Pub Date : 2016-03-13DOI: 10.1109/ROPACES.2016.7465469
T. Mifune
In this study, an enhanced version of the recently proposed interface homogenization technique is presented. The interface homogenization technique can improve the accuracy of the finite element analysis that uses an unfitted mesh, which does not necessary fit the geometry of the analyzed objects. The new version of the technique enables the handling of anisotropic media.
{"title":"Interface homogenization technique for electro/magneto-static finite element analysis including anisotropic media","authors":"T. Mifune","doi":"10.1109/ROPACES.2016.7465469","DOIUrl":"https://doi.org/10.1109/ROPACES.2016.7465469","url":null,"abstract":"In this study, an enhanced version of the recently proposed interface homogenization technique is presented. The interface homogenization technique can improve the accuracy of the finite element analysis that uses an unfitted mesh, which does not necessary fit the geometry of the analyzed objects. The new version of the technique enables the handling of anisotropic media.","PeriodicalId":101990,"journal":{"name":"2016 IEEE/ACES International Conference on Wireless Information Technology and Systems (ICWITS) and Applied Computational Electromagnetics (ACES)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124309277","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 : 2016-03-13DOI: 10.1109/ROPACES.2016.7465344
K. Wang, M. Li, D. Ding, Z. Fan, Y. Shen, R. Chen
A hierarchical fast direct solver is proposed for the method of moment (MoM) based on the low-rank compression method. The dense impendent matrix of MoM is decomposed into a hierarchical off-diagonal low-rank (HODLR) system with the rank deficiency of the off-diagonal matrixes for far field interactions. Furthermore, the HODLR matrix can be easily expressed with a multiplication of several diagonal matrixes. Each small diagonal matrix block can be inversed easily. So that, the current solution of the integral equation can be expressed with a series of matrix vector products (MVPs) with given excitation vectors.
{"title":"A hierarchical fast direct solver for the method of moment","authors":"K. Wang, M. Li, D. Ding, Z. Fan, Y. Shen, R. Chen","doi":"10.1109/ROPACES.2016.7465344","DOIUrl":"https://doi.org/10.1109/ROPACES.2016.7465344","url":null,"abstract":"A hierarchical fast direct solver is proposed for the method of moment (MoM) based on the low-rank compression method. The dense impendent matrix of MoM is decomposed into a hierarchical off-diagonal low-rank (HODLR) system with the rank deficiency of the off-diagonal matrixes for far field interactions. Furthermore, the HODLR matrix can be easily expressed with a multiplication of several diagonal matrixes. Each small diagonal matrix block can be inversed easily. So that, the current solution of the integral equation can be expressed with a series of matrix vector products (MVPs) with given excitation vectors.","PeriodicalId":101990,"journal":{"name":"2016 IEEE/ACES International Conference on Wireless Information Technology and Systems (ICWITS) and Applied Computational Electromagnetics (ACES)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114531445","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 : 2016-03-13DOI: 10.1109/ROPACES.2016.7465448
Y. Madany, H. Elkamchouchi, A. E. Ahmed
Modern radio communication systems have to provide higher and higher data rates. Multiple antenna technologies (MATs) have gained much attention in the last few years because of the huge gain. MATs can enhance the communication reliability and the channel capacity levels. Furthermore, multiple antenna systems can have a big contribution to reduce the interference both in the uplink and the downlink. The idea behind multiple antenna diversity is to supply the receiver by multiple versions of the same signal transmitted via independent channels. In modern communication transceiver system, primary aims are to direct high power RF signal from transmitter to antenna while preventing leakage of that large signal into more sensitive front-end of receiver. So, a Single-Pole Double-Throw (SPDT) Transmitter/Receiver (T/R) Switch plays an important role. In this paper, study and design of smart distributed subarray MIMO (DS-MIMO) microstrip antenna system with controller unit has been introduced and investigated. All the entire proposed antenna system has been evaluated using a commercial software. The final proposed design has been fabricated and the radiation characteristics have been illustrated using network analyzer to meet the requirements for receiving diversity applications.
{"title":"Investigation and design of smart distributed subarray MIMO (DS-MIMO) microstrip antenna system for receiving diversity applications","authors":"Y. Madany, H. Elkamchouchi, A. E. Ahmed","doi":"10.1109/ROPACES.2016.7465448","DOIUrl":"https://doi.org/10.1109/ROPACES.2016.7465448","url":null,"abstract":"Modern radio communication systems have to provide higher and higher data rates. Multiple antenna technologies (MATs) have gained much attention in the last few years because of the huge gain. MATs can enhance the communication reliability and the channel capacity levels. Furthermore, multiple antenna systems can have a big contribution to reduce the interference both in the uplink and the downlink. The idea behind multiple antenna diversity is to supply the receiver by multiple versions of the same signal transmitted via independent channels. In modern communication transceiver system, primary aims are to direct high power RF signal from transmitter to antenna while preventing leakage of that large signal into more sensitive front-end of receiver. So, a Single-Pole Double-Throw (SPDT) Transmitter/Receiver (T/R) Switch plays an important role. In this paper, study and design of smart distributed subarray MIMO (DS-MIMO) microstrip antenna system with controller unit has been introduced and investigated. All the entire proposed antenna system has been evaluated using a commercial software. The final proposed design has been fabricated and the radiation characteristics have been illustrated using network analyzer to meet the requirements for receiving diversity applications.","PeriodicalId":101990,"journal":{"name":"2016 IEEE/ACES International Conference on Wireless Information Technology and Systems (ICWITS) and Applied Computational Electromagnetics (ACES)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114636878","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 : 2016-03-13DOI: 10.1109/ROPACES.2016.7465479
M. A. Rahman, R. C. Gough, Matthew M. Moorefield, George B. Zhang, W. Shiroma, A. Ohta
Reconfigurable RF devices can respond dynamically to complex RF environments. Liquid metals have the potential to enable reconfigurable devices that cannot be implemented by more conventional materials and technologies. This paper reviews recent progress by our research group toward the creation of reconfigurable liquid-metal RF devices that use low-power electrical actuation.
{"title":"Electrically actuated liquid metal for reconfigurable RF devices","authors":"M. A. Rahman, R. C. Gough, Matthew M. Moorefield, George B. Zhang, W. Shiroma, A. Ohta","doi":"10.1109/ROPACES.2016.7465479","DOIUrl":"https://doi.org/10.1109/ROPACES.2016.7465479","url":null,"abstract":"Reconfigurable RF devices can respond dynamically to complex RF environments. Liquid metals have the potential to enable reconfigurable devices that cannot be implemented by more conventional materials and technologies. This paper reviews recent progress by our research group toward the creation of reconfigurable liquid-metal RF devices that use low-power electrical actuation.","PeriodicalId":101990,"journal":{"name":"2016 IEEE/ACES International Conference on Wireless Information Technology and Systems (ICWITS) and Applied Computational Electromagnetics (ACES)","volume":"446 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116330265","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 : 2016-03-13DOI: 10.1109/ROPACES.2016.7465390
S. Koziel, A. Bekasiewicz
In this paper, a novel structure of a miniaturized microstrip rat-race coupler has been proposed. Surrogate-based optimization procedures are applied to explicitly reduce the coupler size while maintaining equal power split at the operating frequency of 1 GHz and sufficient bandwidth for return loss and isolation characteristics. The optimization is performed using the objective function with four penalty components. The footprint of the optimized structure is only 350 mm2.
{"title":"Novel structure and size-reduction-oriented design of microstrip compact rat-race coupler","authors":"S. Koziel, A. Bekasiewicz","doi":"10.1109/ROPACES.2016.7465390","DOIUrl":"https://doi.org/10.1109/ROPACES.2016.7465390","url":null,"abstract":"In this paper, a novel structure of a miniaturized microstrip rat-race coupler has been proposed. Surrogate-based optimization procedures are applied to explicitly reduce the coupler size while maintaining equal power split at the operating frequency of 1 GHz and sufficient bandwidth for return loss and isolation characteristics. The optimization is performed using the objective function with four penalty components. The footprint of the optimized structure is only 350 mm2.","PeriodicalId":101990,"journal":{"name":"2016 IEEE/ACES International Conference on Wireless Information Technology and Systems (ICWITS) and Applied Computational Electromagnetics (ACES)","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124753988","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 : 2016-03-13DOI: 10.1109/ROPACES.2016.7465373
M. Liang, Xiaoju Yu, Rafael Sabory-Garcia, W. Ng, M. Gehm, H. Xin
A novel direction of arrival (DOA) estimation system based on a broadband 3D printed Luneburg lens is reported in this paper. Using the property of a Luneburg lens that the focus point of an incident plane wave is at the opposite side on the surface of the lens, 36 diode detectors with 10 degree spacing are mounted around the surface of a 3D printed Luneburg lens to estimate the DOA of a microwave signal in the azimuth plane (full 360 degrees coverage). A correlation algorithm is used to estimate the angle of the incoming signal.
{"title":"Direction of arrival (DOA) estimation system using 3D printed Luneburg lens","authors":"M. Liang, Xiaoju Yu, Rafael Sabory-Garcia, W. Ng, M. Gehm, H. Xin","doi":"10.1109/ROPACES.2016.7465373","DOIUrl":"https://doi.org/10.1109/ROPACES.2016.7465373","url":null,"abstract":"A novel direction of arrival (DOA) estimation system based on a broadband 3D printed Luneburg lens is reported in this paper. Using the property of a Luneburg lens that the focus point of an incident plane wave is at the opposite side on the surface of the lens, 36 diode detectors with 10 degree spacing are mounted around the surface of a 3D printed Luneburg lens to estimate the DOA of a microwave signal in the azimuth plane (full 360 degrees coverage). A correlation algorithm is used to estimate the angle of the incoming signal.","PeriodicalId":101990,"journal":{"name":"2016 IEEE/ACES International Conference on Wireless Information Technology and Systems (ICWITS) and Applied Computational Electromagnetics (ACES)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128240616","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 : 2016-03-13DOI: 10.1109/ROPACES.2016.7465310
S. Ogurtsov, S. Koziel, A. Bekasiewicz
A novel approach to improve axial ratio (AR) of circular polarized (CP) dielectric resonator antennas (DRA) excited with dual-point feeds is presented. It is applicable to DRAs with different cross sections (e.g., square, circular) which are excited though two inputs having a 90-degree angular separation. The approach comprises two major stages. First, a complex excitation at the inputs of a DRA of interest, resulting in the AR of the value of one in the broadside radiation direction at the operation frequency, is determined. This excitation is calculated using the proposed closed-form formulas processing the simulated far-fields of the DRA excited with only one input. Furthermore, it is shown that a certain rigorously computed excitation of unequal amplitudes and 90-degree phase shift may be sufficient - from practical point of view - to ensure high-quality CP far-field for a DRA of interest. Second, the computed excitations serve as design requirements for branch-line couplers feeding the DRA. Numerical examples illustrate our approach.
{"title":"Axial ratio improvement of circular polarized dielectric resonator antennas with dual-point feeds","authors":"S. Ogurtsov, S. Koziel, A. Bekasiewicz","doi":"10.1109/ROPACES.2016.7465310","DOIUrl":"https://doi.org/10.1109/ROPACES.2016.7465310","url":null,"abstract":"A novel approach to improve axial ratio (AR) of circular polarized (CP) dielectric resonator antennas (DRA) excited with dual-point feeds is presented. It is applicable to DRAs with different cross sections (e.g., square, circular) which are excited though two inputs having a 90-degree angular separation. The approach comprises two major stages. First, a complex excitation at the inputs of a DRA of interest, resulting in the AR of the value of one in the broadside radiation direction at the operation frequency, is determined. This excitation is calculated using the proposed closed-form formulas processing the simulated far-fields of the DRA excited with only one input. Furthermore, it is shown that a certain rigorously computed excitation of unequal amplitudes and 90-degree phase shift may be sufficient - from practical point of view - to ensure high-quality CP far-field for a DRA of interest. Second, the computed excitations serve as design requirements for branch-line couplers feeding the DRA. Numerical examples illustrate our approach.","PeriodicalId":101990,"journal":{"name":"2016 IEEE/ACES International Conference on Wireless Information Technology and Systems (ICWITS) and Applied Computational Electromagnetics (ACES)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129739530","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 : 2016-03-13DOI: 10.1109/ROPACES.2016.7465414
Hai Lu, Shumin Wang
Folded dipole is proposed to mitigate the incompatibility between magnetic resonance imaging and transcranial magnetic stimulation. A numerical study by applying the method of moment demonstrate that the effects of eddy current induced on a stimulator can be mitigated by quadrature phase combination of signals from adjacent folded dipoles.
{"title":"A simulation study of folded dipole in magnetic resonance imaging for compatible transcranial magnetic stimulation","authors":"Hai Lu, Shumin Wang","doi":"10.1109/ROPACES.2016.7465414","DOIUrl":"https://doi.org/10.1109/ROPACES.2016.7465414","url":null,"abstract":"Folded dipole is proposed to mitigate the incompatibility between magnetic resonance imaging and transcranial magnetic stimulation. A numerical study by applying the method of moment demonstrate that the effects of eddy current induced on a stimulator can be mitigated by quadrature phase combination of signals from adjacent folded dipoles.","PeriodicalId":101990,"journal":{"name":"2016 IEEE/ACES International Conference on Wireless Information Technology and Systems (ICWITS) and Applied Computational Electromagnetics (ACES)","volume":"58 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133003540","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 : 2016-03-13DOI: 10.1109/ROPACES.2016.7465459
Tyler Rowe, Ting-Yen Shih, N. Behdad
Non-foster matching networks can provide significantly larger bandwidth over passive matching networks. However, when a non-foster matching network, which contains active devices, is used to match electrically small antennas (ESAs), which have high Q impedances, very high currents and voltages are necessary to drive the antenna in transmit applications. This work demonstrates that the selected active element in the non-foster circuit has a large effect on the maximum power that can be radiated from an ESA. High power transistors and triode vacuum tubes are investigated as the active element of the non-foster circuit to improve maximum radiated power.
{"title":"Transmitting power handling limitations of a wideband, non-foster electrically-small antenna","authors":"Tyler Rowe, Ting-Yen Shih, N. Behdad","doi":"10.1109/ROPACES.2016.7465459","DOIUrl":"https://doi.org/10.1109/ROPACES.2016.7465459","url":null,"abstract":"Non-foster matching networks can provide significantly larger bandwidth over passive matching networks. However, when a non-foster matching network, which contains active devices, is used to match electrically small antennas (ESAs), which have high Q impedances, very high currents and voltages are necessary to drive the antenna in transmit applications. This work demonstrates that the selected active element in the non-foster circuit has a large effect on the maximum power that can be radiated from an ESA. High power transistors and triode vacuum tubes are investigated as the active element of the non-foster circuit to improve maximum radiated power.","PeriodicalId":101990,"journal":{"name":"2016 IEEE/ACES International Conference on Wireless Information Technology and Systems (ICWITS) and Applied Computational Electromagnetics (ACES)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130437499","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 : 2016-03-13DOI: 10.1109/ROPACES.2016.7465328
S. Kar, N. T. Sonmez, S. Mambet, N. T. Tokan
This paper examines the beam scanning performance of the matching layers designed on millimeter wave integrated lens antennas with dense material. Millimeter wave extended hemispherical lens antenna made of alumina is coated with different types of solutions for antireflection layers. The lens is illuminated by an aperture coupled lens antenna designed to radiate into alumina at 77GHz. The role of matching layers is demonstrated. A frequency-dependence characterization of the beam pattern clearly showed the existence and impact of internal reflections on beam scanning performance.
{"title":"Comparison of matching layers for extended hemispherical lenses in beam scanning applications","authors":"S. Kar, N. T. Sonmez, S. Mambet, N. T. Tokan","doi":"10.1109/ROPACES.2016.7465328","DOIUrl":"https://doi.org/10.1109/ROPACES.2016.7465328","url":null,"abstract":"This paper examines the beam scanning performance of the matching layers designed on millimeter wave integrated lens antennas with dense material. Millimeter wave extended hemispherical lens antenna made of alumina is coated with different types of solutions for antireflection layers. The lens is illuminated by an aperture coupled lens antenna designed to radiate into alumina at 77GHz. The role of matching layers is demonstrated. A frequency-dependence characterization of the beam pattern clearly showed the existence and impact of internal reflections on beam scanning performance.","PeriodicalId":101990,"journal":{"name":"2016 IEEE/ACES International Conference on Wireless Information Technology and Systems (ICWITS) and Applied Computational Electromagnetics (ACES)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127845581","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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