An annular-ring slot antenna with pair truncated corners for CP operation

An annular-ring slot antenna with pair of slits and truncated corner for CP operation is proposed. The proposed antenna is fabricated and simulated to analysed the radiation characteristic. Simulated results show a good agreement with experimental results. A pair of slits and truncated corners are used to enhance axial ratio bandwidth. Antenna also shows much larger CP bandwidths than earlier reported results. The measured impedance bandwidth and 3-dB Axial Ratio band width of the proposed antenna are 94.2% and 73.8%, respectively. The proposed antenna shows consistent return loss and radian pattern for entire frequency range.