air Force | Linear-to-circular polarizers using cascaded sheet impedances and cascaded waveplates |
US10547117B1 (en) | 2017-12-05 | 2020-01-28 | Unites States Of America As Represented By The Secretary Of The Air Force | Millimeter wave, wideband, wide scan phased array architecture for radiating circular polarization at high power levels |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0042611A1 (fr) * | 1980-06-24 | 1981-12-30 | Siemens Aktiengesellschaft | Grille conductrice pour la conversion de la polarisation d'ondes électromagnétiques |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB859528A (en) * | 1958-10-15 | 1961-01-25 | Marconi Wireless Telegraph Co | Improvements in or relating to circular polarisers for very short radio waves |
US2970312A (en) * | 1959-09-21 | 1961-01-31 | Robert M Smith | Broad band circularly polarized c-band antenna |
US3031664A (en) * | 1959-10-01 | 1962-04-24 | Marconi Wireless Telegraph Co | Polarisation screen and filter for radio waves |
US3369980A (en) * | 1963-08-15 | 1968-02-20 | Continental Oil Co | Production of gaseous unsaturated hydrocarbons |
US3340535A (en) * | 1964-06-16 | 1967-09-05 | Textron Inc | Circular polarization cassegrain antenna |
GB1240529A (en) * | 1968-08-09 | 1971-07-28 | British Aircraft Corp Ltd | Polarisers |
US3560984A (en) * | 1968-12-11 | 1971-02-02 | Loral Corp | Broadband circularly polarized antenna having a continuous rectangular aperture |
JPS4934648U (fr) * | 1972-06-30 | 1974-03-27 | ||
US3754271A (en) * | 1972-07-03 | 1973-08-21 | Gte Sylvania Inc | Broadband antenna polarizer |
US3831176A (en) * | 1973-06-04 | 1974-08-20 | Gte Sylvania Inc | Partial-radial-line antenna |
GB1561969A (en) * | 1975-11-13 | 1980-03-05 | Marconi Co Ltd | Apparatus for producing circularly or eliptically polarised electromagnetic radiation |
US4127857A (en) * | 1977-05-31 | 1978-11-28 | Raytheon Company | Radio frequency antenna with combined lens and polarizer |
-
1980
- 1980-07-17 DE DE19803027094 patent/DE3027094A1/de active Granted
-
1981
- 1981-07-08 US US06/281,323 patent/US4479128A/en not_active Expired - Fee Related
- 1981-07-13 EP EP81105473A patent/EP0044502B1/fr not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0042611A1 (fr) * | 1980-06-24 | 1981-12-30 | Siemens Aktiengesellschaft | Grille conductrice pour la conversion de la polarisation d'ondes électromagnétiques |
Non-Patent Citations (1)
Title |
---|
Taschenbuch Elektrotechnik Band 3, Bausteine der Informationstechnik, C. HANSER Verlag, München 1978, Seiten 571-573 * |
Also Published As
Publication number | Publication date |
---|---|
US4479128A (en) | 1984-10-23 |
DE3027094C2 (fr) | 1987-03-19 |
DE3027094A1 (de) | 1982-02-04 |
EP0044502A1 (fr) | 1982-01-27 |
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