Tunability of commonly used coupled-line bandpass filter topologies

Elmine Botes, Petrie Meyer

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


This work presents a study on the tunability of popular coupled-line filter topologies. The study considers a Chebychev prototype and transforms it to commonly used coupled-line topologies, namely the staircase, interdigital, hairpin, and combline topologies. The filters are designed for X-band frequencies with a 10 GHz centre frequency and a 5 % bandwidth, and are modelled using ideal transmission lines in a circuit simulator. The study is focused on centre frequency tunability while maintaining a constant bandwidth and out-of-band attenuation. It is shown that the classical staircase topology offers the best balance between good centre frequency tunability and out-of-band attenuation in comparison with the hairpin, interdigital and combline filters.

Original languageEnglish
Title of host publicationProceedings of 14th Conference on Microwave Techniques, COMITE 2015
PublisherInstitute of Electrical and Electronics Engineers
ISBN (Electronic)9781479981212
Publication statusPublished - 9 Jun 2015
Externally publishedYes
Event14th Conference on Microwave Techniques, COMITE 2015 - Pardubice, Czech Republic
Duration: 22 Apr 201523 Apr 2015


Conference14th Conference on Microwave Techniques, COMITE 2015
Country/TerritoryCzech Republic

Bibliographical note

Publisher Copyright:
© 2015 IEEE.


Dive into the research topics of 'Tunability of commonly used coupled-line bandpass filter topologies'. Together they form a unique fingerprint.

Cite this