A circuit model for predicting the shielding effectiveness of cylindrical enclosure

Abstract

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 SE 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.