An Improved Design and Implementation of a Broadband Circularly Polarized Antenna

作者：Lee Chien Hsing^*; Chang Yu Han

来源：IEEE Transactions on Antennas and Propagation, 2014, 62(6): 3343-3348.

DOI：10.1109/TAP.2014.2309962

• Broadband circularly polarized antenna
• phase shifter
• slot antenna
• Wilkinson power divider

This communication presents an improved design and implementation of a broadband circularly polarized antenna that features a size reduction, good axial-ratio bandwidth and good return loss bandwidth. The circuit comprises one Schiffman phase shifter that is used to obtain a wideband phase difference of 90 degrees, and a pair of orthogonally positioned linearly polarized slot antennas with equal radiation strength that are used to accomplish a circular polarization by combining the horizontally and vertically polarized waves with a Wilkinson power divider. Measured results show that the 3 dB axial-ratio bandwidth of the proposed antenna can reach 81.5% (1.6-3.8 GHz), and the 10 dB return loss bandwidth is 100% (1.48-4.47 GHz).

• 出版日期2014-6