广义网络原理在电磁散射混合方法中的应用
THE APPLICATION OF GENERALIZED NETWORK PRINCIPLE TO HYBRID METHOD FOR ELECTROMAGNETIC SCATTERING
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摘要: 本文提出了一种分析电大开槽目标电磁散射的混合方法。根据等效原理，将原目标的散射场分解为电大目标和槽缝散射场的叠加。前者用迭代物理光学法计算。对于后者，则先用时域有限差分法计算其导纳矩阵，然后在口径面上建立相应的广义网络模型，用网络分析的方法求得槽缝的等效磁流，最后由互易定理推得散射场的表达式。数值结果证明了本文方法的准确性和高效性。Abstract: A new hybrid method based on the generalized network principle is proposed to deal with the electromagnetic scattering of a large body with cracks.Using the equivalence theorem,the total scattered field can be regarded as the summation of two parts,the scattering of the large body and that of the cracks.The former is calculated by using iterative physical optical (IPO) method directly and the latter can be computed as follows:First,the admittance matrix of the crack is extracted by using the FDTD method,thus the generalized network representation of the crack can be set up on the aperture.Then the equivalent magnetic current on the crack aperture can be computed by network principles.According to the reciprocity theorem,the scattering from the crack can be obtained finally.Some numerical results show the feasibility and efficiency of the proposed method.
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