廣義網(wǎng)絡(luò)原理在電磁散射混合方法中的應(yīng)用
THE APPLICATION OF GENERALIZED NETWORK PRINCIPLE TO HYBRID METHOD FOR ELECTROMAGNETIC SCATTERING
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摘要: 本文提出了一種分析電大開槽目標(biāo)電磁散射的混合方法。根據(jù)等效原理，將原目標(biāo)的散射場(chǎng)分解為電大目標(biāo)和槽縫散射場(chǎng)的疊加。前者用迭代物理光學(xué)法計(jì)算。對(duì)于后者，則先用時(shí)域有限差分法計(jì)算其導(dǎo)納矩陣，然后在口徑面上建立相應(yīng)的廣義網(wǎng)絡(luò)模型，用網(wǎng)絡(luò)分析的方法求得槽縫的等效磁流，最后由互易定理推得散射場(chǎng)的表達(dá)式。數(shù)值結(jié)果證明了本文方法的準(zhǔn)確性和高效性。
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關(guān)鍵詞:
- 廣義網(wǎng)絡(luò)原理;時(shí)域有限差分法;混合方法;電磁散射
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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