RE: Loss through concrete

All,

There is a report out of Rome Air Development Center RADC-TR-67-446, Feb.
1968 by C.M. Brennan et al titled EM shielding of building materials. It
is referenced in a more recent Sept. 1984 report by J.C. Wyss titled
Building Penetration Project that is available through NTIS, number
PB85-126001. The loss through Portland cement concrete, aggregate to
cement ratio = 3:1, that was saturated with moisture is reported from the
former in the latter, with a 10% "assigned uncertainty", to be:

Freq, Hz Attn., dB/cm
 1.0 E4 2.98 E-7
 1.0 E5 4.41 E-7
 1.0 E6 1.50 E-6
 1.0 E7 2.58 E-6
 1.0 E8 4.84 E-5
 1.0 E9 7.6 E-4
 1.0 E10 7.6 E-3*

* denotes extrapolation.

Plywood, dry wall, Doglas Fir, etc. are also listed in the NTIS report.

Allen Davidson
Motorola Rm 2240
1301 E. Algonquin Rd.
Schaumburg, IL 60196

E-Mail: CASR04_at_email.mot.com
________________________________________________________
To: boyer_at_rd.bbc.co.uk_at_INTERNET
Cc: nec-list_at_ee.ubc.ca_at_INTERNET
From: lgreco_at_westnet.com_at_INTERNET on Wed, Jun 26, 1996 4:16 PM
Subject: Re: Loss through concrete

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I'd like to know, too! Including RF absorption by common contruction
materials like roofing, sheet rock, wood, plywood, etc. at VHF to
microwave.

Luigi

----------------------------------------------------------------------
Greco Electromagnetics | Consulting in RF/Microwave Communications, |
Luigi A. Greco, Ph.D. | Antennas/Transmission Lines, Propagation/ |
Tel: 914-328-3882 | Intermodulation Studies, Interference, |
lgreco_at_westnet.com | Electromagnetic Compatibility. |
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On Wed, 26 Jun 1996, John Boyer wrote:

> Hi all,
>
> I know this isn't a NEC question, but...
> Has anyone done any work on the absorbtion of RF (Say 10-14G) through
> things like brick walls or concrete??
>
> J.
>
>
Received on Mon Jul 01 1996 - 21:41:00 EDT