Ferro-electric frequency selective surface radome
First Claim
1. A ferro-electric frequency selective surface radome comprising:
- a grating screen having first and second surfaces and comprising a plurality of printed radiating elements;
inner and outer voltage controlled dielectric layers disposed on the first and second surfaces of the grating screen;
relatively high ohms per square resistive films disposed on exposed surfaces of the inner and outer voltage controlled dielectric layers; and
voltage control means coupled to the respective resistive films for controlling the voltages applied to the respective inner and outer voltage controlled dielectric layers by actively varying the dielectric permittivity of the resistive films around a small percentage of its nominal value to provide a ground on outer surfaces of the dielectric layers.
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Accused Products
Abstract
Ferro-electric frequency selective surface radomes that have dielectric layers that comprise voltage controlled material, and the electrical properties of the dielectric layers are voltage controlled. By varying the dielectric properties, the passband frequency of the radomes can be shifted to optimize frequency and angular response of the frequency selective surface. The radomes comprise grating screens having a plurality of printed radiating elements. Inner and outer voltage controlled dielectric layers are disposed on the grating screens. Relatively high ohms per square resistive films are disposed on exposed surfaces of the voltage controlled dielectric layers. In one embodiment, voltage control circuitry is coupled to the respective resistive films for controlling the voltages applied to the respective voltage controlled dielectric layers by actively varying the dielectric permittivity of the resistive films around a small percentage of its nominal value to provide a ground on outer surfaces of the dielectric layers. In another embodiment, the ferro-electric frequency selective surface radome may comprise voltage controlled dielectric layers disposed on one surface of the grating screens. Voltage control circuitry is coupled to the first and second grating screens for controlling the voltages applied thereto and thus the performance of the radome.
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Citations
5 Claims
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1. A ferro-electric frequency selective surface radome comprising:
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a grating screen having first and second surfaces and comprising a plurality of printed radiating elements; inner and outer voltage controlled dielectric layers disposed on the first and second surfaces of the grating screen; relatively high ohms per square resistive films disposed on exposed surfaces of the inner and outer voltage controlled dielectric layers; and voltage control means coupled to the respective resistive films for controlling the voltages applied to the respective inner and outer voltage controlled dielectric layers by actively varying the dielectric permittivity of the resistive films around a small percentage of its nominal value to provide a ground on outer surfaces of the dielectric layers. - View Dependent Claims (2, 3, 4)
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5. A ferro-electric frequency selective surface radome comprising:
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first and second grating screens having first and second surfaces and comprising a plurality of printed radiating elements; inner voltage controlled dielectric layers disposed on the first surface of the respective grating screens; outer dielectric layers disposed on the respective second surfaces of the respective grating screens; and voltage control means coupled to the first and second grating screens for controlling the voltages applied thereto.
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Specification