利用近场Gordon积分近似的矩量法-物理光学混合方法

Efficient hybrid MoM-PO technique with near-field Gordon integral

针对电大金属目标的电磁计算,提出了一种新的矩量法-物理光学(Method of Moment-Physical Optics,MoM-PO)混合方法,以解决传统的MoM-PO混合法中PO区域和MoM区域耦合项的计算时间过长问题.用Gordon积分计算目标的PO区域对MoM区域的作用,并加入近场近似处理.该方法避免了传统的MoM-PO混合法中耦合项积分方程的计算,加大PO区域的剖分面元的大小,能够有效地降低矩阵规模和未知数个数,因而降低了内存,减少了计算时间.数值算例结果表明,近场Gordon积分近似的MoM-PO混合方法能够有效地减少耦合项的计算时间,并能达到理想的精度.

For the electromagnetic calculation of electrically large conducting object, a new hybrid method of moments-physical optics（MoM-PO） technique is presented to overcome the time-consuming in calculating the coupling term of PO region and MoM region with the increase of the target size by using the conventional hybrid MoM-PO method. The near-field scattering is calculated by Gordon integral to avoid the calculation of the integral equation of the coupling term of the conventional method and to increase the mesh size of PO region, which provides the possibility to reduce the computational time and computer memory. The results of numerical examples indicate the effectiveness of the new method. Compared with the traditional hybrid MoM-PO method, the computational time of the coupling term is reduced. Mean- while, appropriate accuracy can be achieved.