A Design for a Multi-Resonance Absorber using a Optimization Method

Abstract

In this paper, a optimized shape of EM wave absorber is calculated using a optimization method called Downhill Simplex Method. As a result of optimization, the necessity for periodically changing an equivalent permittivity in the direction of the thickness of EM-absorber is shown. To confirm this result, the absorber which has a periodic permittivity distribution is made and the reflection coefficient is measured. In the measurement results, the optimization shape absorber shows multi-resonance. Additionally, that absorption is 5dB to 15dB better than the conventional pyramidal absorber's performance in the 60MHz to 300MHz frequency range.