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This paper presents a model to predict the shielding effectiveness (SE) and resonant modes of cylindrical enclosure with apertures or dielectric substrate. In this model, the Robinson equivalent circuit model (RECM) is introduced to deal with aperture impedance, and the extended form of the Baum–Liu–Tesche equation is deduced to calculate the induced voltage in the enclosure. The electromagnetic topology (EMT) model is established to analyze the process of energy transmission inside the enclosure. The energy propagation coefficient matrix and the scattering coefficient matrix are calculated to deal with the SE results of the observation point. To quantify the efficiency of the proposed model, the calculation results are compared with the full-wave transmission line matrix method (TLM) and RECM through the Fréchet distance. The comparison results show that the accuracy of the proposed model is better over a wide frequency range compared with RECM, and meanwhile, it consumes less run time and fewer CPU resources than traditional numerical methods. The validity of the presented model is verified by TLM.

This paper presents a precise circuit model for predicting the shielding effectiveness (SE) and resonances of the cylindrical enclosure. In this model, the waveguide theory is combined with the Robinson model to deal with the influence of the high-order modes and the arbitrary position. The transmission line theory is applied to calculate the enclosure equipped with symmetric apertures or a dielectric layer. The results show that the proposed model can accurately calculate the orthogonal components of voltage response and predict the shielding effectiveness of the monitor point over a wide frequency range. Compared with traditional numerical methods, the proposed model costs less computing time and resources to operate because of employing analytical formulations. The effectiveness of this model is verified by the three-dimensional full-wave transmission line method (TLM).

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