Title :
A 1-kW 32–34-GHz Folded Waveguide Traveling Wave Tube
Author :
Huarong Gong ; Jin Xu ; Tao Tang ; Yanyu Wei ; Yubin Gong ; Changqing Zhang ; Xiaogang Su ; Shaolun Cai ; Gang Wu ; Jinjun Feng
Author_Institution :
Vacuum Electron. Nat. Lab., Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
Folded waveguide (FWG) traveling wave tubes (TWTs) are potential sources of wideband, high-power millimeter and terahertz wave radiation. However, low efficiency limits its application. In this paper, we discuss a design strategy to improve efficiency of the FWG TWT meanwhile how to avoid instability is also discussed. The critical factors for the slow-wave structure design and the sever design are analyzed. A phase velocity taper profile incorporating a positive period followed by a negative period is introduced into the design to improve the efficiency. A Ka-band FWG TWT was developed, which demonstrated the output power up to in 2-GHz bandwidth and electronic efficiency up to .
Keywords :
millimetre wave tubes; slow wave structures; Ka-band FWG TWT; bandwidth 2 GHz; electronic efficiency; folded waveguide traveling wave tube; frequency 32 GHz to 34 GHz; phase velocity taper profile; power 1 kW; slow-wave structure design; Attenuators; Cavity resonators; Couplings; Educational institutions; Electron tubes; Impedance; Power generation; Electric efficiency; folded waveguide (FWG); phase velocity taper; traveling wave tubes (TWTs);
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2013.2290137
