Pub Date : 2015-03-05DOI: 10.1109/COMPEM.2015.7052561
Y. Cui, Deqiang Yang, Huiling Zeng, Meng Zou, Jin Pan
A double-sided printed bow-tie antenna array fed by balanced Schiffman phase shifter, which used as a reader antenna in ultra-wideband (UWB) location system, is proposed in this paper. The presented antenna has a impedance bandwidth of 3.4-4.4 GHz and a high gain of more than 5dB within the whole bandwidth. Good omnidirectional radiation pattern is obtained in the plane of θ = 15°. Good simulation results are achieved by HFSS.
{"title":"A printed antenna array fed by balanced Schiffman shifter used for UWB location system","authors":"Y. Cui, Deqiang Yang, Huiling Zeng, Meng Zou, Jin Pan","doi":"10.1109/COMPEM.2015.7052561","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052561","url":null,"abstract":"A double-sided printed bow-tie antenna array fed by balanced Schiffman phase shifter, which used as a reader antenna in ultra-wideband (UWB) location system, is proposed in this paper. The presented antenna has a impedance bandwidth of 3.4-4.4 GHz and a high gain of more than 5dB within the whole bandwidth. Good omnidirectional radiation pattern is obtained in the plane of θ = 15°. Good simulation results are achieved by HFSS.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"48 1","pages":"76-78"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91049095","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.2015.7052630
J. Shi, X. Zhang, J. Zhang, M. Tong
Lossy conductors are not perfectly electric conductors and their finite conductivity needs to be carefully accounted for in the accurate solution of electromagnetic problems. Traditionally, surface integral equations (SIEs) are used to approximately describe the problems, but we use volume integral equations (VIEs) to exactly formulate the problems by treating the lossy conductors as dielectric-like objects. The VIEs are solved by a point-matching scheme which allows the use of JM-formulation, yielding some desirable merits. Typical numerical examples are presented to demonstrate the scheme and its robustness has been verified.
{"title":"Accurate solution of volume integral equations for electromagnetic scattering by lossy conductors","authors":"J. Shi, X. Zhang, J. Zhang, M. Tong","doi":"10.1109/COMPEM.2015.7052630","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052630","url":null,"abstract":"Lossy conductors are not perfectly electric conductors and their finite conductivity needs to be carefully accounted for in the accurate solution of electromagnetic problems. Traditionally, surface integral equations (SIEs) are used to approximately describe the problems, but we use volume integral equations (VIEs) to exactly formulate the problems by treating the lossy conductors as dielectric-like objects. The VIEs are solved by a point-matching scheme which allows the use of JM-formulation, yielding some desirable merits. Typical numerical examples are presented to demonstrate the scheme and its robustness has been verified.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"19 1","pages":"270-272"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82855067","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.2015.7052611
Zhen Hu
Photonic crystal heterostructure mode-gap cavities, constructed by connecting two kinds of photonic crystal waveguides with different lattice constants, are important photonic devices. In this paper, we extend the Dirichlet-to-Neumann map method to analyze mode-gap cavities in two-dimensional photonic crystal heterostructures. The efficiency of our method is illustrated by numerical simulations.
{"title":"Analyzing photonic crystal heterostructure mode-gap cavities by Dirichlet-to-Neumann maps","authors":"Zhen Hu","doi":"10.1109/COMPEM.2015.7052611","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052611","url":null,"abstract":"Photonic crystal heterostructure mode-gap cavities, constructed by connecting two kinds of photonic crystal waveguides with different lattice constants, are important photonic devices. In this paper, we extend the Dirichlet-to-Neumann map method to analyze mode-gap cavities in two-dimensional photonic crystal heterostructures. The efficiency of our method is illustrated by numerical simulations.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"43 1","pages":"218-220"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82864208","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.2015.7052658
Yan Li, Sheng Sun, Q. Dai, W. Chew
In this paper, a solution to the double curl equation with generalized Coulomb gauge is proposed based on the vectorial representation of the magnetic vector potential. Coulomb gauge is applied to remove the null space of the curl operator and hence the uniqueness of the solution is guaranteed. However, as the divergence operator cannot act on the curl-conforming edge basis functions directly, the magnetic vector potential is used to be represented by nodal finite elements. Inspired by the mapping of Whitney forms by mathematical operators and Hodge operators, the divergence of the magnetic vector potential, as a whole, can be approximated by scalar basis functions. Hence, the magnetic vector potential can be expanded by vector basis functions, and the original equation can be rewritten in a generalized form and solved in a more natural and accurate way.
{"title":"Vectorial solution to double curl equation with generalized coulomb gauge for magneto static problems","authors":"Yan Li, Sheng Sun, Q. Dai, W. Chew","doi":"10.1109/COMPEM.2015.7052658","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052658","url":null,"abstract":"In this paper, a solution to the double curl equation with generalized Coulomb gauge is proposed based on the vectorial representation of the magnetic vector potential. Coulomb gauge is applied to remove the null space of the curl operator and hence the uniqueness of the solution is guaranteed. However, as the divergence operator cannot act on the curl-conforming edge basis functions directly, the magnetic vector potential is used to be represented by nodal finite elements. Inspired by the mapping of Whitney forms by mathematical operators and Hodge operators, the divergence of the magnetic vector potential, as a whole, can be approximated by scalar basis functions. Hence, the magnetic vector potential can be expanded by vector basis functions, and the original equation can be rewritten in a generalized form and solved in a more natural and accurate way.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"275 1","pages":"350-352"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82877762","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.2015.7052554
A. Qasim, Z. Shen
A novel three-dimensional frequency-selective structure with an ultra-wide bandstop response is proposed using a cascaded configuration of a two-dimensional array of vertically stacked parallel strip lines. The structure is designed to achieve a combined rejection response of two independently designed parallel strips etched on the same substrate material. The bandwidth and the position of the rejection band are configurable by controlling the lengths of the two cascaded parallel strips. An example design is presented with its measured result, achieving a -10 dB fractional bandwidth of 100% The structure demonstrates a stable angular response under fairly large oblique incident angles given the wide bandwidth. The operating principles and design procedures are briefly explained.
{"title":"Ultra-wide bandstop frequency selective structure using a cascaded array of vertically stacked parallel strip lines","authors":"A. Qasim, Z. Shen","doi":"10.1109/COMPEM.2015.7052554","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052554","url":null,"abstract":"A novel three-dimensional frequency-selective structure with an ultra-wide bandstop response is proposed using a cascaded configuration of a two-dimensional array of vertically stacked parallel strip lines. The structure is designed to achieve a combined rejection response of two independently designed parallel strips etched on the same substrate material. The bandwidth and the position of the rejection band are configurable by controlling the lengths of the two cascaded parallel strips. An example design is presented with its measured result, achieving a -10 dB fractional bandwidth of 100% The structure demonstrates a stable angular response under fairly large oblique incident angles given the wide bandwidth. The operating principles and design procedures are briefly explained.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"2566 1","pages":"56-58"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86586106","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.2015.7052596
M. Jiang, Jun Hu, R. Zhao, Z. Nie
This paper investigates the discontinuous Galerkin method based on surface integral equations for the simulation of the electromagnetic scattering problem from objects with impedance boundary condition (IBC). The new surface integral equation is formulated by a proper dual paring to form a reaction integral, which is able to easily simulate scattering from objects with different IBCs even from the perfect electric conductors (PEC) and the perfect magnetic conductors (PMC). Due to the discontinuous Galerkin scheme, it is possible to employ non-conformal surface discretization of the objects. In addition, the multilevel fast multipole algorithm (MLFMA) is implemented to reduce the computational complexity. Numerical examples are presented to demonstrate the performance of the proposed formulations.
{"title":"Surface integral equation based discontinuous Galerkin method for impedance surface objects","authors":"M. Jiang, Jun Hu, R. Zhao, Z. Nie","doi":"10.1109/COMPEM.2015.7052596","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052596","url":null,"abstract":"This paper investigates the discontinuous Galerkin method based on surface integral equations for the simulation of the electromagnetic scattering problem from objects with impedance boundary condition (IBC). The new surface integral equation is formulated by a proper dual paring to form a reaction integral, which is able to easily simulate scattering from objects with different IBCs even from the perfect electric conductors (PEC) and the perfect magnetic conductors (PMC). Due to the discontinuous Galerkin scheme, it is possible to employ non-conformal surface discretization of the objects. In addition, the multilevel fast multipole algorithm (MLFMA) is implemented to reduce the computational complexity. Numerical examples are presented to demonstrate the performance of the proposed formulations.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"4 1","pages":"175-177"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82191268","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.2015.7052663
Xue‐Song Yang, Lin Zhang, Li-Ling Zhou, Ruizhen Wang, Xu-Jia Li
Two compact planar UWB MIMO antennas for wireless communications are presented. The first antenna, which operates in the 2.3-12 GHz frequency band, has a size of 72 mm × 48 mm × 0.76 mm. High port-to-port isolation over the whole ultra-wideband is achieved by using an inverted-T stub between the elements. The second antenna has a size of 34 mm × 47 mm × 1.6 mm, and operates in the band from 3.8 to 11.8 GHz. Unlike other designs, the radiators are reversely parallel placed for achieving high isolation between two ports. Furthermore, an interdigital-like structure, which is composed of stubs and strips, has been employed to enhance both the isolation and the bandwidth. The current distributions, S parameters and radiation patterns of both antennas are given. The results show that, both antennas have high isolation of more than 20 dB over the ultra-wide operation bandwidth. The proposed antennas are suitable for some portable MEVIO/diversity applications.
介绍了两种用于无线通信的小型平面超宽带MIMO天线。第一个天线工作在2.3- 12ghz频段，尺寸为72mm × 48mm × 0.76 mm。整个超宽带的高端口对端口隔离是通过在元件之间使用倒t存根实现的。第二个天线尺寸为34 mm × 47 mm × 1.6 mm，工作在3.8 ~ 11.8 GHz频段。与其他设计不同，散热器是反向平行放置，以实现两个端口之间的高隔离。此外，还采用了一种由存根和条带组成的类似数字间的结构来提高隔离度和带宽。给出了两种天线的电流分布、S参数和辐射方向图。结果表明，在超宽工作带宽下，两种天线均具有超过20 dB的高隔离度。所提出的天线适用于一些便携式MEVIO/分集应用。
{"title":"Planar two-element UWB MIMO antennas with high isolations","authors":"Xue‐Song Yang, Lin Zhang, Li-Ling Zhou, Ruizhen Wang, Xu-Jia Li","doi":"10.1109/COMPEM.2015.7052663","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052663","url":null,"abstract":"Two compact planar UWB MIMO antennas for wireless communications are presented. The first antenna, which operates in the 2.3-12 GHz frequency band, has a size of 72 mm × 48 mm × 0.76 mm. High port-to-port isolation over the whole ultra-wideband is achieved by using an inverted-T stub between the elements. The second antenna has a size of 34 mm × 47 mm × 1.6 mm, and operates in the band from 3.8 to 11.8 GHz. Unlike other designs, the radiators are reversely parallel placed for achieving high isolation between two ports. Furthermore, an interdigital-like structure, which is composed of stubs and strips, has been employed to enhance both the isolation and the bandwidth. The current distributions, S parameters and radiation patterns of both antennas are given. The results show that, both antennas have high isolation of more than 20 dB over the ultra-wide operation bandwidth. The proposed antennas are suitable for some portable MEVIO/diversity applications.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"17 1","pages":"363-365"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81973778","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.2015.7052567
Anshul Gupta, R. Gangwar
Analysis of strip excited triangular shape dielectric resonator antenna (TDRA) using Finite Difference Time Domain (FDTD) numerical technique is presented. The calculated values of resonant frequencies using FDTD method have been compared with predicted resonant frequencies values using Dielectric Waveguide Method. The numerical and theoretical results are found in good agreement, which validate this analysis using FDTD numerical technique.
{"title":"Analysis of conformal strip feed triangular dielectric resonator antenna using FDTD method","authors":"Anshul Gupta, R. Gangwar","doi":"10.1109/COMPEM.2015.7052567","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052567","url":null,"abstract":"Analysis of strip excited triangular shape dielectric resonator antenna (TDRA) using Finite Difference Time Domain (FDTD) numerical technique is presented. The calculated values of resonant frequencies using FDTD method have been compared with predicted resonant frequencies values using Dielectric Waveguide Method. The numerical and theoretical results are found in good agreement, which validate this analysis using FDTD numerical technique.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"19 1","pages":"92-94"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82766419","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.2015.7052535
M. A. Moharram, A. Kishk
A simple, fast, and efficient approach to solve the electromagnetic (EM) scattering problem from arbitrary object is offered by the Random Auxiliary Sources (RAS) method. Based on direct application of the boundary conditions and projection of radiating modes with infinitesimal sources, the method is able to accurately solve problems with much less execution time than other comparable methods. The method is verified and compared to the Method of Moments (MoM) for 2D and 3D problems for accuracy and speed.
{"title":"The random auxiliary sources method: A simple, fast, and efficient electromagnetic scattering computations approach","authors":"M. A. Moharram, A. Kishk","doi":"10.1109/COMPEM.2015.7052535","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052535","url":null,"abstract":"A simple, fast, and efficient approach to solve the electromagnetic (EM) scattering problem from arbitrary object is offered by the Random Auxiliary Sources (RAS) method. Based on direct application of the boundary conditions and projection of radiating modes with infinitesimal sources, the method is able to accurately solve problems with much less execution time than other comparable methods. The method is verified and compared to the Method of Moments (MoM) for 2D and 3D problems for accuracy and speed.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"73 1","pages":"5-7"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86365488","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 : 2015-03-02DOI: 10.1109/COMPEM.2015.7052566
Guneet Kaur, A. Yılmaz
A parallel multi-level out-of-core algorithm is presented to mitigate the high memory requirement of the time-domain adaptive integral method. Numerical results demonstrate the performance of the method for large-scale simulations where terabytes of data are transferred to/from a distributed storage system.
{"title":"A parallel out-of-core algorithm for the time-domain adaptive integral method","authors":"Guneet Kaur, A. Yılmaz","doi":"10.1109/COMPEM.2015.7052566","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052566","url":null,"abstract":"A parallel multi-level out-of-core algorithm is presented to mitigate the high memory requirement of the time-domain adaptive integral method. Numerical results demonstrate the performance of the method for large-scale simulations where terabytes of data are transferred to/from a distributed storage system.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"29 1","pages":"89-91"},"PeriodicalIF":0.0,"publicationDate":"2015-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87401635","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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