Design of a compact dual-mode ring resonator bandpass filter with harmonic suppression

Fenq Lin Jenq, Kwok Keung Chong, Hsuan Der Yen, Chien Chih Liu

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


An approach to suppress the harmonic responses in a dual-mode circular ring resonator bandpass filter is presented. Feed lines with one-sided coupling arms are suitably relocated around the ring resonator to introduce phase interference between two degenerate modes for simultaneously suppressing the second and third harmonics. Three open loop resonators at the rim of the ring are adopted to further suppress the second harmonic. By fabricating on a FR4 glass-epoxy base, this approach is demonstrated to have effectiveness in broadening the filter's rejection band in both simulations and measurements without affecting the fundamental response or increasing the device size.

Original languageEnglish
Pages (from-to)741-744
Number of pages4
JournalJournal of the Chinese Institute of Engineers, Transactions of the Chinese Institute of Engineers,Series A/Chung-kuo Kung Ch'eng Hsuch K'an
Issue number5
Publication statusPublished - 2009

All Science Journal Classification (ASJC) codes

  • Engineering(all)


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