Shielding effectiveness of mesh wire for 50Hz magnetic field
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 wo...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2011
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| Subjects: | |
| 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 |
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| Summary: | 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. |
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