Pub Date : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637271
M. Attia, M. Ney, T. Aguili
This paper presents a comparative analysis of the numerical dispersion of 3D FD-TLM (Frequency Domain Transmission Line Matrix) nodes. Three principal nodes are considered for this analysis: The Symmetrical Condensed Node (SCN), The Hybrid Symmetrical Condensed Node (HSCN) and the Super Symmetrical Condensed Node (SSCN). Numerical results are obtained for a rectangular waveguide with dielectric discontinuity. Both cubic and parallelepiped meshes were used to model the structure. It has been found that characteristics of those nodes depend on the cell aspect ratio and their performances seem to confirm those found with TD-TLM (Time Domain Transmission Line Matrix).
{"title":"Comparative analysis between 3D-TLM Nodes in the frequency domain","authors":"M. Attia, M. Ney, T. Aguili","doi":"10.1109/URSI-EMTS.2010.5637271","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637271","url":null,"abstract":"This paper presents a comparative analysis of the numerical dispersion of 3D FD-TLM (Frequency Domain Transmission Line Matrix) nodes. Three principal nodes are considered for this analysis: The Symmetrical Condensed Node (SCN), The Hybrid Symmetrical Condensed Node (HSCN) and the Super Symmetrical Condensed Node (SSCN). Numerical results are obtained for a rectangular waveguide with dielectric discontinuity. Both cubic and parallelepiped meshes were used to model the structure. It has been found that characteristics of those nodes depend on the cell aspect ratio and their performances seem to confirm those found with TD-TLM (Time Domain Transmission Line Matrix).","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"171 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123202839","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 : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637329
W. Wiesbeck, L. Reichardt
Mobile communications is usually understood as phoning while moving, with the link via a base station. The success of mobile communications stimulated the idea of direct mobile to mobile communications in and with vehicles. In the last few years regulation authorities made the necessary spectrum in the 5.9 GHz frequency range available and set up preliminary rules. These are the basis for R&D in this wide area. In this paper the basic ideas and primarily the communications channel are discussed.
{"title":"C2X communications overview","authors":"W. Wiesbeck, L. Reichardt","doi":"10.1109/URSI-EMTS.2010.5637329","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637329","url":null,"abstract":"Mobile communications is usually understood as phoning while moving, with the link via a base station. The success of mobile communications stimulated the idea of direct mobile to mobile communications in and with vehicles. In the last few years regulation authorities made the necessary spectrum in the 5.9 GHz frequency range available and set up preliminary rules. These are the basis for R&D in this wide area. In this paper the basic ideas and primarily the communications channel are discussed.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123821573","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 : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637003
S. Maslovski, Tiago A. Morgado, M. Silveirinha
Reflection at an interface of air and a spatially dispersive medium is considered. It is shown that it is possible to construct an equivalent source-driven problem dealing only with an unbounded medium from which the half-space reflection can be found. The developed method is applied to the case of an interface with tilted wires and is found to be in perfect agreement with the approaches based on additional boundary conditions.
{"title":"The auxiliary source method and its application to the reflection problem at an interface with tilted wires","authors":"S. Maslovski, Tiago A. Morgado, M. Silveirinha","doi":"10.1109/URSI-EMTS.2010.5637003","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637003","url":null,"abstract":"Reflection at an interface of air and a spatially dispersive medium is considered. It is shown that it is possible to construct an equivalent source-driven problem dealing only with an unbounded medium from which the half-space reflection can be found. The developed method is applied to the case of an interface with tilted wires and is found to be in perfect agreement with the approaches based on additional boundary conditions.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131888688","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 : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637385
H. Kawaguchi, T. Weiland
Author has been working in development of the Time Domain Boundary Element Method (TDBEM) for transient analysis of electromagnetic microwave phenomena. The main target application of the TDBEM was particle accelerator wake field analysis, and then assumptions of zero initial value and perfect electric conductor boundary were used. This paper presents a more general formulation of the TDBEM, an initial value problem formulation for the TDBEM. In addition, a four dimensional domain decomposition method in time domain simulation is also introduced as an application of the initial value formulation of the TDBEM.
{"title":"Four dimensional domain decomposition method in microwave simulation by initial value formulation of Time Domain BEM","authors":"H. Kawaguchi, T. Weiland","doi":"10.1109/URSI-EMTS.2010.5637385","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637385","url":null,"abstract":"Author has been working in development of the Time Domain Boundary Element Method (TDBEM) for transient analysis of electromagnetic microwave phenomena. The main target application of the TDBEM was particle accelerator wake field analysis, and then assumptions of zero initial value and perfect electric conductor boundary were used. This paper presents a more general formulation of the TDBEM, an initial value problem formulation for the TDBEM. In addition, a four dimensional domain decomposition method in time domain simulation is also introduced as an application of the initial value formulation of the TDBEM.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131695644","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 : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637030
M. Gustafsson, D. Sjoberg, A. Bernland, G. Kristensson, C. Sohl
Sum rules are useful in many branches of physics and engineering as they relate all spectrum parameter values with their asymptotic expansions. Properties of the dynamic response can hence be inferred by the, in many cases much simpler, static response. This has e.g., been used for lossless matching networks, radar absorbers, extinction cross section, partial realized gain of antennas, high-impedance surfaces, transmission cross section, transmission coefficients, and temporal dispersion of metamaterials. Here, several sum rules and their associated physical bounds are reviewed and it is shown that integral identities for Herglotz functions offer a unified approach in deriving them.
{"title":"Sum rules and physical bounds in electromagnetic theory","authors":"M. Gustafsson, D. Sjoberg, A. Bernland, G. Kristensson, C. Sohl","doi":"10.1109/URSI-EMTS.2010.5637030","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637030","url":null,"abstract":"Sum rules are useful in many branches of physics and engineering as they relate all spectrum parameter values with their asymptotic expansions. Properties of the dynamic response can hence be inferred by the, in many cases much simpler, static response. This has e.g., been used for lossless matching networks, radar absorbers, extinction cross section, partial realized gain of antennas, high-impedance surfaces, transmission cross section, transmission coefficients, and temporal dispersion of metamaterials. Here, several sum rules and their associated physical bounds are reviewed and it is shown that integral identities for Herglotz functions offer a unified approach in deriving them.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130568958","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 : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637210
J. Steinhoff, S. Chitta
A new method is described in this paper that has the potential to greatly extend the range of application of Eulerian computational methods for many problems. The new method has many of the advantages of Green's Function based integral equation methods for long distance propagation since the propagation distance can be indefinitely long. However, unlike Green's Function schemes, which are useful for uniform index of refraction in simple domains, since the new method is an Eulerian finite difference technique; it allows short pulses to automatically propagate through regions of varying index of refraction and undergo multiple scattering in complex domains. It also can automatically capture produced waves (on sufficiently fine grids) near a source (antennas and scatterers) and transfer them to a sequence of coarser grids for efficient long range propagation. Unlike Ray Tracing schemes, the new method propagates entire smooth surfaces, greatly simplifying the computation of solutions over extended domains.
{"title":"Nonlinear Localized structures for solving wave equations over long distances","authors":"J. Steinhoff, S. Chitta","doi":"10.1109/URSI-EMTS.2010.5637210","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637210","url":null,"abstract":"A new method is described in this paper that has the potential to greatly extend the range of application of Eulerian computational methods for many problems. The new method has many of the advantages of Green's Function based integral equation methods for long distance propagation since the propagation distance can be indefinitely long. However, unlike Green's Function schemes, which are useful for uniform index of refraction in simple domains, since the new method is an Eulerian finite difference technique; it allows short pulses to automatically propagate through regions of varying index of refraction and undergo multiple scattering in complex domains. It also can automatically capture produced waves (on sufficiently fine grids) near a source (antennas and scatterers) and transfer them to a sequence of coarser grids for efficient long range propagation. Unlike Ray Tracing schemes, the new method propagates entire smooth surfaces, greatly simplifying the computation of solutions over extended domains.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124632328","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 : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637308
Teruaki Yoshida, R. Fujimoto, K. Shin, M. Nishi
We have gotten the first opportunity to observe characteristics of the FM radio wave propagated over the epicenter. In our observation system installed at Nobeyama, fluctuations of the FM radio wave of 82.3MHz had been observed on the two Niigata Prefecture earthquakes on October 23 in 2004 and on July 16 in 2007. In this paper, the propagation characteristics of FM radio wave are carefully checked for six years. Some EM anomalies of the FM radio waves had been detected before the earthquakes. However, the similar EM anomalies were detected not only before the earthquakes but also the following years. They have good correlated with the refractive index gradient of the atmosphere. Then, these EM anomalies are concluded not due to seismic but meteorological phenomena.
{"title":"Characteristics of the FM radio waves propagated over the epicenters","authors":"Teruaki Yoshida, R. Fujimoto, K. Shin, M. Nishi","doi":"10.1109/URSI-EMTS.2010.5637308","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637308","url":null,"abstract":"We have gotten the first opportunity to observe characteristics of the FM radio wave propagated over the epicenter. In our observation system installed at Nobeyama, fluctuations of the FM radio wave of 82.3MHz had been observed on the two Niigata Prefecture earthquakes on October 23 in 2004 and on July 16 in 2007. In this paper, the propagation characteristics of FM radio wave are carefully checked for six years. Some EM anomalies of the FM radio waves had been detected before the earthquakes. However, the similar EM anomalies were detected not only before the earthquakes but also the following years. They have good correlated with the refractive index gradient of the atmosphere. Then, these EM anomalies are concluded not due to seismic but meteorological phenomena.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"169 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116435551","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 : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637445
T. Sarkar, M. Salazar-Palma
There are two different ways to communicate with wide bandwidth signals. One is to take a signal with a very narrow instantaneous bandwidth and use a frequency hopping technique as being currently used in a CDMA type of environment to generate a wideband signal. This is easy to implement and currently being done for transmission and reception of signals which have small instantaneous bandwidth. The other approach is to deal directly with transmitting a wide baseband signal. For wide baseband data transmission, like signals from computers, the instantaneous bandwidth is very large. The point of this paper is that antennas are highly dispersive devices and their impulse responses must be taken into account in the design of any system which plans to transmit a wide baseband signal. Without taking the antenna effects into account, the wide transmitted baseband signals are quite meaningless. Simple expressions are derived to illustrate that even a point source type of antenna which is virtually nonexistent produces a severe distortion to the signal. The objective of this paper is to bring out the importance of antennas in any wide baseband type of transmission. Also, it is important to note that the transmit waveform is not equal to the receive waveform so the reciprocity of the antenna patterns do not hold in the time domain! Experimental evidence will be presented to illustrate what principles are involved in the design of a century bandwidth antenna. Moreover, what is necessary to establish a completely dispersionless channel with 20 GHz bandwidth!
{"title":"Characterization of ultrawideband antennas","authors":"T. Sarkar, M. Salazar-Palma","doi":"10.1109/URSI-EMTS.2010.5637445","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637445","url":null,"abstract":"There are two different ways to communicate with wide bandwidth signals. One is to take a signal with a very narrow instantaneous bandwidth and use a frequency hopping technique as being currently used in a CDMA type of environment to generate a wideband signal. This is easy to implement and currently being done for transmission and reception of signals which have small instantaneous bandwidth. The other approach is to deal directly with transmitting a wide baseband signal. For wide baseband data transmission, like signals from computers, the instantaneous bandwidth is very large. The point of this paper is that antennas are highly dispersive devices and their impulse responses must be taken into account in the design of any system which plans to transmit a wide baseband signal. Without taking the antenna effects into account, the wide transmitted baseband signals are quite meaningless. Simple expressions are derived to illustrate that even a point source type of antenna which is virtually nonexistent produces a severe distortion to the signal. The objective of this paper is to bring out the importance of antennas in any wide baseband type of transmission. Also, it is important to note that the transmit waveform is not equal to the receive waveform so the reciprocity of the antenna patterns do not hold in the time domain! Experimental evidence will be presented to illustrate what principles are involved in the design of a century bandwidth antenna. Moreover, what is necessary to establish a completely dispersionless channel with 20 GHz bandwidth!","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127060977","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 : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637136
L. Lizzi, G. Oliveri, A. Massa
This paper presents an integrated inverse scattering approach to electromagnetic non-destructive evaluation. The method exploits the features of the multi-scaling scheme and the Inexact-Newton techniques for suitably addressing the ill-posedness and nonlinearity of the problem at hand. Preliminary numerical validations are reported to give an indication of the effectiveness of the proposed strategy.
{"title":"On the exploitation of the iterative multi-scaling scheme for the electromagnetic non-destructive evaluation with the Inexact-Newton method","authors":"L. Lizzi, G. Oliveri, A. Massa","doi":"10.1109/URSI-EMTS.2010.5637136","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637136","url":null,"abstract":"This paper presents an integrated inverse scattering approach to electromagnetic non-destructive evaluation. The method exploits the features of the multi-scaling scheme and the Inexact-Newton techniques for suitably addressing the ill-posedness and nonlinearity of the problem at hand. Preliminary numerical validations are reported to give an indication of the effectiveness of the proposed strategy.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133915184","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 : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637195
Mithilesh Kumar, A. Basu, S. Koul
This paper presents a novel scheme for development of an active Ultra-Wide Band (UWB) antenna. A single pulse of 133 ps and amplitude 530 mV peak to peak was obtained using High Electron Mobility Transistor (HEMT) as a generation circuit. This generation circuit was next integrated with a newly proposed UWB planar microstrip antenna. Transmission and reception characteristics of the UWB antenna were measured using a high speed oscilloscope. The short pulse generation circuit and the UWB antenna were fabricated using standard photolithography technique on Neltec soft substrate having εr = 2.2 and thickness =0.254 mm. The design and optimization of the UWB planar microstrip antenna were carried out using CST simulation software and experimental verifications done using Automatic Network Analyzer. The short pulse generation circuit was simulated using Agilent ADS software. The proposed scheme of active UWB antenna shows good agreement between simulation and measured results.
{"title":"Active UWB antenna","authors":"Mithilesh Kumar, A. Basu, S. Koul","doi":"10.1109/URSI-EMTS.2010.5637195","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637195","url":null,"abstract":"This paper presents a novel scheme for development of an active Ultra-Wide Band (UWB) antenna. A single pulse of 133 ps and amplitude 530 mV peak to peak was obtained using High Electron Mobility Transistor (HEMT) as a generation circuit. This generation circuit was next integrated with a newly proposed UWB planar microstrip antenna. Transmission and reception characteristics of the UWB antenna were measured using a high speed oscilloscope. The short pulse generation circuit and the UWB antenna were fabricated using standard photolithography technique on Neltec soft substrate having εr = 2.2 and thickness =0.254 mm. The design and optimization of the UWB planar microstrip antenna were carried out using CST simulation software and experimental verifications done using Automatic Network Analyzer. The short pulse generation circuit was simulated using Agilent ADS software. The proposed scheme of active UWB antenna shows good agreement between simulation and measured results.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133619007","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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