曲折圆形槽波导慢波系统的高频特性

 对曲折圆形槽波导新型慢波系统的高频特性进行了研究，通过理论分析和数值计算，得到了它的色散曲线和耦合阻抗表达式，并分析了结构参数变化对色散特性和耦合阻抗的影响。研究表明：当周期变小时色散减弱，耦合阻抗增加；而增大直波导长度时色散变弱，但同时耦合阻抗也会下降。因此较小的周期有利于改善曲折圆形槽波导慢波电路的高频特性。鉴于这种电路的耦合阻抗较低，可以适当地减小直波导长度来提高耦合阻抗。曲折槽波导结合了曲折波导散热能力强、色散特性好、容易加工和槽波导单模工作、低损耗、大尺寸等优点，在毫米波及亚毫米波段的行波管中具有较好的发展前景。

Characteristics of serpentine circular groove guide slow-wave structure

Studying the high frequency properties of serpentine circular groove guide slow wave structure(SWS),the dispersion curves and interaction impedance are obtained by theoretic analysis and numerical computation.It is analyzed that the change of the structure parameter affects dispersion properties and interaction impedance.It shows that,dispersion property weakens and interaction impedance increases as the pitch L decreases.Though dispersion property weakens as the length of straight guide H increases,the interaction impedance still decreases.Therefore,short period is in favor of improving the high frequency properties of serpentine circular groove guide slow wave circuit,whereas the low interaction impedance of the circuit,interaction impedance can be improved by decreasing H properly.Because the serpentine groove guide combines the advantage of serpentine waveguide and groove waveguide,such as high heat scattering capacity,weak dispersion,easy fabrication,single mode transmission,lower losses and large dimension,it would be an excellent SWS in millimeter and sub-millimeter wave traveling-wave tubes(TWTs).