Communications: directive radio wave systems and devices (e.g. – Radio wave absorber
Patent
1992-04-17
1995-01-10
Lovering, Richard D.
Communications: directive radio wave systems and devices (e.g.,
Radio wave absorber
2523152, 2523156, 252583, 252587, 428218, 501 12, 523137, H01Q 1700, B32B 702, G02F 117, G21K 110
Patent
active
053811496
ABSTRACT:
An inhomogeneous broadband absorber of electromagnetic energy constructed from an aerogel-lossy dielectric composite, where the concentration of the lossy dielectric increase across its thickness such that the composite's dielectric properties vary from those of the aerogel to those of the lossy dielectric. Materials useful for serving as the lossy dielectric include polar molecules, polar icosahedral molecules, polyaniline electron-conducting polymers, and polyprrole electron-conducting polymers. Another inhomogeneous layer absorber is constructed from an aerogel that is intrinsically a lossy dielectric. The variation in dielectric properties is achieved by increasing the density of the aerogel across the thickness of the material. Aerogel materials for such an absorber include organic aerogels which have been pyrolized in an inert atmosphere to give vitreous carbon aerogels. Methods for fabricating these absorbers are described.
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Chow James R.
Dougherty Thomas K.
Harris Norman H.
Pierce Brian M.
Alkov L. A.
Denson-Low W. K.
Hughes Aircraft Company
Lovering Richard D.
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