JSTS:Journal of Semiconductor Technology and Science

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Bandpass Filters using T-shape Stepped Impedance Resonators for Wide Harmonics Suppression and their Application for a Diplexer

  • Lerdwanittip, Reungyot (Department of Electrical Engineering, Faculty of Engineering, King Mongkut's University of Technology North Bangkok) ;
  • Namsang, Apirada (Department of Electrical Engineering, Faculty of Engineering, King Mongkut's University of Technology North Bangkok) ;
  • Akkaraekthalin, Prayoot (Department of Electrical Engineering, Faculty of Engineering, King Mongkut's University of Technology North Bangkok)
  • Received : 2010.10.30
  • Accepted : 2010.12.23
  • Published : 2011.03.31
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Abstract

In this paper, the T-shape stepped impedance resonators are adopted for the design of microstrip bandpass filters for wide harmonics suppression. The proposed filters are operated at the center frequency of 2.44 GHz and 5.20 GHz, respectively. These bandpass filters have been also applied for a high performance diplexer. The insertion losses at the center frequencies of 2.44 and 5.20 GHz are 1.23 and 1.18, respectively. The applicable return losses for both frequency bands and a wide stopband better than 17 dB up to 20 GHz have been obtained.

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References

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