Traveling wave tube having tapered longitudinally directed loadi

Details Traveling wave tube having tapered longitudinally directed loadi Traveling wave tube having tapered longitudinally directed loadi

1969-12-16

1976-02-24

Farley, Richard A.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Combined cathode ray tube and circuit element structure

315 36, 315 393, H01J 2534

Patent

active

039406547

ABSTRACT:
A traveling wave tube amplifier is disclosed. The amplifier employs a helix derived slow wave circuit arranged for electromagnetic interaction with a stream of electrons for amplifying wave energy applied to the slow wave circuit. A plurality of loading conductors are disposed about the outside surface of the slow wave circuit and extending lengthwise thereof. The conductors are arranged such that the spacing from the conductors to the slow wave circuit decreases toward its downstream end. The conductors are arranged such that they conduct radio frequency currents longitudinally of the slow wave circuit and do not appreciably conduct r.f. current in the direction circumferentially about the axis r.f. power flow on the slow wave circuit. Such loading conductors serve to decrease the phase velocity for wave energy on the circuit over the passband of the circuit. As a result, the interaction efficiency is substantially improved over the passband of the traveling wave tube amplifier. The loading conductors, in a preferred embodiment, are formed by a plurality of conductive channel shaped members with the open side of the channels being disposed facing the slow wave circuit. The channel is tapered in depth such that the conductive vane-shaped side wall members of the channel progressively extend closer to the slow wave circuit taken in the direction toward the downstream end of the circuit.

REFERENCES:
patent: 2825841 (1958-03-01), Convert
patent: 2933637 (1960-04-01), Bruck et al.
patent: 3020439 (1962-02-01), Eichenbaum
patent: 3250946 (1966-05-01), Dechering et al.
patent: 3397339 (1968-08-01), Beaver et al.

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