Analysis of frequency selective surfaces using a conjugate gradient method

Analysing frequency selective surfaces (FSS) often requires solving integral equations that may have asymmetric and singularly behaved kernels. The results are presented from two separate but related studies that employ a preconditioned conjugate gradient iterative scheme as a means of predicting the radiation performance of single and multiple layer FSS. The first study is concerned with a finite array of conducting elements. The effect of the dielectric substrate and the size of the array to the scattered field is examined. An iterative scheme is developed to solve a set of integral equations for a multilayer array where each layer is assumed to be of infinite extent. The analysis takes into account the interlayer coupling as well as the dielectric substrates adjacent to the array elements