运用模匹配法设计高功率高效率多模馈源

 在高功率微波天线系统中，要求馈源具有高功率容量和良好的辐射特性，内壁光滑的变张角结构多模馈源能够满足这一要求。在单级模匹配理论的基础上，给出了多个突变结构级联S参数矩阵的实现方法，并编制了数值计算程序。运用程序分析了各种不同结构光壁喇叭馈源，得到了其中各个模式之间的耦合关系及其口面辐射特性的变化。在大量计算的基础上，得到了Φ400 mm口面直径的高功率高效率多模馈源设计方案，理论功率容量大于1.5 GW，同时具有良好的轴对称辐射特性。实验与理论分析结果具有良好的一致性。

Design of high power and high efficient multimode feed by MMT

In an HPM radiation system, the horn feeds which have high power capacity and favorable radiation performance are required. The multimode and smooth-wall horn can fulfill the requirement. Based on the single step mode-matching technololgy, the method to get the scatter matrix of the smooth-profile horn was presented. By the method, the process of modes coupling which happened when TEll mode was incident to horn feed was analyzed. The relationship of mode coupling and the change of radiation performance was investigated. Through simulation and selection, the primary design model, which had high power capacity above 1.5 GW and favorable radiation performance, was obtained and measured. Excellent correspondence between the experimental result and theory was demonstrated.