Compact bandwidth tunable if filters for reconfigurable converters

Jia Ni, Jiasheng Hong, Petronilo Martin Iglesias

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This paper aims to present some outcomes from a European Space Agency (ESA) Technology Research Programme (TRP) project on R&D of new design techniques, concepts, and filtering configurations for tunable IF (intermediate frequency) filters with a compact footprint, wide bandwidth tuning range (covering from 49 to 478 MHz at f0 = 1 GHz) as well as equivalent high-Q performance (i.e. low insertion loss variation and high selectivity by using low-Q resonators). In order to obtain a wide tuning range, the proposed filtering configuration utilizes a new tuning technique that only necessitates control of coupling values with simple DC control circuits, without the need of tuning the electrical length of resonators to avoid deviating the center frequency. Furthermore, in order to achieve the equivalent high-Q performance, a novel lossy technique by using a centrally resistor-loaded half-wavelength resonator is adopted. For the proof of concept, a six-pole prototype filter is designed, fabricated, and tested.

Original languageEnglish
Pages (from-to)1-12
Number of pages12
JournalInternational Journal of Microwave and Wireless Technologies
Early online date6 May 2021
Publication statusE-pub ahead of print - 6 May 2021


  • Microwave filters
  • planar filters
  • reconfigurable filters
  • tunable filters

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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