Communications: directive radio wave systems and devices (e.g. – Radio wave absorber – For aircraft or missile
Patent
1997-02-13
1998-12-01
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Radio wave absorber
For aircraft or missile
342 4, H01Q 1700
Patent
active
058445188
ABSTRACT:
The microwave absorption performance of a fiber loaded thermoplastic syntactic material is improved by geometrically reshaping the surface into a waffle shape. Starting with a fiber loaded version of thermoplastic syntactic foam, the front face geometry is then modified. Typically, the angle and frequency response is a function of both the front face angle and the skin thickness. These effects are minimized in this concept by using a pyramidal surface in which the field enters the material normal to at least one surface at almost all incident angles. The attenuation is over 20 dB, from S through Ku bands, over a broad angle range of up to 75 degrees off normal. An added benefit is that this system has a rigidity that is suitable for many structural applications.
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Berg Donald J.
Brooker David A.
Mentzer Carl A.
Sapletal Gregory J.
McDonnell Douglas Helicopter Corp.
Mullins Kenton R.
Sotomayor John B.
Stout Donald E.
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