Attenuation apparatus for minimizing reflections of electromagnetic energy from an antenna disposed within a radome
원문보기
IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0390288
(2003-03-17)
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발명자
/ 주소 |
- Desargant, Glenn J.
- Bien, Albert Louis
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
7 인용 특허 :
7 |
초록
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An attenuation device for use under a radome disposed on a mobile platform such as an aircraft for reflecting a portion of the electromagnetic energy radiated by an antenna disposed under the radome such that the reflected portion of energy impinges the radome at an angle normal thereto, thereby red
An attenuation device for use under a radome disposed on a mobile platform such as an aircraft for reflecting a portion of the electromagnetic energy radiated by an antenna disposed under the radome such that the reflected portion of energy impinges the radome at an angle normal thereto, thereby reducing or eliminating further reflections of the reflected portion of energy within the radome toward the mobile platform. In one embodiment the radome includes a base covered with a radar absorbing material (RAM). In another embodiment the radome includes a curved base adapted to match the mobile platform surface curvature on which the attenuation apparatus is mounted. In a further embodiment, RAM is disposed on an exterior surface of the mobile platform under the radome. In still another embodiment, the base is formed of an attenuating transverse magnetic TM wave corrugated plate.
대표청구항
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1. An apparatus adapted for use under a radome, wherein the radome is disposed on an exterior surface of a mobile platform and the radome encloses a mechanically scanned antenna, for absorbing a first portion of electromagnetic energy and reflecting a second portion of electromagnetic energy within
1. An apparatus adapted for use under a radome, wherein the radome is disposed on an exterior surface of a mobile platform and the radome encloses a mechanically scanned antenna, for absorbing a first portion of electromagnetic energy and reflecting a second portion of electromagnetic energy within the radome away from the exterior surface of the mobile platform, the apparatus comprising:an angled wall at least partially circumscribing said mechanically scanned antenna and disposed adjacent to said exterior surface, said angled wall being disposed so as to diverge from said exterior surface of said mobile platform; and wherein said angled wall operates to absorb said first portion of said electromagnetic energy and reflect said second portion of said electromagnetic energy reflected from an interior surface of said radome toward said exterior surface back toward said interior surface of said radome such that said electromagnetic energy impinges said interior surface of said radome at an incidence angle generally normal to said interior surface, to enable said electromagnetic energy to pass through said radome. 2. The apparatus of claim 1, comprising a layer of radar absorption material disposed on said angled wall to further absorb said electromagnetic energy.3. An attenuation apparatus adapted for use under a radome, wherein the radome is disposed on an exterior surface of a mobile platform and encloses a mechanically scanned antenna, for absorbing and reflecting electromagnetic radiation radiated from said antenna away from said mobile platform, said attenuation apparatus comprising:an angled wall at least substantially circumscribing said mechanically scanned antenna and disposed adjacent said exterior surface, and extending at an angle so as to diverge from said exterior surface of said mobile platform; said angled wall operating to reflect a portion of electromagnetic energy radiated from said mechanically scanned antenna when said antenna is radiating said energy at a predetermined scan angle which would result in a portion of said energy being reflected by said radome back toward said mobile platform; and said angled wall operating to reflect said portion of said energy toward an interior surface of said radome such that said portion of said energy impinges said radome at an angle generally normal to said interior surface of said radome, to thereby maximize the likelihood of said portion of said energy passing through said radome without being further reflected back toward said mobile platform. 4. The attenuation apparatus of claim 3, further comprising a plate disposed within said angled wall for further absorbing electromagnetic energy reflected by said radome back toward said mobile platform.5. The attenuation apparatus of claim 3, further comprising at least one reflection absorbing panel disposed on said exterior surface inwardly of said angled wall for further absorbing electromagnetic energy reflected by said radome toward said mobile platform.6. An attenuation apparatus adapted for use under a radome, wherein the radome is disposed on an exterior surface of a vehicle and encloses at least one antenna, for reflecting electromagnetic radiation radiated from said antenna away from said vehicle, said attenuation apparatus comprising:a member disposed adjacent said exterior surface of said vehicle; an angled wall circumscribing said member and extending at an angle relative to said member; said angled wall and said angle operating to reflect a first portion of electromagnetic energy radiated from said antenna when said antenna is radiating said energy at a predetermined scan angle which would result in a first portion of said energy being reflected by said radome back toward said vehicle; said angled wall operating to reflect said first portion of said energy toward an interior surface of said radome such that said first portion of said energy impinges said radome at an angle generally normal to said interior surface, to thereby maximize the likelihood of said first portion of said energy passing through said radome without being further reflected back toward said vehicle; and said member having a corrugated surface shape operating to substantially attenuate a second portion of said electromagnetic energy. 7. The attenuation apparatus of claim 6, wherein said member comprises a generally planar plate.8. The attenuation apparatus of claim 6, wherein said angled wall forms a frustoconical member.9. The attenuation apparatus of claim 7, wherein said angled wall forms a frustoconical member having a lower edge and an upper edge, said lower edge being secured adjacent an outer periphery of said plate.10. the attenuation apparatus of claim 7, wherein said plate comprises a substrate having a radar absorbing material disposed thereon.11. The attenuation apparatus of claim 6, wherein said angled wall comprises a substrate having a radar absorbing material disposed thereon.12. A radiated energy absorption system mountable on a mobile platform, comprising:a radome disposed on one of an exterior surface of said mobile platform; a mechanically scanned antenna disposed within said radome; a support assembly connectably joining said radome to said exterior surface, and having a first surface extending at an angle relative to a portion of said exterior surface so as to absorb a first portion of electromagnetic energy radiated from said antenna when said antenna is radiating said energy at a predetermined scan angle; and said support assembly having a second surface further operating to reflect a second portion of electromagnetic energy away from said exterior surface at an angle to thereby minimize the possibility of said second portion of electromagnetic energy being further reflected by said radome. 13. The system of claim 12, further comprising a plate disposed within said perimeter for further intercepting electromagnetic energy radiated by said antenna.14. The system of claim 13, comprising a radar absorbing material disposed on both said plate and said support assembly.15. The system of claim 12, wherein said angle of said support assembly is determined based at least in part on the contour of said radome.16. The system of claim 12, further comprising:said antenna being rotatably operable to radiate said energy within an angular range measurable from a first axis disposed approximately parallel to said exterior surface; and said predetermined scan angle defining an incident angle ranging between approximately 70 degrees to approximately 90 degrees measurable from a second axis perpendicularly disposed through said radome. 17. A method for reducing the reflection of electromagnetic radiation into a mobile platform from a mechanically scanned antenna mounted within a radome, wherein the electromagnetic radiation is at least partially reflected by the radome back toward the mobile platform on which the radome and the antenna assembly are mounted, said method comprising the steps of:locating an angled wall adjacent to a surface of the mobile platform and peripherally circumscribing at least a portion of said antenna such that the angled wall intercepts a portion of said electromagnetic energy radiated from the antenna and reflected by the radome back toward the mobile platform; mechanically scanning said antenna such that a portion of the electromagnetic energy reflects toward the angled wall; and using the angled wall to redirect the portion of the electromagnetic energy reflected by the randome back toward the radome at an angle relative to the radome which reduces the possibilty of the portion of the energy again being reflected by the radome back toward the mobile platform. 18. The method of claim 17, further comprising the step of using a plate disposed adjacent to an exterior surface of the mobile platform and within an interior area defined by an edge of the angled wall to absorb electromagnetic energy reflected by the randome back toward the mobile platform.19. The method of claim 18, further comprising the step of applying a radar absorbing material on the plate to further absorb at least a portion of the electromagnetic energy reflected by the radome back toward the mobile platform.
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Levy Stanley P. (1037 E. Lemon Ave. Monrovia CA 91016), Double reflector antenna with integral radome reflector support.
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Sanford John R. ; Blasing Raymond R. ; Kishk Ahmed A., Low sidelobe reflector antenna system employing a corrugated subreflector.
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Desargant, Glen J.; Bien, Albert Louis, Reflector assembly for minimizing reflections of electromagnetic energy from an antenna disposed within a radome.
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