The Experts below are selected from a list of 61635 Experts worldwide ranked by ideXlab platform
Michel Nakhla - One of the best experts on this subject based on the ideXlab platform.
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Fast transient analysis of Incident Field coupling to multiconductor transmission lines
IEEE Transactions on Electromagnetic Compatibility, 2006Co-Authors: G. Shinh, Anestis Dounavis, Ram Achar, Michel Nakhla, N. Nakhla, I. ErdinAbstract:Due to the rapid surge in operating frequencies and complexity of modern electronic designs, accurate/fast electromagnetic compatibility/interference analysis is becoming mandatory. This paper presents a closed-form SPICE macromodel for fast transient analysis of lossy multiconductor transmission lines in the presence of Incident electromagnetic Fields. In the proposed algorithm, the equivalent sources due to Incident Field coupling have been formulated so as to take an advantage of the recently developed delay extraction based passive transmission line macromodels. Also, a method to incorporate frequency-dependent per-unit-length parameters is presented. The time-domain macromodel is in the form of ordinary differential equations and can be easily included in SPICE like simulators for transient analysis. The proposed algorithm while guaranteeing the stability of the simulation by employing passive transmission line macromodel, provides significant speed-up for the Incident Field coupling analysis of multiconductor transmission line networks, especially with large delay and low losses
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Fast transient analysis of Incident Field coupling to multiconductor transmission lines
2004 10th International Symposium on Antenna Technology and Applied Electromagnetics and URSI Conference, 2004Co-Authors: G. Shinh, I. Erdin, Ram Achar, Michel Nakhla, N. Nakhla, Anestis DounavisAbstract:This paper presents an algorithm for fast transient analysis of multiconductor transmission line interconnects in the presence of Incident Fields. In the proposed approach: (a) The formulation of equivalent external sources due to Incident Fields is independent of the type of the macromodel used to represent the MTL system and can be represented analytically in the time-domain solely based on the information of per-unit-length parameters of the line and Incident Field parameters, (b) An efficient passive macromodel based on delay extraction and closed-form representation is used to describe the distributed nature of the MTL stamp. The time-domain macromodel is in the form of ordinary differential equations and can be easily included in SPICE like simulators for transient analysis. The proposed algorithm, while guaranteeing the stability of the simulation by employing passive macromodels, provides significant speed-up for transmission line networks, especially with large delay and low-losses.
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Circuit simulation of Incident Field coupling to multiconductor transmission lines with frequency-dependent losses
2001 IEEE EMC International Symposium. Symposium Record. International Symposium on Electromagnetic Compatibility (Cat. No.01CH37161), 2001Co-Authors: I. Erdin, Anestis Dounavis, Ram Achar, Michel NakhlaAbstract:A time-domain macromodel for Incident Field coupling to multiconductor transmission lines with frequency-dependent losses is presented. The model, which is based on the closed-form matrix-rational approximation of the exponential matrix describing telegrapher's equations, is in the form of ordinary differential equations and can be easily included in SPICE like simulators for transient analysis. The semi-analytic rational approximation of the forcing functions used in the generation of the model makes it CPU efficient.
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Simulation of high-speed interconnects in a multilayered medium in the presence of Incident Field
IEEE Transactions on Microwave Theory and Techniques, 1998Co-Authors: I. Erdin, Roni Khazaka, Michel NakhlaAbstract:Simulation of high-speed circuits and interconnects in the presence of Incident electromagnetic interference is becoming an important step in the design cycle. An accurate and efficient method for the analysis of Incident Field coupling to traces in inhomogeneous medium is described. The method is based on the application of the physical optics technique. An interconnect circuit simulation stamp is derived. This stamp provides an easy link to current simulators and to recently developed model reduction techniques. In addition to accounting for the inhomogeneity of the medium, this method provides significant computational efficiency improvement over conventional approaches.
Ramani Duraiswami - One of the best experts on this subject based on the ideXlab platform.
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Incident Field recovery for an arbitrary shaped scatterer
International Conference on Acoustics Speech and Signal Processing, 2017Co-Authors: Dmitry N Zotkin, Nail A Gumerov, Ramani DuraiswamiAbstract:Any acoustic sensor disturbs the spatial acoustic Field to certain extent, and a recorded Field is different from a Field that would have existed if a sensor were absent. Recovery of the original (Incident) Field is a fundamental task in spatial audio. For some sensor geometries, the disturbance of the Field by the sensor can be characterized analytically and its influence can be undone; however, for arbitrary-shaped sensor numerical methods have to be employed. In the current work, the sensor influence on the Field is characterized using numerical (specifically, boundary-element) methods, and a framework to recover the Incident Field, either in the plane-wave or in the spherical wave function basis, is developed. Field recovery in terms of the spherical basis allows the generation of a higher-order Ambisonics representation of the spatial audio scene. Experimental results using a complex-shaped scatterer are presented.
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ICASSP - Incident Field recovery for an arbitrary-shaped scatterer
2017 IEEE International Conference on Acoustics Speech and Signal Processing (ICASSP), 2017Co-Authors: Dmitry N Zotkin, Nail A Gumerov, Ramani DuraiswamiAbstract:Any acoustic sensor disturbs the spatial acoustic Field to certain extent, and a recorded Field is different from a Field that would have existed if a sensor were absent. Recovery of the original (Incident) Field is a fundamental task in spatial audio. For some sensor geometries, the disturbance of the Field by the sensor can be characterized analytically and its influence can be undone; however, for arbitrary-shaped sensor numerical methods have to be employed. In the current work, the sensor influence on the Field is characterized using numerical (specifically, boundary-element) methods, and a framework to recover the Incident Field, either in the plane-wave or in the spherical wave function basis, is developed. Field recovery in terms of the spherical basis allows the generation of a higher-order Ambisonics representation of the spatial audio scene. Experimental results using a complex-shaped scatterer are presented.
I. Erdin - One of the best experts on this subject based on the ideXlab platform.
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Fast transient analysis of Incident Field coupling to multiconductor transmission lines
IEEE Transactions on Electromagnetic Compatibility, 2006Co-Authors: G. Shinh, Anestis Dounavis, Ram Achar, Michel Nakhla, N. Nakhla, I. ErdinAbstract:Due to the rapid surge in operating frequencies and complexity of modern electronic designs, accurate/fast electromagnetic compatibility/interference analysis is becoming mandatory. This paper presents a closed-form SPICE macromodel for fast transient analysis of lossy multiconductor transmission lines in the presence of Incident electromagnetic Fields. In the proposed algorithm, the equivalent sources due to Incident Field coupling have been formulated so as to take an advantage of the recently developed delay extraction based passive transmission line macromodels. Also, a method to incorporate frequency-dependent per-unit-length parameters is presented. The time-domain macromodel is in the form of ordinary differential equations and can be easily included in SPICE like simulators for transient analysis. The proposed algorithm while guaranteeing the stability of the simulation by employing passive transmission line macromodel, provides significant speed-up for the Incident Field coupling analysis of multiconductor transmission line networks, especially with large delay and low losses
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Fast transient analysis of Incident Field coupling to multiconductor transmission lines
2004 10th International Symposium on Antenna Technology and Applied Electromagnetics and URSI Conference, 2004Co-Authors: G. Shinh, I. Erdin, Ram Achar, Michel Nakhla, N. Nakhla, Anestis DounavisAbstract:This paper presents an algorithm for fast transient analysis of multiconductor transmission line interconnects in the presence of Incident Fields. In the proposed approach: (a) The formulation of equivalent external sources due to Incident Fields is independent of the type of the macromodel used to represent the MTL system and can be represented analytically in the time-domain solely based on the information of per-unit-length parameters of the line and Incident Field parameters, (b) An efficient passive macromodel based on delay extraction and closed-form representation is used to describe the distributed nature of the MTL stamp. The time-domain macromodel is in the form of ordinary differential equations and can be easily included in SPICE like simulators for transient analysis. The proposed algorithm, while guaranteeing the stability of the simulation by employing passive macromodels, provides significant speed-up for transmission line networks, especially with large delay and low-losses.
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A SPICE model for Incident Field coupling to lossy multiconductor transmission lines
IEEE Transactions on Electromagnetic Compatibility, 2001Co-Authors: I. Erdin, Anestis Dounavis, Ram AcharAbstract:An efficient time-domain macromodel for Incident Field coupling to lossy multiconductor transmission lines is presented. The model takes the form of ordinary differential equations and can be easily included in SPICE like simulators for transient analysis. The model is based on the closed-form matrix-rational approximation of the exponential matrix describing telegrapher's equations and semi-analytic rational approximation of forcing functions.
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Circuit simulation of Incident Field coupling to multiconductor transmission lines with frequency-dependent losses
2001 IEEE EMC International Symposium. Symposium Record. International Symposium on Electromagnetic Compatibility (Cat. No.01CH37161), 2001Co-Authors: I. Erdin, Anestis Dounavis, Ram Achar, Michel NakhlaAbstract:A time-domain macromodel for Incident Field coupling to multiconductor transmission lines with frequency-dependent losses is presented. The model, which is based on the closed-form matrix-rational approximation of the exponential matrix describing telegrapher's equations, is in the form of ordinary differential equations and can be easily included in SPICE like simulators for transient analysis. The semi-analytic rational approximation of the forcing functions used in the generation of the model makes it CPU efficient.
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Simulation of high-speed interconnects in a multilayered medium in the presence of Incident Field
IEEE Transactions on Microwave Theory and Techniques, 1998Co-Authors: I. Erdin, Roni Khazaka, Michel NakhlaAbstract:Simulation of high-speed circuits and interconnects in the presence of Incident electromagnetic interference is becoming an important step in the design cycle. An accurate and efficient method for the analysis of Incident Field coupling to traces in inhomogeneous medium is described. The method is based on the application of the physical optics technique. An interconnect circuit simulation stamp is derived. This stamp provides an easy link to current simulators and to recently developed model reduction techniques. In addition to accounting for the inhomogeneity of the medium, this method provides significant computational efficiency improvement over conventional approaches.
J B Schneider - One of the best experts on this subject based on the ideXlab platform.
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plane waves in fdtd simulations and a nearly perfect total Field scattered Field boundary
IEEE Transactions on Antennas and Propagation, 2004Co-Authors: J B SchneiderAbstract:The total-Field/scattered-Field (TFSF) boundary has been successfully used for a number of years to introduce energy into finite-difference time-domain (FDTD) grids. If the propagation of the Incident Field is grid-aligned, a perfect TFSF implementation can be realized by using an auxiliary one-dimensional FDTD simulation which models propagation of the Incident Field. Here "perfect" implies the Incident Field propagation exactly matches the way in which the Field propagates in the FDTD grid. However, for propagation which is not grid-aligned, no similarly perfect implementation has previously been presented. This work provides a framework for a perfect TFSF boundary for pulsed plane waves which do not propagate in a grid-aligned fashion. To achieve this, homogeneous plane-wave propagation is rigorously quantified. Using this knowledge and a specification of the desired Incident Field, the dispersion relation is used to ascertain the Incident Field at any point in the grid. It is required to account for, unlike in the continuous world, the electric Field, the magnetic Field, and the wavenumber vector not forming a mutually orthogonal set. Group velocity is also considered because of its relevance to the implementation.
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Plane waves in FDTD simulations and a nearly perfect total-Field/scattered-Field boundary
IEEE Transactions on Antennas and Propagation, 2004Co-Authors: J B SchneiderAbstract:The total-Field/scattered-Field (TFSF) boundary has been successfully used for a number of years to introduce energy into finite-difference time-domain (FDTD) grids. If the propagation of the Incident Field is grid-aligned, a perfect TFSF implementation can be realized by using an auxiliary one-dimensional FDTD simulation which models propagation of the Incident Field. Here "perfect" implies the Incident Field propagation exactly matches the way in which the Field propagates in the FDTD grid. However, for propagation which is not grid-aligned, no similarly perfect implementation has previously been presented. This work provides a framework for a perfect TFSF boundary for pulsed plane waves which do not propagate in a grid-aligned fashion. To achieve this, homogeneous plane-wave propagation is rigorously quantified. Using this knowledge and a specification of the desired Incident Field, the dispersion relation is used to ascertain the Incident Field at any point in the grid. It is required to account for, unlike in the continuous world, the electric Field, the magnetic Field, and the wavenumber vector not forming a mutually orthogonal set. Group velocity is also considered because of its relevance to the implementation.
Emil Wolf - One of the best experts on this subject based on the ideXlab platform.
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effects of spatial coherence on the angular distribution of radiant intensity generated by scattering on a sphere
Physical Review Letters, 2010Co-Authors: T A Van Dijk, David G Fischer, Taco D Visser, Emil WolfAbstract:In the analysis of light scattering on a sphere it is implicitly assumed that the Incident Field is spatially fully coherent. However, under usual circumstances the Field is partially coherent. We generalize the partial waves expansion method to this situation and examine the influence of the degree of coherence of the Incident Field on the radiant intensity of the scattered Field in the far zone. We show that when the coherence length of the Incident Field is comparable to, or is smaller than, the radius of the sphere, the angular distribution of the radiant intensity depends strongly on the degree of coherence. The results have implications, for example, for scattering in the atmosphere and colloidal suspensions.
