Pub Date : 2007-11-21DOI: 10.1109/ICEAA.2007.4387394
R. Remis
In this paper we present a Krylov subspace method to efficiently compute the low-frequency response of multiconductor transmission lines. Through a Lanczos-type algorithm we generate so-called spectral Lanczos decomposition approximations on an entire frequency interval of interest. Low frequencies are approximated first, since we use the inverse of the transmission line system matrix in the Lanczos algorithm. Although this inverse is not a sparse matrix, computing its action on a vector still requires an order N amount of work, where N is the total number of unknowns. Moreover, the inverse is a so-called J-symmetric matrix because of reciprocity. This property is exploited in the Lanczos algorithm and approximations are constructed via a three-term recurrence relation. The overall algorithm is therefore very efficient.
{"title":"An Efficient Krylov Subspace Method to Simulate the Low-Frequency Response of Multiconductor Transmission Lines","authors":"R. Remis","doi":"10.1109/ICEAA.2007.4387394","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387394","url":null,"abstract":"In this paper we present a Krylov subspace method to efficiently compute the low-frequency response of multiconductor transmission lines. Through a Lanczos-type algorithm we generate so-called spectral Lanczos decomposition approximations on an entire frequency interval of interest. Low frequencies are approximated first, since we use the inverse of the transmission line system matrix in the Lanczos algorithm. Although this inverse is not a sparse matrix, computing its action on a vector still requires an order N amount of work, where N is the total number of unknowns. Moreover, the inverse is a so-called J-symmetric matrix because of reciprocity. This property is exploited in the Lanczos algorithm and approximations are constructed via a three-term recurrence relation. The overall algorithm is therefore very efficient.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125376406","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 : 2007-11-21DOI: 10.1109/ICEAA.2007.4387490
M. Bialkowski, J. Encinar
The paper gives an overview of research activities on reflectarrays. It revisits the original concept of reflectarray and describes how its realization evolved over the last three decades. Fixed-beam and electronically steered varieties of this antenna are considered. Special considerations are devoted to a slot-coupled double-sided microstrip interconnect for use in reflectarrays and transmitarrays.
{"title":"Reflectarrays: Potentials and Challenges","authors":"M. Bialkowski, J. Encinar","doi":"10.1109/ICEAA.2007.4387490","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387490","url":null,"abstract":"The paper gives an overview of research activities on reflectarrays. It revisits the original concept of reflectarray and describes how its realization evolved over the last three decades. Fixed-beam and electronically steered varieties of this antenna are considered. Special considerations are devoted to a slot-coupled double-sided microstrip interconnect for use in reflectarrays and transmitarrays.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125665733","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 : 2007-11-21DOI: 10.1109/ICEAA.2007.4387382
O. O. Sy, J. A. H. M. Vaessen, M. V. van Beurden, A.G. Tijliuis, B. Michielsen
A stochastic approach is presented to statistically characterize uncertainties in electromagnetic interactions. A stochastically undulating thin wire over a perfectly conducting ground plane is studied. The aim of this paper is to present methods to compute the statistical moments of the voltage induced by a deterministic incident field. Three methods have been developed to compute these moments: a quadrature method, a perturbation approach and a Monte-Carlo method.
{"title":"Probabilistic Study of the Coupling between Deterministic Electromagnetic Fields and a Stochastic Thin-Wire over a PEC Plane","authors":"O. O. Sy, J. A. H. M. Vaessen, M. V. van Beurden, A.G. Tijliuis, B. Michielsen","doi":"10.1109/ICEAA.2007.4387382","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387382","url":null,"abstract":"A stochastic approach is presented to statistically characterize uncertainties in electromagnetic interactions. A stochastically undulating thin wire over a perfectly conducting ground plane is studied. The aim of this paper is to present methods to compute the statistical moments of the voltage induced by a deterministic incident field. Three methods have been developed to compute these moments: a quadrature method, a perturbation approach and a Monte-Carlo method.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129330010","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 : 2007-11-21DOI: 10.1109/ICEAA.2007.4387352
E. Surducan, D. Iancu, V. Surducair, S. Stanley
In this paper we present a multi band antenna capable of supporting DVB-H, GSM and WCDMA communication protocols. The frequency bands covered by the antenna are: DVB-H (470-780 MHz), GSM-I(880-915 / 925-960 MHz), GSM-II (1710-1785 / 1805-1880 MHz), and WCDMA Band I (1920-1980 / 2110-2170 MHz). The antenna is part of the Software Defined Radio platform designed by Sandbridge Technologies.
{"title":"Multi-band antennas for SDR wireless handset application","authors":"E. Surducan, D. Iancu, V. Surducair, S. Stanley","doi":"10.1109/ICEAA.2007.4387352","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387352","url":null,"abstract":"In this paper we present a multi band antenna capable of supporting DVB-H, GSM and WCDMA communication protocols. The frequency bands covered by the antenna are: DVB-H (470-780 MHz), GSM-I(880-915 / 925-960 MHz), GSM-II (1710-1785 / 1805-1880 MHz), and WCDMA Band I (1920-1980 / 2110-2170 MHz). The antenna is part of the Software Defined Radio platform designed by Sandbridge Technologies.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122530593","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 : 2007-11-21DOI: 10.1109/ICEAA.2007.4387482
C. Furse, R. Harrison, F. Solzbacher
Communication systems for implantable medical devices are rapidly advancing. Cardiac, optical, neurological and auditory devices all utilize this technology. Miniaturized antennas and inductive coupling systems provide the radio interface between air and the implantable device. Miniaturized electronics that can be seamlessly integrated with the medical device provide electrical and communication interfaces. Power transfer ("link budget") and deposition (SAR) issues continue to be explored and better understood. This paper describes advances in each of these system components. The challenges of miniature biocompatible packaging, patient variability, and utilization of new materials was discussed.
{"title":"Recent Advances in BioMedical Telemetry","authors":"C. Furse, R. Harrison, F. Solzbacher","doi":"10.1109/ICEAA.2007.4387482","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387482","url":null,"abstract":"Communication systems for implantable medical devices are rapidly advancing. Cardiac, optical, neurological and auditory devices all utilize this technology. Miniaturized antennas and inductive coupling systems provide the radio interface between air and the implantable device. Miniaturized electronics that can be seamlessly integrated with the medical device provide electrical and communication interfaces. Power transfer (\"link budget\") and deposition (SAR) issues continue to be explored and better understood. This paper describes advances in each of these system components. The challenges of miniature biocompatible packaging, patient variability, and utilization of new materials was discussed.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122329387","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 : 2007-11-21DOI: 10.1109/ICEAA.2007.4387427
M. Botha, T. Rylander
In computational electromagnetics, when using the method of moments (MoM) to solve surface integral equations, numerical integration of near-singularities is required. Here, a brief overview of a theoretical error analysis for the recently proposed Arcsinh transformation-based quadrature scheme, generalized to curvilinear triangle domains, is given. Gaussian product rule quadrature is also considered in this context. Accurate error prediction is demonstrated. Insights gained into the error mechanisms of the Arcsinh scheme enable one to use it with confidence where applicable. Such situations are mild near-singularities and especially, extreme near-singularities. These occur within the MoM.
{"title":"Error analysis of singularity cancellation quadrature on curvilinear triangles","authors":"M. Botha, T. Rylander","doi":"10.1109/ICEAA.2007.4387427","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387427","url":null,"abstract":"In computational electromagnetics, when using the method of moments (MoM) to solve surface integral equations, numerical integration of near-singularities is required. Here, a brief overview of a theoretical error analysis for the recently proposed Arcsinh transformation-based quadrature scheme, generalized to curvilinear triangle domains, is given. Gaussian product rule quadrature is also considered in this context. Accurate error prediction is demonstrated. Insights gained into the error mechanisms of the Arcsinh scheme enable one to use it with confidence where applicable. Such situations are mild near-singularities and especially, extreme near-singularities. These occur within the MoM.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"143 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122346307","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 : 2007-11-21DOI: 10.1109/ICEAA.2007.4387319
H. Karkhaneh, T. Sadeghpour, A. Ghorbani, R. Alhameed
This paper represents a new adaptive method to model the nonlinearity of power amplifiers(PAs) with memory effects based on Wiener approach and also adaptive predistorter to counterbalance the AM/AM and AM/PM nonlinear effects of the transmitter power amplifier is proposed by Hammerstein approach. Finally we consider the effectiveness of proposed method on performance of OFDM signal as the wideband system by reduction of distortion. It is confirmed by computer simulation that proposed approach produces a faster convergence speed than the previous adaptive predistortion technique.
{"title":"Modeling and Linearization Method for Nonlinear Power Amplifier with Memory Effect for Wideband Application","authors":"H. Karkhaneh, T. Sadeghpour, A. Ghorbani, R. Alhameed","doi":"10.1109/ICEAA.2007.4387319","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387319","url":null,"abstract":"This paper represents a new adaptive method to model the nonlinearity of power amplifiers(PAs) with memory effects based on Wiener approach and also adaptive predistorter to counterbalance the AM/AM and AM/PM nonlinear effects of the transmitter power amplifier is proposed by Hammerstein approach. Finally we consider the effectiveness of proposed method on performance of OFDM signal as the wideband system by reduction of distortion. It is confirmed by computer simulation that proposed approach produces a faster convergence speed than the previous adaptive predistortion technique.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125717915","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 : 2007-11-21DOI: 10.1109/ICEAA.2007.4387284
B. Stupfel, M. Mognot
On account of the CT, this partitioning of D1 minimizes the dimension of the admittance matrices. Also, uniqueness is ensured at each step. Obviously, the bottleneck of this technique is the computation - and, if needed, the memory storage - of matrices Yi. However, we may replace one or several of them by approximate matrices, derived from the exact ones computed as indicated above, provided they satisfy (13) that ensures the uniqueness of the solutions in Omegai. Also, the fact that non diagonal blocks in Yi may be rank-deficient can be of interest to compress these matrices. Finally, the problem may be solved by employing a local DDM on the largest interface only, the subproblems in the subdomains located on each side of this interface being solved exactly via the technique presented.
{"title":"A rapidly convergent hybrid domain decomposition method for the solution of large 3D scattering problems","authors":"B. Stupfel, M. Mognot","doi":"10.1109/ICEAA.2007.4387284","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387284","url":null,"abstract":"On account of the CT, this partitioning of D1 minimizes the dimension of the admittance matrices. Also, uniqueness is ensured at each step. Obviously, the bottleneck of this technique is the computation - and, if needed, the memory storage - of matrices Yi. However, we may replace one or several of them by approximate matrices, derived from the exact ones computed as indicated above, provided they satisfy (13) that ensures the uniqueness of the solutions in Omegai. Also, the fact that non diagonal blocks in Yi may be rank-deficient can be of interest to compress these matrices. Finally, the problem may be solved by employing a local DDM on the largest interface only, the subproblems in the subdomains located on each side of this interface being solved exactly via the technique presented.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126625428","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 : 2007-11-21DOI: 10.1109/ICEAA.2007.4387316
G. Antonini
This paper presents a new methodology for the transient analysis of lossy transmission lines. The proposed model is derived from the solution the Telegrapher's equations in the framework of the Sturm-Liouville theory. The open-end impedance matrix is expressed in a series form as sum of infinite rational functions, derived by the series form of the Green's function. The pole-residue rational model can then be synthesized in an equivalent circuit or converted into a state space model which can be easily interfaced with circuit Spice-like solvers. The numerical results confirm the robustness of the proposed transmission line modelling technique.
{"title":"A Green's function-based method for the transient analysis of transmission lines","authors":"G. Antonini","doi":"10.1109/ICEAA.2007.4387316","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387316","url":null,"abstract":"This paper presents a new methodology for the transient analysis of lossy transmission lines. The proposed model is derived from the solution the Telegrapher's equations in the framework of the Sturm-Liouville theory. The open-end impedance matrix is expressed in a series form as sum of infinite rational functions, derived by the series form of the Green's function. The pole-residue rational model can then be synthesized in an equivalent circuit or converted into a state space model which can be easily interfaced with circuit Spice-like solvers. The numerical results confirm the robustness of the proposed transmission line modelling technique.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114911792","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 : 2007-11-21DOI: 10.1109/ICEAA.2007.4387358
A. Nandgaonkar, S. Deosarkar
Microstrip Antennas (MSAs) have several advantages, including that they are light weight and small volume and that they can be made conformal to the host surface. In addition, MSAs are manufactured using printed circuit technology, so that mass production can be achieved at a low cost. In comparison to traditional antenna elements, however, the electrical performance of the basic microstrip antenna suffers from a number of serious drawbacks, e.g. narrow bandwidth; high feed network losses, poor cross polarization, and low power handling capacity. The major disadvantage of the microstrip-patch antenna is its inherently narrow impedance bandwidth of only a couple of percent. Intensive research is going on to develop bandwidth-enhancement techniques by keeping its size as small as possible. Accordingly, increasing the bandwidth of the MSA has been a primary goal of research in the field. We present here a compact two-layer electromagnetically coupled patch antenna with an impedance bandwidth of 35%. The radiation efficiency is obtained 90% in the operating band. The designed antenna is right-hand circularly polarized and operates in the 2.4 GHz ISM-band frequency The proposed structure has been initially optimized using IE3D software followed by experimental verification on Agilent Vector Network Analyzer, E5062A.
{"title":"Design of High Gain Two-Layer Electromagnetically Coupled Patch Antenna in the ISM Band","authors":"A. Nandgaonkar, S. Deosarkar","doi":"10.1109/ICEAA.2007.4387358","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387358","url":null,"abstract":"Microstrip Antennas (MSAs) have several advantages, including that they are light weight and small volume and that they can be made conformal to the host surface. In addition, MSAs are manufactured using printed circuit technology, so that mass production can be achieved at a low cost. In comparison to traditional antenna elements, however, the electrical performance of the basic microstrip antenna suffers from a number of serious drawbacks, e.g. narrow bandwidth; high feed network losses, poor cross polarization, and low power handling capacity. The major disadvantage of the microstrip-patch antenna is its inherently narrow impedance bandwidth of only a couple of percent. Intensive research is going on to develop bandwidth-enhancement techniques by keeping its size as small as possible. Accordingly, increasing the bandwidth of the MSA has been a primary goal of research in the field. We present here a compact two-layer electromagnetically coupled patch antenna with an impedance bandwidth of 35%. The radiation efficiency is obtained 90% in the operating band. The designed antenna is right-hand circularly polarized and operates in the 2.4 GHz ISM-band frequency The proposed structure has been initially optimized using IE3D software followed by experimental verification on Agilent Vector Network Analyzer, E5062A.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133600871","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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