MoM-PO混合方法在电磁辐射中的应用

为了克服传统电磁场仿真方法不能有效解决某些特殊结构电磁辐射问题的弊端,充分借鉴矩量法(Method of Moment, MoM)和物理光学法(PO)各自的优点,提出一种MoM-PO混合方法.MoM-PO混合方法将天线划分为2个区域,并将2个区域用三角面元剖分,并在2个区域采用相同的屋顶基函数(RWG)来表征各自的表面电流,保证了2个区域边界上的电流连续性.分别在2个区域上应用MoM和PO,得到离散的矩阵方程,求解后即得电流分布.经数值算例验证,MoM-PO混合方法较传统的高频法,精度大大提高,与矩量法相比又在很大程度上减少了计算量,缩短了计算时间,是一种有效的电磁场计算方法.

The Application of MoM-PO Hybrid Method in EM Radiation

A MoM-PO hybrid method is proposed to solve some unusual electromagnetic (EM) radiation problems those cannot be solved by the traditional EM computation methods. By using this method, the antennas are divided into two regions, which are meshed by trigonal patches, and then RWG basis functions are defined in two regions. The methods of moment (MoM) and Physical Optics (PO) are used respectively in two regions, and the matrix equations are obtained. By solving equations, current distributing can be obtained. The numeration results show that MoM-PO hybrid method is more accurate than the traditional methods. The computation work done by using MoM-PO is greatly decreased compared with that done by using MoM. Simultaneously the computational efficiency is increased without losing validity. It is an effective EM numerical method.