A Broadband Circularly Polarized Antenna Fed by Coplanar Waveguide

A novel circular-polarized (CP) antenna, which is fed by a coplanar waveguide is introduced. The structure of antenna is comprised of a specific L-shaped grounded and a T-shaped strips, exhibits left-hand CP (LHCP) at the broadside direction. From the simulation results, it can be seen that from 3.0 to 6.5 GHz the 3 dB axial ratio (AR) bandwidth ranges from 3.46 to 6.10 GHz. The results of test and simulation are basically consistent. The designed antenna has many advantages, such as small size, simple structure and wideband axial ratio.