Pub Date : 2015-03-05DOI: 10.1109/COMPEM.2015.7052607
Jun Yan, Jun Hu, Z. Nie
A practical shadowing test technique for the trimmed NURBS surface (TNS) is presented in this work. By employing an efficient Bezier patch classification algorithm, a two-level hierarchical space partitioning volume (HSPV) is built for the TNS, where the leaves of the HSPV that contains trimmed off part of the original surface are marked out, making sure the shadowing test occurs on the effective part of the original surface. The numerical example demonstrates the effectiveness of the proposed method.
{"title":"Practical shadowing test for PO integral on trimmed NURBS surfaces","authors":"Jun Yan, Jun Hu, Z. Nie","doi":"10.1109/COMPEM.2015.7052607","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052607","url":null,"abstract":"A practical shadowing test technique for the trimmed NURBS surface (TNS) is presented in this work. By employing an efficient Bezier patch classification algorithm, a two-level hierarchical space partitioning volume (HSPV) is built for the TNS, where the leaves of the HSPV that contains trimmed off part of the original surface are marked out, making sure the shadowing test occurs on the effective part of the original surface. The numerical example demonstrates the effectiveness of the proposed method.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"154 1","pages":"206-208"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74391387","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.2015.7052633
Wen Duan, Xiu Yin Zhang, Y. Pan
In this paper, a compact differential-fed antenna with filtering responses is proposed. The antenna is composed of two radiating patches and a differential-fed circuit embedded with two u-shape slots which generate two notches. The stacked patch is employed to further improve the impedance bandwidth to fit the LTE communication application. The proposed antenna achieves the 18% impedance bandwidth. The average gain within the bandwidth is 9.5 dBi with less than 0.5 dB variation. The cross polarization ratio is less than 30dB. Out of the operating band, the gain drops sharply, exhibiting a bandpass response.
{"title":"Compact differential-fed antenna with filtering response","authors":"Wen Duan, Xiu Yin Zhang, Y. Pan","doi":"10.1109/COMPEM.2015.7052633","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052633","url":null,"abstract":"In this paper, a compact differential-fed antenna with filtering responses is proposed. The antenna is composed of two radiating patches and a differential-fed circuit embedded with two u-shape slots which generate two notches. The stacked patch is employed to further improve the impedance bandwidth to fit the LTE communication application. The proposed antenna achieves the 18% impedance bandwidth. The average gain within the bandwidth is 9.5 dBi with less than 0.5 dB variation. The cross polarization ratio is less than 30dB. Out of the operating band, the gain drops sharply, exhibiting a bandpass response.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"21 1","pages":"278-280"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72598506","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.2015.7052540
B. A. Zeb, K. Esselle, R. Hashmi
Since the pioneering work of Von Trentini in 1956, significant improvements in the performance of electromagnetic band gap resonator antennas (ERA) have been made. The focus of this paper is on the computational models and computational efficiency related to the enhancement of 3-dB directivity bandwidth of such antennas. We explore to what extent the two unit-cell numerical electromagnetic models, Superstructure Model and Defect-Cavity Model, can be efficiently used to reduce the computation burden of the design process to achieve the best antenna bandwidth. It was found that they are very useful for antennas with medium or large superstructure areas but for smaller antennas that have much wider bandwidths numerical analysis of the whole antenna is required to achieve the best directivity bandwidth.
{"title":"Computational models for bandwidth enhancement of electromagnetic bandgap (EBG) resonator antennas and their limitations","authors":"B. A. Zeb, K. Esselle, R. Hashmi","doi":"10.1109/COMPEM.2015.7052540","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052540","url":null,"abstract":"Since the pioneering work of Von Trentini in 1956, significant improvements in the performance of electromagnetic band gap resonator antennas (ERA) have been made. The focus of this paper is on the computational models and computational efficiency related to the enhancement of 3-dB directivity bandwidth of such antennas. We explore to what extent the two unit-cell numerical electromagnetic models, Superstructure Model and Defect-Cavity Model, can be efficiently used to reduce the computation burden of the design process to achieve the best antenna bandwidth. It was found that they are very useful for antennas with medium or large superstructure areas but for smaller antennas that have much wider bandwidths numerical analysis of the whole antenna is required to achieve the best directivity bandwidth.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"349 1","pages":"19-21"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84866337","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.2015.7052544
T. Sarkar, M. S. Palma
A new boundary integral method for solving the general Helmholtz equation has been developed starting from the frequency independent Laplace's equation. The new formulation is based on the Method of Moments solution of Laplace's equation. The main feature of this new formulation is that the boundary conditions are satisfied independent of the region node discretizations. The numerical solution of the present method is compared with finite difference and finite element solutions.
{"title":"Solution of helmholtz equation starting with the frequency independent Laplace's equation","authors":"T. Sarkar, M. S. Palma","doi":"10.1109/COMPEM.2015.7052544","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052544","url":null,"abstract":"A new boundary integral method for solving the general Helmholtz equation has been developed starting from the frequency independent Laplace's equation. The new formulation is based on the Method of Moments solution of Laplace's equation. The main feature of this new formulation is that the boundary conditions are satisfied independent of the region node discretizations. The numerical solution of the present method is compared with finite difference and finite element solutions.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"290 1","pages":"30-32"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77154234","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.2015.7052595
Hong-Wei Gao, Ming-lin Yang, Gao Guo, X. Sheng
A non-conformal domain decomposition algorithm (DDA) of the hybrid finite element-boundary integral-multilevel fast multipole algorithm (FE-BI-MLFMA) is presented for computing electromagnetic scattering/radiation problems. The numerical performance of the presented non-conformal DDA-FE-BI-MLFMA is investigated for scattering/radiation problems comparing with its conformal version. Furthermore, a preconditioner is constructed to further accelerate convergence speed of this non-conformal DDA.
{"title":"A non-conformal domain decomposition algorithm of FE-BI-MLFMA for 3-D electromagnetic scattering/radiation problems","authors":"Hong-Wei Gao, Ming-lin Yang, Gao Guo, X. Sheng","doi":"10.1109/COMPEM.2015.7052595","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052595","url":null,"abstract":"A non-conformal domain decomposition algorithm (DDA) of the hybrid finite element-boundary integral-multilevel fast multipole algorithm (FE-BI-MLFMA) is presented for computing electromagnetic scattering/radiation problems. The numerical performance of the presented non-conformal DDA-FE-BI-MLFMA is investigated for scattering/radiation problems comparing with its conformal version. Furthermore, a preconditioner is constructed to further accelerate convergence speed of this non-conformal DDA.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"600 1","pages":"172-174"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77248034","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.2015.7052631
H. Yi, S. Qu, C. Chan
Reflectarray is one of the most suitable options for terahertz (THz) frequency applications, because it can realize high gain with low feed loss. However, conventional metallic reflectarray suffer from significant energy dissipation in metals and dielectric losses in the THz frequency band. To overcome those limitations, a dielectric resonator reflectarray is proposed in this paper. The reflectarray is composed of rectangular columns element with high-resistivity silicon. A multi-frequency phase-matching method is employed in the design, and the simulated results show that the reflectarray has high aperture efficiency and a wide 1-dB gain bandwidth.
{"title":"Wideband dielectric resonator terahertz reflectarray","authors":"H. Yi, S. Qu, C. Chan","doi":"10.1109/COMPEM.2015.7052631","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052631","url":null,"abstract":"Reflectarray is one of the most suitable options for terahertz (THz) frequency applications, because it can realize high gain with low feed loss. However, conventional metallic reflectarray suffer from significant energy dissipation in metals and dielectric losses in the THz frequency band. To overcome those limitations, a dielectric resonator reflectarray is proposed in this paper. The reflectarray is composed of rectangular columns element with high-resistivity silicon. A multi-frequency phase-matching method is employed in the design, and the simulated results show that the reflectarray has high aperture efficiency and a wide 1-dB gain bandwidth.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"1 1","pages":"273-274"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87531266","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.2015.7052624
Jian Wang, W. Yin, Zhufei Chu
A high-order dielectric conformal technique based on the modified finite difference time domain (FDTD) method has been proposed in this paper to predict the specific absorption rate (SAR) distribution of a human body model illuminated by some typical radar sources on ship platforms. The conformal technique introduces an effective dielectric constant and a new conductivity derived by linear average of different dielectric regions in nine spatial discrete cells to modify the update equations of FDTD method. Furthermore, the effects of incident radar signals with different incident angles and polarizations on the SAR distribution are characterized in detail and the simulation results also show that our method has good accuracy and computing efficiency compared with the traditional methods.
{"title":"The efficient prediction technique of SAR based on a modified FDTD method","authors":"Jian Wang, W. Yin, Zhufei Chu","doi":"10.1109/COMPEM.2015.7052624","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052624","url":null,"abstract":"A high-order dielectric conformal technique based on the modified finite difference time domain (FDTD) method has been proposed in this paper to predict the specific absorption rate (SAR) distribution of a human body model illuminated by some typical radar sources on ship platforms. The conformal technique introduces an effective dielectric constant and a new conductivity derived by linear average of different dielectric regions in nine spatial discrete cells to modify the update equations of FDTD method. Furthermore, the effects of incident radar signals with different incident angles and polarizations on the SAR distribution are characterized in detail and the simulation results also show that our method has good accuracy and computing efficiency compared with the traditional methods.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"73 1","pages":"253-255"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88332846","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.2015.7052537
D. García-Doñoro, Ignacio Martinez-Fernandez, L. García-Castillo, M. Salazar-Palma
This document presents a new electromagnetic in-house parallel EM simulator named HOFEM (Higher Order Finite Element Method). The simulator makes use of some of the research developments on the area made within the Group of Radiofrequency, Electromagnetism, Microwaves and Antennas (GREMA) of the Universidad Carlos III de Madrid to which the authors belong to. HOFEM makes use of a weak formulation based on double curl vector wave equation discretized with the higher-order isoparametric curl-conforming tetrahedral (and prisms) finite element rigorous implementations of Nédélec's first family of elements. A non-standard mesh truncation technique, FE-IIEE (Finite Element - Iterative Integral Equation Evaluation) for open region problems provides an arbitrarily exact absorbing boundary condition while retaining the original sparse structure of the FEM matrices. The simulator provides a multi-platform (Linux & Windows) user friendly graphical user interface. Remote job submission to HPC clusters is supported by integrating an in-house software tool developed for this purpose.
{"title":"HOFEM: A higher order finite element method electromagnetic simulator","authors":"D. García-Doñoro, Ignacio Martinez-Fernandez, L. García-Castillo, M. Salazar-Palma","doi":"10.1109/COMPEM.2015.7052537","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052537","url":null,"abstract":"This document presents a new electromagnetic in-house parallel EM simulator named HOFEM (Higher Order Finite Element Method). The simulator makes use of some of the research developments on the area made within the Group of Radiofrequency, Electromagnetism, Microwaves and Antennas (GREMA) of the Universidad Carlos III de Madrid to which the authors belong to. HOFEM makes use of a weak formulation based on double curl vector wave equation discretized with the higher-order isoparametric curl-conforming tetrahedral (and prisms) finite element rigorous implementations of Nédélec's first family of elements. A non-standard mesh truncation technique, FE-IIEE (Finite Element - Iterative Integral Equation Evaluation) for open region problems provides an arbitrarily exact absorbing boundary condition while retaining the original sparse structure of the FEM matrices. The simulator provides a multi-platform (Linux & Windows) user friendly graphical user interface. Remote job submission to HPC clusters is supported by integrating an in-house software tool developed for this purpose.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"17 1","pages":"10-12"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90437882","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.2015.7052664
S. Chai, Li-xin Guo
A new approach conjugating the compressive sensing (CS) and the Method of Moments (MoM) is proposed and validated in this paper for fast analyzing the monostatic scattering problems. The nonuniform rational B-spline (NURBS) is introduced to MoM for the purpose of reducing the unknowns in the electric field integral equation (EFIE). Meanwhile, the CS theory is utilized to decrease the sampling rate of the incident angles in wide-angle scattering problems. The accuracy and efficiency of the proposed approach are shown by comparing with the traditional MoM using Rao-Wilton-Glisson (RWG) basis function.
{"title":"A new approach based on compressive sensing for solving monostatic scattering from 3D conducting bodies modeled by NURBS surface","authors":"S. Chai, Li-xin Guo","doi":"10.1109/COMPEM.2015.7052664","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052664","url":null,"abstract":"A new approach conjugating the compressive sensing (CS) and the Method of Moments (MoM) is proposed and validated in this paper for fast analyzing the monostatic scattering problems. The nonuniform rational B-spline (NURBS) is introduced to MoM for the purpose of reducing the unknowns in the electric field integral equation (EFIE). Meanwhile, the CS theory is utilized to decrease the sampling rate of the incident angles in wide-angle scattering problems. The accuracy and efficiency of the proposed approach are shown by comparing with the traditional MoM using Rao-Wilton-Glisson (RWG) basis function.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"124 1 1","pages":"366-368"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78401896","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.2015.7052541
H. Abbas, J. Shin, R. Nevels
We review a series of electromagnetic field propagator expressions and their numerical solutions. These include propagators arising from a spectral-frequency domain scalar Helmholtz equation solution evaluated by a Fast Fourier transform numerical method, a full wave vector spectral-spatial domain expression solved by an implicit Fourier transform method, and a full wave time domain tensor field expression solved by an explicit integration technique. It is shown that the tensor field explicit integration method has some computational and accuracy advantages over differential equation finite difference methods.
{"title":"Numerical techniques for evaluating electromagnetic field propagators","authors":"H. Abbas, J. Shin, R. Nevels","doi":"10.1109/COMPEM.2015.7052541","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052541","url":null,"abstract":"We review a series of electromagnetic field propagator expressions and their numerical solutions. These include propagators arising from a spectral-frequency domain scalar Helmholtz equation solution evaluated by a Fast Fourier transform numerical method, a full wave vector spectral-spatial domain expression solved by an implicit Fourier transform method, and a full wave time domain tensor field expression solved by an explicit integration technique. It is shown that the tensor field explicit integration method has some computational and accuracy advantages over differential equation finite difference methods.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"11 1","pages":"22-23"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84332973","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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