Lossless traveling wave booster tube
AssigneeVarian Associates, Inc.
InventorBertram G. James
Life of this patent
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Abstract
A traveling-wave amplifier tube adapted for use as a booster of transmitted signals has very small internal circuit attenuation so that it may be used without an electron beam as a transparent, passive path for low transmitter power. When the booster tube's beam is excited, the signal is amplified about 10dB. Upper bandedge instabilities in the lossless tube are inhibited by a lower cutoff frequency of the circuit near the output end than near the input end, so that bandedge power can flow both ways out of the large-signal output end.
Claims6
In a traveling-wave amplifier tube, a coupled-cavity slow-wave circuit adapted to interact with a stream of electrons over an extended path, output transmission line means coupled to an output end of said circuit at the downstream end of said path, means for coupling electromagnetic energy to an input end of said circuit at the upstream end of said path, the improvement wherein:
- a plurality of cavities forming a first portion of said circuit nearer said output end have outer walls with larger dimensions transverse to said beam path than those of a plurality of cavities forming a second, adjacent portion nearer said input end, whereby the upper cutoff frequency of said first portion is lower than that of said second portion.
Dependencies are inferred from the claim text.