Analysis and Numerical Modeling of Inductively Coupled Antenna Systems.
Technische Universität, Darmstadt
[Ph.D. Thesis], (2010)
Peter Scholz, PhD thesis, 2010 -
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|Item Type:||Ph.D. Thesis|
|Title:||Analysis and Numerical Modeling of Inductively Coupled Antenna Systems|
This work focuses on the analysis and design of Inductive Power Transfer (IPT) antenna systems. Practical applications for IPT systems include a wireless powering of mobile devices in consumer electronics or Radio Frequency Identiﬁcation (RFID) systems in logistics. The physical relevant properties of the antenna systems such as an accurate inductance computation or a precise modeling of skin and proximity effects are extracted by means of numerical techniques. At the same time, an equivalent network description based on the transformer concept is enabled by representing the antennas via reduced circuit models, which are obtained by specialized parameter ﬁtting techniques. The numerical simulations used in this thesis are based on the Partial Element Equivalent Circuit (PEEC) method. The PEEC method is especially appropriate for IPT antenna systems, because it allows efﬁcient meshing techniques in case of long and thin conductors and provides a transformation of the electromagnetic coupling effects to the network domain. Furthermore, neglecting the retardation effects is traditionally fulﬁlled by the PEEC method when quasi-stationary assumptions of the Maxwell’s equations are used. This is beneﬁcial for IPT systems, since the simulation time is reduced while the errors are kept sufﬁciently small. First, some fundamental concepts of electrodynamic effects are reviewed in this work. A new Lorenz-Quasi-Static (LQS) formulation is derived while its integration into well established techniques is shown. After presenting the fundamental concepts of IPT systems, the PEEC method is derived in a slightly modiﬁed way compared to the standard formulation in order to handle the different approximation techniques in a uniﬁed notation. Afterwards, the inﬂuence of parameter tolerances on the system behavior is analyzed by applying the adjoint sensitivity analysis to the PEEC method with a special focus on skin-effect problems. The presented system modeling approach is conﬁrmed via measurements and Finite Element Method (FEM) simulations for a Printed Spiral Coil (PSC) system often used in RFID applications. By means of the optimized PEEC method, a remarkable speedup can be gained when compared with FEM simulations whereas the obtained errors typically do not exceed a few percent.
|Place of Publication:||Darmstadt|
|Uncontrolled Keywords:||IPT, inductive power transfer, resonant energy transfer, resonant inductive coupling, electrodynamic inductive effect, antenna systems, near-field antennas, numerical simulation, PEEC, partial element equivalent circuit, RFID, radio frequency identification, PSC, printed spiral coil, quasi-static fields, skin effect, proximity effect, eddy currents, sensitivity analysis, adjoint sensitivity analysis, equivalent circuit, resonance|
|Classification DDC:||500 Naturwissenschaften und Mathematik > 530 Physik
600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
500 Naturwissenschaften und Mathematik > 510 Mathematik
|Divisions:||18 Department of Electrical Engineering and Information Technology > Institute for Computational Electromagnetics
18 Department of Electrical Engineering and Information Technology
|Date Deposited:||09 Dec 2010 08:09|
|Last Modified:||16 Sep 2015 08:26|
|Referees:||Weiland, Prof. Dr.- Thomas and Schuhmann, Prof. Dr.- Rolf|
|Refereed:||30 November 2010|