The variable attenuator is used to adjust power, reduce reflection interaction, and provide isolation for certain components where needed. These attenuators contain a section of waveguide with a narrow slot milled in the broad wall. Through this slot, a thin metalized mylar vane is introduced into the waveguide by a precision micrometer. The driver mechanism is arranged to provide 0-30 dB of attenuation over .300 inch travel on the micrometer dial. Featuring no backlash, these units will produce accurate and reproducible settings.

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

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

Ordering Example: VA28S is a Variable Attenuator in WR28 with Square Flanges.