A fast method for estimating shielding effectiveness of an enclosure with apertures

Abstract

A new and fast method to determine the shielding effectiveness (SE) of an enclosure with aperture is proposed. This method is based on the Z-parameter analysis combined with a circuit theory to define which configuration of the apertures can result in the optimum SE. The method is based on the fact that an aperture with the least destruction in the current flow due the incident field will have most effective canceling field. To show the effectiveness of the method and its excellent capability in estimating SE two examples, which have been numerically investigated in recent literatures, are solved. The simulation results of this fast and simple technique fit very well with those of the complex and time consuming numerical approaches. Furthermore, using this method the designer is able to recognize the problematic points and easily can optimize the shielding geometry.

Using a network of ports for shielding effectiveness optimization of an enclosure with arbitrary shape apertures

“…Two ports were used on an enclosure with an aperture, and the impedance and scattering parameters were compared for different dimensions of the aperture. The results, presented in Shourvarzi and Joodaki, show good consistency with the previously published works, eg, Zhou and Tong …”

“…As the first step, a case study that had been recently simulated and presented using numerical methods was regenerated with this new method . Two ports were used on an enclosure with an aperture, and the impedance and scattering parameters were compared for different dimensions of the aperture.…”

“…In recent years, highly integrated circuits and high‐operating frequencies have made the electromagnetic compatibility (EMC) a major issue . Among the EMC topics, shielding is a prominent one and there is an outstanding trend to study its different aspects nowadays . The inevitable need for the air ventilations, input/outputs, and other means of connections between either sides of the shields result in designing apertures and slots.…”

“…These discontinuities in the shield body are the main causes of leakage and shielding degradation. Therefore, studying the shields with apertures is a popular branch in shielding research . Shielding effectiveness (SE) is the main parameter of interest in such studies.…”

“…In a previous work of the authors, a fast method for estimating SE of enclosures has been introduced . The proposed method is based on the circuit theory approach and Z‐parameter analysis.…”