Wide-band microstrip-to-coplanar stripline/slotline transitions

Wen Hua Tu, Kai Chang

Research output: Contribution to journalArticlepeer-review

91 Scopus citations


Wide-band microstrip line to coplanar stripline (CFS) transitions are proposed. The transition consists of a multisection matching transformer and a quarter-wavelength radial stub for the impedance matching and field matching between the microstrip line and CPS, respectively. The proposed planar transition has the advantages of compact size, wide bandwidth, and straightforward design procedure. Several parameters are studied through simulations and experiments to derive some design guidelines. With the return loss of better than 14 dB, the 1-and 3-dB back-to-back insertion loss bandwidth can cover from 1.4 to 6.6 GHz (1:4.7) and from 1.1 to 10.5 GHz (1:9.6), respectively. In addition, the microstrip-to-CPS transition is extended to design a microstrip-to-slotline transition by tapering the CPS into a slotline. From 2.7 to 10.4 GHz (1:3.85), the back-to-back return loss is better than 15 dB and the insertion loss is less than 3 dB.

Original languageEnglish
Pages (from-to)1084-1088
Number of pages5
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number3
StatePublished - Mar 2006


  • Balun
  • Coplanar stripline (CPS)
  • Slotline
  • Transition


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