Tunable lumped-distributed capacitively-coupled transmission-line filter

Carey-Smith B., Warr P., Beach M., NESİMOĞLU T.

ELECTRONICS LETTERS, vol.40, no.7, pp.434-436, 2004 (SCI-Expanded, Scopus) identifier identifier

  • Publication Type: Article / Article
  • Volume: 40 Issue: 7
  • Publication Date: 2004
  • Doi Number: 10.1049/el:20040291
  • Journal Name: ELECTRONICS LETTERS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.434-436
  • Middle East Technical University Northern Cyprus Campus Affiliated: No

Abstract

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.