Article

Flann Microwave has developed rotary vane attenuators (RVAs) since its founding in 1956, evolving from manual units to programmable models in the late 1970s and sub-millimetric versions in the 2010s. RVAs are utilized in sectors including aerospace, defense, telecommunications, and scientific research for controlled signal attenuation.

The introduction of programmable WG26 RVAs enhanced automation in testing, while the WM570 sub-millimetric RVA allowed for higher frequency attenuation in compact waveguides. RVAs are integral to radar systems, microwave networks, and laboratory setups, enabling precise signal strength adjustments.

The devices operate by rotating a resistive vane within a circular waveguide, maintaining polarization and suppressing unwanted modes. Their consistent performance and predictable attenuation response underpin their continued use in both research and operational systems.