Theoretical Design Study of a 2-18 GHz Bandwidth Helix TWT (Traveling Wave Tube) Amplifier
Final rept. Sep 1982-Oct 1986
UTAH UNIV SALT LAKE CITY DEPT OF ELECTRICAL ENGINEERING
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This report investigates the concept of applying an extremely dispersive helix section prior to a nondispersive helix section in a traveling wave tube TWT output circuit in order to realize a 2-18 GHz frequency bandwidth. The nondispersive helix circuit provides the synchronism for multioctave performance, and the dispersive helix circuit yields the second harmonic relative phase shift necessary for harmonic suppression at the low frequency band edge. Fundamental efficiency enhancement and harmonic power content are shown to be a function of the circuit phase velocity characteristics, the injection velocity parameter, and circuit length. Also described is the effect of the Crestatron interaction phenomena on the TWTs performance. All the results are based on one-dimensional large signal computer calculations.
- Electrical and Electronic Equipment