A periodic finite-difference method for microwave absorber analysis and design

Presents a differential equation solution to periodic surfaces lined with microwave dielectric absorbers. This periodic finite difference (PFD) frequency domain method maintains all the advantages that surface integral equation (SIE) and volume integral equation (VIE) methods have. However, the PFD method only solves a banded system matrix instead of a full one. As a result, a great saving of computation resources has been achieved. Moreover, due to its differential equation formulation. the analysis of both electric and magnetic loaded absorbers requires only a trivial modification of the computer code. The study is of particular relevance to radar cross-sections and anechoic chambers.