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Title: Perturbation theory to model shielding effectiveness of cavities loaded with electromagnetic dampeners

Abstract

It is notable that a slotted resonant cavity with high-quality factor exhibits interior electromagnetic (EM) fields that may be even larger than the external field. The authors aspire to reduce the cavity's EM fields and quality factor over a frequency band analytically, numerically, and experimentally by introducing microwave absorbing materials in the cavity. A perturbation model approach was developed to estimate the quality factor of loaded cavities, which is validated against full-wave simulations and experiments. Conclusions with 78.7 mils (2 mm) thick ECCOSORB-MCS absorber placed on the inside cavity wall above and below the aperture slot (with only 0.026% cavity volume) result in a reduction of shielding effectiveness >19 dB and reductions in quality factor >91%, providing confirmation of the efficacy of this approach.

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)
OSTI Identifier:
1515208
Report Number(s):
SAND-2019-4101J
Journal ID: ISSN 0013-5194; 674622
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Electronics Letters
Additional Journal Information:
Journal Volume: 55; Journal Issue: 11; Journal ID: ISSN 0013-5194
Publisher:
Institution of Engineering and Technology (IET)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; microwave materials; perturbation theory; Q-factor; cavity resonators; electromagnetic shielding; microwave absorption

Citation Formats

Campione, Salvatore, Reines, Isak C., Warne, L. K., Grimms, Caleb, Williams, Jeffery T., Gutierrez, Roy K., Coats, Rebecca S., and Basilio, Lorena I. Perturbation theory to model shielding effectiveness of cavities loaded with electromagnetic dampeners. United States: N. p., 2019. Web. doi:10.1049/el.2019.0656.
Campione, Salvatore, Reines, Isak C., Warne, L. K., Grimms, Caleb, Williams, Jeffery T., Gutierrez, Roy K., Coats, Rebecca S., & Basilio, Lorena I. Perturbation theory to model shielding effectiveness of cavities loaded with electromagnetic dampeners. United States. https://doi.org/10.1049/el.2019.0656
Campione, Salvatore, Reines, Isak C., Warne, L. K., Grimms, Caleb, Williams, Jeffery T., Gutierrez, Roy K., Coats, Rebecca S., and Basilio, Lorena I. Thu . "Perturbation theory to model shielding effectiveness of cavities loaded with electromagnetic dampeners". United States. https://doi.org/10.1049/el.2019.0656. https://www.osti.gov/servlets/purl/1515208.
@article{osti_1515208,
title = {Perturbation theory to model shielding effectiveness of cavities loaded with electromagnetic dampeners},
author = {Campione, Salvatore and Reines, Isak C. and Warne, L. K. and Grimms, Caleb and Williams, Jeffery T. and Gutierrez, Roy K. and Coats, Rebecca S. and Basilio, Lorena I.},
abstractNote = {It is notable that a slotted resonant cavity with high-quality factor exhibits interior electromagnetic (EM) fields that may be even larger than the external field. The authors aspire to reduce the cavity's EM fields and quality factor over a frequency band analytically, numerically, and experimentally by introducing microwave absorbing materials in the cavity. A perturbation model approach was developed to estimate the quality factor of loaded cavities, which is validated against full-wave simulations and experiments. Conclusions with 78.7 mils (2 mm) thick ECCOSORB-MCS absorber placed on the inside cavity wall above and below the aperture slot (with only 0.026% cavity volume) result in a reduction of shielding effectiveness >19 dB and reductions in quality factor >91%, providing confirmation of the efficacy of this approach.},
doi = {10.1049/el.2019.0656},
url = {https://www.osti.gov/biblio/1515208}, journal = {Electronics Letters},
issn = {0013-5194},
number = 11,
volume = 55,
place = {United States},
year = {2019},
month = {9}
}

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Works referenced in this record:

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journal, January 1998


Accurate Modeling of Monopole Antennas in Shielded Enclosures with Apertures
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Reduction of Cavity Resonance In Wireless Applications
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