A Compact Slow-Wave Filter with Double-sided Selectivity and Wide Out-of-Band Rejection

Arash Arsanjani*, Hossein Sarbandi Farahani*, Behrooz Rezaee, Reinhard Teschl, Wolfgang Bösch

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference paperpeer-review


In this paper, a miniaturized filter with double-sided selectivity and wide out-of-band rejection is presented. The slow-wave and negative cross-coupling structures are effectively adopted to realize an ultra-compact K-band filter with two symmetric transmission zeros. Starting from a bandpass filter configured for a center frequency of 18.5 GHz and the main-line couplings that only exhibits a good out-of-band rejection of 30 dB up to 30 GHz, the two proposed negative cross-couplings enable the steep roll-off out-of-band rejections as well as low in-band insertion losses of 1.7 dB and 2.4 dB. The designed structures are utilizing both the additive manufacturing and PCB-based technology which in turn, provide a simple, low-profile, and cost-effective fabrication process for highly integrated RF systems, particularly in satellite applications.

Original languageEnglish
Title of host publication2021 IEEE Asia-Pacific Microwave Conference, APMC 2021
Number of pages3
ISBN (Electronic)9781665437820
Publication statusPublished - 28 Nov 2021
Event2021 IEEE Asia-Pacific Microwave Conference: APMC 2021 - Brisbane, Virtual, Australia
Duration: 28 Nov 20211 Dec 2021


Conference2021 IEEE Asia-Pacific Microwave Conference
Abbreviated titleAPMC 2021
CityBrisbane, Virtual


  • K-band filter
  • Negative coupling
  • Slow-wave
  • Transmission zero

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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