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Orthonormal vector fitting is a robust method for broadband macromodeling of frequency domain responses. The use of orthonormal rational basis functions makes the conditioning of the system equations less sensitive to the initial pole specification when compared with the classical Vector Fitting procedure. This paper presents a time domain generalization of the technique to compute broadband rational...
In this paper an electrothermal model of the power LED dedicated for SPICE is proposed. In this model electrical, thermal and optical properties of the considered device are taken into account. The description of the model and some results of the experimental verification of this model are presented for two types of power LEDS: LXHL‐BW03 and LXHL‐LW3C produced by Lumileds. A good agreement between...
Modelling of an interdigital sensor‐based sensing system for the detection of dangerous contaminated marine biotoxin in seafood has been carried out. Three interdigital sensors having new electrode configurations have been analysed using COMSOL Multiphysics. All sensors were designed to have an equal number of electrodes with the same sensing area. Based on the maximum sensitivity, the best electrode...
In this work, the coplanar stripline (CPS) and its discontinuities: open‐end, short‐end, gaps and resonator have been modeled. New integral equations for the electrical field components are formulated, in the spectral domain, using an exact dyadic Green's function, applied to the CPS structure. The use of this form of Green's function allows the consideration of the effects of the dielectric losses,...
We present an accurate modeling technique that exploits standard space mapping (SM) as a trend function and the correction layer implemented with kriging. The kriging process allows us to efficiently utilize all available fine model data (not possible in the standard SM approach) and to obtain accuracy better than both the SM and recently published combinations of SM and radial basis function interpolation...
Electromagnetic forming is achieved by a system consisting of an equipment, a tool (coil) and a workpiece. The success of the deformation process depends on the equipment's parameters, the tool characteristics and the properties of the workpiece material. Finite element software FLUX2D was used for electromagnetic parameter simulation in the case of a device with flat spiral coil, used for the following...
We have simulated the capacitance versus voltage characteristics (C‐V) of metal‐ferroelectric‐gallium nitride (GaN metal‐ferroelectric‐semiconductor) structures and found useful design rules for improving the devices' performance. The thickness effects of ferroelectric film on the C‐V are studied. When the ferroelectric Pb(Zr, Ti)O3 thickness is no more than 100 nm, the GaN metal‐ferroelectric‐semiconductor...
The aim of this work is to present a circuit model to analyze and design ultra wideband (UWB) radars for the remote monitoring of breath activity. The model includes the impulse signal source, the transceiver antenna, the transmission medium, and the human thorax. First of all, the proposed model has been validated by comparing its responses with those achieved both numerically, with a commercial...
This paper presents application of differential equations in modelling and simulation tests of water supply network pumps drive system together with powered water supply pipelines. The description is preceded with an analysis of practically applicable mathematical models representing drive systems with induction motors and PWM converter. Models of electric devices and their elements, from the viewpoint...
A technique for accurate modeling of microwave components is presented. Our methodology exploits a recently introduced shape‐preserving response prediction (SPRP) technology, which is adopted here to work directly with electromagnetic simulation data of the device under consideration. Unlike in original SPRP, no low‐fidelity model is used, which simplifies implementation and makes our method applicable...
This work introduces a novel time‐domain numerical simulator of integrated optical waveguides. Only solutions of two scalar Helmholtz‐equations are used in the evaluation of electric and magnetic Hertzian‐potentials that yields the electromagnetic field in the time domain, and the frequency response by the discrete Fourier transform. All the field components are obtained directly from the scalar potentials,...
We present a physically based, accurate model of the direct tunneling gate current of nanoscale metal‐oxide‐semiconductor field‐effect transistors considering quantum mechanical effects. Effect of wave function penetration into the gate dielectric is also incorporated. When electrons tunnel from the metal oxide semiconductor inversion layer to the gate, the eigenenergies of the quasi‐bound states...
In this paper, a probe‐fed rectangular microstrip patch antenna with metallic frequency selective surface as superstrate has been analyzed and simulated at terahertz frequency. In addition to this, a novel technique has been proposed to predict the directivity of the antenna at submillimeter and terahertz waves where far‐field measurement is a challenging task. Moreover, the effect of the size of...
In this paper, a computer simulation of the salient poles synchronous machine (SPSM) is presented. This simulation employs a modeling based on the machine self and mutual inductance curves, determined from a methodology, which is also presented here. This methodology applies the volt–ampere method in a first experimental stage, where the machine currents and voltages are oscillographied, with its...
A specific generalized scattering matrix (GSM) approach to the analysis of a piecewise homogeneous E‐plane waveguide junction with plane interfaces is presented. The object is cascaded into homogeneously filled regions, whose GSMs are found in solving two uncoupled scalar problems related to longitudinal section electric and magnetic modes, and interfaces responsible for interaction of the said modes...
We propose a novel parametric macromodeling method for systems described by scattering parameters, which depend on multiple design variables such as geometrical layout or substrate features. It is able to build accurate multivariate macromodels that are stable and passive over the entire design space. Poles and residues are parameterized indirectly. The proposed method is based on an efficient and...
The main purpose of this work is to present a methodology to calculate Carter's factor using the actual air‐gap geometry, that is, without simplifications of the slot geometry. The methodology is based on the finite element method, and its results are compared with some traditional procedures used for Carter's factor calculation and also with a domain transformation technique. It is shown that the...
The task of reducing the noise and distortion generated by a laser transmitter has always been a challenge to improve the performance of radio over fiber systems. This paper presents a compensation system for nonlinear distortion of a laser transmitter supporting 5.2 GHz radio transmission over fiber employing a feed‐forward linearization technique. The nonlinearity of the laser diode is modeled using...
Three nonlinear reduced‐order modeling approaches are compared in a case study of circuit variability analysis for deep submicron complementary metal‐oxide‐semiconductor technologies where variability of the electrical characteristics of a transistor can be significantly detrimental to circuit performance. The drain currents of 65 nm N‐type metal‐oxide‐semiconductor and P‐type metal‐oxide‐semiconductor...
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