IEEE Transactions on Electromagnetic Compatibility · 2005 · 104 citations · 2 references
EngineeringElectrical EngineeringElectromagneticsElectromagnetismMicrowave EngineeringElectromagnetic PowerShielding DesignShielding MaterialsElectromagnetic ShieldingMagnetic ShieldingShielded EnclosuresShieldingShielding EffectivenessShielding Effectiveness AssessmentShielding Effectiveness EvaluationTransient Electromagnetic Fields
Shielding effectiveness is commonly defined as a simple combination of electric and magnetic measurements. The paper introduces new definitions of shielding effectiveness for high‑frequency and transient electromagnetic fields. The authors derive shielding effectiveness from the ratio of time‑averaged input power (or absorbed energy) between unshielded and shielded loads in the limit of a vanishing load, applying the same procedure to transient fields. The new definitions are practicable, better characterize shielding ability than existing ones, and numerical results for closed and non‑closed cylindrical shields confirm their effectiveness.
This paper deals with new definitions of shielding effectiveness, in particular for high-frequency and transient electromagnetic fields. They are practicable and supposed to better characterize the shielding ability than the commonly used definitions. From the ratio of the time-averaged input power of the unshielded load to that one of the shielded load, in the limiting case of a vanishing load the electromagnetic shielding effectiveness is derived. This is a simple combination of the commonly used and easily measurable electric and magnetic shielding effectiveness. A similar procedure is then employed for the transient case, where in the limiting case of a vanishing load the ratio of the absorbed energies turn into the transient shielding effectiveness. Numerical results are shown for closed as well as for nonclosed cylindrical shields.
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