Shielding effectiveness of mesh wire for 50Hz magnetic field

• Main Author: El-Shami, Ibtihal Fawzi
• Format: Thesis
• Language: English; English; English
• Published: 2011
• Subjects: TK Electrical engineering. Electronics Nuclear engineering; TK7800-8360 Electronics
• Online Access: http://eprints.uthm.edu.my/2626/1/24p%20IBTIHAL%20FAWZI%20EL-SHAMI.pdf; http://eprints.uthm.edu.my/2626/2/IBTIHAL%20FAWZI%20EL-SHAMI%20COPYRIGHT%20DECLARATION.pdf; http://eprints.uthm.edu.my/2626/3/IBTIHAL%20FAWZI%20EL-SHAMI%20WATERMARK.pdf; http://eprints.uthm.edu.my/2626/
• Institution: Universiti Tun Hussein Onn Malaysia

A wire mesh shield composed of thin conductive wires will influence the behaviour of electromagnetic fields within it. Many researchers have investigated electromagnetic field behaviour in solid metal, but little of this work has probed into the effects of a wire mesh. The primary goal of this work is to design wire mesh shielding under overhead power lines to investigate the electromagnetic energy transmitted to the ground and possibly can exposed people under certain risk. The electromagnetic shielding of wire-mesh screens is discussed in the frequency range where the individual meshes are electrically small ( )1.0 <L λ . The screen, whose meshes are assumed to be square, its applicability to the measurement of mesh properties is described. The low-frequency magnetic shielding afforded by mesh enclosures is considered. Because of the reactive character of the mesh surface, the near field source shielding effectiveness decreases with increasing frequency. The enclosure magnetic-field shielding effectiveness increases with increasing frequency, but saturates at a maximum value that depends on the geometry of the mesh size, and the mesh wire radius. The enclosure electrostatic-field shielding effectiveness depends only on the enclosure and mesh geometries. Experimentally, shielding effectiveness measurements have been performed. The wire mesh Shields designed in different sizes to find the relation between mesh size and shielding effectiveness.