分别采用热解沉积、胶体石墨涂刷和电弧放电法在行波管(TWT)刚玉支撑杆上涂覆了吸波炭涂层,以改善TWT稳定性.通过一种带孔窄频-高波-道管的实验装置,应用无向量网络解析器实施反射和透射波测量,测得6.0GHz频段涂层杆的衰减程度.并利用一种软件高频结构模拟器(HFSS)进行了模拟.结果表明:胶体石墨涂层显示出最大的损失或吸光率.是适宜的衰减器涂料.HFSS模拟的结果与实验结果吻合.
Attenuator coatings of carbon were deposited on alumina support rods by pyrolytic deposition,aquadag coating and arc discharge to absorb the reflections and to improve the stability of a helical traveling wave tube.An experimental set up involving a narrow-height wave-guide with a hole was used to measure the attenuation of the coated rods at 6.0 GHz frequency by carrying out reflection and transmission measurements using a scalar network analyzer.The same structure was also simulated by using a high frequency structure simulator (HFSS).Results indicate that the aquadagcoated films provide a maximum loss or absorbance and are suitable as the attenuator coating.The simulated results by HFSS agree well with the experimental observations.
参考文献
| [1] | Gilmour A S Jr.Principles of Travelling Wave Tube[M].Boston,London:Artech House,1994 |
| [2] | Basu B N.Electomagnetic Theory and Applications in Beam Wave Electronics[M].Singapore:World Scientific Publishing Co.Ptc.Ltd,1996 |
| [3] | Gittins J F.Power Travelling Wave Tubes[M].New York:Elsevier,1965 |
| [4] | Dan M. Goebel;John G. Keller;William L. Menninger;Steven T. Blunk .Gain stability of traveling wave tubes[J].IEEE Transactions on Electron Devices,1999(11):2235-2244. |
| [5] | Ang LK.;Lau YY. .Absolute instability in a traveling wave tube model[J].Physics of plasmas,1998(12):4408-4410. |
| [6] | Vikas Kumar;Vishnu Srivastava;Anil Vohra .Design of input and output sections of a high gain TWT and measurement of their loss profiles[J].International Journal of Microwave and Optical Technologies,2006,1(02):275. |
| [7] | Vikas Kumar;Anil Vohra;Vishnu Srivastava.Microwave Attenuation Measurements on Tetrahedral Amorphous Carbon Coatings for TWT Applications[A].,2005:261-264. |
| [8] | Vikas Kumar;Anil Vohra;Vishnu Srivastava .RF loss profile measurement for a high gain,broadband helix TWT[J].INDIAN JOURNAL OF RADIO & SPACE PHYSICS,2006,35(02):129-132. |
| [9] | Vikas Kumar;Anil Vohra;Vishnu Srivastava .Nickel and iron as attenuator materials for helix TWT[J].INDIAN JOURNAL OF RADIO & SPACE PHYSICS,2007,36(04):345-347. |
| [10] | Vossen J L;Kern W.Thin film Processes Ⅱ[M].Boston;Academic PressInc,1991 |
| [11] | Users manual of HP8757D[M].Hewlett Packard Corporation,1996 |
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