Rigorous computation of a compact square patch antenna with notches using the moment method

Abstract

A new rigorous computation of a square microstrip patch antenna with dual square notches at the two corners of the diagonal using Galerkin’s method in the spectral domain is presented; the dyadic Green’s functions of the problem are well resolved by the (TM, TE) representation. The spectral domain formulation of this square patch antenna with square notches for circular polarization and printed on an isotropic substrate is developed and calculated based on the study of a simple square patch antenna. Comparisons of the left hand circular polarization (LHCP) and right hand circular polarization (RHCP) patterns at various planes with different frequencies are also presented. Moreover, the effect of some parameters on the radiation characteristics of this proposed square patch with square notches has been investigated. The proposed structure is attractive and do not require exterior circuitry or large space compared to other designs that impose stacked multilayer configurations or a complex matching system to create circular polarization. Furthermore, this proposed structure exhibits the advantage of the simplicity of the design which needs only the cutting of two identical squares at the two opposite edges of the square patch, and; hence, requires only the same dimensions of the square notches at two corners of the diagonal to be determined.