Determining resonant properties of arbitrarily shaped planar antennas

The authors propose a CAD approach based on a combination of the spectral-domain approach (SDA) and the method of lines (MOL), called the space-spectral domain approach (SSDA). This method was developed in particular for the analysis of arbitrarily shaped 3-D planar circuits. For this application the new approach is numerically very efficient, since most of the unfavorable properties commonly known from either the 2-D SDA or the 2-D MOL are avoided. In terms of the computer power and memory space required, the SSDA is superior to practically all of the previously published numerical techniques. The main steps in the SSDA are explained with reference to an arbitrarily shaped microstrip resonator.<>