Folded-type waveguide and its application in high power millimeter wave and THz sources

Folded-type waveguide is a kind of significant slow wave structure (SWS) for developing high power millimeter wave and terahertz wave source. This paper reports the study on the folded type waveguide and its applications in millimeter wave and THz source in Vacuum Electronics National Laboratory(VENL) in China, in which the analysis and simulation of the RF properties and the electron beam-wave interaction characteristics in such kind of novel structures are given, moreover the experimental work are also illustrated. The prototypes of V-band and W-band traveling wave tubes based upon folded waveguide have been successfully manufactured and measured, our experimental test shows that tens of watts output power can be produced.