PYI: Toward The Realistic Modeling of Electromagnetic Scattering Problems

PI描述了他在总统青年研究者奖下的工作如下：在制定电磁散射问题时，人们经常被迫在两个相互冲突的要求之间做出选择：严格的分析与现实的建模。在过去，人们过分强调严格的分析，而忽略了真实的建模。最近，出现了几类问题，其中几何形状对散射特性的影响是最重要的。本文主要研究两个问题：(1)部分开洞的雷达截面分析。最小化来自喷气发动机进气道的雷达回波是隐身技术的主要挑战之一。一种新的射线发射技术将被应用于分析进气内部的成形或涂层效果。(2)微带不连续的表征。在单片微波集成电路设计中，微带传输结构的精确电磁特性是必不可少的。时域有限差分方法将应用于各种不连续，以提取散射参数/电路模型对CAD工具的发展至关重要。该PYI奖将研究电磁散射的理论建模问题。重点将放在现实的建模方法，其中散射体的几何形状是最重要的。重点领域将是分析(1)部分开放腔（如喷气发动机进气道）的雷达横截面，以及(2)在开发单片微波集成电路的计算机辅助设计工具中具有重要意义的微带不连续特性。

The PI describes his work under the Presidential Young Investigators award as follows: In formulating electromagnetic scattering problems, one is often forced to choose between tow conflicting requirements: rigorous analysis vs. realistic modelling. In the past, much emphasis has been placed on the rigorous analysis at the expense of realistic modelling. More recently, several classes of problems have arisen in which the effect of the geometry on the scattering characteristics is of prime importance. Two such problems will be addressed in this study: (1) Radar cross section analysis of partially open cavities. Minimizing radar returns from jet engine intakes is one of the major challenges in stealth technology. A novel ray launching technique will be applied to analyze the effect of shaping or coating the intake interior. (2) Characterization of microstrip discontinuities. Accurate electromagnetic characterization of microstrip transmission structures is essential in the design of monolithic microwave integrated circuits. A time-domain finite- difference approach will be applied to various discontinuities in order to extract scattering parameters/circuit models crucial to the development of CAD tools. This PYI award will study theoretical modelling problems in electromagnetic scattering. The emphasis will be on realistic modelling approaches in which the geometry of the scatterer is of prime importance. Areas of emphasis will be on analysis of (1) radar cross sections for partially open cavities such as in jet engine intakes, and (2) characterizations of microstrip discontinuities which are of importance in developing computer aided design tools for monolithic microwave integrated circuits.