Norman R. Vanderplaats - Alexandria VA Henry D. Arnett - Washington DC
Assignee:
The United States of America as represented by the Secretary of the Navy - Washington DC
International Classification:
H01J 2534
US Classification:
315 35
Abstract:
Backward-wave oscillations in a helix or helix-derived traveling-wave tube re prevented by dimensioning the conductive shell surrounding the helix so that the backward-wave space harmonic of the slow-wave interaction circuit has a cutoff frequency in the vicinity of the frequency of the potential backward-wave oscillations. Lossy material is disposed between the shell and helix so that there is strong coupling between the electromagnetic field and the lossy material near the cutoff frequency of the backward-wave space harmonic.
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