Threshold sensitive low visibility reflecting surface
First Claim
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1. A threshold energy, microwave switchable, electromagnetic energy reflecting surface comprising:
- a surface member having first surface portions reflective of electromagnetic energy andsecond surface portions including a sufficient number of polarization insensitive elements to render said surface member invisible for at least one predetermined frequency band of incident electromagnetic energy; and
threshold radiation sensitive means having a predetermined threshold intensity level and connected to each said element and rendering said element electrically conducting only when microwave radiation of at least said predetermined threshold intensity level is incident upon said threshold radiation sensitive means.
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Abstract
A non-linear solid state conductor placed across a resonant aperture formed in a surface reflective of electromagnetic energy becomes conductive under the influence of a microwave field above a threshhold energy level of intensity to render the resonant aperture fully reflecting for the bandwidth of frequencies associated with the geometry of the resonant aperture.
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Citations
14 Claims
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1. A threshold energy, microwave switchable, electromagnetic energy reflecting surface comprising:
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a surface member having first surface portions reflective of electromagnetic energy and second surface portions including a sufficient number of polarization insensitive elements to render said surface member invisible for at least one predetermined frequency band of incident electromagnetic energy; and threshold radiation sensitive means having a predetermined threshold intensity level and connected to each said element and rendering said element electrically conducting only when microwave radiation of at least said predetermined threshold intensity level is incident upon said threshold radiation sensitive means.
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2. A threshold energy, microwave switchable, electromagnetic energy reflecting surface, comprising:
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a surface member having a first surface portion reflective of electromagnetic energy; a plurality of polarization insensitive elements forming an array of second surface portions on said surface member for rendering said surface member invisible for at least one predetermined frequency band of incident electromagnetic energy; and threshold radiation sensitive means connected to said elements for rendering said elements electrically conducting only when microwave radiation at or above the threshold intensity level of said means is incident upon said means whereby said surface member is rendered reflective of incident electromagnetic energy at said predetermined frequency band. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A remotely switchable, electromagnetic energy, reflector, comprising:
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a surface reflective of electromagnetic energy; an array of radiating elements provided in said surface with selective transmission and reflection properties; and means for electrically decoupling said array of radiating elements from said surface for making said surface entirely reflecting, wherein said decoupling means is operative only at or above a preselected threshold level of electromagnetic energy incident upon said surface.
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Specification