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Shielding effectiveness of concrete with graphite fine powder in between 50MHz to 400MHz

See, Khee Yee and Mohd Jenu, Mohd Zarar (2013) Shielding effectiveness of concrete with graphite fine powder in between 50MHz to 400MHz. In: Asia-Pacific International Symposium and Exhibition on Electromagnet Compatibility, 20-23 May 2013, Melbourne, Australia.

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Abstract

The shielding effectiveness (SE) of building materials is of concern due to the possibility of electromagnetic interference on sensitive equipment located inside the building. The SE of building material could be obtained directly using measurement but it requires expensive and elaborate setup. Alternatively, analytical method is preferable to predict the SE of building material for various conditions regarding the parameters to be evaluated such as thickness, moisture content, percentage of conducting materials added and so forth. Since most of the building materials are non-magnetic, its relative permittivity will be an important parameter for SE calculation. The effective permittivities of the concrete samples between 50 MHz to 400 MHz are measured using a TEM parallel plate. In this work, the SE of concrete samples are compared for various concentrations of graphite fine powder. It is found that a concrete of thickness 20 cm with 12wt% of graphite fine powder is able to provide a maximum of 2.4 dB additional shielding at 360 MHz. It is also observed that reflection loss is the dominant mechanism that contributes on the SE of a concrete with graphite fine powder.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: shielding effectiveness; graphite fine powder; concrete; TEM parallel plate; dielectric measurement
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800-8360 Electronics
Divisions: Faculty of Electrical and Electronic Engineering > Department of Communication Engineering
Depositing User: Normajihan Abd. Rahman
Date Deposited: 14 Jun 2013 07:30
Last Modified: 21 Jan 2015 08:18
URI: http://eprints.uthm.edu.my/id/eprint/3943
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