Electric lamp and discharge devices: systems – Cathode ray tube circuits – Combined cathode ray tube and circuit element structure
Patent
1982-05-12
1984-10-30
Chatmon, Saxfield
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Combined cathode ray tube and circuit element structure
313293, 332 7, 315 5, 315 529, 315 537, 315 532, H01J 2500
Patent
active
044802102
ABSTRACT:
An efficient relatively high-power inductive output linear electron beam tube with broad-band capabilities is disclosed which is density modulated with a grid applying to the beam an RF modulating signal. The grid has a large active area which may be of the order of ten square inches, is closely spaced one-twentieth the grid diameter or less to a thermionic cathode, and is comprised of a plurality of curved thin narrow elongated members. With the aid of an annular anode downstream of the grid, the beam is accelerated by DC potential of at least several kilovolts. A high-isolation input signal means includes adjacent but physically and electrically isolated wide-diameter, axially reduced annular cathode and grid lead means for leading both the DC beam-accelerating potential into the cathode, and the modulating RF signal into the grid with minimal impedance. A grid support means at one end of the grid peripherally engages the grid with a resilient deformable contact member to facilitate differential expansion without grid distortion while accurately maintaining the close grid to cathode spacing. The resulting density modulation forms the beam into correspondingly high-density moving bunches of electrons. An axial drift tube means encloses the beam, extends to a collector, and is interrupted by a gap. A coaxial resonant cavity about the drift tube, and into which the gap opens allows the bunches passing closely past the gap to induce efficiently in the cavity a VHF, UHF or microwave output signal corresponding to the modulating signal, but with an output power of at least a kilowatt.
REFERENCES:
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Preist Donald H.
Shrader Merrald B.
Chatmon Saxfield
Cole Stanley Z.
Sgarbossa Peter J.
Varian Associates Inc.
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