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Title: A bound on electromagnetic penetration through a slot aperture with backing cavity

Abstract

This report examines bounds on the penetrant power through ports of entry into a conductive cavity. We first replace the cavity by a load and consider the maximum power transfer properties of an antenna or an aperture. We consider how limitations on the load quality factor place limits on received power. For general frequency ranges we model the backing region by means of a uniformly distributed matched load along a slot aperture and adjust its value for maximum power transfer. This result is derived in closed form using a transmission line model for the aperture. This result illustrates the reduction in received power for low frequencies with finitely conducting wall materials. At high frequencies it approaches the receiving cross section of a linear array having the slot length dimension. Next we examine a slot aperture in a conducting rectangular enclosure and determine how the cavity wall losses and resulting quality factor limit the penetrant power. Detailed simulations and experimental measurements are compared with each other and with the bounding results to assess the accuracy of the bounds. These comparisons also indicate limitations on the accuracy of the models due to perturbing influences in construction, such as bolted joints.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); US Air Force
OSTI Identifier:
1464599
Report Number(s):
SAND-2016-9029
647322
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English

Citation Formats

Warne, Larry K., Jorgenson, Roy E., Williams, Jeffery T., Basilio, Lorena I., Langston, William L., Coats, Rebecca S., Campione, Salvatore, and Chen, Kenneth C. A bound on electromagnetic penetration through a slot aperture with backing cavity. United States: N. p., 2016. Web. doi:10.2172/1464599.
Warne, Larry K., Jorgenson, Roy E., Williams, Jeffery T., Basilio, Lorena I., Langston, William L., Coats, Rebecca S., Campione, Salvatore, & Chen, Kenneth C. A bound on electromagnetic penetration through a slot aperture with backing cavity. United States. https://doi.org/10.2172/1464599
Warne, Larry K., Jorgenson, Roy E., Williams, Jeffery T., Basilio, Lorena I., Langston, William L., Coats, Rebecca S., Campione, Salvatore, and Chen, Kenneth C. Thu . "A bound on electromagnetic penetration through a slot aperture with backing cavity". United States. https://doi.org/10.2172/1464599. https://www.osti.gov/servlets/purl/1464599.
@article{osti_1464599,
title = {A bound on electromagnetic penetration through a slot aperture with backing cavity},
author = {Warne, Larry K. and Jorgenson, Roy E. and Williams, Jeffery T. and Basilio, Lorena I. and Langston, William L. and Coats, Rebecca S. and Campione, Salvatore and Chen, Kenneth C.},
abstractNote = {This report examines bounds on the penetrant power through ports of entry into a conductive cavity. We first replace the cavity by a load and consider the maximum power transfer properties of an antenna or an aperture. We consider how limitations on the load quality factor place limits on received power. For general frequency ranges we model the backing region by means of a uniformly distributed matched load along a slot aperture and adjust its value for maximum power transfer. This result is derived in closed form using a transmission line model for the aperture. This result illustrates the reduction in received power for low frequencies with finitely conducting wall materials. At high frequencies it approaches the receiving cross section of a linear array having the slot length dimension. Next we examine a slot aperture in a conducting rectangular enclosure and determine how the cavity wall losses and resulting quality factor limit the penetrant power. Detailed simulations and experimental measurements are compared with each other and with the bounding results to assess the accuracy of the bounds. These comparisons also indicate limitations on the accuracy of the models due to perturbing influences in construction, such as bolted joints.},
doi = {10.2172/1464599},
url = {https://www.osti.gov/biblio/1464599}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2016},
month = {9}
}