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Emc Radiation Site Evaluation Using Attenuation Ratios

IP.com Disclosure Number: IPCOM000060077D
Original Publication Date: 1986-Feb-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Cockerill, WC: AUTHOR [+2]

Abstract

A method is described determining the "goodness" of an electromagnetic radiation test site independent of knowledge of antenna factors or the results of a comparison with a standard radiation site. The described method is independent of standard sites and antenna factors. The method first measures the Site Attenuation (SA) at both horizontal and vertical polarizations. The measurement ratio is then computed. The theoretical ratio of the vertical and horizontal polarization can be obtained mathematically. These two ratios are then ratioed together as an absolute measure of site "goodness," and are independent of antenna factors or standard site factors. The "Measured" Ratio = Site loss (v) in dB - Site loss (H) in dB. Site loss measurements are made in accordance with standard procedures.

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Emc Radiation Site Evaluation Using Attenuation Ratios

A method is described determining the "goodness" of an electromagnetic radiation test site independent of knowledge of antenna factors or the results of a comparison with a standard radiation site. The described method is independent of standard sites and antenna factors. The method first measures the Site Attenuation (SA) at both horizontal and vertical polarizations. The measurement ratio is then computed. The theoretical ratio of the vertical and horizontal polarization can be obtained mathematically. These two ratios are then ratioed together as an absolute measure of site "goodness," and are independent of antenna factors or standard site factors. The "Measured" Ratio = Site loss (v) in dB - Site loss (H) in dB. Site loss measurements are made in accordance with standard procedures. A thir ratio, called "goodness Ratio," is "measured" ratio/"theoretical" ratio. When working in dB, subtracting the "theoretical" ratio from the "measured" ratio gives a measure of site "goodness" in dB.

The same method can be used to evaluate sites by ratios of two different distances, for example, 3 and 10 meters, 3 and 30 meters or any other combination of horizontal and/or vertical measurements to measure site performance.

Disclosed anonymously.

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