Dynamic filter structures
First Claim
1. An electromagnetic wave interactive structure, comprising:
- a first material providing a first response from incident electromagnetic waves;
a second material having a first phase providing said first response from said incident electromagnetic waves and a second phase providing a second response from said incident electromagnetic waves; and
said first material and said second material forming a geometric grid switchable mesh filter structure effective to provide first mesh filter and reflectance characteristics relative to incident electromagnetic waves of a given frequency when said second material is in said first phase and second mesh filter and reflectance characteristics relative to incident electromagnetic waves of said given frequency when said second material is in said second phase, said geometric grid switchable mesh filter structure comprising means resonating with said incident electromagnetic waves of said given frequency in at least one of said first and second phases.
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Accused Products
Abstract
An electromagnetic wave interactive structure is provided for forming a transmitted electromagnetic wave response which is a function of the frequency of the incident wave. A phase transition material selected from the transition-metal oxides, dynamic nonlinear materials, the rare earth monochalcogenides and the organometallics is provided in geometric relationship with a fixed metallic structure. The phase transition material is then switched between a dielectric phase and a metallic phase to alter the response of the composite structure. Thus, an inductive mesh may be switched to a reflective surface (FIG. 8); an inductive band-pass changed to a reflective surface (FIG. 9); a capacitive band-stop response to an inductive band-pass response (FIG. 10); a capacitive band-stop response changed to a reflective surface (FIG. 11); a capacitive mesh response to an inductive band-pass response (FIG. 12); and a capacitive band-stop response switched to an inductive mesh response (FIG. 13). The ability to switch the response characteristics of an electromagnetic wave interactive structure provides useful applications in such devices as optical hardening systems, agile aperture devices and polarizing devices using bi-refringent structures.
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Citations
29 Claims
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1. An electromagnetic wave interactive structure, comprising:
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a first material providing a first response from incident electromagnetic waves; a second material having a first phase providing said first response from said incident electromagnetic waves and a second phase providing a second response from said incident electromagnetic waves; and said first material and said second material forming a geometric grid switchable mesh filter structure effective to provide first mesh filter and reflectance characteristics relative to incident electromagnetic waves of a given frequency when said second material is in said first phase and second mesh filter and reflectance characteristics relative to incident electromagnetic waves of said given frequency when said second material is in said second phase, said geometric grid switchable mesh filter structure comprising means resonating with said incident electromagnetic waves of said given frequency in at least one of said first and second phases. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A thin film switchable grid for affecting incident electromagnetic waves, comprising:
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a conductive grid in a first filter configuration; and a phase transition material at locations spanning between selected portions of said conductive grid, and switchable between first and second phases, said conductive grid and phase transition material comprising a switchable geometric mesh filter structure for providing first mesh filter and reflectance characteristics relative to incident electromagnetic waves of a given frequency range when said phase transition material is in its first phase and second mesh filter and reflectance characteristics relative to incident electromagnetic waves of said given frequency range when said phase transition material is in its second phase, said switchable geometric mesh filter structure comprising means for resonating with incident electromagnetic waves of said given frequency range when said phase transition material is in at least one of said first and second phases. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 28, 29)
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26. A bi-refringent structure, comprising:
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a main element having a vertical and a horizontal cross member; and a phase transition element for varying the effective length of at least one of said cross members for selectively affecting polarized electromagnetic waves and switchable between first and second phases, said main element and phase transition element comprising a switchable geometric mesh filter structure for providing first mesh filter and reflectance characteristics relative to incident electromagnetic waves of a given frequency range when said phase transition element is in its first phase and second mesh filter and reflectance characteristics relative to incident electromagnetic waves of said given frequency range when said phase transition element is in its second phase, said switchable geometric mesh filter structure comprising means resonating with incident electromagnetic waves of said given frequency range when said phase transition material is in at least one of said phases.
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Specification