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Investigation of a novel folded waveguide slow wave structure for traveling wave tube

A novel taper ridge-vane loaded folded waveguide (FWG) slow wave structure (SWS) for 140 GHz traveling wave tube (TWT) has been presented in this paper. The electromagnetic characteristics and beam-wave interaction of this kind of structure are calculated. It is shown from our calculation results that the new kind of circuit is a promising SWS for developing a wide band high-power millimeter wave, even Terahetrz radiation source.