Quality factor of E-plane periodically loaded waveguide resonators and filter applications

G. Goussetis, Raul Lopez Villarroya, E. Doumanis, O S Arowolo, J-S. Hong

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


The quality factor of microwave resonators miniaturised by virtue of periodic loading is assessed. Five X-band resonators in E-plane technology with different miniaturisation factors have been designed to resonate at approximately the same frequency. The loaded quality factor is extracted from the fractional bandwidth and subsequently employed to estimate the unloaded quality factor. The study reveals that the unloaded quality factor drops approximately linearly with the miniaturisation. Subsequently design guidelines for E-plane filters with periodically loaded resonators are provided by means of an example involving a fifth-order filter. Full-wave simulated and experimental results are presented to validate the study.

Original languageEnglish
Pages (from-to)818-822
Number of pages5
JournalIET Microwaves, Antennas and Propagation
Issue number7
Publication statusPublished - 13 May 2011


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