The Experts below are selected from a list of 22758 Experts worldwide ranked by ideXlab platform
A. Abramowicz - One of the best experts on this subject based on the ideXlab platform.
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Design method for wideband direct-coupled resonator filters with electric or Magnetic Couplings
2015 IEEE International Conference on Microwaves Communications Antennas and Electronic Systems (COMCAS), 2015Co-Authors: Mateusz Żukociński, A. AbramowiczAbstract:The paper presents methodology for designing wideband and ultra-wideband filters with electric (capacitive) or Magnetic (inductive) direct Couplings based on closed-form formulas. For given filter specifications (required frequency characteristic, filter center frequency, bandwidth) the method gives filter parameters as a set of resonant frequencies, coupling factors, external quality factors and characteristic impedances of the filter resonators. The method is based on analysis of circuit models of filters with only-electric and only-Magnetic direct Couplings. Numerical experiments of the circuit models allowed to study properties of such filters and to build effective design method. In this paper method for designing 5th order filters is described in details. High accuracy of the presented method is also addressed.
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Wideband and UWB filters with complementary Couplings
2012 Asia Pacific Microwave Conference Proceedings, 2012Co-Authors: M. Zukocinski, A. AbramowiczAbstract:New type of direct-coupled resonator filter with complementary Couplings is analyzed and described. Complementary Couplings are capacitive (electric) and inductive (Magnetic) Couplings used together in one filter. Capacitive and inductive effects complement each other in terms of frequency dependence. That is why complementary Couplings filter behaves exactly like classical filter with ideal frequency independent Couplings. The new type of filter gives strictly Chebyshev frequency response in wideband and ultra-wideband applications what is unique in other filter realizations. This phenomenon is explained by modeling direct-coupled resonator filters with real admittance inverters. A novel microstrip wideband filter with complementary Couplings is proposed. The 5th order, 2.0 GHz center frequency and 600 MHz bandwidth example is presented.
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New model of coupled transmission lines
IEEE Transactions on Microwave Theory and Techniques, 1995Co-Authors: A. AbramowiczAbstract:The paper shows that an existing description of coupled transmission lines is inconsistent and proposes a new model based truly on the mutual coupling concept. In the existing formulation a series electric coupling and parallel Magnetic coupling are combined. In the new formulation the parallel electric and Magnetic Couplings as well as series electric and Magnetic Couplings are used. The obtained model of coupled lines has physical background related to the odd and even type of propagation and agrees with the practical results.
Abderrezak Rezzoug - One of the best experts on this subject based on the ideXlab platform.
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Comparison of transient performances for synchronous and eddy-current torque couplers
2016 XXII International Conference on Electrical Machines (ICEM), 2016Co-Authors: Thierry Lubin, Smail Mezani, Julien Fontchastagner, Abderrezak RezzougAbstract:In this paper, we compare the transient performances of synchronous and eddy-current Magnetic Couplings. Based on a two-dimensional approximation for the Magnetic field distribution, closed-form expressions for the transmitted torque are first presented. The torque formulas are then used to study the transient responses during a start-up and for a sudden application of a load torque. Simulation results are compared with those obtained from tests. It is shown that overload torque condition leads to the loss of synchronism for the synchronous coupling. A discussion about the benefits and the disadvantages of each topology in terms of transient responses is given.
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Simple Analytical Expressions for the Force and Torque of Axial Magnetic Couplings
IEEE Transactions on Energy Conversion, 2012Co-Authors: Thierry Lubin, Smail Mezani, Abderrezak RezzougAbstract:In this paper, a theoretical analysis of an axial Magnetic coupling is presented, leading to new closed-form expressions for the Magnetic axial force and torque. These expressions are obtained by using a 2-D approximation of the Magnetic coupling geometry (mean radius model). The analytical method is based on the solution of Laplace's and Poisson's equations by the separation of variables method. The influence of geometrical parameters such as number of pole pairs and air-gap length is studied. Magnetic field distribution, axial force, and torque computed with the proposed 2-D analytical model are compared with those obtained from 3-D finite elements simulations and experimental results.
Thierry Lubin - One of the best experts on this subject based on the ideXlab platform.
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Comparison of transient performances for synchronous and eddy-current torque couplers
2016 XXII International Conference on Electrical Machines (ICEM), 2016Co-Authors: Thierry Lubin, Smail Mezani, Julien Fontchastagner, Abderrezak RezzougAbstract:In this paper, we compare the transient performances of synchronous and eddy-current Magnetic Couplings. Based on a two-dimensional approximation for the Magnetic field distribution, closed-form expressions for the transmitted torque are first presented. The torque formulas are then used to study the transient responses during a start-up and for a sudden application of a load torque. Simulation results are compared with those obtained from tests. It is shown that overload torque condition leads to the loss of synchronism for the synchronous coupling. A discussion about the benefits and the disadvantages of each topology in terms of transient responses is given.
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Efficient Design Using Successive Analytical Subproblems Method: Application to Axial Magnetic Couplings
IEEE Transactions on Magnetics, 2015Co-Authors: Julien Fontchastagner, Frederic Messine, Thierry Lubin, Smail MezaniAbstract:We propose a simple, but efficient method for design problems. Instead of using directly, a heavy numerical code in an optimization process, we successively define some approximated subproblems because of an appropriate analytical model. These subproblems can then be solved exactly by a deterministic global optimization solver and the procedure is updated until the approximation matches a 3-D FEM computation. The method is applied to an axial Magnetic coupling. Comparative results show the effectiveness of this approach, and real design cases are studied because of this method.
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Simple Analytical Expressions for the Force and Torque of Axial Magnetic Couplings
IEEE Transactions on Energy Conversion, 2012Co-Authors: Thierry Lubin, Smail Mezani, Abderrezak RezzougAbstract:In this paper, a theoretical analysis of an axial Magnetic coupling is presented, leading to new closed-form expressions for the Magnetic axial force and torque. These expressions are obtained by using a 2-D approximation of the Magnetic coupling geometry (mean radius model). The analytical method is based on the solution of Laplace's and Poisson's equations by the separation of variables method. The influence of geometrical parameters such as number of pole pairs and air-gap length is studied. Magnetic field distribution, axial force, and torque computed with the proposed 2-D analytical model are compared with those obtained from 3-D finite elements simulations and experimental results.
Smail Mezani - One of the best experts on this subject based on the ideXlab platform.
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Comparison of transient performances for synchronous and eddy-current torque couplers
2016 XXII International Conference on Electrical Machines (ICEM), 2016Co-Authors: Thierry Lubin, Smail Mezani, Julien Fontchastagner, Abderrezak RezzougAbstract:In this paper, we compare the transient performances of synchronous and eddy-current Magnetic Couplings. Based on a two-dimensional approximation for the Magnetic field distribution, closed-form expressions for the transmitted torque are first presented. The torque formulas are then used to study the transient responses during a start-up and for a sudden application of a load torque. Simulation results are compared with those obtained from tests. It is shown that overload torque condition leads to the loss of synchronism for the synchronous coupling. A discussion about the benefits and the disadvantages of each topology in terms of transient responses is given.
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Efficient Design Using Successive Analytical Subproblems Method: Application to Axial Magnetic Couplings
IEEE Transactions on Magnetics, 2015Co-Authors: Julien Fontchastagner, Frederic Messine, Thierry Lubin, Smail MezaniAbstract:We propose a simple, but efficient method for design problems. Instead of using directly, a heavy numerical code in an optimization process, we successively define some approximated subproblems because of an appropriate analytical model. These subproblems can then be solved exactly by a deterministic global optimization solver and the procedure is updated until the approximation matches a 3-D FEM computation. The method is applied to an axial Magnetic coupling. Comparative results show the effectiveness of this approach, and real design cases are studied because of this method.
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Simple Analytical Expressions for the Force and Torque of Axial Magnetic Couplings
IEEE Transactions on Energy Conversion, 2012Co-Authors: Thierry Lubin, Smail Mezani, Abderrezak RezzougAbstract:In this paper, a theoretical analysis of an axial Magnetic coupling is presented, leading to new closed-form expressions for the Magnetic axial force and torque. These expressions are obtained by using a 2-D approximation of the Magnetic coupling geometry (mean radius model). The analytical method is based on the solution of Laplace's and Poisson's equations by the separation of variables method. The influence of geometrical parameters such as number of pole pairs and air-gap length is studied. Magnetic field distribution, axial force, and torque computed with the proposed 2-D analytical model are compared with those obtained from 3-D finite elements simulations and experimental results.
Roberto Sorrentino - One of the best experts on this subject based on the ideXlab platform.
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Design and Multiphysics Analysis of Direct and Cross-Coupled SIW Combline Filters Using Electric and Magnetic Couplings
IEEE Transactions on Microwave Theory and Techniques, 2015Co-Authors: Stefano Sirci, Miguel Ángel Sánchez-soriano, Jorge D. Martı´nez, Vicente E. Boria, Fabrizio Gentili, Wolfgang Bösch, Roberto SorrentinoAbstract:In this paper, combline substrate integrated waveguide (SIW) filters using electric and Magnetic Couplings are thoroughly studied. Thus, a negative coupling scheme consisting on an open-ended coplanar probe is proposed and analyzed in detail. Several in-line 3-pole filters at C-band are designed, manufactured and measured showing how the presented approach can be used for implementing direct Couplings while enabling an important size reduction and improved spurious-free band compared to conventional Magnetic irises. A fully-packaged quasi-elliptic 4-pole filter is also designed at 5.75 GHz showing how the negative coupling structure can be used for introducing transmission zeros by means of cross-Couplings between non-adjacent resonators. Finally, average and peak power handling capabilities of these filters have been also analyzed from a multiphysics point of view. Measured results validate the theoretical predictions confirming that combline SIW filters can handle significant levels of continuous and peak power, providing at the same time easy integration, compact size and advanced filtering responses.
