Modified vertically installed planar couplers for ultrabroadband multisection quadrature hybrid

Hui Chun Chen*, Chi-Yang Chang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


In this letter, we describe a five-section ultrabroad-band 1-9 GHz microstrip quadrature hybrid (90°, - 3 dB coupler), which uses two types of modified vertically installed planar (YIP) couplers and is suitable for conventional printed circuit board realization. The modified VIP couplers provide not only a way to implement tight coupling value with reduced modal phase velocity difference but also a layout flexibility to minimize the discontinuity between sections. An experimental circuit is designed and fabricated with a passband ripple of ±0.5 dB, a return loss of less than -20 dB, and an isolation of better than 20 dB over the frequency of 1-9 GHz. Very good agreement between the simulated and measured results is obtained.

Original languageEnglish
Article number1661639
Pages (from-to)446-448
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number8
StatePublished - 1 Aug 2006


  • Modified vertically installed planar (VIP) coupler
  • Multisection hybrid
  • Quadrature hybrid
  • VIP coupled line

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