5G Millimeter-Wave Substrate-Integrated Waveguide Quad-Channel Diplexer with High In-Band and Wideband Isolation

Pei Ling Chi, Hung Tse Shih, Tao Yang

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

A substrate-integrated waveguide (SIW) based quad-channel diplexer operating in 28-GHz and 39-GHz bands is proposed for the first time. To allow a greater degree of design flexibility, the quad-channel diplexer was developed with T-junction scheme and the power-current waveguide impedance was used for junction arm designs to fulfill the matching/open conditions required at self-/other channel frequencies. Moreover, a near-passband transmission zero is introduced by proper coupling control between higher/lower-order modes to improve in-band isolation. The fabricated prototype shows that, for the given (narrow) bandwidths of 4.3%, 1.7%, 2.4%, and 1.7%, the measured insertion/return losses are 3.5/15.3 dB at 26.7 GHz, 4.4/20.6 dB at 28.39 GHz, 5.5/28.4 dB at 37.31 GHz, and 6.5/20.1 dB at 38.44 GHz, respectively. The measured in-band isolation is greater than 35.7 dB, 47.8 dB, 34.7 dB, and 40 dB, while wideband isolation is greater than 32 dB over 20-45 GHz.

Original languageEnglish
Pages (from-to)650 - 653
Number of pages4
JournalIEEE Microwave and Wireless Components Letters
Volume31
Issue number6
DOIs
StatePublished - Jun 2021

Keywords

  • 5G
  • 5G mobile communication
  • Couplings
  • diplexer
  • Filtering theory
  • isolation
  • Microwave filters
  • millimeter-wave
  • Passband
  • quad-channel
  • substrate-integrated waveguide
  • Substrates
  • T-junction
  • transmission zero
  • Wireless communication

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