電大尺寸復(fù)雜結(jié)構(gòu)腔體電磁散射的IPO/FEM混合法研究
Investigation on EM scattering by electrically large complex cavity using IPO/FEM hybrid method
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摘要: 該文將物理光學(xué)迭代法(IPO)的子域連接法與矢量有限元法(FEM)相結(jié)合，提出了一種新的混合方法用于分析計(jì)算電大尺寸復(fù)雜結(jié)構(gòu)腔體目標(biāo)的電磁散射特性。對(duì)于腔體內(nèi)部適合用高頻方法處理的部分采用IPO方法分析；對(duì)于具有復(fù)雜結(jié)構(gòu)和材料特性的部分，采用矢量有限元法進(jìn)行研究,利用交界面上的連續(xù)性條件實(shí)現(xiàn)這兩種方法的耦合。為了驗(yàn)證理論模型的正確性，該文對(duì)某一矩形空腔及底部加載金屬臺(tái)階的腔體進(jìn)行了分析，計(jì)算結(jié)果與文獻(xiàn)數(shù)據(jù)以及用時(shí)域有限差分法所得結(jié)果一致，并具有很好的收斂效果。在此基礎(chǔ)上，對(duì)底部加載介質(zhì)層的復(fù)雜結(jié)構(gòu)腔體進(jìn)行了分析計(jì)算，結(jié)果表明這種混合方法對(duì)于分析電大尺寸復(fù)雜結(jié)構(gòu)腔體的散射特性是行之有效的。
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關(guān)鍵詞:
- 混合法; 物理光學(xué)迭代法; 子域連接法; 有限元法; 電磁散射
Abstract: In this paper, a novel hybrid approach is proposed in which Iterative Physical Optics (IPO)subdomain splicing technique is combined with edge-based finite element method. It is applied to the analyses of electromagnetic scattering characteristics of electrically large complex cavities. IPO approach is applied for the region where it is suitable to use high frequency method; the edge-based finite element method is employed for the region where complex structures or complex materials are located. At the interface, the field continuous condition is applied to realize the coupling of the two regions. To verify the new approach, an open-ended empty rectangular cavity and cavity loaded with a metal cuboid are analyzed. The numerical results are in agreement with the published data and those obtained by FDTD. Good convergence behavior is observed. Moreover, complex cavities where three layers of lossy dielectric or a metal cuboid is loaded at the bottom are analyzed. The results show that the proposed hybrid approach is efficient for analyzing the electromagnetic scattering characteristic of electrically large complex cavity. -
阮穎錚,空腔結(jié)構(gòu)電磁散射分析方法研究,電波科學(xué)學(xué)報(bào),1994,9(1),73-82.[2]P.H. Pathak, R. J. Burkholder, Mode, ray and beam techniques for analyzing the EM scattering by open-ended waveguide cavities, IEEE Trans. on AP., 1989, AP-37(5), 635-647.[3]P.H. Pathak, R. J. Burkholder, High-frequency electromagnetic scattering by open-ended waveguide cavities, Radio Sci., 1991, 26(1), 211-218.[4]王樹民,李明之,王長(zhǎng)清,GRE-FDTD混合法對(duì)二維矩形終端任意形狀進(jìn)氣道RCS的計(jì)算,電子學(xué)報(bào),2000,28(6),138-141.[5]Robert Lee, Tsc-Tong Chia, Analysis of electromagnetic scattering from a cavity with a complex termination by means of a hybrid ray-FDTD method, IEEE Trans. on AP, 1993, AP-41(11),1560-1569.[6]Liu Jian, Jin Jian-ming, A special higher order finite-element method for scattering by deep cavities, IEEE Trans. on AP., 2000, AP-48(5), 694-703.[7]F. Obelleiro, J. Luis Rodriguez, R. J. Burkholder, An iterative physical optics approach for analyzing the electromagnetic scattering by large open-ended cavities, IEEE Trans. on AP.,1995, AP-43(4), 356-361.[8]顧長(zhǎng)青,舒永澤,徐金平,物理光學(xué)迭代法的子域連接法,電子學(xué)報(bào),2001,29(3),420-422. ［9］Tsc-Tong Chia, Robert J. Burkholder, Robert Lee, The application of FDTD in hybrid methods for cavity scattering analysis, IEEE Trans, on AP., 1995, AP-43(10), 1082-1089. -
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