Miniaturized and large-division-ratio ring coupler using novel transmission-line elements

Kuan Lin Ho, Pei-Ling Chi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


In this letter, a novel transmission-line element that is able to exhibit a high-impedance passband is proposed and applied for coupler realization with a large power division ratio. The analysis of the transmission-line element was conducted by its equivalent circuit model and the closed-form equations for the pole and zero frequencies of the effective impedance were derived to help control the passband impedance and phase responses by the lumped parameters. The high-impedance feature of the presented artificial line was exploited to experimentally develop a 12 dB ring coupler, which occupies only 29% footprint of the conventional coupler at 3.5 GHz. Experimental results are in good agreement with the simulation data.

Original languageEnglish
Article number6661452
Pages (from-to)35-37
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number1
StatePublished - 1 Jan 2014


  • High-impedance lines
  • large division ratios
  • miniaturization
  • ring couplers

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