Accurate determination of input parameters of rectangular microstrip patch antenna on thick substrate and comparision of several models

Theoretical models like standard cavity model, multipart cavity model (MCM), MOM-based commercial software, and Ensemble do not provide accurate results on the resonance frequency, input impedance, and bandwidth for the rectangular patch on the thick substrate (h > 0.05 λ_g). This paper reports an improved form of the cavity model called the modified Wolff model (MWM) that computes accurately these parameters of the rectangular patch on the thick substrate up to the substrate thickness 0.229 λ_g. We also compare all of these models against the experimental results obtained from the several sources. The MWM comes out as the most accurate model for the computation of input parameters of the rectangular patch both on the thin and thick substrates also having anisotropy.