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.2007.4387427
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.2007.4387482
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.2007.4387352
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.2007.4387382
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.2007.4387284
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.2007.4387398
V.M. Babicli
Let an incident wave propagates in a medium with wave-speed c1 and illuminates a convex interface to a medium with propagation speed c2, c2 > c1 . Let at some point O an incident ray meets an interface under critical reflection angle, then such a point looks like a source of an interference head wave which propagates in the first medium along the interface with the speed c2. The wave field in a vicinity of O is rather complicated. In the paper, we discuss its high-frequency asymptotics.
{"title":"On asymptotics of a wave field near the origin of an interference head wave","authors":"V.M. Babicli","doi":"10.1109/ICEAA.2007.4387398","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387398","url":null,"abstract":"Let an incident wave propagates in a medium with wave-speed c<sub>1</sub> and illuminates a convex interface to a medium with propagation speed c<sub>2</sub>, c<sub>2</sub> > c<sub>1</sub> . Let at some point O an incident ray meets an interface under critical reflection angle, then such a point looks like a source of an interference head wave which propagates in the first medium along the interface with the speed c<sub>2</sub>. The wave field in a vicinity of O is rather complicated. In the paper, we discuss its high-frequency asymptotics.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"47 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":"132460121","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.2007.4387264
R. Villarino, G. Junkin, J. Parrón, J. M. González-Arbesú
Artificial magnetic surfaces have interesting applications in antenna design where one wants to replace, over a limited frequency range, electric conducting surfaces with magnetic equivalents. One of the many challenges in constructing such a surface is that of miniaturizing the resonator elements making up the structure whilst at the same time maintaining a reasonable bandwidth and a tolerable level of dielectric and copper losses. In this paper we present some novel structures, fabricated using chemical etching techniques, which have only 6.5% of the area of a capacitive loaded loop (CLL) and less than 30% of the area of spiral resonators and have measured return losses of less than 1.5 dB.
{"title":"Smaller resonators for artificial magnetic surfaces","authors":"R. Villarino, G. Junkin, J. Parrón, J. M. González-Arbesú","doi":"10.1109/ICEAA.2007.4387264","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387264","url":null,"abstract":"Artificial magnetic surfaces have interesting applications in antenna design where one wants to replace, over a limited frequency range, electric conducting surfaces with magnetic equivalents. One of the many challenges in constructing such a surface is that of miniaturizing the resonator elements making up the structure whilst at the same time maintaining a reasonable bandwidth and a tolerable level of dielectric and copper losses. In this paper we present some novel structures, fabricated using chemical etching techniques, which have only 6.5% of the area of a capacitive loaded loop (CLL) and less than 30% of the area of spiral resonators and have measured return losses of less than 1.5 dB.","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":"123983746","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.2007.4387407
J.J.H. Wang, D. J. Triplett
This paper reports continued development of an ultra-broadband smart beam-steering circular array antenna with parasitically excited surface waveguides for low cost. The array has a low profile and is conformable to platforms, with a directivity of 5 to 10 dBi. Its steered beam and null cover full 360deg azimuth angles. Significant progress has been made in expanding the array's instantaneous bandwidth from 20-250 MHz to about 1000 MHz, which is an octaval bandwidth of 2:1 over the operating range of 1-2 GHz.
{"title":"Low-Profile Conformal Circular Beam-Steering Array with Ultra-Broad Instantaneous Bandwidth","authors":"J.J.H. Wang, D. J. Triplett","doi":"10.1109/ICEAA.2007.4387407","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387407","url":null,"abstract":"This paper reports continued development of an ultra-broadband smart beam-steering circular array antenna with parasitically excited surface waveguides for low cost. The array has a low profile and is conformable to platforms, with a directivity of 5 to 10 dBi. Its steered beam and null cover full 360deg azimuth angles. Significant progress has been made in expanding the array's instantaneous bandwidth from 20-250 MHz to about 1000 MHz, which is an octaval bandwidth of 2:1 over the operating range of 1-2 GHz.","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":"121280303","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.2007.4387347
G. Granet, I. Fenniche, K. Edee, J. Plumey, E. Jehamy, M. Ney
This paper concerns a modal method for designing metal-plate lens structures. The method is based on coordinate transformation and the use of Maxwell's equations written under the covariant form. Furthermore the lens is considered as a medium with discontinuities described by Dirac Delta functions. We illustrate the method by showing the formation of the focus for various incident waves.
{"title":"New method for analysis of constrained metal plate lens","authors":"G. Granet, I. Fenniche, K. Edee, J. Plumey, E. Jehamy, M. Ney","doi":"10.1109/ICEAA.2007.4387347","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387347","url":null,"abstract":"This paper concerns a modal method for designing metal-plate lens structures. The method is based on coordinate transformation and the use of Maxwell's equations written under the covariant form. Furthermore the lens is considered as a medium with discontinuities described by Dirac Delta functions. We illustrate the method by showing the formation of the focus for various incident waves.","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":"121369414","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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