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

大域混合矩法-物理光学技术，用于在宽频率范围内对汽车和飞机进行高效准确的电磁建模

• 批准号: 0115756
• 负责人: Branislav Notaros
• 金额: $ 18万
• 依托单位: University of Massachusetts, Dartmouth
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-09-01 至 2005-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0115756&HistoricalAwards=false
• 关键词: Large; Domain; Hybrid; Moment; Method

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.

0115756注意拟议研究的中心目标是开发在非常宽的无线电和微波频率范围内对汽车和飞机进行电磁建模的方法和必要的知识。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部件进行分析，无疑是应用电磁学中最具挑战性和实际意义的问题之一，也是当前和未来计算电磁学(CEM)界最优先考虑的主流任务之一。发展了一种新的统一、通用、高效、精确的混合大域(高阶展开)电流基方法，用于分析由任意形状的金属和介质组成的电小、中、超大型三维电磁结构。该方法的理论基础是求解等效表面电流和磁流的耦合表面积分方程组。该系统将用矩量法(MOM)求解，并与基于物理光学(PO)的高频渐近技术相结合。这种杂交将提供低频和高频应用之间的平稳过渡。在新的MOM-PO方法中，系统中的所有表面(包括MOM区和PO区的金属表面和电介质表面)将由电学上相对较大的双线性四边形表面单元(大区域)来近似，并且具有电流的高次多项式向量展开式。在MOM地区，也将纳入电线。将在PO区域中引入各种校正，包括迭代改进MOM和PO区域之间的相互作用。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变得非常低，这导致了混合解决方案的巨大整体效率。与现有的CEM方法相比，该方法具有高效、准确、可靠的特点，可以在小型计算平台(如台式机和笔记本电脑)上对多种频率的汽车和飞机进行电磁建模。将开发和系统化汽车和飞机的电磁建模方法的广泛的新知识，从实际的直流到高频应用。新MOM-PO技术的实验验证将在新的马萨诸塞州达特茅斯ATMC(先进技术和制造中心)天线和无线实验室进行测量。