Design and modeling of twin-spiral coplanar-waveguide-to-slotline transitions

Yo Shen Lin, Chun Hsiung Chen

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


A novel reduced-size twin-spiral coplanar-waveguide-to-slotline transition is proposed in this paper. This twin-spiral transition is based on a modification of quarter-wavelength transformer structure. For design purpose, a hybrid equivalent-circuit model of combining transmission-line theory and full-wave simulation is established. Based on this model, various twin-spiral transition structures are carefully examined theoretically and experimentally. Specifically, a twin-spiral transition with 2.26:1 bandwidth and one-quarter the size of conventional ones is achieved. Being simple in fabrication and small in size, the proposed twin-spiral coplanar-waveguide-to-slotline transition is a useful component in uniplanar microwave integrated circuit/monolithic-microwave integrated-circuit applications.

Original languageEnglish
Pages (from-to)463-466
Number of pages4
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number3
StatePublished - 2000


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