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Support vector machine is a learning technique based on the structural risk minimization principle, and it is also a kind of regression method with good generalization ability. This paper analyses the disadvantage of the nonlinear dynamical systems identification method based on neural networks, and presents a SVM method of modelling and controlling for magnetostrictive material. Simulation result...
When deriving dyadic Green's functions for the spherical structures with uniaxial or gyrotropic anisotropic materials and studying the interaction among the neutrons, ions and atoms, some semi-infinite integrals whose integrant function consists of two spherical Bessel functions and a power function needs to be evaluated. Furthermore, those kinds of integrals are of great importance to the research...
Rectification is a major cause of failure in EMC susceptibility measurements of analog automotive circuits. Especially charge pumping, the change of a DC operating point due to interference, is a harmful effect. In this paper, a methodology is proposed that gives an estimate of the DC voltage shifts caused by conducted interference with relation to frequency, as well as the contributions of each device...
This paper presents a novel symmetric FEM-BEM formulation for solving unbounded electromagnetic problems. The beauties of the proposed method include: (1) symmetry, (2) modularity, (3) non-conformity between FEM and BEM domains, (4) free of internal resonance, and (5) natural and very effective preconditioning schemes that guarantee spectral radius less or equal to one
This paper presents an efficient numerical analysis of the shielding effectiveness of a cylindrical enclosure with an annular ring slot. The problem is initially divided into two parts using the field equivalence principle: one is the half free space with an incident wave and a magnetic current on the aperture surface and the other is the cylindrical enclosure with an extended section of a coaxial...
A novel architecture for waveguide based double-negative (DNG) metamaterials has been proposed. Periodic waveguide structures loaded with double strips printed on dielectric exhibit a DNG passband where both electrical permittivity and magnetic permeability are negative. The printed periodic waveguide structure also shows negative index of refraction and backward wave propagation. The efficient and...
Concrete is a porous, heterogeneous material whose abundant use in numerous applications demands a detailed understanding of its properties. Besides experimental measurements, mathematical models can be useful to investigate its behaviour with respect to frequency, moisture content or other agents. These models can be used in EMC to predict the shielding effectiveness of a concrete structure against...
We present a combined fast multilevel multipole technique combined with a singular value decomposition to evaluate the shielding effectiveness of enclosures with complex fillings up to very high frequencies and limited computer resources. Special preconditioners are proposed, adapted to the problem at hand, to reduce the number of iterations necessary. The accuracy is fully controlled and special...
This work describes the derivation of a state-space formulation for a novel variant of the finite-volume technique. The state-space model is intended to be used in model order reduction (MOR) schemes, which are expected to drastically boost the performance of the method. As a proof of validity of the generated models, a frequency-domain solution of an H-plane discontinuity in a rectangular waveguide...
New spectrum sharing techniques for assuring the EMC of wireless systems have recently been investigated that enable the joint utilization of all orthogonal electromagnetic (EM) transmission resources, including, but not limited to time, frequency, geographic space, modulation/code, and polarization. This multi-dimensional environment is referred to as the transmission hyperspace (TH), a term intended...
In this paper, constrained interpolation profile (CIP) method is applied to Maxwell's equation and the validity of CIP method applied to the equation is confirmed compared with the FDTD method. And as the one of its application, the dependency on CFL (Courant-Friedrich-Lewy) condition and the finite difference accuracy of non advection equation of the absorbing characteristics of one-layer EM-absorber...
Interest in Terahertz science has expanded rapidly in recent years due largely to the advent of fast-pulse laser time domain spectrometers (TDS), which have allowed researchers in a wide variety of fields to explore imaging and spectroscopy applications in this rather unique wavelength regime. However Terahertz spectroscopy dates back to at least the mid 1970's, and for many years was the purview...
This paper provides an overview of the recent developments of finite-volume techniques for time-domain electromagnetic simulations. The distinctive characteristic of finite-volume time-domain (FVTD) algorithms is their applicability in non-Cartesian volume meshes. This allows great geometrical flexibility which is required for most EMC problems. Several aspects of the FVTD method are reviewed, its...
In this paper we present a technique for achieving high resolution in the FDTD. The technique combines model order reduction with subgridding. Such a combination allows one to condense mesh locally and get accurate results using limited number of variables. Moreover the overall time discretization step is longer than in case of the subgridding only. This enables one to perform the simulation quicker...
The CFO voltage and V-t characteristic of 15 kV power distribution insulators are important factors in insulation coordination design of power distribution systems. Insulation designs for distribution feeders are usually based on 1.2/50 mus lightning impulse, while insulator behavior under steep front short duration (SFSD) pulses is not concerned. The generated SFSD impulse in this study has a 60...
The power integrity of the system chip plus chip package determines the RF emission potential and is thus a key quality parameter of complex integrated circuits like microcontrollers for automotive applications. However, modeling and simulation of power integrity and thus electromagnetic emission must be applied as early as possible in the IC design process. This paper presents two approaches: (1)...
Small-sized ferrite cores have commonly been attached to the mains and peripheral cables of electronic devices, but it is hardly known how effectively the cores can suppress EMI currents and how to use the cores in practical application. Hence, theoretical and experimental analyses are carried out to develop an appropriate method for evaluating the EMI suppression capability of the ferrite cores used...
A novel interconnect model is used in the post layout simulation of a transimpedance amplifier working at 10 GB/s data rate. The unnegligible high frequency interconnect effects such as the inductive effect, skin effect, distributed effect, substrate losses, etc. have been considered in the model. Simulation result employing the proposed model is compared with that using conventional foundry provided...
Electromagnetic compatibility (EMC) becomes an increasingly important subject within the IC design process, because more and more market segments demand for low electromagnetic emission (EME) of integrated circuits. Therefore automatic emission model generation tools need to become part of the design flow. In this paper we present an automatic generation procedure of equivalent current sources (ECS)...
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