PURPOSE: To provide a slow-wave circuit structure for a progressive wave tube and its manufacture with excellent reproductivity and assembly by restraining charge to the surface of an dielectric supporting rod even in long- time operation.
CONSTITUTION: The slow-wave circuit structure for a progressive wave tube, is such a one in which dielectric supporting rod 12 to support a slow-wave line 13, having an element different from base material injected at a preset concentration from the surface of the base material for the supporting rod into a preset depth, has smaller electric resistance on the surface than electric resistance of base material itself. Its manufacture involves ion-implanting the element at a preset amount from the surface of the dielectric supporting rod to a preset depth and then giving heat treatment thereto in a nonoxidizing atmosphere.
HIRATA HITOSHI
FUJITA KATSUTOSHI
Next Patent: POWER SUPPLY DEVICE FOR PROGRESSIVE WAVE TUBE