20.3: High power Ka-band Folded Waveguide Traveling-Wave Tube

A Ka-band Traveling-Wave Tube was Fabricated with Folded Waveguide as its slow wave structure. When the beam voltage is 24 KV and the beam current is 0.4 A, respectively. The test result show it can produces over 500 W of saturable output power with more than 2.5 GHz bandwidth. It is the first time the folded wave guide TWT reached more than 500 W at Ka band and also the first device to obtain such high level power source at Ka band with more than 2.5 GHz bandwidth. Our experiment shows that the folded waveguide will be a great challenge type of high power millimeter source compare with helix TWT and coupled cavity TWT. Because this TWT can be easily manufactured and assembled with high power and broad bandwidth output, it is hopeful to take part of the helix TWT and coupled cavity TWT and in some application field as a high power millimeter source..