Compact microstrip harmonic-suppressed quadrature hybrids

Li Yen Wang, Kewen Hsu, Wen Hua Tu

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


In this article, compact 3-dB branch-line hybrids with harmonic suppression are presented. In comparison to the conventional hybrids, the proposed ones achieve two features: compactness and harmonic suppression. Two hybrids, one with third harmonic suppression and the other with third and fifth harmonics suppression, are designed, fabricated, and measured. T-shaped or cross-shaped equivalent lines are used to replace the quarter-wavelength microstrip lines of the conventional hybrids. The equivalent lines achieve the same fundamental characteristic and act like bandstop filters at the particular harmonics to improve suppression. Moreover, the proposed hybrid with third harmonic suppression achieves 29.5% size reduction as compared to the conventional one.

Original languageEnglish
Pages (from-to)981-985
Number of pages5
JournalMicrowave and Optical Technology Letters
Issue number4
StatePublished - Apr 2009


  • Harmonic suppression
  • Microstrip hybrid
  • Quadrature hybrid


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