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

Journal Article · Thu Sep 05 00:00:00 EDT 2019 · Electronics Letters

DOI:https://doi.org/10.1049/el.2019.0656· OSTI ID:1515208

Campione, Salvatore ^[1]; Reines, Isak C. ^[1]; Warne, L. K. ^[1]; Grimms, Caleb ^[1]; Williams, Jeffery T. ^[1]; Gutierrez, Roy K. ^[1]; Coats, Rebecca S. ^[1]; Basilio, Lorena I. ^[1]

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1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

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.

• Research Organization: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: AC04-94AL85000
• OSTI ID: 1515208
• Alternate ID(s): OSTI ID: 1786484
• Report Number(s): SAND-2019-4101J; 674622
• Journal Information: Electronics Letters, Vol. 55, Issue 11; ISSN 0013-5194
• Publisher: Institution of Engineering and Technology (IET)
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
microwave materials
perturbation theory
Q-factor
cavity resonators
electromagnetic shielding
microwave absorption