2026-04-13T07:23:13Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/4418462026-01-24T08:28:59Zcom_2072_1033col_2072_452950

urn:hdl:2117/441846 Characterizing magnetic shielding effectiveness below 30 MHz using time-domain techniques Caracterización de apantallamiento a campo magnético en frequencias inferiores a 30 MHz usando técnicas en el dominio del tiempo Caracterización de apantallamiento a campo magnético en frequencias inferiores a 30 MHz usando técnicas en el dominio del tiempo Parra Chacón, Julio César Koraqi, Lirim Pissoort, Davy Fernández Chimeno, Mireya Leferink, Frank Azpúrua Auyanet, Marco Aurelio Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica Àrees temàtiques de la UPC::Enginyeria electrònica::Instrumentació i mesura::Compatibilitat electromagnètica Electromagnetic interference Electromagnetic shielding Magnetic field Shielding effectiveness Time domain measurements © 2025 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. This study uses time domain measurements to determine the magnetic field shielding effectiveness (SE) of materials at frequencies below 30 MHz. The setup, inspired by the IEEE 299, employs a shielded room and two loop antennas. To address the challenge of dynamic range compression, commonly encountered when measuring broadband signals, three waveform types —a single pulse, a multitone, and a chirp— are evaluated with respect to the signal-to-noise ratio and detection sensitivity. Validations are performed through comparisons with the existing frequency domain methods and numerical simulations. Using multitone excitation with optimized amplitudes allowed measuring magnetic field SE up to 65 dB. The findings indicate our proposal is a viable alternative for characterizing magnetic field SE in this frequency range, offering comparable results to the vector network analyzer-based method, with the added benefit of faster measurements. Postprint (author's final draft) 2025-07-01 Article https://ieeexplore.ieee.org/document/11060884 Open Access