A DOUBLY PERIODIC MOMENT METHOD SOLUTION FOR THE ANALYSIS AND DESIGN OF AN ABSORBER COVERED WALL

The periodic moment method (PMM) solution for scattering from a doubly periodic array of lossy dielectric bodies is developed in this paper. The purpose of this study is to design electromagnetic wedge and pyra midal absorber for low reflectivity so that one can improve the perfor mance of anechoic chamber measurements. The spectral-domain formulatio n and the moment method volume polarization current approach are appli ed to obtain the expressions used to determine the scattering from a d oubly periodic array of lossy dielectric bodies. Through these studies , some wedge and pyramidal absorber configurations have been designed, fabricated, and then tested in the OSU/ESL compact range measurement facility. In this paper, wedge absorber, commercial pyramidal absorber , and some low-frequency pyramidal absorber designs are presented. By considering the complexity of dealing with real-world material structu res, good agreement between calculations and measurements has been obt ained.