Wideband mm-Wave CMOS Slow Wave Coupler

Dristy Parveg, Mikko Varonen, Denizhan Karaca, Kari Halonen

Research output: Contribution to journalArticleScientificpeer-review

17 Citations (Scopus)
205 Downloads (Pure)


In this letter, we have presented a design of on-chip millimeter-wave 3-dB quadrature coupler that utilizes the coupled slow wave coplanar waveguide. The designed CMOS coupler covers the whole E- and W-band and occupies a silicon area of only 0.0115 mm 2 , which is significantly smaller compared to the conventional microstrip-line-based Lange couplers. Measurement of the quadrature coupler shows a -3.5 dB through and a -4.4-dB coupling at 90 GHz. A less than ±1-dB amplitude and a ±4° phase errors from 55 to 110 GHz are recorded.

Original languageEnglish
Article number8627920
Pages (from-to)210-212
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number3
Publication statusPublished - 28 Jan 2019
MoE publication typeNot Eligible


  • 3 dB
  • CMOS
  • coupled line
  • coupled slow wave coplanar waveguide (CS-CPW)
  • coupler
  • E-band
  • Lange coupler
  • millimeter-wave (mm-wave)
  • quadrature
  • SiGe
  • slow wave
  • W-band


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