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The shielding effectiveness of conductive cement-based materials to HEMP is analyzed using theoretical and FDTD method when the materials' conductivity range 10-3~102 S/m. The effect of materials' conductivity on shielding effectiveness to HEMP is obtained and the threshold of materials' conductivity is achieved when their shielding effectiveness increases suddenly. Finally, the experimental shielding...
Electromagnetic shielding is the technique that reduces and prevents coupling of undesired radiated electromagnetic energy into equipment, so as to enable it to operate compatibly in its electromagnetic environment. Usually, the frequency considered for electromagnetic shielding design is above 10 kHz, but the lower frequency for some special demand is 50 Hz or even 0.01 Hz sometimes. This paper mainly...
It presents a measurement of pulsed electric field by way of portable measurement system for the shielding effectiveness of pulsed electric field, tn order to research the influence of bonding method of cross points of reinforced grids and the size of reinforced grids, three bonding methods and two types of reinforced grids' size are evaluated in this measurement. Then the results of experiment are...
This paper presents the measurements of shielding effectiveness of reinforcing bar loops (RBL) and reinforcing bar cage (RBC) to magnetic field. A testing method was applied to measure the shielding effectiveness of RBL and RBC with its joints wired or welded. The signals in this experiment are continuous wave with frequency of 14 kHz, 100 kHz and 200 kHz. The variation of the shielding effectiveness...
This paper presents measurements of shielding effectiveness of reinforced grids cubic cages to pulsed magnetic field. Under the environment of pulsed magnetic fields, the shielding effectiveness of some typical size of the reinforced grids cages were obtained. Two connecting methods for the cross points (welding or banding) of the reinforcement mesh are evaluated. For discussing the pulsed magnetic...
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