Communications: directive radio wave systems and devices (e.g. – Radio wave absorber
Patent
1994-04-29
1996-01-30
Hellner, Mark
Communications: directive radio wave systems and devices (e.g.,
Radio wave absorber
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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Hellner Mark
Litton Systems Inc.
Wallach Michael H.
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