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Evanescent-Mode Waveguide Filter with Transmission Zeroes Created by Shorted Waveguide Shunted in Coupling Region

  • Liu HeEmail author
  • Xingjian Zhong
  • Zhendong Fan
  • Quan Zhang
  • Wei Zhang
Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 517)

Abstract

This paper presents a direct method to generate a transmission zero in evanescent-mode waveguide filter by adding a shorted waveguide shunted in the coupling region between two resonators. First, a traditional evanescent-mode waveguide filter with series coupling topology is designed. To introduce a transmission zero to enhance the stopband performance, a shorted waveguide is shunted in the coupling region between two adjacent resonators. Adjusting length of the shunted waveguide can easily adjust the position of the transmission zero. To maintain the bandpass performance of the whole filter, the coupling region needs to be tuned to produce suitable coupling strength as the same as the original one. A fourth-order example is designed and measured, measured results show good accordance with the simulated ones, validating the proposed method in this paper.

Keywords

Transmission zero Evanescent mode Shorted waveguide Fourth order 

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Copyright information

© Springer Nature Singapore Pte Ltd. 2020

Authors and Affiliations

  • Liu He
    • 1
    Email author
  • Xingjian Zhong
    • 1
  • Zhendong Fan
    • 1
  • Quan Zhang
    • 1
  • Wei Zhang
    • 1
  1. 1.College of Communications EngineeringThe Army Engineering University of PLANanjingChina

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