Millimeter wave traveling wave tubes are potentially effective and feasible power amplifier solutions for high data rate wireless communication. Research projects of high data rate wireless communication technology based on millimeter wave traveling wave tubes

whose operation frequency ranges are between 71 GHz and 300 GHz

are being developed abroad. The development of millimeter wave traveling wave tubes between 71 GHz and 235 GHz are presented. The enabling technologies of these devices are also overviewed

such as microfabrication of slow wave structures

novel design of slow wave structures and transmission with broadband and low loss.