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Design and Development of Helix Slow-Wave Structure for Ku-Band TWT

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4 Author(s)
Alaria, M.K. ; Central Electron. Eng. Res. Inst., CSIR, Pilani, India ; Bera, A. ; Sharma, R.K. ; Srivastava, V.

A helix slow-wave structure (SWS) for a high-efficiency (electronic efficiency >; 25%) Ku-band 140-W space traveling-wave tube (TWT) has been designed. The cold circuit parameters of helix SWS, like propagation constant and on-axis interaction impedance, were determined using 3-D electromagnetic field simulators ANSOFT-HFSS and CST-MWS, and those were validated with the experimental results. The in-house developed large-signal code SUNRAY-1D was used to design a complete helix SWS in two sections with sever and taper to achieve desired output power, gain, efficiency, and other linearity parameters like phase shift, AM/PM factor, and I/M components. The simulated RF performance of the Ku-band 140-W helix TWT was validated with the experimental results. A close agreement between the simulated and experimental results has been found.

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Plasma Science, IEEE Transactions on  (Volume:39 ,  Issue: 1 )