Electromagnetic energy shield
First Claim
1. A structure for selectively transmitting electromagnetic energy, said structure comprisingat least one shutter means being mounted in said structure and includinga substrate, at least one surface of which includesat least one continuous conductive element extending in a selected direction along substantially the entire length of said surface;
- andat least one discontinuous element having separated conductive portions and extending in said selected direction along substantially the entire length of said surface; and
at least one diode means interconnecting the separated portions of said at least one discontinuous element;
means for biasing said at least one diode means in a non-conductive direction during a first operating mode so that said shutter means is substantially resonant to electromagnetic energy incident thereon within a selected frequency range so as to permit the substantial transmission of said incident energy within said selected frequency range through said structure and for biasing said at least one diode means in a conductive direction during a second operating mode so that said shutter means substantially prevents the transmission of electromagnetic energy through said structure within and outside of said selected frequency range.
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Accused Products
Abstract
A structure for selectively transmitting electromagnetic energy over a selected frequency range during a first operating mode and for substantially preventing the transmission of electromagnetic energy at any frequency during a second operating mode either by absorption or by reflection of such energy. The structure includes at least one shutter means comprising continuous and discontinuous elements and diode means interconnecting the discontinuous portions of the discontinuous element. The diode means are biased in a non-conductive direction during the first operating mode and are biased in a conductive direction during the second operating mode. The structure can further include filter means which include continuous and discontinuous elements arranged so as to be resonant over the selective frequency range during both operating modes. The filter means and the shutter means can be positioned at distances from each other of approximately one or more quarter wave lengths of the center frequency of the selective frequency range.
16 Citations
21 Claims
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1. A structure for selectively transmitting electromagnetic energy, said structure comprising
at least one shutter means being mounted in said structure and including a substrate, at least one surface of which includes at least one continuous conductive element extending in a selected direction along substantially the entire length of said surface; - and
at least one discontinuous element having separated conductive portions and extending in said selected direction along substantially the entire length of said surface; and at least one diode means interconnecting the separated portions of said at least one discontinuous element; means for biasing said at least one diode means in a non-conductive direction during a first operating mode so that said shutter means is substantially resonant to electromagnetic energy incident thereon within a selected frequency range so as to permit the substantial transmission of said incident energy within said selected frequency range through said structure and for biasing said at least one diode means in a conductive direction during a second operating mode so that said shutter means substantially prevents the transmission of electromagnetic energy through said structure within and outside of said selected frequency range.
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2. A structure for selectively transmitting electromagnetic energy, said structure comprising at least one resonating means being mounted on a panel surface within said structure and including a plurality of continuous conductive elements extending in a selected direction along substantially the entire length of said surface and a plurality of discontinuous elements having separated conductive portions and extending in said selected direction along substantially the entire length of said surface, one or more diode means interconnecting said separated portions of said resonating means;
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means for biasing said one or more diode means in a non-conductive direction during a first operating mode so that said resonating means is resonant over a selected frequency range whereby electromagnetic energy within said selected frequency range which is incident on said structure is substantially transmitted through said structure; and said biasing means for biasing said one or more diode means in a conductive direction during a second operating mode so that said resonating means becomes non-resonant whereby said incident electromagnetic energy within and outside said selected frequency range is substantially prevented from being transmitted through said structure. - View Dependent Claims (3, 4, 5, 6)
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7. A shielding structure for selectively transmitting electromagnetic energy, said structure comprising
at least one in-board panel means being positioned in said structure and including a first substrate a plurality of parallel continuous conductive elements applied to a first surface of said first substrate each of said continuous conductive elements extending in a selected direction along substantially the entire length of said first surface; -
a plurality of parallel discontinuous conductive elements applied to the first surface of said first substrate in parallel with and intermediate said continuous conductive element each of said discontinuous conductive elements having separated portions extending in a selected direction along substantially the entire length of said first surface; a plurality of first diode means interconnecting the separated portions of said discontinuous conductive elements; and first biasing means for biasing said first diode means in a non-conductive direction during a first operating mode and for biasing said first diode means at a first bias level in a conductive direction during a second operating mode; at least one out-board panel means being positioned in said structure adjacent to said in-board panel means and including a second substrate; a plurality of parallel continuous conductive elements applied to a first surface of said second substrate each of said continuous conductive elements extending in a selected direction along substantially the entire length of said first surface; and a plurality of parallel discontinuous conductive elements applied to the first surface of said second substrate in parallel with and intermediate said conductive elements each of said discontinuous conductive elements having separated portions extending in a selected direction along substantially the entire length of said first surface; the continuous and discontinuous conductive elements on said in-board and said out-board panel means being resonant over a selected frequency range during said first operating mode so as to permit the transmission of electromagnetic energy within said selected frequency range during said first operating mode; and the continuous and discontinuous conductive elements of at least said in-board panel means being non-resonant during said second operating mode whereby the transmission of electromagnetic energy within said selected frequency range is substantially prevented, the transmission of electromagnetic energy outside said selected frequency range being substantially prevented during both said first and second operating modes. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A structure for selectively transmitting electromagnetic energy through a waveguide, said structure comprising
at least one shutter means being mounted in said waveguide and including at least one continuous conductive element extending in a selected direction substantially the entire distance from a first surface to a second surface of said waveguide; -
at least one discontinuous element having separated conductive portions and extending in said selected direction from said first surface to said second surface of said waveguide; at least one diode means interconnecting the separated portions of said at least one discontinuous conductive element; and means for biasing said at least one diode means in a non-conductive direction during a first operating mode so that such shutter means is substantially resonant to electromagnetic energy incident thereon within a selected frequency range so as to permit the substantial transmission of said incident energy within said selective frequency range through said waveguide and for biasing said at least one diode means in a conductive direction during a second operating mode so that such shutter means substantially prevents the transmission of electromagnetic energy through said waveguides within and outside of said selected frequency range. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification