Novel centrally loaded resonators and their applications to bandpass filters

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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  • Xiu Yin Zhang
  • Quan Xue

Related Research Unit(s)


Original languageEnglish
Article number4472277
Pages (from-to)913-921
Journal / PublicationIEEE Transactions on Microwave Theory and Techniques
Issue number4
Publication statusPublished - Apr 2008


This paper presents several novel centrally loaded resonators and their applications to various types of bandpass filters. Based on the theoretical analysis, it is found that the even-mode resonance of the proposed resonators can be conveniently controlled without affecting the responses at the odd-mode resonant frequencies. Benefiting from this feature, the resonator can be utilized to design not only harmonic-suppressed bandpass filters and dual-band bandpass filters but also tunable bandpass filters. The tunable filter offers a fixed passband and a tunable one. The center frequency of the upper passband can be electrically tuned, whereas the performance of the lower one is maintained constant. To demonstrate these applications, four filters using the proposed resonators are implemented. The experiments verify the theoretical predictions and simulations. © 2006 IEEE.

Research Area(s)

  • Bandpass filters, Centrally loaded resonators, Dual-band filters, Harmonic suppression, Tunable filters