Inline Interdigital Pseudo-Elliptic Helical Resonator Filters

Efstratios Doumanis, George Goussetis, S.A. Kosmopoulos

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


A new inline coupling topology for narrowband helical resonator filters is proposed that allows to introduce selectively located transmission zeros (TZs) in the stopband. We show that a pair of helical resonators arranged in an interdigital configuration can realize a large range of in-band coupling coefficient values and also selectively position a TZ in the stopband. The proposed technique dispenses the need for auxiliary elements, so that the size, complexity, power handling and insertion loss of the filter are not compromised. A second order prototype filter with dimensions of the order of 0.05 lambda, power handling capability up to 90 W, measured insertion loss of 0.18 dB and improved selectivity is presented.
Original languageEnglish
Article number5948392
Pages (from-to)400-402
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number8
Publication statusPublished - Aug 2011

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Inline Interdigital Pseudo-Elliptic Helical Resonator Filters'. Together they form a unique fingerprint.

Cite this