EP1137102A2 - Ouverture de réflecteur à fréquence variable - Google Patents
Ouverture de réflecteur à fréquence variable Download PDFInfo
- Publication number
- EP1137102A2 EP1137102A2 EP01106761A EP01106761A EP1137102A2 EP 1137102 A2 EP1137102 A2 EP 1137102A2 EP 01106761 A EP01106761 A EP 01106761A EP 01106761 A EP01106761 A EP 01106761A EP 1137102 A2 EP1137102 A2 EP 1137102A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- frequency
- reflector
- frequency band
- selective surface
- frequency selective
- 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- Withdrawn
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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
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
-
- 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
- the present invention relates generally to antennas, and more particularly, to a frequency variable aperture reflector.
- the gain of a radiating reflector antenna increases with the increase of the operational signal frequency.
- the antenna aperture angle of a radiating reflector antenna decreases with the increase of the operational signal frequency.
- gain is a function of the square of the operation frequency.
- Another object of the invention is to provide an improved and reliable frequency variable aperture reflector. Another object of the invention is to provide a single reflector antenna capable of being used efficiently for multiple frequency bands over a wide frequency range.
- a frequency variable aperture reflector for working in a first and second frequency band, where the first frequency band is higher then the second frequency, includes a radiating element having an active surface and a frequency selective surface.
- the active surface is a contiguous surface capable of reflecting both the first and second frequency bands.
- the frequency selective surface surrounds the active surface and only reflects the second frequency band.
- the present invention thus achieves an improved frequency variable aperture reflector.
- the present invention is advantageous in that it improves antenna performance while eliminating the need for multiple antennas.
- This invention is ideal for radiometer applications where constant beamwidths are required over multiple frequency bands.
- Satellite antenna system 10 is comprised of one or more satellites 12 in communication with a ground station 14 located on the Earth 16. Each satellite 12 contains one or more frequency variable aperture reflectors 18.
- Reflector 18 can be used in both a transmit and receive mode of operation, each mode having a different frequency.
- a diplexer connected behind the common transmit/receive feed(s) allows satellite 12 to separate the transmit signal from the receive signal. Because the beam size is a function of signal wavelength and the transmit signal and receive signal operate at different frequencies, the transmit and receive beams will be of different size unless a frequency selective surface on the antenna is used. By using a frequency selective surface, it is possible to produce equal size beams at the transmit and receive frequencies.
- the frequency selective surface portion of reflector 18 is designed to be reflective at the lowest frequency and transparent at the highest frequency.
- D 1 D 2 + 2h
- h is the width of the frequency selective surface located on the outside portion of the reflector.
- Reflector 18 is a satellite dish antenna used to transmit and receive signals in a first frequency band and a second frequency band from satellite 12 to ground station 14. The first frequency band is higher then the second frequency band.
- Reflector 18 includes an active surface 20 and a frequency selective surface 22.
- Active surface 20 has a substantially contiguous surface capable of reflecting both the first and second frequency bands.
- Frequency selective surface 22 is adjacent to and surrounds active surface 20 and has a non-contiguous surface designed to reflect the second frequency band with little or no attenuation, while being transmissive to the first frequency band. While the preferred embodiment uses only one frequency reflective surface, one skilled in the art would also recognize that a second frequency selective surface adjacent to and surrounding the frequency selective surface could be used. The second frequency selective surface would be reflective to a third frequency band, while being transmissive to the first and second frequency band. Additional frequency selective surfaces could be added, as additional frequency bands are required.
- FIGURE 3 a cross section of a frequency variable aperture reflector 18 according to one embodiment of the present invention is illustrated.
- a single parabolic reflector 18 is used.
- a shaped reflector which is designed to produce shaped beams could be also be used.
- the current teachings could be extended to dual or multi-reflector systems.
- FIGURE 3 shows the geometry of a single offset reflector 18 with a diameter of fifty inches feed by a corrugated horn operating at twenty and thirty giga-hertz where active surface 20 is disposed on a dielectric substrate. Without frequency selective surface 22, the beam width of this antenna is about one degree at twenty giga-hertz and 0.65 degrees at thirty giga-hertz, which is undesirable.
- the frequency selective surface (FSS) for a singly curved reflector is much easier to design than for a doubly curved reflector.
- the doubly curved FSS needs to be designed for both ⁇ and ⁇ .
- Geometry 24 is made up of a plurality of conducting rings 26 on a dielectric substrate.
- the outer eight inches of reflector 18 uses the frequency selective surface 22. This surface almost completely reflects any incident field at 20 giga-hertz and transmits almost completely at thirty giga-hertz.
- a simple ring 26 design is shown, many other implementations of frequency selective surface 22 are possible.
- other frequency selective surfaces include, a plurality of periodic conduction lines radiating away from active surface 20, a plurality of periodic concentric circle arrays encircling the active surface 20, or a plurality of periodic circular holes or slots.
Landscapes
- Aerials With Secondary Devices (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US52860500A | 2000-03-20 | 2000-03-20 | |
US528605 | 2000-03-20 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1137102A2 true EP1137102A2 (fr) | 2001-09-26 |
EP1137102A3 EP1137102A3 (fr) | 2004-01-07 |
Family
ID=24106386
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01106761A Withdrawn EP1137102A3 (fr) | 2000-03-20 | 2001-03-17 | Ouverture de réflecteur à fréquence variable |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP1137102A3 (fr) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7034771B2 (en) * | 2003-09-10 | 2006-04-25 | The Boeing Company | Multi-beam and multi-band antenna system for communication satellites |
EP2421095A1 (fr) * | 2010-08-16 | 2012-02-22 | The Boeing Company | Protection de dispositif électronique |
US8947892B1 (en) | 2010-08-16 | 2015-02-03 | The Boeing Company | Electronic device protection |
WO2018109837A1 (fr) * | 2016-12-13 | 2018-06-21 | 三菱電機株式会社 | Dispositif d'antennes à miroirs de réflexion |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108281795B (zh) * | 2017-12-05 | 2020-10-30 | 安徽四创电子股份有限公司 | 一种频率选择表面型曲面介质及卡塞格伦天线系统 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3514781A (en) * | 1967-12-05 | 1970-05-26 | Us Army | Broadband,high gain antenna with relatively constant beamwidth |
US4096483A (en) * | 1975-03-14 | 1978-06-20 | Thomson-Csf | Reflector with frequency selective ring of absorptive material for aperture control |
US4814785A (en) * | 1988-01-25 | 1989-03-21 | Hughes Aircraft Company | Wideband gridded square frequency selective surface |
US4851858A (en) * | 1984-01-26 | 1989-07-25 | Messerschmitt-Boelkow-Blohm Gmbh | Reflector antenna for operation in more than one frequency band |
US5977926A (en) * | 1998-09-10 | 1999-11-02 | Trw Inc. | Multi-focus reflector antenna |
-
2001
- 2001-03-17 EP EP01106761A patent/EP1137102A3/fr not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3514781A (en) * | 1967-12-05 | 1970-05-26 | Us Army | Broadband,high gain antenna with relatively constant beamwidth |
US4096483A (en) * | 1975-03-14 | 1978-06-20 | Thomson-Csf | Reflector with frequency selective ring of absorptive material for aperture control |
US4851858A (en) * | 1984-01-26 | 1989-07-25 | Messerschmitt-Boelkow-Blohm Gmbh | Reflector antenna for operation in more than one frequency band |
US4814785A (en) * | 1988-01-25 | 1989-03-21 | Hughes Aircraft Company | Wideband gridded square frequency selective surface |
US5977926A (en) * | 1998-09-10 | 1999-11-02 | Trw Inc. | Multi-focus reflector antenna |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7034771B2 (en) * | 2003-09-10 | 2006-04-25 | The Boeing Company | Multi-beam and multi-band antenna system for communication satellites |
US7868840B2 (en) | 2003-09-10 | 2011-01-11 | The Boeing Company | Multi-beam and multi-band antenna system for communication satellites |
EP2421095A1 (fr) * | 2010-08-16 | 2012-02-22 | The Boeing Company | Protection de dispositif électronique |
US8325495B2 (en) | 2010-08-16 | 2012-12-04 | The Boeing Company | Electronic device protection |
US8947892B1 (en) | 2010-08-16 | 2015-02-03 | The Boeing Company | Electronic device protection |
US9204582B2 (en) | 2010-08-16 | 2015-12-01 | The Boeing Company | Electronic device protection |
WO2018109837A1 (fr) * | 2016-12-13 | 2018-06-21 | 三菱電機株式会社 | Dispositif d'antennes à miroirs de réflexion |
Also Published As
Publication number | Publication date |
---|---|
EP1137102A3 (fr) | 2004-01-07 |
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