Characteristics of circular polarization of elliptical microstrip antenna with full-wave analysis considering the attachment mode

In this paper, we present the characteristics of circular polarization of a n elliptical microstrip patch fed by a coaxial probe through the method of moments in conjunction with the reaction integration method After obtaining the general Green's function, the input impedance was calculated by superp osition of two circular patches whose radii pertain to the major and minor axes of the elliptical parch, respectively, and then the characteristics of circular polarization are shown. The attachment mode was contained to ensu re the continuity and singularity of the currents at the patch-probe conjun ction point, and plays a role in accelerating the convergence for solving m atrix equations. Results showed that the elliptical patch can be used to ge nerate circular polarization characteristics with one probe feed, and attac hment modes also should be contained in the formulation to obtain the exact impedance. (C) 1999 John Wiley & Sons, Inc.