Title :
-Band Multiple Beam Staggered Double-Vane Traveling Wave Tube With Broad Band and High Output Power
Author :
Cunjun Ruan ; Muwu Zhang ; Jun Dai ; Changqing Zhang ; Shuzhong Wang ; Xiudong Yang ; Jinjun Feng
Author_Institution :
Sch. of Electron. & Inf. Eng., Beihang Univ., Beijing, China
Abstract :
A design study for a high-power, high-efficiency, high-growth-rate wideband traveling wave tube (TWT) in W-band using a staggered double-vane slow-wave structure (SWS) combined with three plan alignment pencil beams is described in this paper. The electromagnetic characteristic simulation shows that it has a wide bandwidth, high interaction impedance (about two to three times higher than those of the same structures with the sheet beam scheme), and a more simply designed input/output coupler. 3-D particle-in-cell simulations predict that the TWT can produce over 2000 W of output power from 91 to 95 GHz just using a 52-period two section SWS with a total length of 70.3 mm when the voltage and current of three pencil beams are set to 22 kV and 140 × 3 mA, respectively. The maximum peak output power is about 2256 W with a corresponding gain of 43.5 dB and an electronic efficiency of 12.2% at 94 GHz. The 3-dB bandwidth can be achieved at about 15 GHz with an instantaneous relative bandwidth of about 15.9%. Finally, the comparisons of sheet beam, multiple beam, and single pencil beam staggered double-vane TWT are presented and analyzed.
Keywords :
slow wave structures; travelling wave tubes; 3-D particle-in-cell simulations; W-band; frequency 91 GHz to 95 GHz; frequency 94 GHz; gain 43.5 dB; staggered double-vane slow-wave structure; traveling wave tube; voltage 22 kV; Bandwidth; Blades; Couplers; Impedance; Particle beams; Power generation; Solid modeling; Interaction impedance; W-band; W-band.; multiple beam; slow-wave structure (SWS); staggered double vane; traveling wave tube (TWT);
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2015.2435160