Analysis of Helix Slow Wave Structure for High Efficiency Space TWT |
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Authors: | Mukesh Kumar Alaria A Bera A K Sinha V Srivastava |
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Affiliation: | (1) Microwave Tubes Area, Central Electronics Engineering Research Institute, Pilani, 333031, India |
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Abstract: | This paper describes the analysis of helix slow-wave structure (SWS) for a high efficiency space traveling wave tube that
is carried out using Ansoft HFSS and CST microwave studio, which is a 3D electromagnetic field simulators. Two approaches
of simulating the dispersion and impedance characteristics of the helix slow wave structure have been discussed and compared
with measured results. The dispersion characteristic gives the information about axial propagation constant (Beta). Which
in turn yields the phase velocity at a particular frequency. The dispersion and impedance characteristics can be used in finding
the pertinent design parameters of the helix slow-wave structure. Therefore a new trend has been initiated at CEERI to use
Ansoft HFSS code to analysis of the helix slow wave structure in its real environment. The analysis of the helix SWS for Ku-band
140W space TWT has been carried out and compared with experimental results, and found is close agreement. |
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Keywords: | Dispersion Interaction impedance Helix slow-wave structure (SWS) Traveling wave tube (TWT) Tip loss |
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