Large-Domain Hybrid Moment Method-Physical Optics Techniques for Efficient and Accurate Electromagnetic Modeling of Cars and Aircraft over a Wide Range of Frequencies

[01:15 . 756] nonos拟议研究的中心目标是开发汽车和飞机在非常广泛的无线电和微波频率范围内进行电磁建模的方法和必要知识。将车辆作为电磁结构（天线和散射体）以及无线通信和雷达系统的一部分进行分析，无论如何，都是应用电磁学中最具挑战性和最重要的实际问题之一，也是计算电磁学（CEM）界在当今和未来最受青睐的主流任务之一。一种新的统一、通用、高效、准确的混合大域（高阶展开）电流方法将被开发出来，用于分析由任意形状的金属和介电部件组成的电小型、中型和超大型三维电磁结构。该方法的理论基础是等效表面电、磁电流的耦合表面积分方程组。将矩量法（MoM）与基于物理光学（PO）的高频渐近技术相结合，对系统进行求解。这种杂交将提供低频和高频应用之间的平稳过渡。在新的momo - po方法中，系统中的所有表面（金属和介电表面，在MoM-和po -区域）将由电相对较大的双线性四边形表面单元（大域）近似，具有电流的高阶多项式向量展开。电线也将被纳入，在mom -区域。将介绍po -区域中的各种修正，包括MoM-和po -区域之间相互作用的迭代改进。最重要的是，与po区域中的未知数相关的内存需求和计算时间可以非常低，这使得混合解决方案的整体效率非常高。与现有的电磁建模方法相比，该方法具有在小型计算平台（如台式机和笔记本电脑）上对汽车和飞机在大频率范围内进行高效、准确和可靠的电磁建模的独特特点。广泛的新知识将开发和系统化的汽车和飞机的电磁建模方法，从实际直流到高频应用。新的MoM-PO技术的实验验证将在新的UMass Dartmouth（先进技术和制造中心）天线和无线实验室进行测量。

0115756NotarosThe central goal of the proposed research is the development of the methodology and necessary knowledge for electromagnetic modeling of cars and aircraft over a very wide range of radio and microwave frequencies. Analysis of vehicles as electromagnetic structures (antennas and scatterers) and parts of wireless communication and radar systems is, by all means, one of the most challenging and practically important problems of applied electro-magnetics and one of the mainstream tasks with highest preference, today and in the future, of the computational electromagnetics (CEM) community. A new unified general, highly efficient and accurate, hybrid large-domain (higher-order expansion) current-based method will be developed for analysis of electrically small, medium, and very large 3D electromagnetic structures consisting of metallic and dielectric parts of arbitrary shapes. Theoretical foundation of the method is a system of coupled surface integral equations for equivalent surface electric and magnetic currents. The system will be solved by the method of moments (MoM) which will be hybridized with high-frequency asymptotic techniques based on the physical optics (PO). This hybridization will provide a smooth transition between low and high frequency applications. Within the new MoM-PO method, all the surfaces in the system (metallic and dielectric surfaces, in both the MoM- and PO-regions) will be approximated by electrically relatively large bilinear quadrilateral surface elements (large domains) with higher-order polynomial vector expansions for currents. Wires will also be incorporated, in the MoM-regions. Various corrections in the PO-regions will be introduced, including an iterative improvement of the interaction between the MoM- and PO-regions. Most importantly, the memory requirements and computation time associated with the unknowns in the PO-regions can be made extremely low, which results in an enormous overall efficiency of the hybrid solution. As compared with the existing CEM methods, the proposed method will have a unique feature of efficient, accurate, and reliable electromagnetic modeling of cars and aircraft in a wide range of frequencies on small computing platforms (such as desktop and laptop PC's). An extensive new knowledge will be developed and systematized on the methodology of electromagnetic modeling of cars and aircraft from practically dc to high-frequency applications. Experimental validation of the new MoM-PO technique will be performed by measurements in the new UMass Dartmouth ATMC (Advanced Technology and Manufacturing Center) Antenna and Wireless Laboratory.