Passive mm-wave imaging using two scanning fan-beam antennas

Yue Li*, Greg Timms, John Archer, Grahame Rosolen, Juan Tello, Michael Brothers, Andrew Hellicar, Y. Jay Guo

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

2 Citations (Scopus)


A prototype cross-correlating 190 GHz passive mm-wave imaging system has been developed. This system is based on the Mills Cross system used for radio astronomical imaging. It uses two pillbox antennas arranged in a T configuration. Each antenna generates a fan beam and the two fan beams are orthogonal to each other. By cross-correlating signals received from the two antennas, an output is obtained which is proportional to the millimeter-wave intensity radiated from the target at the intersection of the two fan beams. Beam scanning is generated by rotating a small sub-reflector inside each antenna. As a result, these relatively heavy antennas are stable during scanning and a high frame rate can be achieved. Another advantage of this approach is that only two receivers are required. The baseline (the displacement between phase centers of the two antennas) of this system is not zero, because the phase centers of the two antennas are not located at the same position. The baseline generates a fringe in the imaging system and its influence on the performance of the system is analyzed in this paper. The scanning speed of this system is also much faster than that of the Mills Cross imaging system and its influence on the resolution is also analyzed. It is found that the effect of the scanning speed is minimized when the beam scans along the equal-phase line of the fringe. This system can also be used as an active imaging system and this is discussed in another paper.

Original languageEnglish
Title of host publicationPassive Millimeter-Wave Imaging Technology X
Place of PublicationWashington, DC
Number of pages9
ISBN (Print)0819466700, 9780819466709
Publication statusPublished - 2007
Externally publishedYes
EventPassive Millimeter-Wave Imaging Technology X - Orlando, FL, United States
Duration: 11 Apr 200711 Apr 2007


OtherPassive Millimeter-Wave Imaging Technology X
Country/TerritoryUnited States
CityOrlando, FL


  • Fringe
  • Millimeter-wave
  • Passive imaging
  • Scanning speed


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