Novel Topology and Design for Wideband Bandpass Filter With Frequency-and Attenuation-Reconfigurable In-Band Notch

Bin Liu, Tao Yang, Kun Li, Pei Ling Chi

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

A novel topology and the design method are proposed for a wideband bandpass filter (BPF) with frequency-and attenuation-reconfigurable in-band notch by engineering the complex frequencies of transmission zeros. The proposed topology consists of a fifth-order wideband BPF and two coupled notch resonators. With the two coupled notch resonators, a pair of complex in-band transmission zeros are formed. By controlling the frequency difference between the two notch resonators, a frequency-and attenuation-reconfigurable notch can be obtained in the passband of the wideband BPF. A matrix analysis method is presented to characterize the frequency-and attenuation-tunable in-band notch precisely. The relationship between complex transmission zeros and in-band attenuation is also investigated. To demonstrate the proposed techniques, a prototype using microstrip and evanescent mode resonators is designed and fabricated. The proposed wideband BPF exhibits a reconfigurable in-band notch with frequency tuning from 1.494 to 2.004 GHz and attenuation tuning from 2 to 79 dB. The simulated and measured results are in good agreement with each other, validating the proposed design and method.

Original languageEnglish
Pages (from-to)1-14
Number of pages14
JournalIEEE Transactions on Microwave Theory and Techniques
DOIs
StateAccepted/In press - 2022

Keywords

  • Attenuation
  • Band-pass filters
  • Complex transmission zero
  • coupling matrix
  • embedded transversal network
  • Filtering theory
  • Interference
  • Poles and zeros
  • reconfigurable notch
  • Resonant frequency
  • Wideband
  • wideband bandpass filter (BPF)

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