Patent ID: 6133786
Filing Date: 2000-10-17
Classification: H01J

Abstract:
In a linear beam amplification device having an axially centered electron emitting cathode and an anode spaced therefrom, said cathode providing an electron beam in response to a high voltage potential applied between said cathode and said anode, a control grid spaced between cathode and anode for modulating the electron beam in response to an applied input signal, a signal input assembly comprises:an input cavity including means for inductively coupling said input signal into said input cavity, said grid being coupled to said input cavity;a moveable tuning plunger disposed within said input cavity, said inductive coupling means being coupled to said tuning plunger allowing cooperative movement therewith; anda grid-anode cavity adjacent with said input cavity and in communication with an interaction region defined between said grid and said anode, said grid-anode cavity presenting a low impedance to said interaction region, said grid-anode cavity having walls comprised of a material having a high surface resistivity to attenuate RF resonances originating from said interaction region without RF absorbing material being affixed to said walls.