Penetration through Slots in Cylindrical Cavities Operating at Fundamental Cavity Modes in the Presence of Electromagnetic Absorbers

Journal Article · Wed Jan 01 00:00:00 EST 2020 · Progress in Electromagnetics Research M

DOI:https://doi.org/10.2528/pierm20060803· OSTI ID:1667389

Campione, Salvatore ^[1]; Warne, Larry Kevin ^[1]; Reines, Isak C. ^[1]; Gutierrez, Roy K. ^[1]; Williams, Jeffery T. ^[1]

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

Placing microwave absorbing materials into a high-quality factor resonant cavity may in general reduce the large interior electromagnetic fields excited under external illumination. In this study, we aim to combine two analytical models we previously developed: 1) an unmatched formulation for frequencies below the slot resonance to model shielding effectiveness versus frequency; and 2) a perturbation model approach to estimate the quality factor of cavities in the presence of absorbers. The resulting model realizes a toolkit with which design guidelines of the absorber's properties and location can be optimized over a frequency band. Analytic predictions of shielding effectiveness for three transverse magnetic modes for various locations of the absorber placed on the inside cavity wall show good agreement with both full-wave simulations and experiments, and validate the proposed model. This analysis opens new avenues for specialized ways to mitigate harmful fields within cavities.

• Research Organization: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: AC04-94AL85000; NA0003525
• OSTI ID: 1667389
• Report Number(s): SAND--2020-8542J; 690015
• Journal Information: Progress in Electromagnetics Research M, Journal Name: Progress in Electromagnetics Research M Vol. 96; ISSN 1937-8726
• Publisher: EMW Publishing
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
cavity
electromagnetic absorber
perturbation model
quality factor
shielding effectiveness
slots
unmatched formulation