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There are several disadvantages in the current electromagnetic theory of reverberation chamber analysis. The first disadvantage is that the current theory can only estimate number of electromagnetic modes and statistic uniform field distribution under high order modes circumstance inside a reverberation chamber, not give a systematic electromagnetic analysis of operating reverberation chamber. The...
In this paper, a method that combines the microwave network theory with MoM-FDTD algorithm to calculate the isolation between antennas involving dielectric objects is presented. First, a novel iteration procedure of a hybrid method combining the method of moments with the finite-difference time-domain method is employed to simulate the antennas with dielectric objects. Then, the network theory is...
The following topics were dealt with: wireless communications; microwave electronics; antenna; EMC; electromagnetic wave propagation theory; signal processing; coding; and waveforms;
In EMC study, the interaction of two-antenna system is usually described with isolation between antennas. In this paper, the authors point out the definition of traditional isolation between antennas is unreasonable and it will give incorrect isolation prediction. We put forward definitions of arbitrary isolation, ideal isolation and practical isolation of antennas according to three states of antenna...
We estimated the measurement uncertainty of electromagnetic conducted immunity using CDN (coupling/decoupling network). We analyzed the contribution factors for the uncertainty and obtained the uncertainty by each factor. The contributions of the uncertainty are the repeatability of measurement system; harmonics of power amplifier; the accuracy of power meter; mismatch between power amplifier and...
This article describes the changes in spectrum management, driven by modern communications system concepts and new-type RF hardware and software developments, briefly discusses strategy of the spectrum management in the future, including spectrum-sharing technology, multi-dimension frequency assignments, and dynamically allocated frequency assignments spectrum concept. This article draws the following...
Ferrite grid is generally used in EMC anechoic chamber combined with the urethane pyramids to get good absorbing effect. Grid has superior performance than ferrite tile. This paper gives some key points in the modeling of the grid, including the disposal for dispersive material and boundary condition. Then some simulated results from different aspect are presented to get some guidelines for designing
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