W-Band Endfire 2-D Phased-Array Transmitter Based on ×9 CMOS Active Multiplier Chips

Roman Klimovich*, Samuel Jameson, Eran Socher

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


In this article, we propose a scalable approach for a W -band 2-D beam steering transmitter based on CMOS active frequency multiplier chips. Stacking of PCBs containing linear-phased arrays with endfire antennas is used with X -band power splitting and phase control. The antenna design is discussed, explaining the choice of the SIW fed antipodal linearly tapered slot antenna (ALTSA). The concept is demonstrated in the 90-100 GHz bandwidth with 1× 2 , 1× 4 , and 2× 2 arrays, achieving up to 29.4 dBm EIRP and ±10° of beam steering. Measurement results show excellent agreement with simulations, demonstrating the possibility of scalable 2-D phased arrays in W -band with low-cost small silicon area consumption.

Original languageEnglish
Article number9115825
Pages (from-to)7893-7904
Number of pages12
JournalIEEE Transactions on Antennas and Propagation
Issue number12
StatePublished - Dec 2020


  • Antipodal linearly tapered slot antenna (ALTSA)
  • CMOS
  • CPW
  • THz
  • W-band
  • Wilkinson power divider
  • X-band
  • antenna
  • frequency multiplier
  • mm wave
  • phased-array
  • power amplifier
  • sub-mm wave
  • substrate integrated waveguide (SIW)


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