Filtering characteristics of FSS for realizing perfect magnetic conductor without frequency dependence

Abstract

This paper focuses on an AMC (Artificial Magnetic Conductor) composed of a FSS (Frequency Selective Surface) and the ground plane, and describes the ideal filtering characteristics for realizing PMC (Perfect Magnetic Conductor) which is independent of frequency. The ideal filtering characteristics is derived from the condition for realizing the PMC in all the frequency using the relational expression between the filtering characteristics of a FSS and the PMC characteristics of the AMC. As the result, it is clarified that the ideal filter is a band pass filter. It is also shown that the optimum distance h between a FSS and the ground plane is a quarter wavelengths at the band pass frequency. On the other hand, it is found that the phase rotation direction is opposite compared with the conventional band pass frequency. It is found that the ideal filtering characteristics can be realized by using negative index material.