Amplifiers – With traveling wave-type tube
Patent
1969-12-16
1976-07-27
Birmiel, Howard A.
Amplifiers
With traveling wave-type tube
315 35, 315 393, H01J 2534
Patent
active
039720055
ABSTRACT:
An ultra wide band traveling wave tube amplifier is disclosed. The amplifier employs a helix derived slow wave circuit arranged for electromagnetic interaction with a beam of electrons passable axially through the helix circuit. Signals to be amplified within the passband of the circuit interact with the electron stream to produce an amplified output signal which is extracted from the helix and coupled to a suitable utilization device. The bandwidth of the traveling wave tube amplifier is substantially increased by the provision of a conductive circuit loading structure disposed surrounding the helix circuit and extending for at least half of its length and preferably for substantially its entire length. The conductive circuit loading structure includes a plurality of conductors disposed surrounding the helix and arranged to conduct current associated with the radio frequency fields surrounding the helix substantially only in the radial or axial direction of the helix and not in the circumferential direction of the helix. Such a conductive loading structure causes the slow wave circuit to have a circuit wave velocity which increases with frequency over the passband of the circuit. This permits the slow beam space charge wave of the electron stream to remain in synchronism with the circuit wave over a wider band of frequencies and to provide a substantially constant Pierce synchronism parameter b over an ultra wide band of frequencies as of two octaves. In a preferred embodiment, the conductive loading structure is formed by a plurality of open sided channel members extending longitudinally of the helix and positioned with the open sides of the channels facing the helix to provide a plurality of conductive vane-shaped members.
REFERENCES:
patent: 2681427 (1954-06-01), Brown
patent: 3387168 (1968-06-01), Beaver
patent: 3397339 (1968-08-01), Beaver et al.
patent: 3506872 (1970-04-01), Bittorf et al.
Nevins, Jr. John E.
Winslow Lester M.
Birmiel Howard A.
Cole Stanley Z.
Nelson Richard B.
Stoddard Robert K.
Varian Associates
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