A non-reciprocal bandpass diplexer

Xiaohu Wu, Mahmoud Nafe, Alejandro Álvarez Melcón, Juan Sebastián Gómez-Díaz, Xiaoguang Liu

Research output: Contribution to journalArticlepeer-review


This letter presents a non-reciprocal diplexer with integrated functions of a conventional bandpass diplexer and two isolators. This is achieved by spatio-temporally modulating the resonator frequencies in a coupled-resonator diplexer. Due to the high channel-to-channel isolation, the diplexer channels can be independently modulated without affecting each other. A microstrip diplexer example is demonstrated with good agreement between the measurement and the simulation. The fabricated diplexer has two non-reciprocal bandpass channels at 829 and 997 MHz, with a minimal insertion loss of 4.9 and 6.1 dB, and a 20-dB isolation bandwidth of 38 and 37 MHz, respectively. To the best of the authors' knowledge, this is the first time that a non-reciprocal diplexer has been presented.

Original languageEnglish (US)
Article numbere22592
JournalInternational Journal of RF and Microwave Computer-Aided Engineering
Issue number6
StatePublished - Jun 2021


  • bandpass
  • diplexer
  • filter
  • microstrip
  • non-reciprocal
  • reciprocal

ASJC Scopus subject areas

  • Computer Science Applications
  • Computer Graphics and Computer-Aided Design
  • Electrical and Electronic Engineering


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