Abstract: Formulas for calculating the impedance matrix of microstrip antenna in a multilayered spherical media using Rao-Wilton-Glission (RWG) basis functions based on MoM are derived. Division of pairs of triangles is adopted to calculate the elements of impedance matrix at the junction of the probe and patch.
The complex line integral singularity can be avoided by substitution. Asymptotic items of the dyadic Green’s functions of the source and field points located on the same and different layers are extracted to accelerate convergence of the infinite series. The characteristic of a microstrip antenna in a multilayered spherical media is calculated. The results of input impedance are in good agreement with the published data, showing validity of the analysis method.

Key words:  microstrip antenna in multilayered spherical media, impedance matrix, asymptotic expression of dyadic Green’s functions, RWG basis function