Quadruple-mode coupled-ring resonator bandpass Q filter with quasi-elliptic function passband

U. Hou Lok*, Yi Chyun Chiou, Jen Tsai Kuo

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

20 Scopus citations


Quadruple-mode coupled-ring resonator is used to design quasi-elliptic function bandpass filters (BPFs) with a relatively wide bandwidth. The resonator consists of a pair of coupled rings with two open stubs symmetrically tapped to the inner ring. The stubs are used to move a transmission zero near the center frequency to lower transition band. It is believed that it is the first ring resonator BPF based on the coupled-ring to create four transmission poles and four transmission zeros. Two filters with relative bandwidths of 10% and 15% are fabricated and measured. Good agreement between simulation and measurement is obtained.

Original languageEnglish
Article number4459065
Pages (from-to)179-181
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number3
StatePublished - 03 2008
Externally publishedYes


  • Bandpass filter (BPF)
  • Multimode resonator
  • Planar circuit
  • Quasi-elliptic function response
  • Ring resonator


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