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