An Analytical Model for the Fast Prediction of the Shielding Effectiveness and Resonances of a Lossy Enclosure
Gong Yanfei1, Chen Xingtong2, Gao Chaofei3, Sun Jian1
1. Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument Beijing Information Science and Technology University Beijing 100192 China; 2. State Grid Energy Research Institute Beijing 102209 China; 3. School of Automation Beijing Information Science and Technology University Beijing 100192 China
Abstract An analytical model in this paper is presented to analyze the shielding performance of a lossy enclosure with apertures under the plane wave illumination. The presented model can not only predict the shielding effectiveness (SE) and resonances of a lossy enclosure with off-centered apertures and arbitrarily positioned monitor points, but also analyze the suppression effect of the lossy material on the higher order modes at higher frequencies. Firstly, according to the electromagnetic topology (EMT) theory and circuit theory, the equivalent circuit and signal flow graph of the lossy enclosure can be constructed. Then, the generalized Baum-Liu-Tesche (BLT) equation is derived based on the signal flow graph to calculate the maximum voltage response at the cross section of the monitor point. Finally, based on the relationship between voltage response and field distribution, the total electric field component can be obtained. In a word, the presented model can easily deal with the conditions of single aperture, aperture array and apertures at two opposing walls. CST simulation verifies the validity and accuracy of the presented model, which provides an efficient and reliable computing method in handling a lossy enclosure with apertures.
Gong Yanfei,Chen Xingtong,Gao Chaofei等. An Analytical Model for the Fast Prediction of the Shielding Effectiveness and Resonances of a Lossy Enclosure[J]. Transactions of China Electrotechnical Society, 2021, 36(8): 1569-1578.
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2021, Vol. 36 
