Analysis of a Novel Ka-band Folded Waveguide Amplifier for Traveling-Wave Tubes
LIAO Ming-Liang1, WEI Yan-Yu1, HE Jun1, GONG Yu-Bin1, WANG Wen-Xiang1, Gun-Sik Park2
1National Key Laboratory of High Power Vacuum Electronics, School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 6100542Department of Physics, Seoul National University, Seoul 151-747, Korea
Analysis of a Novel Ka-band Folded Waveguide Amplifier for Traveling-Wave Tubes
LIAO Ming-Liang1, WEI Yan-Yu1, HE Jun1, GONG Yu-Bin1, WANG Wen-Xiang1, Gun-Sik Park2
1National Key Laboratory of High Power Vacuum Electronics, School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 6100542Department of Physics, Seoul National University, Seoul 151-747, Korea
摘要A novel Ka-band folded waveguide (FW) amplifier for traveling wave tubes (TWT) is investigated. The dispersion curve and interaction impedance are obtained and compared to the normal FW circuit by numerical simulation. The interaction impedance is higher than a normal circuit through the whole band. We also study the beam-wave interaction in this novel circuit, and the nonlinear large-signal performance is analyzed by a 3-D particle-in-cell code MAGIC3D. A much higher continuous-wave (CW) output power with a considerably shorter circuit compared to a normal circuit is predicted by our simulation. Moreover, the novel FW even has a broader 3-dB bandwidth. It therefore will be useful in designing a miniature but high-power and broadband millimeter-wave TWT.
Abstract：A novel Ka-band folded waveguide (FW) amplifier for traveling wave tubes (TWT) is investigated. The dispersion curve and interaction impedance are obtained and compared to the normal FW circuit by numerical simulation. The interaction impedance is higher than a normal circuit through the whole band. We also study the beam-wave interaction in this novel circuit, and the nonlinear large-signal performance is analyzed by a 3-D particle-in-cell code MAGIC3D. A much higher continuous-wave (CW) output power with a considerably shorter circuit compared to a normal circuit is predicted by our simulation. Moreover, the novel FW even has a broader 3-dB bandwidth. It therefore will be useful in designing a miniature but high-power and broadband millimeter-wave TWT.
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2009, Vol. 26 
