Patent ID: 9196448
Filing Date: 2015-11-24
Classification: H01J

Abstract:
1. An electron tube including a helix used as a circuit that makes an electron beam and an RF (radio frequency) signal interact with each other, said electron tube comprising: a shell that encloses said helix inside; and a plurality of support rods that support and fix said helix inside said shell, a part of each support rod that is in contact with an inner wall of said shell being covered with a conductive material, another part of each support rod that is in contact with said helix being covered with a dielectric material, wherein the widths of said conductive material of one end and another end of each support rod in a longitudinal direction, on a side surface of said support rod, are different, the side surface not being in contact with said shell nor said helix, wherein each of said support rods is arranged so that: