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A monofilar spiral slot antenna with a cavity-backed reflector is described. presented, which can achieve the performance of the wide Axial Ratio beamwave for Global Positioning System GPS system. It comprises an arrangement of a single printed spiral slots fed by a 50 Ω microstrip line. By using cavity-backed covering the slot structure, a wide axial ratio beamwidth performance is achieved in the GPS L1 frequency. The angle with less than 3 dB axial ratio at 1.575 GHz in the YoZ plane is about 215 degree. The measured results show that the HPWB beamwidths at 1.575 GHz are 100 degree in the YoZ plane, respectively. The peak gain is 5.5 dBic.
Bao, X. & Ammann, M. (2014) A Cavity-Backed Spiral Slot Antenna with Wide Axial Ratio Beamwidth for GPS System. Microwave and Optical Technology Letters, Vol. 56, Issue 5, May. doi:10.1002/mop.28255