A Novel Compact Size Circularly Polarized Microstrip Antenna

A novel L band compact size left hand circularly polarized(LHCP) microstrip antenna loaded with slots and parasite strips is designed in this paper. Based on the conventional circularly polarized microstrip antenna, three miniaturization methods are applied for size reduction, including applying annual-ring shape, slotting on the patch and loading parasite elements. The dimensions of the final design including ground plane is 40mm × 40mm × 10mm (0.26λ
₀
× 0.26λ
₀
× 0.06λ
₀
). Simulated results show that the antenna has a peak gain of 4.58 dB at the center frequency of 1.95 GHz. 3 dB axial ratio bandwidth and -10dB impedance bandwidth are 63.1%, and 4.3% respectively.