Asghar Mousazadeh - Department of Engineering, Science and Research branch, Islamic Azad University, Tehran, Iran
M Naser-Moghaddasi
Fatemeh Geran
Saeid Mohammadi - Department of Electrical Engineering, Urmia University, Urmia, Iran

This letter presents a new wideband circularly polarized square slot antenna (CPSSA) with a coplanar waveguide (CPW) feed. The proposed antenna is composed of two arc-shaped and inverted-L grounded strips around opposite and mirror corners of the square slot. In this antenna the impedance bandwidth and the axial ratio bandwidth (ARBW) are increased compared to the previous CPSSA structures. For the optimized antenna prototype, the measured 3dB axial ratio bandwidth is 76% (3-6.7 GHz) and the measured VSWR < 2 impedance bandwidth is as large as 108% (3-10.1 GHz). Throughout this letter, the improvement process of the axial ratio (AR) and S11 properties are presented and discussed in detail.

Axial ratio (AR), broadband, circularly polarized (CP), square slot antenna