Research Of Depressed Collector For Ku-band TWT

Traveling wave tube (TWT)，a core device of microwave amplifier with widefrequency band, high-power and so on, had been widely used in communication system ofweapon. The next generation microwave amplifier, in which the size, weight, energyconsumption is reduced for battlefield survivability, demands TWT with smaller size,lighter weight and higher efficiency.TWT efficiency was very low，because little kinetic energy of the electronsaccelerated by electric field acceleration was exchanged to high-frequency field, andmuch kinetic energy was wasted. Depressed collector that could recover part kineticenergy of the electrons after the electrons and high-frequency field interacting shouldimprove the efficiency of TWT. The multi-stage depressed (MDC) to further improve theefficiency of TWT was an effective way to achieve high efficiency miniaturization ofTWT.The MDC of axisymmetric structure to improve the capability of TWT wasresearched by this paper based on computer-aided design software and mature experiencein the production of TWT. The test results showed that the designed MDC effectivelyimproved the capability of Ku band TWT. The main work is as follows:(1) The working principle and advantages of the MDC were introduced.(2) The result of large signal interaction in slow-wave circuit of TWT calculated byORION software was used as the entrance condition of the MDC.(3) High-efficiency MDC was designed by ORION software.(4) The MDC was designed by ANSYS software.(5) The manufacturing process of the MDC was optimized.(6) The DMC installed in TWT was tested.(7) The finished task was summarized at the same time the scheme for next taskpropounded.