Radio frequency absorbing windows

Communications: directive radio wave systems and devices (e.g. – Radio wave absorber

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H01Q 1700

Patent

active

054883717

ABSTRACT:
A light transparent window is fabricated to absorb a band of radio frequency (RF) energy with minimal RF transmission and reflection. The window is formed from a series of parallel electrically conductive sheets separated by absorbing cavities. The conductive sheets are formed by depositing a layer of doped semiconductor material onto a thin layer of sapphire. The absorbing cavities are formed by an air-filled space between the conductive sheets. Radio frequency reflection can be further attenuated by an antireflection coating, which is preferably realized by a non-conducting sapphire sheet separated from the series of conductive sheets by an air-filled space. Depending on the number of cavities, reflection and transmission attenuation of over 25 dB can be obtained for radio frequency energy in the 2 to 18 GHz band.

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Knott, E. F., et al., "Radar Cross Section," Second Edition, consisting of pp. 9, 320-325, and 327.
Pazol, B. G., et al., "Development of sapphire windows for use in high-quality IR imaging systems," SPIE vol. 1760 Window and Dome Technologies and Materials III, pp. 55-65, (1992).

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