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本文对同轴磁控管电磁系统进行了分析。分析时把系统看作是几个径向波导的组合,这些径向波导从阴极通过阳极叶片和内腔壁上的隙缝伸展到同轴外腔。得到了以隙缝为参考端的导纳(对于任意频率)。此导纳服从福斯特(Foster)电抗定理,它的零点揭示了系统的谐振特性。电纳随频率变化的速率揭示了系统的储能,并使我们能够计算它的R_(sh)/Q值。除了这些谐振腔的谐振以外,还有外腔和叶片系统组成的折迭线所产生的谐振。谐振时,线长等于半波长的整数倍,主π模对应于两个半波长,而另一个π模则出现在较低的频率(对应于一个半波长)和较高的频率上(对应于三个或三个以上的半波长。) 分析结果和VMS-1178同轴磁控管的测量值作了比较,各种观测到的振荡确实为理论所证实。
In this paper, the coaxial magnetron electromagnetic system is analyzed. The system was analyzed as a combination of several radial waveguides that extend from the cathode through the anode vanes and the slots in the lumen wall into the coaxial outer chamber. The admittance (for any frequency) with the slot as a reference is obtained. This admittance obeys the Foster reactance theorem, and its zero point reveals the resonance characteristics of the system. The rate at which the susceptance changes with frequency reveals the energy stored in the system and allows us to calculate its R_ (sh) / Q value. In addition to the resonances of these resonators, there is the resonance created by the fold lines of the external cavity and the vane system. At resonance, the length of the line is equal to an integer multiple of the half wavelength, the main π mode corresponds to two half wavelengths, and the other π mode appears at the lower frequency (corresponding to one and a half wavelengths) and higher frequency (corresponding to Three or more half-wavelengths.) The results of the analysis are compared with those of the VMS-1178 coaxial magnetron and the various oscillations observed are indeed validated by theory.