Communications: directive radio wave systems and devices (e.g. – Radio wave absorber – With particular geometric configuration
Patent
1995-05-09
1997-06-24
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Radio wave absorber
With particular geometric configuration
H01Q 1700
Patent
active
056421184
ABSTRACT:
An apparatus for providing broadbanded electromagnetic radiation attenuation is disclosed. The apparatus comprises a surface mount to which a plurality of protuberances are mounted. Each protuberance is further made up of a plurality of impedance sheets that are substantially concentric one with another. The impedance sheets are directionally shaped so as to enhance absorption of any polarization of plane wave radiation from any incidence direction including near grazing incidence. The impedance sheets have impedance values which are tapered with higher impedance values belonging to the sheets farther away from the concentric center. These sheets may be either substantially spherical, hemispherical, or circular cylinders. The distance separating neighboring impedance sheets is selected according to the shortest wavelength for which good electromagnetic attentuation is desired. Further, additional layers of attenuation materials may also be provided, which comprise substantially the same materials as the first layer, namely additional pluralities of protuberances and additional pluralities of directionally shaped impedance sheets.
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Bradley James E.
Lockheed Corporation
Sotomayor John B.
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