Implementation of Distributed-Element Foster Section and Its Applications to Bandpass Filters

Jongheun Lee, Juseop Lee

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


An accurate method to implement a bandpass-domain coupled-line Foster section is presented. Two types of practical coupled-line structures are presented and closed-form equations for their design parameters are given in terms of lowpass prototype parameters, reference impedance, and fractional bandwidth so that one can readily use them in various filter designs. The design process of a bandpass filter using Foster sections is described via an example.

Original languageEnglish
Pages (from-to)391-394
Number of pages4
JournalIEEE Microwave and Wireless Components Letters
Issue number5
Publication statusPublished - 2022 May 1

Bibliographical note

Funding Information:
This work was supported by the Institute for Information and Communication Technology Promotion (IITP) Grant through the Ministry of Science and ICT, South Korea, under Grant 2019-0-0008.

Publisher Copyright:
© 2001-2012 IEEE.


  • Degenerate Brune section
  • Foster section

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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