Design of compact broadband circularly polarised bowtie patch antenna

Abstract

This paper presents a novel circular polarization broadband microstrip antenna: the familiar bowtie shaped patch antenna, which is fed by a proximity-coupled T-shaped micrpstrip-line. A H-shaped slot is incorporated into the patch of the microstrip patch to realize it miniaturization. The simulation results show that the impedance bandwidth and axial ratio bandwidth is 13% and 3% respectively. An acceptable axial ratio (AR ≪ 2) is obtained in a broad angular range from −90 to 90 degrees from boresight. The optimized radiation pattern is also presented.