{"title":"Finite Element Spectral Integral (FESI) Method for Scattering From an Arbitrary Number of Circular Cylinders With Inhomogeneous Shells","authors":"Siwei Wan;Qing Huo Liu","doi":"10.1109/TMTT.2024.3443669","DOIUrl":null,"url":null,"abstract":"The hybrid finite element spectral integral (FESI) method is developed to solve the radiation and scattering problems of multiple circular cylinders with inhomogeneous shells. The FESI method combines the spectral integral method (SIM) with the finite element method (FEM) to simulate electromagnetic (EM) scattering from inhomogeneities separated by multiple regions of homogeneous spaces. The SIM is extended to multiple circular dielectric cylinders and serves as the exact radiation boundary condition for the FEM to simulate waves in the remaining inhomogeneous regions. This approach eliminates the mesh in any homogeneous domains with circular boundaries and leads to higher efficiency than the traditional FEM. The SIM can achieve 99% accuracy with up to 90% less sampling density than the method of moments (MoM) and has exponential convergence. We present several numerical examples to demonstrate the accuracy and efficiency of the SIM and FESI method.","PeriodicalId":13272,"journal":{"name":"IEEE Transactions on Microwave Theory and Techniques","volume":"73 2","pages":"854-866"},"PeriodicalIF":4.5000,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Transactions on Microwave Theory and Techniques","FirstCategoryId":"5","ListUrlMain":"https://ieeexplore.ieee.org/document/10647219/","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
Abstract
The hybrid finite element spectral integral (FESI) method is developed to solve the radiation and scattering problems of multiple circular cylinders with inhomogeneous shells. The FESI method combines the spectral integral method (SIM) with the finite element method (FEM) to simulate electromagnetic (EM) scattering from inhomogeneities separated by multiple regions of homogeneous spaces. The SIM is extended to multiple circular dielectric cylinders and serves as the exact radiation boundary condition for the FEM to simulate waves in the remaining inhomogeneous regions. This approach eliminates the mesh in any homogeneous domains with circular boundaries and leads to higher efficiency than the traditional FEM. The SIM can achieve 99% accuracy with up to 90% less sampling density than the method of moments (MoM) and has exponential convergence. We present several numerical examples to demonstrate the accuracy and efficiency of the SIM and FESI method.
期刊介绍：
The IEEE Transactions on Microwave Theory and Techniques focuses on that part of engineering and theory associated with microwave/millimeter-wave components, devices, circuits, and systems involving the generation, modulation, demodulation, control, transmission, and detection of microwave signals. This includes scientific, technical, and industrial, activities. Microwave theory and techniques relates to electromagnetic waves usually in the frequency region between a few MHz and a THz; other spectral regions and wave types are included within the scope of the Society whenever basic microwave theory and techniques can yield useful results. Generally, this occurs in the theory of wave propagation in structures with dimensions comparable to a wavelength, and in the related techniques for analysis and design.
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