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角向传输线作为磁绝缘感应电压叠加器(MIVA)感应腔的关键部件,对MIVA感应腔馈入电流角向均匀分布,以及感应腔输出响应有决定性影响。为此,从馈入电流角向分布、阻抗匹配、绝缘安全等方面阐述了MIVA感应腔角向传输线的物理设计原则。针对双路和单路两种脉冲馈入方式,分别给出了优化的角向传输线结构。采用3维全尺寸、瞬态电磁模型对馈入电流角向分布和感应腔输出脉冲进行了模拟计算。结果表明,双路馈入MIVA感应腔馈入电流均匀性较好,设计角向传输线时首要考虑因素是降低角向线阻抗来改善感应腔输出脉冲响应,减小输出波形畸变。单路馈入MIVA感应腔馈入电流不均匀程度显著增大,采用非对称的角向线结构可提高馈入电流均匀性。双路和单路馈入MIVA感应腔电流角向不均匀系数最低分别为3%和9%。
As a key part of the MIVA sensing cavity, the transmission line of the angle is decisively influenced by the angular distribution of the feeding current in the MIVA cavity and the output response of the sensing cavity. For this reason, the physical design principles of MIVA sensing cavity angular transmission line are described in terms of the angular distribution of feed current, impedance matching and insulation safety. For the two-way and one-way two kinds of pulse feeding mode, respectively, the optimal structure of the transmission line is given. A 3-dimensional full-scale, transient electromagnetic model was used to simulate the angular distribution of the input current and the output pulse of the inductive cavity. The results show that the uniformity of the feed current of the dual-feed MIVA sensor cavity is better. The primary consideration when designing the angular transmission line is to reduce the impedance of the horn line to improve the output pulse response of the sensing cavity and reduce the output waveform distortion. The single-feed-in MIVA inductive cavity has a significant increase in the inhomogeneity of the feeding current, and the use of an asymmetrical corner line structure can improve the uniformity of the feeding current. The lowest current angular inhomogeneity of the dual and single feed-in MIVA inductors is 3% and 9% respectively.