Pub Date : 2015-03-05DOI: 10.1109/COMPEM.2015.7052603
Shang Xiang, Canping Zhu, Jinpeng Fang, G. Xiao, Junfa Mao
In this paper, a hybrid method of generalized transition matrix (GTM) and local physical optics (PO) is proposed. The GTM of a scatterer is defined uniquely to describe the relationship between the out-going fields and the incident fields on a specified reference surface. The PO algorithm is applied to obtain current distribution on the electrically large platform. Due to the locality principle, Fresnel zone is determined to reduce the unknowns on the platform analyzed by PO method. The computational efficiency can be improved comparing with conventional method. Numerical examples will be shown to demonstrate the feasibility of the hybrid method.
{"title":"Application of GTM method combined with local-PO algorithm","authors":"Shang Xiang, Canping Zhu, Jinpeng Fang, G. Xiao, Junfa Mao","doi":"10.1109/COMPEM.2015.7052603","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052603","url":null,"abstract":"In this paper, a hybrid method of generalized transition matrix (GTM) and local physical optics (PO) is proposed. The GTM of a scatterer is defined uniquely to describe the relationship between the out-going fields and the incident fields on a specified reference surface. The PO algorithm is applied to obtain current distribution on the electrically large platform. Due to the locality principle, Fresnel zone is determined to reduce the unknowns on the platform analyzed by PO method. The computational efficiency can be improved comparing with conventional method. Numerical examples will be shown to demonstrate the feasibility of the hybrid method.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"102 1","pages":"195-196"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79516048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-05DOI: 10.1109/COMPEM.2015.7052652
J. T. Vásquez, A. Francavilla, F. Vipiana, G. Vecchi, Z. Peng, Jin-Fa Lee
This work describes an automatic tool able to estimate the error in the Integral Equation solution in order to refine the mesh where the error is higher than the chosen threshold. The local refinement is performed through a hierarchical dyadic subdivision on the selected triangles to reach the desired error. As the resulting mesh is non-conformal, a Discontinous Galerkin scheme is applied.
{"title":"Automatic h-refinement through a-posteriori error estimation and discontinous Galerkin","authors":"J. T. Vásquez, A. Francavilla, F. Vipiana, G. Vecchi, Z. Peng, Jin-Fa Lee","doi":"10.1109/COMPEM.2015.7052652","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052652","url":null,"abstract":"This work describes an automatic tool able to estimate the error in the Integral Equation solution in order to refine the mesh where the error is higher than the chosen threshold. The local refinement is performed through a hierarchical dyadic subdivision on the selected triangles to reach the desired error. As the resulting mesh is non-conformal, a Discontinous Galerkin scheme is applied.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"68 1","pages":"333-334"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73908468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-05DOI: 10.1109/COMPEM.2015.7052560
E. Motovilova, Jiasheng Su, S. Huang
This article presents and compares analytical and numerical methods for electrical property retrievals that are developed recently in our research group. The methods create electrical property maps of human body only on the basis of typical data from magnetic resonance imaging (MRI) (without using any additional devises or data). Derivations and results are included. Analysis and comparison of the methods are presented.
{"title":"MRI-based electrical property mapping for human body","authors":"E. Motovilova, Jiasheng Su, S. Huang","doi":"10.1109/COMPEM.2015.7052560","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052560","url":null,"abstract":"This article presents and compares analytical and numerical methods for electrical property retrievals that are developed recently in our research group. The methods create electrical property maps of human body only on the basis of typical data from magnetic resonance imaging (MRI) (without using any additional devises or data). Derivations and results are included. Analysis and comparison of the methods are presented.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"34 1","pages":"73-75"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73964681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-05DOI: 10.1109/COMPEM.2015.7052589
Dongying Li, E. Li, Min Zhang, Wenxian Yu
A brief introduction of transmission line models of three-dimensional metal-insulator-metal plasmonic waveguides is given, along with which is the parasitic circuit model for plasmonic waveguide T junctions. With these analytical means, an equivalent circuit model of a teeth-shape filter is given, and its accuracy is validated by comparison to the result of full-wave solvers.
{"title":"Equivalent circuit models of a lossy MIM multiple teeth-shape filter","authors":"Dongying Li, E. Li, Min Zhang, Wenxian Yu","doi":"10.1109/COMPEM.2015.7052589","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052589","url":null,"abstract":"A brief introduction of transmission line models of three-dimensional metal-insulator-metal plasmonic waveguides is given, along with which is the parasitic circuit model for plasmonic waveguide T junctions. With these analytical means, an equivalent circuit model of a teeth-shape filter is given, and its accuracy is validated by comparison to the result of full-wave solvers.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"313 1","pages":"156-157"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73234054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-05DOI: 10.1109/COMPEM.2015.7052606
Song Fu, Yunhua Zhang, Siyuan He, G. Zhu
An accurate and efficient numerical algorithm is presented for creeping ray tracing on the arbitrarily shaped surfaces modeled by the Non-Uniform Rational B-spline (NURBS) surfaces. The main problem in calculating the UTD surface diffracted fields on NURBS surfaces is due to the difficulty in determining the geodesic paths which the creeping rays propagate along. In this paper, an efficient method is developed based on the property of geodesic to compute geodesic paths on NURBS surfaces. And the algorithm can extend the applicability of UTD for practical engineering. The validity and efficiency of the algorithm is verified by numerical results.
{"title":"Surface-ray tracing based on the property of geodesic on arbitrary NURBS surfaces","authors":"Song Fu, Yunhua Zhang, Siyuan He, G. Zhu","doi":"10.1109/COMPEM.2015.7052606","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052606","url":null,"abstract":"An accurate and efficient numerical algorithm is presented for creeping ray tracing on the arbitrarily shaped surfaces modeled by the Non-Uniform Rational B-spline (NURBS) surfaces. The main problem in calculating the UTD surface diffracted fields on NURBS surfaces is due to the difficulty in determining the geodesic paths which the creeping rays propagate along. In this paper, an efficient method is developed based on the property of geodesic to compute geodesic paths on NURBS surfaces. And the algorithm can extend the applicability of UTD for practical engineering. The validity and efficiency of the algorithm is verified by numerical results.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"100 1","pages":"203-205"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85791088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-05DOI: 10.1109/COMPEM.2015.7052587
Lei Zhu, Sheng Sun
This paper presents a brief review on the development of numerical calibration and de-embedding techniques. The earlier proposed short-open-calibration (SOC) technique was first implemented in the integral-equation based method of moments and extensively studied for computer-aided design of different microwave circuit structures. Unlike other de-embedding techniques, the SOC technique has no need to predefine the port discontinuities and feed network, but only consider them as a unified error box. Recent progress in this research will be discussed and clarified.
{"title":"A review on numerical calibration and de-embedding techniques in full-wave algorithms","authors":"Lei Zhu, Sheng Sun","doi":"10.1109/COMPEM.2015.7052587","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052587","url":null,"abstract":"This paper presents a brief review on the development of numerical calibration and de-embedding techniques. The earlier proposed short-open-calibration (SOC) technique was first implemented in the integral-equation based method of moments and extensively studied for computer-aided design of different microwave circuit structures. Unlike other de-embedding techniques, the SOC technique has no need to predefine the port discontinuities and feed network, but only consider them as a unified error box. Recent progress in this research will be discussed and clarified.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"23 1","pages":"150-152"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79309674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-05DOI: 10.1109/COMPEM.2015.7052665
Chunbei Luo, Yong Zhang, Hai Lin
A comparative study on different singularity extraction techniques of Electric Field Integral Equation (EFIE) is presented Three types of methods which are the Duffy transform, projection integration and the analytic integration are implemented and compared Numerical results show the differences in the efficiency, memory usage and the accuracy of three methods. Furthermore, the best choice of the different methods is recommended for dealing with singularity when mesh sizes are different.
{"title":"A comparative study on different singularity extraction techniques of EFIE","authors":"Chunbei Luo, Yong Zhang, Hai Lin","doi":"10.1109/COMPEM.2015.7052665","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052665","url":null,"abstract":"A comparative study on different singularity extraction techniques of Electric Field Integral Equation (EFIE) is presented Three types of methods which are the Duffy transform, projection integration and the analytic integration are implemented and compared Numerical results show the differences in the efficiency, memory usage and the accuracy of three methods. Furthermore, the best choice of the different methods is recommended for dealing with singularity when mesh sizes are different.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"37 1","pages":"369-370"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81941366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-05DOI: 10.1109/COMPEM.2015.7052545
Wei E. I. Liu, Zhi Ning Chen, X. Qing
A type of metamaterial-based center-fed mushroom antenna is proposed for low-profile broadband antenna design. The mushroom structure is used as the radiating element and aperture coupled beneath the radiators. Unique dual resonant modes are simultaneously excited for broadside radiation. The proposed antenna design methodology has been successfully applied in antenna and array designs for 5-GHz WLAN and 60-GHz WPAN applications.
{"title":"Low-profile broadband antennas using metamaterial-mushroom structures (invited)","authors":"Wei E. I. Liu, Zhi Ning Chen, X. Qing","doi":"10.1109/COMPEM.2015.7052545","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052545","url":null,"abstract":"A type of metamaterial-based center-fed mushroom antenna is proposed for low-profile broadband antenna design. The mushroom structure is used as the radiating element and aperture coupled beneath the radiators. Unique dual resonant modes are simultaneously excited for broadside radiation. The proposed antenna design methodology has been successfully applied in antenna and array designs for 5-GHz WLAN and 60-GHz WPAN applications.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"33 6 1","pages":"33-34"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81175398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-05DOI: 10.1109/COMPEM.2015.7052591
Kwok Kee Chan
A modal analysis method and a design approach for a compact broadband dual polarized end-launched coaxial transition into a dielectric-filled square waveguide are presented in this paper.
本文提出了一种紧凑宽带双极化端发射同轴跃迁到介电填充方形波导的模态分析方法和设计方法。
{"title":"Broadband dual polarized end-launched coaxial transition for dielectric-filled square waveguide","authors":"Kwok Kee Chan","doi":"10.1109/COMPEM.2015.7052591","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052591","url":null,"abstract":"A modal analysis method and a design approach for a compact broadband dual polarized end-launched coaxial transition into a dielectric-filled square waveguide are presented in this paper.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"45 1","pages":"161-163"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89036601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-05DOI: 10.1109/COMPEM.2015.7052534
R. Mittra
Computational Electromagnetics (CEM) has made great strides over the years and has enabled us to solve very large and complex problems that were well beyond our reach only a few year ago. This has been made possible because of steady increases in computing speeds - thanks to Moor's Law - and the advent of parallelization as well as development of iterative and domain decomposition techniques. The quest as well as progress toward the solution of very large and complex problems remain unabated - CEM problems involving "billions and billions" of unknowns are being routinely solved today - and this trend is likely to continue for a long time to come. The focus of this presentation is not on proposing yet another algorithm which would help us solve even larger problems than we can handle today, but on discussing alternate ways by which we can enhance the performance of microwave devices - such as imaging systems and lenses - by combining signal processing algorithms with CEM. The paper will discuss several examples of performance enhancement including sub-wavelength imaging of objects that are not located in the near fields of lenses, and improving the accuracy of direction finding antenna systems with size constraints that limit their limitation if conventional DF techniques are used. Our strategy is to first use available CEM techniques to solve the forward problems efficiently and then to use these solutions in Signal Processing algorithms for the purpose of performance enhancement of microwave devices of the type mentioned above.
{"title":"Keynote speaker 2: Combining computational electromagnetics with signal processing algorithms to enhance the performance of imaging devices and antennas","authors":"R. Mittra","doi":"10.1109/COMPEM.2015.7052534","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052534","url":null,"abstract":"Computational Electromagnetics (CEM) has made great strides over the years and has enabled us to solve very large and complex problems that were well beyond our reach only a few year ago. This has been made possible because of steady increases in computing speeds - thanks to Moor's Law - and the advent of parallelization as well as development of iterative and domain decomposition techniques. The quest as well as progress toward the solution of very large and complex problems remain unabated - CEM problems involving \"billions and billions\" of unknowns are being routinely solved today - and this trend is likely to continue for a long time to come. The focus of this presentation is not on proposing yet another algorithm which would help us solve even larger problems than we can handle today, but on discussing alternate ways by which we can enhance the performance of microwave devices - such as imaging systems and lenses - by combining signal processing algorithms with CEM. The paper will discuss several examples of performance enhancement including sub-wavelength imaging of objects that are not located in the near fields of lenses, and improving the accuracy of direction finding antenna systems with size constraints that limit their limitation if conventional DF techniques are used. Our strategy is to first use available CEM techniques to solve the forward problems efficiently and then to use these solutions in Signal Processing algorithms for the purpose of performance enhancement of microwave devices of the type mentioned above.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"5 1","pages":"3-4"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78926197","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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