Search results for "Finite-difference time-domain method"

showing 10 items of 39 documents

A Smoothed Particle Interpolation Scheme for Transient Electromagnetic Simulation

2006

In this paper, the fundamentals of a mesh-free particle numerical method for electromagnetic transient simulation are presented. The smoothed particle interpolation methodology is used by considering the particles as interpolation points in which the electromagnetic field components are computed. The particles can be arbitrarily placed in the problem domain: No regular grid, nor connectivity laws among the particles, have to be initially stated. Thus, the particles can be thickened only in distinct confined areas, where the electromagnetic field rapidly varies or in those regions in which objects of complex shape have to be simulated. Maxwell’s equations with the assigned boundary and initi…

Electromagnetic fieldPhysicsElectromagnetic (EM) transient analysiNumerical analysisMesh-free numerical techniqueSPHMathematical analysisFinite-difference time-domain methodNumerical MethodElectronic Optical and Magnetic MaterialsRegular gridsymbols.namesakeSmoothed particle interpolationSettore MAT/08 - Analisi NumericaSettore ING-IND/31 - ElettrotecnicaClassical mechanicsMaxwell's equationsElectromagnetismsymbolsParticleElectrical and Electronic EngineeringInterpolation
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FDTD simulation for electromagnetic radiated emissions in 42 V vehicle electrical systems

2005

In this paper a full 3D approach, based on finite difference time domain method, is used to predict the electromagnetic radiated emissions from 42 V vehicle electrical loads. An experimental set-up has been arranged on purpose. A comparative analysis among measured and computed results is performed. The good agreement obtained among simulated and measured data enables to validate the numerical scheme. The proposed methodology contributes to predict electromagnetic emissions in the automotive environment since the design stage. Moreover, the proposed numerical tool can be used to define, for new vehicle electrical architectures, low cost test methods for electromagnetic compatibility and sui…

EngineeringDesign stagebusiness.industryFDTDAutomotive industryElectromagnetic compatibilityFinite-difference time-domain methodTransmission-line matrix methodComputer simulationElectric vehicleElectromagnetic wave emissionAutomotive engineeringAutomotive electronicsAutomotive engineeringFinite difference time domain analysisSettore ING-IND/31 - ElettrotecnicaElectrical engineeringTime domain analysiElectronic engineeringComputational electromagneticselectromagnetic radiated emissionbusinessvehicular electrical systemElectric load
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Finite-Difference Time-Domain Simulation of Tower and Grounding Subjected to Lightning

2015

In this paper the behavior of a tower and its grounding system, subjected to a lightning, is faced. Finite difference time domain (FDTD) method has been chosen in order to study the non-linear time domain behavior of the system. The electromagnetic problem has been described by using two type of first order time derivative equations: Maxwell's equations and Telegraph equations. Aim of this work is to evaluate the possibility of a flashover between tower and power line, by considering different cases of study.

EngineeringGroundbusiness.industryMathematical analysisElectrical engineeringFinite-difference time-domain methodSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciEarthing systemLightningPower (physics)Settore ING-IND/31 - Elettrotecnicalightning grounding towerTime derivativeTime domainbusinessTower
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Efficient FDTD analysis of discontinuities in a square coaxial waveguide

1996

Engineeringbusiness.industryAcousticsFinite-difference time-domain methodElectronic engineeringCoaxial waveguidesElectrical and Electronic EngineeringClassification of discontinuitiesCondensed Matter PhysicsbusinessAtomic and Molecular Physics and OpticsSquare (algebra)Electronic Optical and Magnetic MaterialsMicrowave and Optical Technology Letters
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A low-cost compact uniplanar Quasi–Yagi printed antenna

2008

A low cost directive uniplanar broadband printed Quasi–Yagi antenna design is presented. As a particular realization, some prototypes have been designed to operate in the 2.45 GHz band. They have been then modeled, fabricated onto standard printed circuit dielectric substrate and tested successfully. For the design and the modeling processes, we have make use of FDTD based in-house developed algorithms. The obtained bandwidth is, for all the considered cases, better than 15%. The main radiation characteristics are 2–5.5 dBi gain, depending on the number of director elements, and better than 25 dB front-to-back ratio. Overall antenna size was, in any case lesser than 1 λ × 0.5 λ. © 2008 Wile…

Engineeringbusiness.industryAntenna designBandwidth (signal processing)Electrical engineeringFinite-difference time-domain methodDielectric substrateCondensed Matter PhysicsDirectivityAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsPrinted circuit boardBroadbandElectrical and Electronic EngineeringbusinessMicrowaveMicrowave and Optical Technology Letters
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Design of Yagi-like printed antennas for WLAN applications

2007

A directive broadband printed Yagi-like antenna design is presented. We have focused on the 2.45 GHz WLAN band, at which some designs have been carried out. For the design and the modelling processes, we made use of FDTD based in-house developed algorithms. Some selected prototypes have then been fabricated onto a low-cost printed circuit board dielectric substrate and tested successfully. Bandwidths higher than 10% and moderate to high (>7 dBi) gains can be obtained this way. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2174–2178, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22655

Engineeringbusiness.industryAntenna designFinite-difference time-domain methodElectrical engineeringDielectric substrateCondensed Matter PhysicsDirectivityAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsPrinted circuit boardBroadbandElectronic engineeringElectrical and Electronic EngineeringbusinessMicrowaveMicrowave and Optical Technology Letters
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Full-wave FDTD design and analysis of wideband microstrip-to-waveguide transitions

2003

Wideband transitions are designed and analysed by using two different approaches of the finite-difference time-domain (FDTD) method, in combination with the theory of nonuniform transmission lines. These transitions consist of a ridged waveguide-based taper between a shielded microstrip and a standard X-band rectangular waveguide. In the first step, a full-wave 2D-FDTD scheme is used to calculate the dispersion characteristics, as well as the geometry dependence of the impedance in the double ridged waveguide. Once these design curves have been obtained, the stepped transmission line transformer theory is used to design the tapers. In a former step, the nonuniform 3D-FDTD technique is appli…

Engineeringbusiness.industryFinite-difference time-domain methodCondensed Matter PhysicsWaveguide (optics)Atomic and Molecular Physics and OpticsMicrostripElectronic Optical and Magnetic MaterialsElectric power transmissionOpticsDispersion (optics)Electrical and Electronic EngineeringWidebandbusinessElectrical impedanceMicrowaveMicrowave and Optical Technology Letters
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Calculation of the characteristic impedance of microstrips using a full-wave 2-D FDTD scheme

1997

The frequency dependence of the characteristic impedance of microstrip lines has been investigated by many authors using 3D-FDTD formulations. In the present letter, a two-dimensional FDTD scheme is used to calculate both the propagation constant and the characteristic impedance of the fundamental quasi-TEM mode in a microstrip which, in fact, is a hybrid mode. Because of the substantial reduction of computer resources required for the calculations, this method can be used as a design tool. © 1997 John Wiley & Sons, Inc. Microwave Opt Technol Lett 16: 58–60, 1997.

Engineeringbusiness.industryFinite-difference time-domain methodMode (statistics)Condensed Matter PhysicsAtomic and Molecular Physics and OpticsMicrostripCharacteristic impedanceElectronic Optical and Magnetic MaterialsComputational physicsScheme (mathematics)Electronic engineeringElectrical and Electronic EngineeringPropagation constantbusinessReduction (mathematics)MicrowaveMicrowave and Optical Technology Letters
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Finite-Difference Time-Domain Simulation of Towers Cascade Under Lightning Surge Conditions

2015

In this paper, the simulation of towers cascade under lightning surge conditions is presented. Finite-difference time-domain method is used to solve both the Maxwell's and telegraph equations. Maxwell's equations and the time-domain resistivity model of Darveniza are used to simulate the nonlinear behavior of the grounding system. Telegraph equations are used to describe the propagation in the overhead lines. Multiple ionizations, on different grounding electrodes belonging to various towers, can be implemented simultaneously, without making assumptions on the shape of the ionized areas.

Engineeringbusiness.industryGroundFinite difference methodElectrical engineeringFinite-difference time-domain methodMechanicsSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciEarthing systemIndustrial and Manufacturing EngineeringFinite-difference time domain (FDTD) grounding ionization lightning Maxwell’s equationsNonlinear systemSettore ING-IND/31 - ElettrotecnicaControl and Systems EngineeringCascadeLightning surgesOverhead (computing)Electrical and Electronic Engineeringbusiness
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Evaluation of radiated EMI in 42 V vehicle electrical systems by FDTD simulation

2007

In this paper a full 3D numerical scheme, based on the finite difference time domain method, is used to predict the electromagnetic radiated interference generated by 42 V vehicle power electronic driven electrical loads. An experimental set-up has been arranged on purpose in order to validate the proposed simulation tool. To this aim, the features of a semi-anechoic electromagnetic chamber have been exploited in order to operate in a shielded test site for the measurement of near field radiated emissions. Two different three-dimensional geometrical configurations of realistic vehicle installations of the loads, are studied. A comparative analysis among measured and computed results is perf…

Engineeringbusiness.product_categoryComputer Networks and Communicationsbusiness.industryelectromagnetic transient analysisFinite-difference time-domain methodElectromagnetic compatibilityAerospace Engineeringelectromagnetic radiative interferenceTest methodEffective radiated powerfinite-differenceElectromagnetic interferenceEMIAutomotive EngineeringElectric vehicleElectronic engineeringTime domainDual-voltage vehicle electrical systemElectrical and Electronic Engineeringbusiness
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