Wideband circularly polarized single probe‐fed patch antenna

A wideband circularly polarized single‐patch single probe‐fed patch antenna is investigated for applications of GPS L5, L2 and Galileo E5a, E5b bands. The wideband circular polarization (CP) is achieved by corner‐truncated square patch and insertion of a thick air layer between the radiating patch and the ground plane. A conducting circular disc is etched on the back side of the substrate to compensate the long inductive probe. The obtained 3‐dB axial ratio (AR) CP bandwidth for 25 and 28.5 mm air layer are 5.9% (71 MHz) and 6.4% (77 MHz), respectively. The later covers the all lower L bands of GPS and Galileo. The realized antenna gain reaches 6.45 dBi over the 3‐dB AR bandwidth. The measured and simulated results are in excellent agreement.