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摘要
A novel feeding mechanism for realizing circular polarization characteristic is presented in this paper. Detailed theoretical analysis proves that a circular microstrip antenna, which is excited by three centrosymmetric feeds with equal amplitudes and relative 120 degrees. phase shifts, can obtain good circular polarization. This circular microstrip antenna is designed to work on TM11 mode. Good equal input powers with relative 120 degrees. phase shift for three feeds are provided by a Wilkinson power divider with three phase-adjusting transmission lines. Probe feeding for the radiating patch is accomplished by vertical via holes through the substrate material. The measured results show that the proposed antenna obtains a 10 dB return-loss impedance bandwidth of 22.3% and a 3 dB axial-ratio CP bandwidth of 18.9%, with the peak gain of 7.0 dBi. Additionally, the measured symmetrical radiation patterns are in good agreement with the simulated ones.
- 出版日期2010
- 单位西安电子科技大学
