Electromagnetic energy shield
First Claim
1. A structure for selectively transmitting electromagnetic energy, said structure comprising:
- at least a pair of shutter members mounted in said structure, each of said members includinga plurality of parallel paths, each path comprising a plurality of separate two-dimensional, planar conductive elements;
diode means interconnecting adjacent elements in each said path;
means for biasing said diode means in a non-conductive direction during a first operating mode so that said shutter members have substantially capacitive characteristics over a selected frequency range so as to permit the substantial transmission through said members of electromagnetic energy incident thereon within said selected frequency range and to prevent transmission outside said selected frequency range and for biasing said diode means in a conductive direction during a second operating mode so that said shutter members have substantially inductive characteristics so as to substantially prevent the transmission of electromagnetic energy through said members within and outside said frequency range.
1 Assignment
0 Petitions
Accused Products
Abstract
A radome for providing a relatively wide-band operation which in a preferred embodiment uses at least a pair of panel means mounted adjacent each other, each having a plurality of discontinuous conductive elements applied to a selected surface thereof in an array of parallel paths. The discontinuous elements in each path of the array are interconnected by diode means which can be biased in a non-conductive direction during a first transmit mode and in a conductive direction during a second non-transmit mode. The panels are separated by a distance which is substantially equal to one quarter wave length (λs /4) at a selected frequency within the wide pass-band of electromagnetic energy which is to be transmitted. The overall structure essentially operates as a wide band, low-pass transmission device transmitting energy at frequencies within the selected pass-band during the transmit mode and rejecting transmission at all frequencies within at least this same selected pass-band during the non-transmit mode.
23 Citations
12 Claims
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1. A structure for selectively transmitting electromagnetic energy, said structure comprising:
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at least a pair of shutter members mounted in said structure, each of said members including a plurality of parallel paths, each path comprising a plurality of separate two-dimensional, planar conductive elements; diode means interconnecting adjacent elements in each said path; means for biasing said diode means in a non-conductive direction during a first operating mode so that said shutter members have substantially capacitive characteristics over a selected frequency range so as to permit the substantial transmission through said members of electromagnetic energy incident thereon within said selected frequency range and to prevent transmission outside said selected frequency range and for biasing said diode means in a conductive direction during a second operating mode so that said shutter members have substantially inductive characteristics so as to substantially prevent the transmission of electromagnetic energy through said members within and outside said frequency range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification