Electromagnetic radiation absorber and method for the production

Details Electromagnetic radiation absorber and method for the production Electromagnetic radiation absorber and method for the production

1985-02-12

1996-10-01

Hellner, Mark

Communications: directive radio wave systems and devices (e.g.,

Radio wave absorber

H01Q 1700

Patent

active

055614280

ABSTRACT:
Disclosed herein is an electromagnetic radiation absorber comprising a filamentary, three-dimensional, porous substrate of dielectric material having a relatively thin layer of electrically conductive material deposited thereupon. The layer is characterized by a generally gradual and continuous reduction in its thickness or bulk with inward progression into the substrate from one side thereof, thus resulting in a layer exhibiting a graduated resistivity. A filler substantially pervious to the radiation of interest may be disposed in the interstitial voids between filaments, and relatively small diameter magnetic/magnetizeable particles may be suspended in the filler to thereby further extend the useful frequency range of the absorber. Also disclosed is a sputtering method for producing such an absorber.

REFERENCES:
patent: 2293839 (1942-08-01), Linder
patent: 2977591 (1961-03-01), Tanner
patent: 3568196 (1971-03-01), Bayrd
patent: 4012738 (1977-03-01), Wright
patent: 4287243 (1981-09-01), Nielsen
patent: 4538151 (1985-08-01), Hatakeyama et al.
Sands et al., "Darkflex a Fibrous Microwave Absorber", NRL Report, 1953.
McMillan Industrial Corporation, "Microwave Absorbers", Technical Publication, Circa 1957.

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