Higher-Order Finite Element-Moment Method Modeling Techniques for Conformal Antenna Applications

建议研究的中心目标是开发一种新的、高效和精确的、混合的高阶计算电磁学(CEM)方法，用于共形天线的建模、分析和设计。与传统的凸形天线相比，共形天线具有重量轻、阻力小、成本低、隐蔽性好、灵活性大等优点。发展了一种新的高阶有限元方法和一种新的高阶矩量法，并将这两种方法杂交成一种功能强大的高阶有限元-矩量法。建模技术将使用更高几何阶数的广义六面体有限元和广义四边形边界元，并结合更高阶场/流基函数。对于自由空间或无界均匀介质，新的矩量法将使用格林函数的表面积分方程式，从而避免使用并矢格林函数(对于正则几何)。新的有限元-矩量法将能够对具有任意材料复杂性的腔背共形天线进行建模，这些共形天线与任意(正则和非正则)形状的平台共形，并且可能具有材料覆盖。在项目的最后阶段，有限元-MOM将与物理光学(PO)方法相结合，这将使在非常大的平台上高效地建模共形天线成为可能。最后，用新的有限元-MOM-PO方法对车载共形贴片和缝隙背腔天线进行了分析。新模拟技术的实验验证将在马萨诸塞大学达特茅斯大学新成立的先进技术和制造中心(ATMC)内的新成立的电信(天线)实验室进行。这项建议的所有教育方面都与拟议的研究完全结合。两名博士研究生将作为研究助理参与该项目，并由这笔拟议拨款支持，为期三年。其他一些研究生和本科生将定期参与该项目，完成课程项目和研讨会。这项拟议的CEM研究的结果将在项目的所有阶段广泛传播。由于共形天线在现代无线系统中具有重要的实用价值，因此它在建模和表征方面的应用也引起了人们的广泛兴趣。这项研究的结果可能会对其他研究人员在CEM以及其他科学和工程计算学科的工作中，在有限元和MOM(或边界元方法)的应用中有所帮助。将尽一切可能扩大任职人数不足的群体对拟议活动的参与。

0324345NotarosThe central goal of the proposed research is the development of a new, highly efficient and accurate, hybrid higher-order computational electromagnetics (CEM) method for modeling, analysis, and design of conformal antennas. Conformal antennas have many advantages over traditional protruding antennas because of their low weight, low drag, low cost, unobtrusive nature, and great flexibility. A new higher-order finite element method (FEM) and a new higher-order method of moments (MoM) will be developed, and the two methods will be hybridized into a higher-order FEM-MoM method of great capabilities. The modeling techniques will use generalized hexahedral finite elements and generalized quadrilateral boundary elements of higher geometrical orders in conjunction with higher-order hierarchical field/current basis functions. The new MoM will employ the surface integral equation formulation using Green's functions for free-space or unbounded homogeneous media, thus avoiding use of the dyadic Green's function (for canonical geometries). The new FEM-MoM method will enable modeling of cavity-backed conformal antennas with arbitrary material complexities that are conformal to platforms of arbitrary (canonical and noncanonical) shapes and with possible material overlays. In the final stage of the project, FEM-MoM will be hybridized with the physical optics (PO) method, which will enable efficient modeling of conformal antennas on very large platforms. Finally, conformal patch and slot cavity-backed antennas on vehicles will be analyzed by the new FEM-MoM-PO method. Experimental validation of the new simulation techniques will be carried out in the newly established Telecommunications (Antenna) Laboratory within the new Advanced Technology and Manufacturing Center (ATMC) at the University of Massachusetts Dartmouth. All educational aspects of this proposal are fully integrated with the proposed research. Two Ph.D. graduate students will work on the project as research assistants supported by this proposed grant for three years. A number of other graduate and undergraduate students will be engaged in the project periodically, thorough course projects and seminars. The results of this proposed CEM research will be disseminated broadly, at all stages of the project. The application to modeling and characterization of conformal antennas is also of a broad interest, because of their great practical importance to modern wireless systems. It is likely that findings of this research will be useful to other researchers in their own endeavors in CEM, as well as in other computational disciplines of science and engineering, in both FEM and MoM (or boundary element method) applications. Every possible effort will be made to broaden the participation from underrepresented groups in the proposed activities.