Pub Date : 2015-10-15DOI: 10.1109/ICEAA.2015.7297323
O. Ergul, B. Karaosmanoğlu
We present an approximate diagonalization of the three-dimensional Green's function for straightforward broadband implementations of the multilevel fast multipole algorithm. The diagonalization is based on the use of scaled spherical functions and plane waves, leading to approximate but stable expansions for arbitrarily short distances with respect to wavelength. Despite its limited accuracy, the approximate diagonalization is easy to insert into existing MLFMA implementations for converting them into broadband solvers without reprogramming efforts. We demonstrate the effectiveness of the developed implementation on multiscale problems that are difficult to solve without low-frequency stabilizations.
{"title":"Broadband MLFMA based on an approximate diagonalization of the three-dimensional Green's function","authors":"O. Ergul, B. Karaosmanoğlu","doi":"10.1109/ICEAA.2015.7297323","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297323","url":null,"abstract":"We present an approximate diagonalization of the three-dimensional Green's function for straightforward broadband implementations of the multilevel fast multipole algorithm. The diagonalization is based on the use of scaled spherical functions and plane waves, leading to approximate but stable expansions for arbitrarily short distances with respect to wavelength. Despite its limited accuracy, the approximate diagonalization is easy to insert into existing MLFMA implementations for converting them into broadband solvers without reprogramming efforts. We demonstrate the effectiveness of the developed implementation on multiscale problems that are difficult to solve without low-frequency stabilizations.","PeriodicalId":277112,"journal":{"name":"2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129852317","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 : 2015-10-15DOI: 10.1109/ICEAA.2015.7297269
M. Lanini, S. Poretti, A. Salvadè, R. Monleone
A new wideband sensor for microwave imaging is introduced. The structure consists of a folded quasi-self complementary monopole antenna which is applied in contact with the sample-under-test (SUT) to minimize the interface impedance mismatch. The sensor presents a slim design that allows the development of very compact antenna arrays, thus avoiding the need of coupling mediums.
{"title":"Design of a slim wideband-antenna to overcome the strong reflection of the air-to-sample interface in microwave imaging","authors":"M. Lanini, S. Poretti, A. Salvadè, R. Monleone","doi":"10.1109/ICEAA.2015.7297269","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297269","url":null,"abstract":"A new wideband sensor for microwave imaging is introduced. The structure consists of a folded quasi-self complementary monopole antenna which is applied in contact with the sample-under-test (SUT) to minimize the interface impedance mismatch. The sensor presents a slim design that allows the development of very compact antenna arrays, thus avoiding the need of coupling mediums.","PeriodicalId":277112,"journal":{"name":"2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126329442","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 : 2015-10-15DOI: 10.1109/ICEAA.2015.7297124
M. Raffetto, P. K. Ramakrishnan
A first error analysis for finite element solutions of time-harmonic boundary value problems involving cylinders moving in the axial direction is carried out. It is shown that the solutions are affected by errors which behave in a very regular way, as it happens with traditional problems and finite element simulators in the presence of motionless objects. The effects of the motion on the errors considered seems to be not able to significantly modify the usual reliability of finite element simulators.
{"title":"First error analyses for finite element solutions of boundary value problems involving cylinders moving in the axial direction","authors":"M. Raffetto, P. K. Ramakrishnan","doi":"10.1109/ICEAA.2015.7297124","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297124","url":null,"abstract":"A first error analysis for finite element solutions of time-harmonic boundary value problems involving cylinders moving in the axial direction is carried out. It is shown that the solutions are affected by errors which behave in a very regular way, as it happens with traditional problems and finite element simulators in the presence of motionless objects. The effects of the motion on the errors considered seems to be not able to significantly modify the usual reliability of finite element simulators.","PeriodicalId":277112,"journal":{"name":"2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121264248","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 : 2015-10-15DOI: 10.1109/ICEAA.2015.7297127
Su Yan, Jianming Jin
A high power microwave (HPM) device can be damaged in a high-power environment due to an air or dielectric breakdown inside the HPM device or on the output window. Such a breakdown process can be modeled using either a simple nonlinear conductivity model or a plasma fluid model. In this paper, we propose a nonlinear time-domain finite element formulation in combination with a Newton method to solve the breakdown problems. Both the nonlinear conductivity and the plasma fluid models are incorporated, and the nonlinear breakdown phenomena are simulated and analyzed.
{"title":"Nonlinear Finite Element Formulation And Analysis of high-power air/dielectric breakdown in time domain","authors":"Su Yan, Jianming Jin","doi":"10.1109/ICEAA.2015.7297127","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297127","url":null,"abstract":"A high power microwave (HPM) device can be damaged in a high-power environment due to an air or dielectric breakdown inside the HPM device or on the output window. Such a breakdown process can be modeled using either a simple nonlinear conductivity model or a plasma fluid model. In this paper, we propose a nonlinear time-domain finite element formulation in combination with a Newton method to solve the breakdown problems. Both the nonlinear conductivity and the plasma fluid models are incorporated, and the nonlinear breakdown phenomena are simulated and analyzed.","PeriodicalId":277112,"journal":{"name":"2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122560058","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 : 2015-10-15DOI: 10.1109/ICEAA.2015.7297266
G. Greving, W. Biermann, R. Mundt
This paper describes the application of the numerical 3D-modelling and scattering analysis for the multi-scatterer case, such as for wind-farms WF related to a VOR-navigation system. The superposition of complex field components is discussed in the context of the VOR-system bearing angle errors and the rss-superposition and decomposition of bearing errors. Numerical results are presented which show the general validity of the rss-scheme.
{"title":"Integrated scattering distortion analysis of multi-scatterers for navigation system simulations - example of wind turbines","authors":"G. Greving, W. Biermann, R. Mundt","doi":"10.1109/ICEAA.2015.7297266","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297266","url":null,"abstract":"This paper describes the application of the numerical 3D-modelling and scattering analysis for the multi-scatterer case, such as for wind-farms WF related to a VOR-navigation system. The superposition of complex field components is discussed in the context of the VOR-system bearing angle errors and the rss-superposition and decomposition of bearing errors. Numerical results are presented which show the general validity of the rss-scheme.","PeriodicalId":277112,"journal":{"name":"2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122636952","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 : 2015-10-15DOI: 10.1109/ICEAA.2015.7297109
K. Goto, N. Sumikawa, T. Santikul, R. Asai
By extending a frequency domain (FD) uniform asymptotic solution (FD-UAS), we develop a time-domain (TD) asymptotic-numerical solution (TD-ANS) for a transient scattered field when a modulated ultra-wideband (UWB) pulse wave is incident on the convex portion of a cylindrically curved conducting open sheet with two straight edges. The TD-ANS is represented by a combination of the transient scattered field elements which consist of a whispering gallery mode radiation (WG), a surface diffracted ray (SD), a creeping wave incidence and edge diffracted ray (CWED), a reflected geometric optical ray (RGO), and a reflected and edge diffracted ray (RED). The validity and computation rate of the TD-ANS are confirmed by comparing with the reference solution. We show that the TD-ANS proposed here is effective understanding the scattering phenomena.
{"title":"Study on transient scattered field from a cylindrically curved conducting open sheet with two straight edges excited by UWB pulse wave","authors":"K. Goto, N. Sumikawa, T. Santikul, R. Asai","doi":"10.1109/ICEAA.2015.7297109","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297109","url":null,"abstract":"By extending a frequency domain (FD) uniform asymptotic solution (FD-UAS), we develop a time-domain (TD) asymptotic-numerical solution (TD-ANS) for a transient scattered field when a modulated ultra-wideband (UWB) pulse wave is incident on the convex portion of a cylindrically curved conducting open sheet with two straight edges. The TD-ANS is represented by a combination of the transient scattered field elements which consist of a whispering gallery mode radiation (WG), a surface diffracted ray (SD), a creeping wave incidence and edge diffracted ray (CWED), a reflected geometric optical ray (RGO), and a reflected and edge diffracted ray (RED). The validity and computation rate of the TD-ANS are confirmed by comparing with the reference solution. We show that the TD-ANS proposed here is effective understanding the scattering phenomena.","PeriodicalId":277112,"journal":{"name":"2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"131 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122453142","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 : 2015-10-15DOI: 10.1109/ICEAA.2015.7297400
Jin Yan, D. Jiao
In this paper, we present a new time-domain method that is naturally matrix free, i.e., requiring no matrix solution, regardless of whether the discretization is a structured grid or an unstructured mesh. Its matrix-free property is independent of the element shape used for discretization, and its implementation is straightforward. No interpolations, projections, and mass lumping are required. The accuracy and stability of the proposed method are theoretically analyzed and shown to be guaranteed. In addition, no dual mesh is needed and the tangential continuity of the fields is satisfied across the element interface. The flexible framework of the proposed method also allows for a straightforward extension to higher-order accuracy in both electric and magnetic fields. Numerical experiments have validated the accuracy and generality of the proposed matrix-free method.
{"title":"Accurate and stable matrix-free time-domain method independent of element shape for general electromagnetic analysis","authors":"Jin Yan, D. Jiao","doi":"10.1109/ICEAA.2015.7297400","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297400","url":null,"abstract":"In this paper, we present a new time-domain method that is naturally matrix free, i.e., requiring no matrix solution, regardless of whether the discretization is a structured grid or an unstructured mesh. Its matrix-free property is independent of the element shape used for discretization, and its implementation is straightforward. No interpolations, projections, and mass lumping are required. The accuracy and stability of the proposed method are theoretically analyzed and shown to be guaranteed. In addition, no dual mesh is needed and the tangential continuity of the fields is satisfied across the element interface. The flexible framework of the proposed method also allows for a straightforward extension to higher-order accuracy in both electric and magnetic fields. Numerical experiments have validated the accuracy and generality of the proposed matrix-free method.","PeriodicalId":277112,"journal":{"name":"2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123922805","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 : 2015-10-15DOI: 10.1109/ICEAA.2015.7297289
R. Páez-Hernández, M. Zamora-Gómez, A. Ramírez-Rojas, J. M. Velázquez-Arcos
The present different types of industrial applications and products make use of electromagnetic energy. One way to this energy, the constitutes the radio frequency (RF), in which radio waves and microwaves are used in telecommunications. The RF emissions can be studied in terms of energy, radiation or electric field; radiation is defined as the energy propagation through space in the form of waves or particles. This electromagnetic radiation can be understood as the set of electric and magnetic waves that move together through space generated by the movement of electrical charges that may take place in a metallic conductive object, such as an antenna. The effects of electromagnetic radiation are so generally imperceptibles, by the above is importance of the study of these waves because of the use and management of mobile devices that go hand in hand with time of use and the dissipated energy and avoid injuries in the health. In this work we present an analysis of the issued electromagnetic radiation from a cell phone. We did measurements with an device electric field measure PCE-EM29. From these measurements, we observe that there an important variation of the electromagnetic field, without cellular signal and with cellular signal, so this we indicate that the electromagnetic waves could damage tissue in the ear and the face region.
{"title":"Electromagnetic field produced by a cell phone","authors":"R. Páez-Hernández, M. Zamora-Gómez, A. Ramírez-Rojas, J. M. Velázquez-Arcos","doi":"10.1109/ICEAA.2015.7297289","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297289","url":null,"abstract":"The present different types of industrial applications and products make use of electromagnetic energy. One way to this energy, the constitutes the radio frequency (RF), in which radio waves and microwaves are used in telecommunications. The RF emissions can be studied in terms of energy, radiation or electric field; radiation is defined as the energy propagation through space in the form of waves or particles. This electromagnetic radiation can be understood as the set of electric and magnetic waves that move together through space generated by the movement of electrical charges that may take place in a metallic conductive object, such as an antenna. The effects of electromagnetic radiation are so generally imperceptibles, by the above is importance of the study of these waves because of the use and management of mobile devices that go hand in hand with time of use and the dissipated energy and avoid injuries in the health. In this work we present an analysis of the issued electromagnetic radiation from a cell phone. We did measurements with an device electric field measure PCE-EM29. From these measurements, we observe that there an important variation of the electromagnetic field, without cellular signal and with cellular signal, so this we indicate that the electromagnetic waves could damage tissue in the ear and the face region.","PeriodicalId":277112,"journal":{"name":"2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117317444","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 : 2015-10-15DOI: 10.1109/ICEAA.2015.7297359
J. Russer, P. Russer, M. Konovalyuk, A. Gorbunova, A. Baev, Y. Kuznetsov
Second order CS stochastic processes are non-stationary stochastic processes, where the TDCM depends on the global time and the time difference, and the dependence on the global time is periodic. This autocorrelation function can be represented by a 2D cyclic correlation spectrum containing delta functions at frequencies multiple to the cycle frequency of the stochastic process. Accordingly a CS stochastic EM field can be represented in frequency domain by a cyclic correlation dyadic. containing corresponding delta functions. The experimental characterization of the CS stochastic process shows the presence of spikes at frequencies multiple to the cycle frequency coinciding with the signal transmission rate on 1000BASE-T Gigabit Ethernet twisted-pair cable.
{"title":"Analysis of cyclostationary stochastic electromagnetic fields","authors":"J. Russer, P. Russer, M. Konovalyuk, A. Gorbunova, A. Baev, Y. Kuznetsov","doi":"10.1109/ICEAA.2015.7297359","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297359","url":null,"abstract":"Second order CS stochastic processes are non-stationary stochastic processes, where the TDCM depends on the global time and the time difference, and the dependence on the global time is periodic. This autocorrelation function can be represented by a 2D cyclic correlation spectrum containing delta functions at frequencies multiple to the cycle frequency of the stochastic process. Accordingly a CS stochastic EM field can be represented in frequency domain by a cyclic correlation dyadic. containing corresponding delta functions. The experimental characterization of the CS stochastic process shows the presence of spikes at frequencies multiple to the cycle frequency coinciding with the signal transmission rate on 1000BASE-T Gigabit Ethernet twisted-pair cable.","PeriodicalId":277112,"journal":{"name":"2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114187636","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 : 2015-10-15DOI: 10.1109/ICEAA.2015.7297299
C. Lucianaz, G. Greco, S. Bertoldo, M. Allegretti
The problem that we have addressed with the presented study is the absolute localization of buried RFID tags in an outdoor environment where the tag is. This is the scenario that we have envisaged when the RFID sensors are installed inside a moving body like a glacier or a slow landslide. During the tags dislocation it is possible to measure the depth of the installation and to define the absolute coordinate of the installation points using a topographic GNSS receiver. Afterwards the body evolves with time, moves and after a while (e. g. 1 month, 1 year) it is necessary to locate the sensors in order to quantify the absolute movement. To find the new location we have decided to investigate a multilateration-based localization technique. In this paper we describe the approach to develop a low cost system for the reading of the tags and for their localization without the need of expensive radar systems (e. g. GPR) to locate them.
{"title":"Real time outdoor localization of buried RFID tags through statistical methods","authors":"C. Lucianaz, G. Greco, S. Bertoldo, M. Allegretti","doi":"10.1109/ICEAA.2015.7297299","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297299","url":null,"abstract":"The problem that we have addressed with the presented study is the absolute localization of buried RFID tags in an outdoor environment where the tag is. This is the scenario that we have envisaged when the RFID sensors are installed inside a moving body like a glacier or a slow landslide. During the tags dislocation it is possible to measure the depth of the installation and to define the absolute coordinate of the installation points using a topographic GNSS receiver. Afterwards the body evolves with time, moves and after a while (e. g. 1 month, 1 year) it is necessary to locate the sensors in order to quantify the absolute movement. To find the new location we have decided to investigate a multilateration-based localization technique. In this paper we describe the approach to develop a low cost system for the reading of the tags and for their localization without the need of expensive radar systems (e. g. GPR) to locate them.","PeriodicalId":277112,"journal":{"name":"2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115762198","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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