A small frequency ratio dual-band circularly polarized microstrip antenna

@article{Liao2009ASF,
  title={A small frequency ratio dual-band circularly polarized microstrip antenna},
  author={Wen Chieh Liao and Qing-Xin Chu and Shu Du},
  journal={2009 Asia Pacific Microwave Conference},
  year={2009},
  pages={2798-2801}
}
A compact single-feed dual-band circularly polarized (CP) patch antenna with small frequency ratio is presented. The proposed antenna consists of a circular patch and a narrow annular-ring, which resonate at 1.70 GHz and 1.57 GHz for respectively. The annular-ring was involved to obtain dual band characteristic. The CP operation is achieved by an unequal cross-slot embedded in the circular patch. Simulated and measured results are presented and discussed. 

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