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Based on a staggered double-grating slow wave structure with step-shaped grooves, the expressions of the electromagnetic field in it have been obtained and the formulae of the dispersion equation and coupling impedance have been solved by means of field matching method. As an example, a staggered double-grating slow wave structure for W band TWT application was used to calculate the characteristics of dispersion and coupling impedance using the formulae and CST-MWS code, and analyze the effect of the step dimension variation on the high frequency characteristics. Results show that the theoretical calculations are in good agreement with the CST-MWS code simulations, and the slow wave structure can improve the dispersion characteristics, enhance interaction bandwidth, while keeping a proper coupling impedance and mechanical intensity, which can to some extent compensate for the deficiency in the staggered double-grating slow wave structure with the rectangular-shaped grooves.
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Keywords:
- field matching method /
- step shaped groove /
- staggered double-grating slow wave structure /
- high frequency characteristics
[1] Lin Y Y, Huang Y C 2007 Physical Review Special Topics-Accelerators and Beams 10 030701
[2] Shin Y M, Barnett L R 2008 Appl. Phys. Lett. 92 091501
[3] ShinY M, Barnett L R, Luhmann N C 2009 IEEE Trans. Elec. Dev. 56 706
[4] Liu Q L, Wang Z C, Liu P K 2012 Acta Phys. Sin. 61 244102 (in Chinese) [刘青伦, 王自成, 刘濮鲲 2012 物理学报 61 244102]
[5] Lai J Q, Gong Y B, Xu X, Wei Y Y, Duan Z Y, Wang W X, Feng J J 2012 IEEE Trans. Elec. Dev. 59 496
[6] Lai J Q, Wei Y Y, Liu Y, Huang M Z, Tang T, Wang W X, Gong Y B 2012 Chin. Phys. B 21 068403
[7] Liu Q L, Wang Z C, Liu P K, Du C H, Li H Q, Xu A Y 2013 IEEE Trans. Elec. Dev. 60 1463
[8] S. Ramo, J. Whinnery, and T. Van Duzer 1965 Fields and Waves in Communication Electronics(New York: Wiley) p598
[9] Lu Z G, Wei Y Y, Gong Y B, Wang W X 2006 J. Infrared Millim. Waves 25 349 [路志刚, 魏彦玉, 宫玉彬, 王文祥 2006 红外与毫米波学报 25 349]
[10] Wang W X, Guo F Y, Wei Y Y 1997 IEEE Trans. Microw. Theory Tech. 45 1689
[11] Zhang K Q, Li D J 2001 Electromagnetic Theory for Microwaves and Optoelectronics (The second edition) (Beijing: Electronic Industry Press) p411 (in Chinese)[张克潜, 李德杰 2001 微波与光电子学中的电磁理论(第二版)(北京: 电子工业出版社) 第411页]
[12] Liu S G, Li H F, Wang W X, Mo Y L 1985Introduction of Microwave Electronics (Beijing: National Defence Industry Press) p104 (in Chinese) [刘盛纲, 李宏福, 王文祥, 莫元龙 1985 微波电子学导论(北京: 国防工业出版社)第104页]
[13] Li Q Y, Wang N C, Yi D Q 2008 Numerical Analysis (Beijing: Qinghua University Press) p229 (in Chinese) [李庆扬, 王能超, 易大义 2008 数值分析(北京: 清华大学出版社) 第229页]
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[1] Lin Y Y, Huang Y C 2007 Physical Review Special Topics-Accelerators and Beams 10 030701
[2] Shin Y M, Barnett L R 2008 Appl. Phys. Lett. 92 091501
[3] ShinY M, Barnett L R, Luhmann N C 2009 IEEE Trans. Elec. Dev. 56 706
[4] Liu Q L, Wang Z C, Liu P K 2012 Acta Phys. Sin. 61 244102 (in Chinese) [刘青伦, 王自成, 刘濮鲲 2012 物理学报 61 244102]
[5] Lai J Q, Gong Y B, Xu X, Wei Y Y, Duan Z Y, Wang W X, Feng J J 2012 IEEE Trans. Elec. Dev. 59 496
[6] Lai J Q, Wei Y Y, Liu Y, Huang M Z, Tang T, Wang W X, Gong Y B 2012 Chin. Phys. B 21 068403
[7] Liu Q L, Wang Z C, Liu P K, Du C H, Li H Q, Xu A Y 2013 IEEE Trans. Elec. Dev. 60 1463
[8] S. Ramo, J. Whinnery, and T. Van Duzer 1965 Fields and Waves in Communication Electronics(New York: Wiley) p598
[9] Lu Z G, Wei Y Y, Gong Y B, Wang W X 2006 J. Infrared Millim. Waves 25 349 [路志刚, 魏彦玉, 宫玉彬, 王文祥 2006 红外与毫米波学报 25 349]
[10] Wang W X, Guo F Y, Wei Y Y 1997 IEEE Trans. Microw. Theory Tech. 45 1689
[11] Zhang K Q, Li D J 2001 Electromagnetic Theory for Microwaves and Optoelectronics (The second edition) (Beijing: Electronic Industry Press) p411 (in Chinese)[张克潜, 李德杰 2001 微波与光电子学中的电磁理论(第二版)(北京: 电子工业出版社) 第411页]
[12] Liu S G, Li H F, Wang W X, Mo Y L 1985Introduction of Microwave Electronics (Beijing: National Defence Industry Press) p104 (in Chinese) [刘盛纲, 李宏福, 王文祥, 莫元龙 1985 微波电子学导论(北京: 国防工业出版社)第104页]
[13] Li Q Y, Wang N C, Yi D Q 2008 Numerical Analysis (Beijing: Qinghua University Press) p229 (in Chinese) [李庆扬, 王能超, 易大义 2008 数值分析(北京: 清华大学出版社) 第229页]
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