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Title: Comparison of shielding effectiveness of high Q canonical cavities with thin slots in a mode-stirred and anechoic chamber.

Abstract

No abstract prepared.

Authors:
;
Publication Date:
Research Org.:
Sandia National Laboratories
Sponsoring Org.:
USDOE
OSTI Identifier:
892063
Report Number(s):
SAND2006-0224C
TRN: US200622%%591
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the 2006 IEEE APS/URSI/AMEREM conference , July 9-14, 2006, Albuquerque, NM.
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; CAVITIES; SHIELDING; COMPARATIVE EVALUATIONS

Citation Formats

Charley, Dawna R., and Higgins, Matthew B. Comparison of shielding effectiveness of high Q canonical cavities with thin slots in a mode-stirred and anechoic chamber.. United States: N. p., 2006. Web.
Charley, Dawna R., & Higgins, Matthew B. Comparison of shielding effectiveness of high Q canonical cavities with thin slots in a mode-stirred and anechoic chamber.. United States.
Charley, Dawna R., and Higgins, Matthew B. Sun . "Comparison of shielding effectiveness of high Q canonical cavities with thin slots in a mode-stirred and anechoic chamber.". United States. doi:.
@article{osti_892063,
title = {Comparison of shielding effectiveness of high Q canonical cavities with thin slots in a mode-stirred and anechoic chamber.},
author = {Charley, Dawna R. and Higgins, Matthew B.},
abstractNote = {No abstract prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}

Conference:
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  • We have determined experimentally the Shielding Effectiveness (SE) at microwave frequencies of various types of single- and double-braided cables and connectors typical of systems that have been hardened to electromagnetic fields. This report describes a laboratory-sized reverberation chamber and the techniques used to measure the SE of several interconnecting components. Graphical results are presented in the report, along with smoothed overlay plots for each category of measurements. The overlay plots indicate the general trends in the raw data and highlight the differences between tested components. 7 refs., 22 figs.
  • The electromagnetic field in a mode-stirred chamber is a random process. Samples of this random process are random variables. Different realizations of this random variable can be obtained by changing the paddle-wheel angle, changing the frequency, or changing the location at which the sample is taken. Correlation widths can be defined for each of these three variables. For examples, the spatial correlation width is the distance a point sensor must be moved to realize an uncorrelated value of the field (paddle-wheel angle and frequency held constant). Likewise, the paddle-wheel correlation width is the angle through which the paddle wheel mustmore » turn to yield an uncorrelated value (location and frequency held constant). The frequency correlation width is the frequency change required to yield an uncorrelated value (location and paddle-wheel angle held constant). These values were determined experimentally for the sandia mode-stirred chamber by sampling the field at equal increments (for each variable) and calculating an autocorrelation function. The autocorrelation function is a random process (because it is calculated from a random process) and must be averaged to determine it width. The correlation widths were found to be less than 0.1{degree} for paddle-wheel angle, 50 kHz for frequency, and half a wavelength for spatial location. 4 refs., 3 figs., 2 tabs.« less
  • Mode-stirred chamber and anechoic chamber measurements were made on two sets of canonical test objects (cylindrical and rectangular) with varying numbers of thin slot apertures. The shielding effectiveness was compared to determine the level of correction needed to compensate the mode-stirred data to levels commensurate with anechoic data from the same test object.