Balanced bandpass filters using center-loaded half-wavelength resonators

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

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  • Jin Shi
  • Quan Xue


Original languageEnglish
Article number5439928
Pages (from-to)970-977
Journal / PublicationIEEE Transactions on Microwave Theory and Techniques
Issue number4
Publication statusPublished - Apr 2010


This paper presents a balanced filter that is designed by using the center-loaded half-wavelength resonator. To demonstrate the design ideas, the differential- and common-mode equivalent half circuits are built and studied. The proposed technique is novel in the way that the common-mode suppression can be made independent of the differential-mode response in the balanced filter, making use of a center-loaded half-wavelength resonator. This is very important to simplify the design and tuning processes of the balanced filters. Making use of this feature, the resonator is not only utilized to design the balanced single-band bandpass filter but also the balanced dual-band bandpass one, possibly being the first to be presented. To demonstrate the design ideas, one single-band and two dual-band balanced filters are presented. The experimental results agree well with the theoretical predictions and simulations. © 2006 IEEE.

Research Area(s)

  • Balanced filter, Center-loaded half-wavelength resonator, Common-mode suppression, Dual band, Independent tuning, Single band