Design flexibility of an open-loop resonator filter using similarity transformation of coupling matrix

Chang Soo Ahn, Juseop Lee, Young Sik Kim

Research output: Contribution to journalArticle

15 Citations (Scopus)


In this letter, the design flexibility of an elliptic-response open-loop resonator filter is achieved through similarity transformation of the coupling matrix. To verify the proposed method, a compact four-pole elliptic-response bandpass filter is designed using the conventional structure with open-loop resonators. Designed filter has the resonators with very narrow spacing for the required coupling coefficient and it is impossible to implement a filter with wider fractional bandwidth. Two possible configurations to overcome this problem are presented through similarity transformation of the coupling matrix. From this design flexibility, a filter with wider fractional bandwidth is designed with realizable design parameters.

Original languageEnglish
Pages (from-to)262-264
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number4
Publication statusPublished - 2005 Apr 1



  • Coupling matrix
  • Elliptic-response filter
  • Open-loop resonator
  • Similarity transformation

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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