Dual-mode dual-band bandpass filter using balun structure for single substrate configuration

Jung Woo Baik, Lei Zhu, Young Sik Kim

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)


A novel dual-mode dual-band bandpass filter (BPF) for a single substrate configuration is proposed that uses a balun structure. The outer and inner loop resonators are simultaneously excited by the microstrip line and slotline balun structure. In spite of the microstrip feed network, the proposed dual-mode BPF can achieve dual-band operation. Two proper degenerate modes in the lower and upper passbands can be generated and controlled by installing an inductive cut and a capacitive patch in the corner of two loops, respectively. This letter deals with the analysis and design of the proposed dual-band BPF as well as the experimental validation of the predicted dual-band performance.

Original languageEnglish
Article number5557751
Pages (from-to)613-615
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number11
Publication statusPublished - 2010 Nov

Bibliographical note

Funding Information:
Manuscript received March 12, 2010; revised May 31, 2010; accepted July 12, 2010. Date of publication August 26, 2010; date of current version November 05, 2010. This work was supported by the National Research Foundation of Korea Grant funded by the Korean Government [NRF-2009-352-D00224].


  • Balun structure
  • bandpass filter (BPF)
  • dual-band filter
  • dual-mode filter
  • single substrate configuration

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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