Improving the high-frequency performance of coaxial-to-microstrip transitions

Jui Ching Cheng, Eric S. Li, Wen Fu Chou*, Kuan Lin Huang

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

23 Scopus citations


This paper presents a new design to improve the transmission characteristics of coaxial-to-microstrip transitions. A metallic ring is added to a conventional coaxial structure to serve as a buffer between a coaxial line and a microstrip line. The introduction of the metallic ring reduces the insertion loss of the transition caused by the sudden changes of the electromagnetic field distributions from one transmission line to another. This improvement is more prominent at higher frequencies; hence, the 1-dB transmission passband of the transition is increased significantly. A practical design example is implemented and measured. The increase of the 1-dB passband is more than 60%. The new design is also proven to be suitable for transitions between various coaxial cables/connectors and microstrip lines on different substrates or another commonly used planar transmission line, the coplanar waveguides. The robust nature of this design makes its performance not susceptible to the fabrication and assembly errors of the transitions. These characteristics qualify the proposed design as an excellent candidate for coaxial-to-microstrip transitions at higher frequencies.

Original languageEnglish
Article number5742720
Pages (from-to)1468-1477
Number of pages10
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number6
StatePublished - 06 2011


  • 1-dB passband
  • Coaxial line
  • metallic ring
  • microstrip line
  • transition


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