Synthetic dielectric material for broadband-selective absorption

Details Synthetic dielectric material for broadband-selective absorption Synthetic dielectric material for broadband-selective absorption

1982-05-26

1994-03-29

Tubbesing, T. H.

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

Radio wave absorber

With particular geometric configuration

H01Q 1700

Patent

active

052989038

ABSTRACT:
Ingredients of loaded dielectric media are specified for the achievement of high absorption and/or high reflection of electromagnetic power over very broad frequency bands and with very low material mass requirements on the absorbing or reflecting agents. The loading consists of dilute distributions of small metallic particles specified in terms of their individual properties, namely electrical conductivity, permeability, size, shape, and their collective properties, i.e., number densities, metallic volume fractions. The required permittivities of sustaining dielectrics and the thicknesses or penetration depths for absorption or reflection of the loaded media are also specified. These particulate and supporting dielectric properties are scaled with respect to the electromagnetic wavelength or frequency bands for the achievement of the desired percentage power absorption and/or reflection (in nonoverlapping bands). The invention applies to all frequencies below visible optical. Typical volume fractions for aluminum are 10.sup.-8 for greater than 95% absorption and 10.sup.-6 for greater than 95%. reflection.

REFERENCES:
patent: 3441933 (1969-04-01), Tuinila et al.
patent: 3721982 (1973-03-01), Wesch
patent: 4371742 (1983-02-01), Manly
patent: 5212488 (1993-05-01), Konotchick

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