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In this paper, based on the theory of mode-matching and the coupled wave theory, A W-band TE62 mode generator by using waveguide mode transformation is presented. Because of the eigen-mode selection of coaxial waveguide, a TE1 mode in standard rectangular waveguide is coupled into a coaxial waveguide to excite a TE61 mode by an aperture. A transition follows on it to change the coaxial waveguide into a circular one. Finally, TE61–TE62 mode converter is achieved by using a periodic radius perturbation in circular waveguide. Calculation and analysis of the relationship between the mode conversion efficiency and structure parameters of waveguide also are finished. The validity of this study is confirmed by using electromagnetic simulation software. The conversion efficiency of TE62 mode reaches 94.5% at the center frequency 95 GHz, and the mode purity reaches 98.16% The bandwidth of the efficiency above 85% reaches 1 GHz, which can meet the demand of the high–frequency cold test of gyrotrons.
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Keywords:
- coaxial waveguide /
- mode converter /
- coupled wave theory /
- radius perturbation
[1] Liu P K, Xu S X 2003 Journal of Electronics and Information Technology 25 683 (in Chinese) [刘濮鲲, 徐寿喜 2003 电子与信息学报 25 683]
[2] Dammertz G, Alberti S, Aronld A, Giguet E, LeGoff Y, Thumm M 2001 Fusion Engineering and Design. 53 561
[3] Du C H, Xue Q Z, Liu P K 2010 Chin. Phys. B 19 048703
[4] Sun Y Y, Zhang S C 2011 Acta Phys. Sin. 60 095201 (in Chinese) [孔艳岩, 张世昌 2011 物理学报 60 095201]
[5] Luo Y T, Tang C J, Liu C, Liu P K 2009 Acta Phys. Sin. 58 8174 (in Chinese) [罗尧天, 唐昌建, 刘畅, 刘濮鲲 2009 物理学报 58 8174]
[6] Jory H, Wagner D, Blank M, Chu S, Felch K 2001 Int. Journal of Infrared and Millimeter Waves. 22 1395
[7] Alexandrov N L, Chirkov A V, Denisov G G, Vinogradov D V, Kasparek W, Pretterebner J, Wagner D 1992 Int. Journal of Infrared and Millimeter Waves. 13 1369
[8] Li S F, Zhang C H, Wang Z, Chen H B, Hu L L, Pan W W, Guo F 2011 High Power Laser and Particle Beams 23 2174 (in Chinese) [李少甫, 张从会, 王忠, 陈洪斌, 胡林林, 潘文武, 郭峰 2011 强激光与粒子束 23 2174]
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[10] Wang B, Liu P K, Geng Z H 2010 J. Infrared Millim. Wave 29 109 (in Chinese) [王斌, 刘濮鲲, 耿志辉 2010 红外与毫米波学报 29 109]
[11] Wang B, Du C H, Liu P K, Geng Z H, Xu S X 2010 Acta Phys. Sin. 59 2512 (in Chinese) [王斌, 杜朝海, 刘濮鲲, 耿志辉, 徐寿喜 2010 物理学报 59 2512]
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[13] McCurdy A H, Choi J J 1999 IEEE. Trans. Microw. Theory Tech. 47 164
[14] Wang W X, Gong Y B, Yu G F, Yue L N, Sun J H 2003 IEEE. Trans. Microw. Theory Tech. 51 55
[15] Chang T H, Li C H, Wu C N, Yu C F 2010 IEEE. Trans. Microw. Theory Tech. 58 1543
[16] Peng W, Liu P K, Geng Z H 2010 Vacuum Electronics 5 1 (in Chinese) [彭伟, 刘濮鲲, 耿志辉 2010 真空电子技术 5 1]
[17] Yang S W, Tan S H, Li H F 2000 Int. Journal of Infrared and Millimeter Waves, 21 219
[18] Li H F, Thumm M 1991 Int. Journal of Electronics 71 827
[19] Lan F, Yang Z Q, Shi Z J 2012 Acta Phys. Sin. 61 155 (in Chinese) [兰峰, 杨梓强, 史宗君 2012 物理学报 61 155]
[20] Du R B, Luo Y, Niu X J 2008 High Power Laser and Particle Beams 20 99 (in Chinese) [杜人波, 罗勇, 牛新建 2008 强激光与粒子束 20 99]
[21] Niu X J, Li H F, Yu S, Xie Z L, Yang S W 2002 Acta Phys. Sin. 51 2291 (in Chinese) [牛新建, 李宏福, 喻胜, 谢仲怜, 杨仕文 2002 物理学报 51 2291]
[22] Yuan C W, Zhong H H, Liu Q X, Qian B L 2005 High Power Laser and Particle Beams 17 1251 (in Chinese) [袁成卫, 钟辉煌, 刘庆想, 钱保良 2005 强激光与粒子束 17 1251]
[23] Niu X J, Gu L, Yu S, Li H F 2007 J. Infrared Millim. Wave 26 117 (in Chinese) [牛新建, 顾玲, 喻胜, 李宏福 2007 红外与毫米波学报 26 117]
[24] Chen L W, Niu X J, Li X Y, Sun M 2004 J. Infrared Millim. Wave 23 51 (in Chinese) [陈立伟, 牛新建, 李晓燕, 孙敏 2004 红外与毫米波学报 23 51]
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[1] Liu P K, Xu S X 2003 Journal of Electronics and Information Technology 25 683 (in Chinese) [刘濮鲲, 徐寿喜 2003 电子与信息学报 25 683]
[2] Dammertz G, Alberti S, Aronld A, Giguet E, LeGoff Y, Thumm M 2001 Fusion Engineering and Design. 53 561
[3] Du C H, Xue Q Z, Liu P K 2010 Chin. Phys. B 19 048703
[4] Sun Y Y, Zhang S C 2011 Acta Phys. Sin. 60 095201 (in Chinese) [孔艳岩, 张世昌 2011 物理学报 60 095201]
[5] Luo Y T, Tang C J, Liu C, Liu P K 2009 Acta Phys. Sin. 58 8174 (in Chinese) [罗尧天, 唐昌建, 刘畅, 刘濮鲲 2009 物理学报 58 8174]
[6] Jory H, Wagner D, Blank M, Chu S, Felch K 2001 Int. Journal of Infrared and Millimeter Waves. 22 1395
[7] Alexandrov N L, Chirkov A V, Denisov G G, Vinogradov D V, Kasparek W, Pretterebner J, Wagner D 1992 Int. Journal of Infrared and Millimeter Waves. 13 1369
[8] Li S F, Zhang C H, Wang Z, Chen H B, Hu L L, Pan W W, Guo F 2011 High Power Laser and Particle Beams 23 2174 (in Chinese) [李少甫, 张从会, 王忠, 陈洪斌, 胡林林, 潘文武, 郭峰 2011 强激光与粒子束 23 2174]
[9] Alexandrov N L, Denisov G G, Whaley D R, Tran M Q 1995 Int. Journal of Electronics 79 215
[10] Wang B, Liu P K, Geng Z H 2010 J. Infrared Millim. Wave 29 109 (in Chinese) [王斌, 刘濮鲲, 耿志辉 2010 红外与毫米波学报 29 109]
[11] Wang B, Du C H, Liu P K, Geng Z H, Xu S X 2010 Acta Phys. Sin. 59 2512 (in Chinese) [王斌, 杜朝海, 刘濮鲲, 耿志辉, 徐寿喜 2010 物理学报 59 2512]
[12] Marek E, Bialkowski J, Bornemann V, Waris P, Paul W D 1995 IEEE. Trans. Microw. Theory Tech. 43 1875
[13] McCurdy A H, Choi J J 1999 IEEE. Trans. Microw. Theory Tech. 47 164
[14] Wang W X, Gong Y B, Yu G F, Yue L N, Sun J H 2003 IEEE. Trans. Microw. Theory Tech. 51 55
[15] Chang T H, Li C H, Wu C N, Yu C F 2010 IEEE. Trans. Microw. Theory Tech. 58 1543
[16] Peng W, Liu P K, Geng Z H 2010 Vacuum Electronics 5 1 (in Chinese) [彭伟, 刘濮鲲, 耿志辉 2010 真空电子技术 5 1]
[17] Yang S W, Tan S H, Li H F 2000 Int. Journal of Infrared and Millimeter Waves, 21 219
[18] Li H F, Thumm M 1991 Int. Journal of Electronics 71 827
[19] Lan F, Yang Z Q, Shi Z J 2012 Acta Phys. Sin. 61 155 (in Chinese) [兰峰, 杨梓强, 史宗君 2012 物理学报 61 155]
[20] Du R B, Luo Y, Niu X J 2008 High Power Laser and Particle Beams 20 99 (in Chinese) [杜人波, 罗勇, 牛新建 2008 强激光与粒子束 20 99]
[21] Niu X J, Li H F, Yu S, Xie Z L, Yang S W 2002 Acta Phys. Sin. 51 2291 (in Chinese) [牛新建, 李宏福, 喻胜, 谢仲怜, 杨仕文 2002 物理学报 51 2291]
[22] Yuan C W, Zhong H H, Liu Q X, Qian B L 2005 High Power Laser and Particle Beams 17 1251 (in Chinese) [袁成卫, 钟辉煌, 刘庆想, 钱保良 2005 强激光与粒子束 17 1251]
[23] Niu X J, Gu L, Yu S, Li H F 2007 J. Infrared Millim. Wave 26 117 (in Chinese) [牛新建, 顾玲, 喻胜, 李宏福 2007 红外与毫米波学报 26 117]
[24] Chen L W, Niu X J, Li X Y, Sun M 2004 J. Infrared Millim. Wave 23 51 (in Chinese) [陈立伟, 牛新建, 李晓燕, 孙敏 2004 红外与毫米波学报 23 51]
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