“…In addition, circularly polarized (CP) antennas have been a unique choice for stable communication due to their resilience to multipath interference and polarization mismatching between receiving and transmitting antennas. These features make CP antennas the desirable candidate for numerous applications including satellite communication, radar communication, randomly oriented RFID (radio frequency identification) tags, GPS (global positioning system), and sensors [ 3 , 4 , 5 , 6 , 7 , 8 , 9 ]. Therefore, the design of CP antennas has always been a hot topic for antenna designers, compared with linear polarized (LP) antennas.…”