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Tunable lumped-distributed capacitively-coupled transmission-line filter

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)434 - 436
JournalElectronics Letters
Journal issue7
StatePublished - Apr 2004


A wide tuning range filter is proposed based on lumped-distributed capacitively-coupled transmission lines. The proposed structure maintains a constant inter-resonator coupling factor over a wide centre-frequency tuning range leading to a constant fractional bandwidth design. A bandpass filter with a two-octave tuning range has been designed, fabricated and measured

Additional information

Publisher: Institution of Electrical Engineers (IEE) Rose publication type: Journal article Sponsorship: This work has been performed in the framework of the IST project IST-2001–34091 SCOUT, which is partly funded by the European Union. The authors would like to acknowledge the contributions of their colleagues

Research areas

  • band-pass filters, coupled circuits, coupled transmission lines, resonator filters




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