CMI Home
Select Part Type:  
  Variable Phase Shifters

These Phase Shifters are used for varying the electrical length of transmission lines. Each unit consists of a section of waveguide with a narrow slot milled in the broad wall. Through this slot, a thin rexolite vane is introduced into the waveguide by a precision micrometer. The drive mechanism is arranged to provide more than 180° of phase shift over .250 to .500 inch travel on the micrometer dial, depending on the waveguide size. Featuring no backlash, these units will produce accurate and reproducible settings. All units are uncalibrated.

CMI Offers these parts made from coin silver waveguide as a custom product. Send email to for quote.

This product is now available with a metric micrometer drive assembly.

Ordering Example: VP28S is a Variable Phase shifter in WR28 with Square flanges.

Ordering Information
To order please send email to Sales and indicate the part #s and quantities desired.
 Catalog #  Waveguide Size  Flange
 VP42R/S  WR42  Square - 0.875
 VP34R/S  WR34  Square - 0.875
 VP28R/S  WR28  Square - 0.750
 VP22R  WR22  Round - 1.125
 VP19R  WR19  Round - 1.125
 VP15R  WR15  Round - 0.750
 VP12R  WR12  Round - 0.750
 VP10R  WR10  Round - 0.750
 VP8R  WR8  Round - 0.750
 VP6R  WR6  Round - 0.750
 VP5R  WR5  Round - 0.750
 VP4R  WR4  Round - 0.750
 VP3R  WR3  Round - 0.750
 VP2.2R  WR2.2  Round - 0.750