Pub Date : 2015-10-15DOI: 10.1109/ICEAA.2015.7297387
D. Bajon, S. Massenot, S. Wane
At high frequencies, wave-matter interactions have to be taken into account and the dielectric permittivity can be no longer considered as a constant when scanning a wide frequency band. In this context, broadband measurements will be additionally helpful to develop realistic and suitable models. Kramers-Kronig relationships are seen as efficient tool to derive broad-band equivalent network representations particularly useful for efficiently introducing material anisotropy in time and frequency domains electromagnetic simulation solvers.
{"title":"Incorporation of Kramers-Kronig relationships in the derivation of network representations for modeling and characterizing anisotropic materials","authors":"D. Bajon, S. Massenot, S. Wane","doi":"10.1109/ICEAA.2015.7297387","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297387","url":null,"abstract":"At high frequencies, wave-matter interactions have to be taken into account and the dielectric permittivity can be no longer considered as a constant when scanning a wide frequency band. In this context, broadband measurements will be additionally helpful to develop realistic and suitable models. Kramers-Kronig relationships are seen as efficient tool to derive broad-band equivalent network representations particularly useful for efficiently introducing material anisotropy in time and frequency domains electromagnetic simulation solvers.","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":"134465466","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.2015.7297273
W. Mathis, R. Mathis
It is reported in the literature that electrical-field enhancements can appear in irregular deformed wave-guides. Using Maxwell's equations it is rather difficult to find analytical solutions for these arrangements. On the other hand, it is long been known that wave-guides can be approximated by systems of transmission line equations. In the paper we present this framework for studying cylindrical wave-guides from a geometric point of view and explain how random variables for the description of roughness of the wave-guide surface can be introduce. Finally, we add some comments about a simple example.
{"title":"Electric-field enhancement in cylindrical waveguides modelled by generalized transmission lines","authors":"W. Mathis, R. Mathis","doi":"10.1109/ICEAA.2015.7297273","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297273","url":null,"abstract":"It is reported in the literature that electrical-field enhancements can appear in irregular deformed wave-guides. Using Maxwell's equations it is rather difficult to find analytical solutions for these arrangements. On the other hand, it is long been known that wave-guides can be approximated by systems of transmission line equations. In the paper we present this framework for studying cylindrical wave-guides from a geometric point of view and explain how random variables for the description of roughness of the wave-guide surface can be introduce. Finally, we add some comments about a simple example.","PeriodicalId":277112,"journal":{"name":"2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"32 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":"134598966","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.2015.7297345
I. F. D. Anjos, Silvio E. Barbin
In the present study, the relationship between the AC conductivity, permittivity and loss of vermiculite is presented. The way that different materials react when an electromagnetic field is applied depends strongly on the materials' dielectric properties. In industrial processes that employ microwaves, it is important to know in advance the properties of the material to be processed in particular, its dielectric characteristics. Another important factor to be considered is the variation of the AC conductivity, which is strongly influenced by the behavior of the charge carriers with frequency, permittivity and loss tangent. The frequencies used in the study were 1.60 GHz, 1.80 GHz, 2.00 GHz and 2.45 GHz. The technique is based on the measured S-parameters, followed by a numerical determination through a MATLAB® code based on the Nicolson - Ross - Weir noniterative method. The study demonstrated that AC conductivity of vermiculite is dependent on the frequency and loss and that this dependency influences the exfoliation rate of vermiculite when exfoliated by microwave radiation.
本文研究了蛭石的交流电导率、介电常数与损耗之间的关系。当施加电磁场时，不同材料的反应方式在很大程度上取决于材料的介电性质。在使用微波的工业过程中，事先知道要处理的材料的特性，特别是它的介电特性是很重要的。另一个需要考虑的重要因素是交流电导率的变化，它受载流子的频率、介电常数和损耗正切的行为的强烈影响。研究中使用的频率分别是1.60 GHz、1.80 GHz、2.00 GHz和2.45 GHz。该技术基于测量的s参数，然后通过基于Nicolson - Ross - Weir非迭代方法的MATLAB®代码进行数值确定。研究表明，蛭石的交流电导率依赖于频率和损耗，这种依赖关系影响微波辐射去除蛭石的剥落速率。
{"title":"Permittivity and AC conductivity measurement of hydrated phyllosilicate minerals","authors":"I. F. D. Anjos, Silvio E. Barbin","doi":"10.1109/ICEAA.2015.7297345","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297345","url":null,"abstract":"In the present study, the relationship between the AC conductivity, permittivity and loss of vermiculite is presented. The way that different materials react when an electromagnetic field is applied depends strongly on the materials' dielectric properties. In industrial processes that employ microwaves, it is important to know in advance the properties of the material to be processed in particular, its dielectric characteristics. Another important factor to be considered is the variation of the AC conductivity, which is strongly influenced by the behavior of the charge carriers with frequency, permittivity and loss tangent. The frequencies used in the study were 1.60 GHz, 1.80 GHz, 2.00 GHz and 2.45 GHz. The technique is based on the measured S-parameters, followed by a numerical determination through a MATLAB® code based on the Nicolson - Ross - Weir noniterative method. The study demonstrated that AC conductivity of vermiculite is dependent on the frequency and loss and that this dependency influences the exfoliation rate of vermiculite when exfoliated by microwave radiation.","PeriodicalId":277112,"journal":{"name":"2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"72 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":"134313676","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.2015.7297274
C. Cimala, M. Zang, M. Clemens, J. Feng, B. Schmulling, J. Streckert
This paper deals with the simulation of human exposure to magneto-quasistatic fields of Inductive Power Transfer (IPT) systems. Since the applicability of direct eddy current field solvers for such problems becomes disputable when the scale and/or the resolution of geometries increase, both the Scaled-Frequency FDTD method and the Scalar-Potential Finite Difference (SPFD) approach are extended and used here. Numerical examples for the verification of the procedures and an application including shielding effects in nearby conductive structures are presented. The results are compared to the limits recommended by the International Commission on Non-Ionizing Radiation Protection (ICNIRP).
{"title":"Numerical schemes for high-resolution dosimetry simulations of automotive low frequency Inductive Power Transfer systems","authors":"C. Cimala, M. Zang, M. Clemens, J. Feng, B. Schmulling, J. Streckert","doi":"10.1109/ICEAA.2015.7297274","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297274","url":null,"abstract":"This paper deals with the simulation of human exposure to magneto-quasistatic fields of Inductive Power Transfer (IPT) systems. Since the applicability of direct eddy current field solvers for such problems becomes disputable when the scale and/or the resolution of geometries increase, both the Scaled-Frequency FDTD method and the Scalar-Potential Finite Difference (SPFD) approach are extended and used here. Numerical examples for the verification of the procedures and an application including shielding effects in nearby conductive structures are presented. The results are compared to the limits recommended by the International Commission on Non-Ionizing Radiation Protection (ICNIRP).","PeriodicalId":277112,"journal":{"name":"2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"51 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":"133535563","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.2015.7297246
S. Lalléchère, S. Antonijevic, K. El Khamlichi Drissi, D. Poljak
This contribution aims to demonstrate the ability of advanced time techniques to deal with Ground Penetrating Radar (GPR) applications. It is recognized that GPR systems are subjected to complex environment: parameters from setup (antennas) and environment are hardly ever known with an infinite precision. This issue is mainly due to intrinsic uncertainties (heights of antennas, soil electrical properties for instance) and may be illustrated trough time modeling of thin wire located above a lossy ground. In order to tackle the problem, the aim of this paper is to combine advanced time techniques with stochastic methods to properly access relevant statistics about GPR time responses.
{"title":"Optimized numerical models of thin wire above an imperfect and lossy ground for GPR statistics","authors":"S. Lalléchère, S. Antonijevic, K. El Khamlichi Drissi, D. Poljak","doi":"10.1109/ICEAA.2015.7297246","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297246","url":null,"abstract":"This contribution aims to demonstrate the ability of advanced time techniques to deal with Ground Penetrating Radar (GPR) applications. It is recognized that GPR systems are subjected to complex environment: parameters from setup (antennas) and environment are hardly ever known with an infinite precision. This issue is mainly due to intrinsic uncertainties (heights of antennas, soil electrical properties for instance) and may be illustrated trough time modeling of thin wire located above a lossy ground. In order to tackle the problem, the aim of this paper is to combine advanced time techniques with stochastic methods to properly access relevant statistics about GPR time responses.","PeriodicalId":277112,"journal":{"name":"2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"89 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":"129365297","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.2015.7297133
D. Poljak, S. Šesnić, D. Parić, K. El Khamlichi Drissi
The paper deals with the study of a transient electric field transmitted into the dielectric half-space by means of the time domain analysis method. The time domain formulation is based on the space-time Hallen integral equation. The numerical solution is carried out via the space-time scheme of the Galerkin-Bubnov variant of the Indirect Boundary Element Method (GB-IBEM). Once determining the current along the dipole antenna, it is possible to determine the field reflected from the interface and the field transmitted into lower medium by solving the corresponding field integrals. Some illustrative numerical results for the reflected/transmitted field are presented in the paper.
{"title":"Direct time domain modeling of the transient field transmitted in a dielectric half-space for GPR applications","authors":"D. Poljak, S. Šesnić, D. Parić, K. El Khamlichi Drissi","doi":"10.1109/ICEAA.2015.7297133","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297133","url":null,"abstract":"The paper deals with the study of a transient electric field transmitted into the dielectric half-space by means of the time domain analysis method. The time domain formulation is based on the space-time Hallen integral equation. The numerical solution is carried out via the space-time scheme of the Galerkin-Bubnov variant of the Indirect Boundary Element Method (GB-IBEM). Once determining the current along the dipole antenna, it is possible to determine the field reflected from the interface and the field transmitted into lower medium by solving the corresponding field integrals. Some illustrative numerical results for the reflected/transmitted field are presented in the paper.","PeriodicalId":277112,"journal":{"name":"2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"11 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":"125745326","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.2015.7297364
M. Bouslama, M. Traii, A. Gharsallah, T. Denidni
In this paper, a reconfigurable frequency selective surface is proposed to control the transmission/reflection of the incident EM waves. A novel FSS unit cell contains a strip and ten typical square loops united together to create a dual stop band response. Besides, a PIN-diode is incorporated to alter the transmission/reflection coefficients. The proposed reconfigurable FSS unit cell provides a dual-band response centered at 2.25 GHz and 4.2 GHz. Therefore, the design can be used in S-band shielding applications.
{"title":"Reconfigurable dual band filter using new frequency selective surface","authors":"M. Bouslama, M. Traii, A. Gharsallah, T. Denidni","doi":"10.1109/ICEAA.2015.7297364","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297364","url":null,"abstract":"In this paper, a reconfigurable frequency selective surface is proposed to control the transmission/reflection of the incident EM waves. A novel FSS unit cell contains a strip and ten typical square loops united together to create a dual stop band response. Besides, a PIN-diode is incorporated to alter the transmission/reflection coefficients. The proposed reconfigurable FSS unit cell provides a dual-band response centered at 2.25 GHz and 4.2 GHz. Therefore, the design can be used in S-band shielding applications.","PeriodicalId":277112,"journal":{"name":"2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"34 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":"124761823","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.2015.7297352
S. Podilchak, J. Shaker, R. Chaharmir, Y. Antar
We propose a new type of planar guide which can offer advantageous polarization characteristics. Consider an arrangement of sub-wavelength inclusions embedded within a host dielectric. These elements can alter the effective dielectric constant of the slab, and when contained within a fixed width for transmission line applications, a planar dielectric-based guide can be realized that allows for field confinement and power routing. Concepts are extended to new guide transitions. In particular, a 90° corner bend and a waveguide cross-over. These novel routing techniques, which exploit line anisotropy and integration and can offer enhanced data capacity with improved signal integrity, are also applicable to new planar antennas and other printed circuits.
{"title":"Microwave waveguide transitions using planar anisotropic image guides","authors":"S. Podilchak, J. Shaker, R. Chaharmir, Y. Antar","doi":"10.1109/ICEAA.2015.7297352","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297352","url":null,"abstract":"We propose a new type of planar guide which can offer advantageous polarization characteristics. Consider an arrangement of sub-wavelength inclusions embedded within a host dielectric. These elements can alter the effective dielectric constant of the slab, and when contained within a fixed width for transmission line applications, a planar dielectric-based guide can be realized that allows for field confinement and power routing. Concepts are extended to new guide transitions. In particular, a 90° corner bend and a waveguide cross-over. These novel routing techniques, which exploit line anisotropy and integration and can offer enhanced data capacity with improved signal integrity, are also applicable to new planar antennas and other printed circuits.","PeriodicalId":277112,"journal":{"name":"2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"63 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":"124793036","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.2015.7297069
R. Zhao, L. Lei, Jun Hu, M. Jiang, Z. Nie
In this paper, an integral equation domain decomposition method based on hybrid solvers (HS-DDM) are developed for modeling of electromagnetic radiation problems. Based on the philosophy of `divided and conquer', the IE-DDM divides the original multi-scale problem into many closed non-overlapping sub-domains. The Robin transmission conditions ensure the continuity of the currents across adjacent sub-domains. The meshes of different sub-domains can be allowed to be non-conformal, different basis functions based on large and small patches can be used to reduce the dimension of matrix and model the geometry properly based on its local property. Further, different fast solvers can be easily incorporated into the framework of IE-DDM to reduce the time and memory consumption according to the property of different sub-domains. Here, the multilevel fast multipole algorithm (MLFMA) and hierarchical (ℋ-) matrices method are adopted in this HS-DDM to realize efficient solution of multi-scale electromagnetic radiation problems. The MLFMA is used in large, smooth sub-domains, while ℋ-Matrices is used instead in small, dense sub-domains where the MLFMA is inefficient. Numerical results demonstrate the validity of the HS-DDM.
{"title":"An integral equation domain decomposition method based on hybrid solvers for modeling of electromagnetic radiation","authors":"R. Zhao, L. Lei, Jun Hu, M. Jiang, Z. Nie","doi":"10.1109/ICEAA.2015.7297069","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297069","url":null,"abstract":"In this paper, an integral equation domain decomposition method based on hybrid solvers (HS-DDM) are developed for modeling of electromagnetic radiation problems. Based on the philosophy of `divided and conquer', the IE-DDM divides the original multi-scale problem into many closed non-overlapping sub-domains. The Robin transmission conditions ensure the continuity of the currents across adjacent sub-domains. The meshes of different sub-domains can be allowed to be non-conformal, different basis functions based on large and small patches can be used to reduce the dimension of matrix and model the geometry properly based on its local property. Further, different fast solvers can be easily incorporated into the framework of IE-DDM to reduce the time and memory consumption according to the property of different sub-domains. Here, the multilevel fast multipole algorithm (MLFMA) and hierarchical (ℋ-) matrices method are adopted in this HS-DDM to realize efficient solution of multi-scale electromagnetic radiation problems. The MLFMA is used in large, smooth sub-domains, while ℋ-Matrices is used instead in small, dense sub-domains where the MLFMA is inefficient. Numerical results demonstrate the validity of the HS-DDM.","PeriodicalId":277112,"journal":{"name":"2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"37 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":"125095081","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.2015.7297382
L. Arnaut
Realistic operating conditions of reverberation chambers are characterized by nonzero levels of inter- and intra-correlation between Cartesian field components and their I/Q components, giving rise to statistical anisotropy and complex ellipticity (noncircularity) of the random electromagnetic field, respectively. It is shown how empirical copulas for their joint probability distribution function that link the components' marginal distributions can be characterized. The technique is applied to measured data in a reverberation chamber near its lowest usable frequency.
{"title":"Characterization of correlated random Cartesian field components in reverberation chambers using copulas","authors":"L. Arnaut","doi":"10.1109/ICEAA.2015.7297382","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297382","url":null,"abstract":"Realistic operating conditions of reverberation chambers are characterized by nonzero levels of inter- and intra-correlation between Cartesian field components and their I/Q components, giving rise to statistical anisotropy and complex ellipticity (noncircularity) of the random electromagnetic field, respectively. It is shown how empirical copulas for their joint probability distribution function that link the components' marginal distributions can be characterized. The technique is applied to measured data in a reverberation chamber near its lowest usable frequency.","PeriodicalId":277112,"journal":{"name":"2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"62 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":"130273845","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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