Wide Beamwidth Circularly Polarized Slot Loaded Microstrip Patch Antenna

摘要

The coupled fields between the slots are physically analyzed for wide 3-dB axial ratio beamwidth (ARBW) of a circularly polarized (CP) antenna. The square shaped CP antenna is decorated with a rectangular slot along one diagonal line of the patch and a pair of cross slots along another diagonal line. Dimensions of cross slots play a crucial role in adjusting the 3-dB ARBW of this CP antenna. This antenna offers the impedance bandwidth (IBW) of 83 MHz (2.443-2.526 GHz), CP bandwidth (CPBW) of 17 MHz (2.4462.463 GHz), and a maximum realizable gain of 4.28 dBic. The proposed left handed CP (LHCP) antenna exhibits wide 3-dB ARBW of 224° and 212° at Φ =0° and Φ=90° planes, respectively.