Extension of the operating frequency range of a dielectric radio absorber with the help of frequency-selective surfaces

Abstract

A detailed study of the efficiency of frequency-selective surfaces for extension of the operating frequency range of a dielectric radio absorber is presented. The radio absorber is fabricated from the layer of a homogeneous carbon black filled material and a frequency-selective surface made of thin metal rings placed inside or on the surface of the absorber. It is shown theoretically and experimentally that insertion of a frequency-selective surface into a dielectric radio absorber makes it possible to almost double the range of operating frequencies without increasing the thickness of the absorber.