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A Novel Dual-Mode Bandpass Filter Based on a Defected Waveguide Resonator

  • Guan, Xuehui (School of Information Engineering, East China Jiaotong University) ;
  • Fu, Wei (School of Information Engineering, East China Jiaotong University) ;
  • Liu, Haiwen (School of Information Engineering, East China Jiaotong University) ;
  • Ahn, Dal (Department of Electrical Communication Engineering, Soonchunhyang University) ;
  • Lim, Jong-Sik (Department of Electrical Communication Engineering, Soonchunhyang University)
  • Received : 2011.01.27
  • Accepted : 2011.04.07
  • Published : 2011.12.31
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Abstract

A novel dual-mode bandpass filter (BPF) using a dual spiral-shaped defected ground waveguide (DGW) resonator is proposed in this letter. The dual-mode characteristic of this filter is achieved by loading a defected T-shaped stub at the midline of the spiral-shaped DGW resonator. Also, non-orthogonal input and output feed-lines are adopted in the filter. Based on the compact DGW structure, a dual-mode BPF with central frequency of 1.5 GHz for the global positioning system is designed, fabricated, and measured. Measured results agree well with the predicted response and verify the proposed methodology.

Keywords

References

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