Simulation of a mode stirred chamber excited by wires using the TLM method (original) (raw)
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A new method for the numerical simulation of the stochastic electromagnetic environment of a mode-stirred chamber is presented in this work. This method is based on the plane wave integral representation for the fields and uses a Monte Carlo simulation to replace the analytical integration by numerical summation. Therefore, a field generator is implemented as a program. The numerically generated field distributions and spatial correlation functions are compared to the analytical solutions for the validation of the field generator.
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This paper aims to present an evaluation of noncanonical mode stirred chambers, whose excitation is carried out by transmission lines. Many configurations are taken into account regarding the influence of the wire arrangement and their phase shift excitation on the field homogeneity. The simulations were carried out within the framework of finite integration technique (FIT) and transmissionline modeling (TLM) methods. Experimental and theoretical results are presented regarding the chamber suitability to electromagnetic compatibility (EMC) tests. It is emphasized the viability of extending the present standard frequency range recommendation to lower frequency values.
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IEE Proceedings - Science, Measurement and Technology, 2006
The coupling between a two-wire transmission line and the electromagnetic field inside a reverberation chamber is analysed. The chamber field is represented by the superposition of plane waves with random incidence. The signal, induced along the line by such a field, is analytically found under general load conditions for the line, including a strong mismatching. Therefore this approach allows the parasitic elements introduced by real terminations and by measuring sensors to be accounted for. The statistics of the current flowing into the line load are analysed in terms of the cumulative distribution function and in terms of the maximum-to-mean ratio, an important parameter in immunity tests. All results are compared with those experimentally obtained in a real reverberation chamber, showing a satisfactory agreement; a discussion about the overall measurement uncertainty is also reported. Finally, some advantages of the use of reverberation chambers for immunity tests are highlighted.
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IEEE Transactions on Electromagnetic Compatibility, 2006
The behavior of a device in a reverberation chamber can be analyzed as the same device irradiated by random plane waves. This work proposes an application of the finite difference time domain method to analyze the device by using a superposition of random plane waves, simulating the behavior of a reverberation chamber. The analysis of a transmission line compared with theoretical and experimental results in a reverberation chamber is reported.
IEEE Transactions on Electromagnetic Compatibility, 2004
Over recent years, reverberation chambers have been analyzed by many numerical techniques. This contribution studies how the finite-difference time-domain algorithm converges to the steady state conditions as a function of the cavity factor, changing the wall conductivity or the internal lossy media. By lowering the reflection coefficient of the chamber walls, the computation time could be considerably reduced without a significant effect on the field distribution for any analyzed antennas. The field distributions are strongly correlated when the conductivity of the wall is one hundredth of the copper conductivity or greater, whereas when the conductivity is lower the correlation between field distributions is low.
IEEE Transactions on Electromagnetic Compatibility, 2006
This paper presents a study of coupling between an external field and a metallic enclosure with a long aperture in the frequency range which includes several box resonances. A reverberation chamber (RC) and an anechoic chamber (AC) are considered as a field generation structure. In both cases, a customized FDTD code is used to calculate the current induced by the external field in a loop placed inside the enclosure. In order to simulate the AC facility, a single plane wave is used to represent the test field, whereas for the RC, the field is represented by a proper superposition of random plane waves. Numerical results are experimentally validated. The proposed method is useful to investigate the performance of the enclosure during its early design stage before the realization of a prototype.