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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Transversal wideband bandpass filter with a wide stopband and multiple transmission zeros

  • Wang, Li-Tian (College of Electronic Information and Optical Engineering, Nankai University) ;
  • Xiong, Yang (College of Electronic Information and Optical Engineering, Nankai University) ;
  • Wang, Zhi-Peng (College of Electronic Information and Optical Engineering, Nankai University) ;
  • Gong, Li (College of Electronic Information and Optical Engineering, Nankai University)
  • Received : 2019.10.10
  • Accepted : 2020.03.09
  • Published : 2021.02.01
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Abstract

Herein, we present a compact transversal bandpass filter (BPF) with an extremely wide upper stopband and multiple transmission zeros (TZ). Three signal transmission paths with shorted stubs and open-coupled lines allow signal transmission from input port to output port. Two resonant modes can be excited simultaneously and managed easily for bandpass response. Eleven TZs are achieved via transmission path cancelation; an extremely wide upper stopband with an attenuation level better than -12 dB is achieved up to 11.7 f0, where f0 is the center frequency (CF). In addition, bandwidth and CF can be controlled by adjusting electrical lengths. For proof of concept, a wideband BPF centered at 1.04 GHz with 3 dB fractional bandwidths of 49.2% was designed, fabricated, and evaluated. The overall circuit measures 0.045λg × 0.117λg; good agreement was observed between the measured and simulated results.

Keywords

Acknowledgement

Nankai University; National Natural Science Foundation of China, Grant/Award Number: 61101018, 51002081, 61171028.

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