Development of an elliptical annular ring microstrip antenna with sine wave periphery

Abstract

We have investigated elliptical annular ring microstrip antennas having a sine wave periphery both theoretically and experimentally. The proposed antenna gives a good circular polarization at the center frequency of 1.285GHz, with measured 3dB axial ratio bandwidth of about 0.73% (9.5MHz) and impedance bandwidth of about 1.7% (22.0MHz). Input and radiation characteristics are also examined for different sine wave amplitudes applied to the periphery of elliptical ring patch antenna.