抄録
In general, there are two types as practical microwave absorbers; resonant or graded dielectric. Especially the resonant absorber is used as the simplest type of absorber which consists of a resistive sheet spaced one-quarter wavelength from a conductive ground plane. In this study, we propose the new type of resonant absorber which consists of magnetic (Fe) and dielectric (TiO2) composite material, metal pattern sheet, no loss dielectric material and metallic plate at the back. The composite microwave absorber with metal pattern sheet was applied in the design of a microwave absorber for high frequency region. The central frequency of absorption and the reflection loss could be controlled by changing the size and interval of metal pattern. By optimizing composition of absorbing layer and geometry of metal pattern, thinner and lighter composite microwave absorber with metal pattern satisfied the necessary conditions of central frequency 5.8 GHz and reflectivity -20 dB or more around for ETC use in Japan.
