Abstract
A unidirectional low-cost broadband high gain circularly polarized (CP) cylindrical loop-monopole composite antenna is presented for a navigation system, satellite system, GPS (1.575 GHz) and GLONASS (1.602 GHz) bands. The antenna has a simple structure with coaxial feeding, and is used to achieve circular polarization with an orthogonal shorting strip. The proposed antenna is designed by metal and no external feeding network is used, so antenna is less in cost and low in complexity. An optimized antenna is designed and measured, the measured results agree well with the simulated results. The results show good performance of impendence bandwidth (IBW) with approximately 58.8% (1.2–2.2) GHz and the simulated 3-dB axial-ratio bandwidth (ARBW) of approximately 18.5% (1.45–1.75 GHz). Moreover, the measured broadside antenna gain is stable and almost constant of average value 9.5 dBi with less than 0.3 dB variation within the 3 dB ARBW. The mathematical analysis of resonance frequency is also studied for a cylindrical loop and monopole radiators.
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