Shielding Effectiveness of Meltblown Non-Woven Fabric Type Non-Magnetic Noise Suppressor

摘要

A new noise suppressor made from metal-coated non-woven fabrics is developed and studied by electromagnetic simulation and measurements. In the case of far fields, the shielding effectiveness to plane waves can be calculated using sheet resistance by regarding the non-woven fabric as a continuous metal sheet. In this case, the low wave impedance in the fine fiber layers generates a high shielding effectiveness. Furthermore, the model of the only thin fibers have been constructed in order to clarify the noise suppression mechanism of high noise suppression performance of thin fibers. The contact resistance between the fibers is arranged to discuss the contact condition between fibers. As a result, the shielding effectiveness increases with the fiber layer increase and does not change with changing the contact resistance.