Circular Ring Microstrip Antenna with Elliptical Slot

Abstract

A circular ring sicrostrip antenna with an elliptical slot on its center is nuaerically and experimentally analyzed for the circular polarization. In the numerical analysis, the antenna is modelled as a cavity with finite admittance wall on its inner and outer apertures. The electro magnetic fields vithin the dielectric substrate are expressed in terms of Bessel and trigonometric functions. By applying the method of least-square to the impedance boundary condition at apertures. the fields are determined. constructive parameters for clrcular polarization are evaluated.