S-PARAMETER ANALYSIS OF MULTISLOT MICROSTRIP PATCH ARRAYS - SPECTRAL-DOMAIN APPROACH

A generalised full-wave model for the evaluation of the mutual couplin g in multislot-coupled microstrip patches is presented. The approach a llows coupling between slots in a single patch or between patches in a finite array to be considered. The reciprocity theorem and the bounda ry conditions on the slots and patches are applied to the structure, a nd the related spectral domain integral equations are solved using Gal erkin's method of moments. Green's function for the stratified layer i s calculated by applying a transmission line approach in which equival ent circuits are defined for each stratification. Such an approach, th at of expanding the vectorial equations in the transverse domain, allo ws a scalarisation of the problem for an arbitrary number of dielectri c layers:and parasitic patches to be considered. The S-matrix formalis m of the N-port equivalent circuit of the general structure together w ith comparisons with measured reflection coefficients and mutual coupl ing are presented.