A Novel Compact CPW-Fed Antenna with Circular Polarization Characteristics for UWB Applications

A novel compact antenna with Circular Polarization (CP) characteristics is presented. The antenna structure includes an asymmetrical rectangular radiating patch from which a semi-circle shaped slot is cut. A 50 Omega Co-Planar Waveguide (CPW) feed line with two rectangular slots feeds the antenna. Two inverted L-shaped strips and also two spiral shaped slots are embedded on opposite corners of the ground plane to further enhance the antenna bandwidth and also generate the circular polarization property. The antenna is printed on a compact size FR4 substrate with the total dimensions of 20x20x1.6 mm(3). The proposed antenna operates over the frequency range of 3-14.5 GHz for VSWR<2 and exhibits CP in 5.35-7.65 GHz (35%).