Impedance matching travelling-wave tube coupled cavity slow-wave structures

摘要

To reduce ripples of power and gain over the bandwidth of the tube, the input and/or output cavity is rendered tunable, by change of cavity dimension, during operation of the tube. A plunger may be adjustable within the cavity via a bellows portion of the cavity wall (Fig. 2). In a cloverleaf type structure the tip 15 of one or more of the noses in the cavity may be deformable, and preferably provided with a stub 17 carrying a capacitive plate 18 thereon extending towards the axis of the tube. IMAGE