Patent US6232931B1 successfully refreshed from Google Patents.
US6232931B1
Expired / Lapsed
US
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Opto-electronically controlled frequency selective surface
Assignee: NAVY GOVERNMENT OF United States, THE, Secretary of
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Filing: 1999-02-19
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Granted: 2001-05-15
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Expires: 2019-02-19
Abstract
Abstract An optically controlled frequency selective surface (FSS) includes an electrically conductive layer having an array of radio frequency scattering elements such as slots formed in an electrically conductive layer or loops mounted to a substrate. Photonically controlled elements, such as photo-diodes, photo-transistors, and other photo-electronic devices, are connected across each of the scattering elements. Electromagnetic characteristics of the FSS, including resonant frequency, impedance, and the pass/stop band, may be modulated by controlling the degree of illumination of the photonically controlled elements.
Inventors
- 👤 Stephen M. Hart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:29
CPC Classifications
H; H01; H01Q; H01Q15/00; H01Q15/0006; H01Q15/0013; H01Q15/002
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
59 words
An opto-electronically controlled frequency selective surface, comprising: a semiconducting substrate; and radio frequency scattering elements, wherein each said radio frequency scattering element includes: a track of electrically conductive material formed in a loop and mounted on said semiconducting substrate; and a photo-controlled element electrically connected to said track for changing scattering frequency characteristics of said radio frequency scattering element.
Claim 2
Dependent Claim
59 words
An opto-electronically controlled frequency selective surface, comprising: a semiconducting substrate; and radio frequency scattering elements, wherein each said radio frequency scattering element includes: a track of electrically conductive material formed in a loop and mounted on said semiconducting substrate; and a photo-controlled element electrically connected to said track for changing scattering frequency characteristics of said radio frequency scattering element.
Claim 3
Dependent Claim
37 words
The opto-electronically controlled frequency selective surface of claim 1 wherein each said loop is configured to have a shape selected from the group that includes a rectangular shape, Y-shape, bow-tie shape, polygonal shape, cross-shape, and circular shape.
Claim 4
Dependent Claim
32 words
The opto-electronically controlled frequency selective surface of claim 1 wherein said photo-controlled element is selected from the group that includes bulk semiconductor switches, photocells, photodiodes, phototransistors, and photovoltaic controlled field effect transistors.
Claim 5
Dependent Claim
37 words
The opto-electronically controlled frequency selective surface of claim 3 wherein said field effect transistors are selected from the group that includes high electron mobility transistors, metal semiconductor field effect transistors, and metal oxide semiconductor field effect transistors.
Claim 6
Dependent Claim
59 words
An opto-electronically controlled frequency selective surface, comprising: a dielectric substrate; and radio frequency scattering elements, wherein each said radio frequency scattering element includes: a track of electrically conductive material formed in a loop and mounted on said dielectric substrate; and a photo-controlled element electrically connected to said track for changing scattering frequency characteristics of said radio frequency scattering element.
Claim 7
Dependent Claim
59 words
An opto-electronically controlled frequency selective surface, comprising: a dielectric substrate; and radio frequency scattering elements, wherein each said radio frequency scattering element includes: a track of electrically conductive material formed in a loop and mounted on said dielectric substrate; and a photo-controlled element electrically connected to said track for changing scattering frequency characteristics of said radio frequency scattering element.
Claim 8
Dependent Claim
32 words
The opto-electronically controlled frequency selective surface of claim 5 wherein said photo-controlled element is selected from the group that includes bulk semiconductor switches, photocells, photodiodes, phototransistors, and photovoltaic controlled field effect transistors.
Claim 9
Dependent Claim
37 words
The opto-electronically controlled frequency selective surface of claim 5 wherein said field effect transistors are selected from the group that includes high electron mobility transistors, metal semiconductor field effect transistors, and metal oxide semiconductor field effect transistors.
Claim 10
Dependent Claim
34 words
The opto-electronically controlled frequency selective surface of claim 5 wherein each said loop has a shape selected from the group that includes a rectangular shape, Y-shape, cross-shape, bow-tie shape, polygonal shape, and circular shape.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-05-14 | 2004-11-13 | 2005-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-05-14 | 2008-11-13 | 2009-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-05-14 | 2012-11-13 | 2013-05-15 | $7700.00 | Window Closed / Lapsed |