A Circularly Polarized Wide Slot Antenna for WLAN Applications

A simple circularly polarized square slot antenna is presented in this communication for WLAN applications. The main intention of this proposed work is to design a CPW fed wideband circularly polarized (CP) planar antenna by introducing a wide square slot at the center and a chifre shaped radiator within the square slot. To attain wide axial ratio bandwidth within the desired frequency range, perturbation has been done in the ground plane by introducing a rectangular strip at the lower left corner and inverted-L at the top right corner of the slot. The design simplicity of this CP antenna is another advantage here. Size of the antenna is 44×44×1.6mm
³
at lowest CP frequency. Impedance bandwidth and AR bandwidth of the antenna are 47% (4.14GHz-6.68GHz) and 11% (5.03GHz-5.61GHz) respectively, corresponding to the lowest CP resonating frequency. The peak gain of the antenna is dB within the operating CP band. Steps of the antenna design are discussed in detail in the following sections.