Tunable bandpass filter design based on external quality factor tuning and multiple mode resonators for wideband applications

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

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Author(s)

  • Jin-Rong Mao
  • Wai-Wa Choi
  • Kam-Weng Tam
  • Wen Quan Che
  • Quan Xue

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number6525427
Pages (from-to)2574-2584
Journal / PublicationIEEE Transactions on Microwave Theory and Techniques
Volume61
Issue number7
Publication statusPublished - Jul 2013

Abstract

In this paper, a tunable bandpass filter using crossshaped multiple mode resonators (MMRs) and transformer based external quality factor tuning structures is proposed. The use of a cross-shaped MMR simplifies inter-resonators control while two tuning structures are investigated and incorporated with theMMR to implement simultaneous center frequency agility and narrow and wide bandwidth tuning. Compared with traditional tunable filters, the proposed architecture requires less tuning elements and is easier to realize wideband and high-order tunable filters. Two examples (Filter I and II) are presented to validate the design. Both filters use a single MMR and six tuning elements to achieve a third-order wideband tunable filter. Filter I reports 58% center frequency tuning with constant bandwidth and 14%-64.4% fractional bandwidth (FBW) tuning when center frequency locates at 1 GHz. Filter II achieves larger frequency agility and wider FBW tuning of 82.9% and 95%, respectively, for the same bandwidth and center frequency of Filter I. © 2013 IEEE.

Research Area(s)

  • External quality factor, J/K inverter, Multiple mode resonator (MMR), Tunable filter

Citation Format(s)

Tunable bandpass filter design based on external quality factor tuning and multiple mode resonators for wideband applications. / Mao, Jin-Rong; Choi, Wai-Wa; Tam, Kam-Weng; Che, Wen Quan; Xue, Quan.

In: IEEE Transactions on Microwave Theory and Techniques, Vol. 61, No. 7, 6525427, 07.2013, p. 2574-2584.

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