Abstract
The paper presents a novel design for a circularly polarized square slot antenna (CPSSA). The antenna is fed by a coplanar waveguide. An asymmetric slot on the ground is applied to create the circularly polarized wave. By adding two orthogonal stubs embedded on the microstrip feeding-line, both the impedance bandwidth and the axial ratio bandwidth of antenna are increased. The results show that 3dB axial ratio (AR) bandwidth and the impedance bandwidth with S11<;-10dB are 59.2% (1.63 GHz) and 84% (2.1 GHz), respectively.
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