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.
|Title of host publication||Proceedings of 14th Conference on Microwave Techniques, COMITE 2015|
|Publisher||Institute of Electrical and Electronics Engineers|
|Publication status||Published - 9 Jun 2015|
|Event||14th Conference on Microwave Techniques, COMITE 2015 - Pardubice, Czech Republic|
Duration: 22 Apr 2015 → 23 Apr 2015
|Conference||14th Conference on Microwave Techniques, COMITE 2015|
|Period||22/04/15 → 23/04/15|
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© 2015 IEEE.