模式匹配与积分方程在HPM模拟中的应用

针对具有电大尺寸、厚介质罩且馈源采用特定模式激励的高功率微波(HMP)传输及辐射结构研究了一种新型的电磁建模技术。将模式匹配方法与积分方程方法进行混合,构建了电磁模型的方程组,采用多层快速多极子技术、预条件器等进行求解加速,最终形成了可对电大尺寸HPM传输、辐射系统进行高效全波电磁仿真的技术。以电大变张角喇叭馈源、功率合成天线、波束波导及波束波导天线作为实例,构建了几何及电磁模型,并进行了包括远区方向图、近区功率密度分布在内的数值模拟,对该技术的正确性和通用性进行了验证。结果表明,该技术边界拟合准确,内存消耗低,且对馈电模式能予以准确反映,适用于HPM传输发射的高效高精度模拟。

Applications of mode-matching and integral equation method to HPM simulation research

A new-type of electromagnetic modeling technology for high power microwave (HPM) transmission and radiation structures with large electrical-size and thick radome is studied. Hybrid equations are established by combining mode-matching and integral equation method. Multilevel fast multipole algorithm and preconditioners are used to accelerate this method. Some numerical examples are given out to validate the accuracy and the applicability, including flare-angle-tapered feed horn, power-combined antenna, beam waveguide and beam-waveguide antenna system. Far-field patterns and near-field power density distributions are simulated. The simulation results show that this new technology can fit the boundaries and model the feeding mode accurately. Computer memory cost is reduced using this method. Applicability and ascendant of this method are validated. Some aspects which can be improved are also discussed in this paper.