Resonant frequency of a rectangular microstrip antenna depends of the dielectric substrate parameters using the various types of current expansion function

This work consists in characterizing a rectangular microstrip antenna while emphasizing the possibilities of various types of current expansion functions. A detailed calculation of the spectral Green´s dyad, and conduction current calculated by the integral equation method via the moment´s method was treated. The numerical method consists in simulating the various types of basic functions by testing convergence and by considering the effect of the parameters of the dielectric substrate such as thickness and permittivity on resonance frequency. An application of the air gap structure was also taken into account.