Ka-band vector reflectometer based on simple phase-shifter design

Mohamed A. Abou-Khousa, Mark A. Baumgartner, Sergey Kharkovsky, Reza Zoughi

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


An automated handheld simple vector reflectometer design for complex-reflection-coefficient measurements at 35.5 GHz (Ka-band, 26.540 GHz) is presented. The proposed reflectometer is based on a standing-wave voltage measuring device and an electronically controlled and custom-designed millimeter-wave phase shifter. The phase shifter consists of p-i-n diode-loaded subresonant slots cut into the wall of a Ka-band waveguide. This paper describes the design of the phase shifter and the overall reflectometer. A comparison of the measurement results, for several loads, using this reflectometer and an Agilent E8364B performance network analyzer is also presented showing the measurement accuracy of the proposed reflectometer. Finally, the utility of this reflectometer for imaging complex composite structures, incorporating a high-resolution synthetic aperture imaging technique, is also demonstrated.

Original languageBritish English
Article number5611607
Pages (from-to)618-624
Number of pages7
JournalIEEE Transactions on Instrumentation and Measurement
Issue number2
StatePublished - Feb 2011


  • Complex reflection coefficient
  • millimeter wave
  • p-i-n diodes
  • phase shifter
  • reflectometer
  • subresonant slots
  • waveguide


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