DESIGN OF TEMPLE SHAPE SLOT ANTENNA FOR ULTRA WIDEBAND APPLICATIONS

Abstract

A novel design of a temple shaped printed slot antenna for circular polarization applications is presented in this paper. The slot, half trapezoidal and half semi-circular in shape, is excited by a 50› CPW feed terminated with a tuning stub. Modiflcations of the initial design for improving return loss and circular polarization characteristics are proposed and discussed. The antenna is very compact (40mm £ 35mm) in size and simple to design. The flnal version of the antenna ofiers an experimentally measured impedance bandwidth of 108%, i.e., from 2.75GHz to 9.25GHz. The 3-dB axial ratio bandwidth achieved is 51.6%, i.e., from 4.6GHz to 7.8GHz. The antenna is further characterized by a peak gain of about 5dB and a relatively stable radiation pattern in the useful band.