2.4/5.2 GHz dual-band bandpass filter using open-loop square-ring and insert coupling structure

Cheng Yuan Kung, Ying Chung Chen, Cheng Fu Yang, Mau-phon Houng

Research output: Chapter in Book/Report/Conference proceedingConference contribution


A novel 2.4/5.2 GHz dual-band bandpass filter is proposed for WLAN (IEEE-802.11a/b/g) applications. The filter is cascaded by three open-loop square-ring resonators and two modified input/output transmission lines. The open-loop squarering with novel insert coupling structure is used to replace the typical hairpin structure for minimization. The filter is fabricated on the Al2O3 substrate with high quality factor by the printing method. The substrate is 0.6 mm in thickness and has a relative dielectric constant of 9.4. By combining the high dielectric constant substrate and modified structure, the proposed filter shows the advantages of low insertion loss, high out-of-band rejection, wide bandwidth and tiny size. The measured frequency responses reveal excellent agreement with the simulated ones.

Original languageEnglish
Title of host publication2007 Asia-Pacific Microwave Conference, APMC
Publication statusPublished - 2007 Dec 1
EventAsia-Pacific Microwave Conference, APMC 2007 - Bangkok, Thailand
Duration: 2007 Dec 112007 Dec 14

Publication series

NameAsia-Pacific Microwave Conference Proceedings, APMC


OtherAsia-Pacific Microwave Conference, APMC 2007

All Science Journal Classification (ASJC) codes

  • Engineering(all)


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