Components & Accessories

Z-Roll Unit

Z-Roll units provide linear and rotary movement to a probe antenna, typically as part of a planar scanner measurement system.

The Z-Roll is a dual-axes positioning unit allowing for fine adjustments of the AUT probe distance via the Z-axis and the alignment of the polarization of the AUT probe via the roll axis. Z-axis positioning facilitates planarity correction during antenna measurement. Z-on-the-Fly application software pilots the unit.

The Z-axis of the Z-Roll unit can be used to remove multiple reflections between the probe and the AUT by measuring several near field data planes at lamda/2 distances between the two.


  • AL-610-1
Z-Roll Unit


  • High repeatability
  • Travel lengths from 0.1 m - 3 m
  • Manual and motorized models
  • Low backlash
  • High accuracy positioning
  • Roll positioners AL-161; AL-360
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