Balanced and balun diplexers designed using center-grounded uniform-impedance resonators

Ching Her Lee, Chung I.G. Hsu, Pi Hung Wen

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


A balanced diplexer and a balun diplexer, both with high isolation, are proposed in this article. First, a balanced bandpass filter (BPF) operating in GSM (with a center frequency of 1.92 GHz) and the other in WLAN (with a center frequency of 2.45 GHz) were designed using ordinary uniform-impedance resonators (UIRs) and center-grounded UIRs. Next, the two balanced BPFs were combined through two T-junctions to form a six-port balanced diplexer. Finally, a five-port balun diplexer was obtained by removing from the balanced diplexer one of the two T-junctions along with the microstrip feeding lines connected to it and by carefully adjusting the structural dimensions of the other T-junction. A satisfactory agreement is validated between simulated and measured results.

Original languageEnglish
Pages (from-to)555-559
Number of pages5
JournalMicrowave and Optical Technology Letters
Issue number3
Publication statusPublished - 2014 Mar 1

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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