Circularly Polarized Antenna Design Using Microstrip-To-CPW Transition for Ultra-Wideband Applications

Abstract

This paper introduces a circularly polarized monopole UWB antenna with a microstrip-to-coplanar waveguide (CPW) feed. By giving two symmetrical cuts on both sides of the radiator with opposite orientation, the impedance bandwidth as well as axial ratio bandwidth can be enhanced. An experimental prototype is fabricated and subsequent measurements are carried out. The measured impedance bandwidth covers the ultra-wideband range (3.1-10.6 GHz). The measured axial ratio bandwidth is about 1.55 GHz (16.2%) from 8.75 GHz to 10.3 GHz.