Patent ID: 7688132
Filing Date: 2010-03-30
Classification: H01J,H03F

Abstract:
1. A linear beam amplification device comprising: an electron-emitting cathode and an anode spaced therefrom, and a grid disposed between the cathode and the anode such that a grid-to-cathode interaction region is defined between the grid and the cathode, the cathode providing an electron beam in response to a high voltage applied between the cathode and the anode, the electron beam being density modulated by a radio frequency signal applied to the grid, and an input circuit operatively coupled to the grid-to-cathode interaction region comprising: the center conductor of the coaxial transmission line connects to the grid; and the outer conductor of the coaxial transmission line directly connects to the cathode and is terminated in at least one of: (a) a resistive termination device; and (b) a matched load provided by the electron beam such that power in the radio frequency signal travelling in the coaxial transmission line is deposited in a resistive component of a beam impedance associated with the electron beam.