All-metal meta material slow-wave structure for high-power sources with high efficiency

In this paper, we have proposed a metamaterial (MTM) which is suitable for the compact high-power vacuum electron devices. For example, an S:band slow-wave structure (SWS) based on the all-metal MTMs has been studied by both simulation and experiment. The results show that this MTM SWS is very helpful to miniaturize the high-power vacuum electron devices and largely improve the output power and the electronic efficiency. The simulation model of an S-hand MTM backward wave oscillator (BWO) is built, and the particle-in-cell simulated results are presented here: a 2,454 GHz signal is generated and its peak output power is 4.0 MW with a higher electronic efficiency of 31.5% relative to the conventional BWOs. (C) 2015 AIP Publishing LLC,