Abstract
A coplanar waveguide-fed slot antenna with wideband circular polarization characteristic is presented. The proposed antenna consists of an irregular slot with a stair-shaped edge and an L-shaped feed line. The stair-shaped edge can improve the circular polarization of the antenna. The simulated and measured results show that the antenna has an impedance bandwidth (VSWR < 2) about 1040MHz (42%@2.47GHz) and an axial ratio (AR) bandwidth (AR < 3dB) about 640MHz (25.8%@2.48GHz) for 2.45GHz RFID applications. The RHCP gain in the main radiation direction varies between 2.3dBi and 3.8dBi.
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