A parallel doubly coupled dual-band bandpass filter

Chen Mao Rao, Tzu Jung Wong, Min Hua Ho

Research output: Contribution to journalConference articlepeer-review

15 Citations (Scopus)


A parallel doubly coupled stepped impedance resonators (SIRs) structure is proposed in this paper to build a 2.4/5.2 GHz dual-band bandpass filter for a WLAN application. The prototype filter is a three-stage design composed by four SIRs in conjunction with the tapped-line used in the I/O ports to create zeros by the passband skirts. The proposed filter has the advantages of a much wider fractional bandwidth in both the passbands without sacrificing the passband's insertion losses. The conventional parallel-coupled microstrip line model is applicable in the proposed filter design. The filter has obtained almost twice wider bandwidth compared to that possessed by the counterpart filter of a conventional parallel-coupled line configuration. It is convinced that this filter design can be apply to the 2.4/5-GHz dual-band operation that needs a wider second passband. The experiment is conducted for filter performance validation. A very good agreement is observed between the simulation and the measurements.

Original languageEnglish
Article number4014947
Pages (from-to)511-514
Number of pages4
JournalIEEE MTT-S International Microwave Symposium Digest
Publication statusPublished - 2006 Dec 1
Event2006 IEEE MTT-S International Microwave Symposium Digest - San Francisco, CA, United States
Duration: 2006 Jun 112006 Jun 16

All Science Journal Classification (ASJC) codes

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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