variable waveguide attenuator

variable waveguide attenuator

[′ver·ē·ə·bəl ′wāv‚gīd ə‚ten·yə‚wād·ər] (electromagnetism) Device designed to introduce attenuation into a waveguide circuit by moving a lossy vane either sideways across the waveguide or into the waveguide through a longitudinal slot.