Absorbing rubber sheet mixed with carbon for X‐band marine radar frequencies

Abstract
The conventional rubber radio wave absorber consisting of a rubber sheet mixed with ferrite is quite heavy. In order to reduce its weight the authors use chloroprene rubber with carbon added. The dielectric constants are measured using such absorbers with various kinds of carbon. Anisotropy generated in the dielectric constant during rolling is also investigated. Based on these data a radio wave absorber is designed and fabricated for X‐band marine radar (9.4 GHz). The practical utility of this radio wave absorber is confirmed. The present absorber has half the weight of the ferrite‐rubber absorber and hence is useful for covering large bridge structures.

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