Broadband Circularly polarized Sequential-Rotation Array Antenna with Compact Sequential- Phase Feed

A miniaturized circularly polarized microstrip antenna array with sequential-phase (SP) feed is presented. Attributed to slotted metal walls surrounding the SP feed, an internally slotted patch array and parasitic rectangular patches, the key Performance Indicators of the antenna like the gain and the impedance bandwidth are greatly enhanced. The final results of the stimulation-testing by ANSYS HFSS show that the antenna obtains an impedance bandwidth of about 11.89% (5.41-6.09GHz) for S
₁₁
<; - 10-dB, a 3-dB Axial Ratio (AR) bandwidth of about 13.26% (5.64-6.44GHz), and a peak gain of 11.86dBi at 6.09GHz. When the center frequency of this antenna is operated at 5.87GHz, the usable bandwidth is 7.71% (5.64-6.09 GHz). At this point, the AR bandwidth of 450MHz is obtained.