Integrated waveguide filter amplifier using the coupling matrix technique

Research output: Contribution to journalArticlepeer-review

External organisations

  • School of Information Engineering
  • Zhengzhou University
  • National Physical Laboratory
  • Dep. Electronic


This letter presents an integrated waveguide filter amplifier using all resonator-based filtering and matching structure. An N,+,4 active coupling matrix is proposed for the first time to describe the coupling topology. High- Q waveguide resonators are featured in the design, achieving simultaneous filtering and matching at both the input and output ports. Easy integration of the transistor with waveguide resonators is demonstrated through filter synthesis, where a hybrid waveguide/ microstrip structure is implemented for the structural and impedance transition. In this letter, an X-band device is constructed as a demonstrator, but the technique is also applicable to higher frequencies where waveguide is widely utilized for its low loss.


Original languageEnglish
Article number8667432
Pages (from-to)267-269
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number4
Publication statusPublished - 14 Mar 2019


  • Active coupling matrix, resonator, transistor, waveguide filter amplifier