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In this paper, a specific absorption rate (SAR) evaluation on human exposure from wireless communication devices inside a vehicle is investigated. A finite-difference time-domain method (FDTD) is used for simulating the electromagnetic field distribution inside the vehicle. Results have shown that the maximum SAR induced for a mobile phone user in the vehicle is only increased by 5% when compared...
In computational electromagnetic simulations, most validation methods have been developed until now to be used in the frequency domain. However, the EMC analysis of the systems in the frequency domain many times is not enough to evaluate the immunity of current communication devices. Based on several studies, in this paper we propose an alternative method of validation of the transients in time domain...
This paper presents an efficient technique to evaluate the propagation characteristics of PCB traces with periodic roughness. This technique is based on the application of the array-scanning-method finite-different time-domain technique in which only a single periodic element needs to be modeled. Numerical examples are used to demonstrate the effectiveness and efficiency of this approach.
This paper presents the electromagnetic interference shielding impact due to air vent holes on electronic systems chassis. In the study, finite-difference time domain (FDTD) simulations are used to investigate effects of aperture hole size on shielding performance. A numerical analysis is then proposed which enables mathematical quantification of expected shielding as a function of holes number, size,...
The coupling mechanisms on a commercial mobile phone PCB with different shielding configurations has been investigated with FDTD simulation in this paper. A modified PCB based on the commercial PCB was manufactured for validation purposes prior to the simulation. Good agreement between simulation and measurement was obtained. The coupling performance of the commercial PCB was then reproduced with...
This paper presents a new simulation methodology to study the effect of radiated transient disturbances on digital communication systems. The procedure is divided in two stages. In the first one, FDTD numerical simulation is used to determine the transient levels coupled to the antennas. In the second stage, these levels are analyzed by means of a signal processing simulation software to determine...
Finite-difference time-domain (FDTD) method has been widely used in the calculation of lightning generated electromagnetic fields, and the length of lightning discharge channel is usually set to be 2500~3000m according to the height of cloud layer, this is rather time consuming. In order to save the computation time, we shorten the channel length to 1000m, calculate the electric and magnetic fields...
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