Interim rept. Jul-Dec 74,
HUGHES AIRCRAFT CO TORRANCE CALIF ELECTRON DYNAMICS DIV
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Possible methods for reducing capture effects and intermodulation distortion in broadband traveling-wave tubes were investigated theoretically. Considered were techniques internal to the TWT, that involve interaction of electron beam and slow wave circuit. In particular, simultaneous interaction in both the fundamental and the harmonic frequency range was studied for possible reduction of intermodulation distortion. Several schemes of harmonic interaction were investigated these included harmonic fast space charge wave interaction with harmonic loss, harmonic slow space charge wave interaction with and without harmonic loss, harmonic phase tapering and harmonic drive. Of these, the last method, using simultaneous harmonic signal injection, was found to be the most promising for significantly reducing intermodulation distortion while maintaining high levels of efficiency.
- Electrical and Electronic Equipment