Shielding effectiveness of reinforced concrete structures in cellular communication bands

Elkamchouchi, Hassan M.; Abdelkader, Abdelraheem

doi:10.1109/nrsc.2002.1022621

Cited by 7 publications

(3 citation statements)

References 2 publications

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“…Reinforcement bars which are frequently added to the concrete not only provide additional strength to the concrete but increase its SE as well, at particular frequency range depending on the reinforced grid size and the diameter of the bar [15]. Besides the reinforcement bars, additional components like metal fibres, carbon fibres, and so on can also be added to the concrete to increase the SE.…”

Section: Introductionmentioning

confidence: 99%

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

Yee

Jenu

2013

2013 Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC)

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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.

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Section: Introductionmentioning

confidence: 99%

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

Yee

Jenu

2013

2013 Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC)

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“…In practice, reinforcing bars are placed inside concrete, and it is well known that concrete has some shielding effects against electromagnetic fields. The shielding effect of concrete itself has also been studied in the past [36][37][38][39][40][41][42][43][44][45]. However, the published work concentrated either on plane waves or on other sources with higher-frequency contents than that of LEMPs.…”

Section: Effect Of Concrete On Lightning Electromagnetic Fields Insidmentioning

confidence: 99%

On the representation of thin wires inside lossy dielectric materials for FDTD‐based LEMP simulations

Tatematsu

Rachidi

Rubinstein

2019

IEEJ Transactions Elec Engng

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The finite‐difference time‐domain method is one of the most widely used numerical electromagnetic computation techniques, and it has become an effective tool for analyzing electromagnetic transient phenomena in three‐dimensional structures and grounding systems. However, the available approaches for representing thin wires apply only to bare conductors such as overhead power lines and earth electrodes. In this work, we demonstrate the applicability of thin‐wire representation techniques to wires surrounded by both lossy and lossless media, such as reinforcing bars inside lossy concrete. The validated technique is then illustrated through the study of a reinforced‐concrete building struck by lightning to evaluate the effect of concrete on the penetration of lightning electromagnetic pulses inside the building. © 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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“…The effects of reinforced wall on the signal attenuation depend on the particular wall structure, electrical properties and incident frequencies. And any changes in these variables can significantly alter the reflection and transmission coefficients [36][37][38].…”

Section: Metal Filling Cement Compositesmentioning

confidence: 99%

Cement based electromagnetic shielding and absorbing building materials

Guan

Liu

Duan

et al. 2006

Cement and Concrete Composites

252

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Shielding effectiveness of reinforced concrete structures in cellular communication bands

Cited by 7 publications

References 2 publications

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

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

On the representation of thin wires inside lossy dielectric materials for FDTD‐based LEMP simulations

Cement based electromagnetic shielding and absorbing building materials

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