| 摘要 |
<p>Traveling Wave Tube with Frequency Variable Sever Length In a traveling wave tube (TWT) with a non-dis-persive interaction circuit such as a helix, the length of the circuit in wavelengths, and hence the gain of the tube, varies with the frequency. The variations of gain over a very wide bandwidth can cause oscillation problems. The The invention provides an inverse variation with frequency of the physical length over which the circuit interacts with the beam. This is done by resonant attenuators coupling to the interaction circuit over various lengths depending on their resonant frequency, the attenuation being enough to effectively remove the interaction circuit wave. The attenuators are preferably formed of resonant sections of slow-wave circuit deposited on longitudinal ceramic rods such as the helix support rods.</p> |
