Ultra-broad-band doubly balanced star mixers using planar Mouw's hybrid junction

Chi-Yang Chang*, Ching Wen Tang, Dow Chih Niu

*Corresponding author for this work

Research output: Contribution to journalArticle

11 Scopus citations


Ultra-broad-band star mixers using planar Mouw's hybrid junction are presented in this paper. The planar Mouw's hybrid junction is realized by coplanar waveguide (CPW) to coplanar strip (CPS) or CPW to CPW T-junctions. A new explanation of Mouw's theory based on coupled transmission lines and including the transmission line losses is presented. The modified theory is more suitable for ultra-broad-band mixer design. Some prototype mixers with CPW to CPS or CPW to CPW T-junctions are fabricated with Al 2O 3 substrate. The prototype mixers show a bandwidth of greater than 20 : 1 if the even-mode resonance has been damped out. Method for damping out the even-mode resonance is also presented. All of the prototype circuits show much broader bandwidth than that of conventional star mixer.

Original languageEnglish
Pages (from-to)1077-1085
Number of pages9
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number6 I
StatePublished - 1 Jun 2001


  • Doubly balanced mixer
  • Hybrid junction
  • Star mixer
  • Ultra-broad-band mixer

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