Microstrip lowpass-highpass diplexer for a quadplexer application

Minjae Jung, Byung Wook Min

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


A microstrip low-loss diplexer is designed based on a lowpass and highpass Chebyshev filter configuration and combined with two duplexers for a quadplexer application. A 50-Ω transmission line is added to the lowpass filter to have a high impedance at the highpass frequency band, resulting in low loss and high isolation. To minimize size of the diplexer, high impedance meander lines, interdigitated capacitors, and stepped impedance transmission lines are used. The proposed diplexer has the isolation higher than 41 dB with the insertion loss less than 1.6 dB at the designed frequencies. The designed quadplexer has a good transmission performances at all four frequency bands, and can be used for a dual-band frequency division multiplexing system with a dual-band/broadband antenna.

Original languageEnglish
Pages (from-to)2026-2028
Number of pages3
JournalMicrowave and Optical Technology Letters
Issue number9
Publication statusPublished - 2014 Sept

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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