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A Simulation Study of Specific Absorption Rate With Twisted Loop Antennas
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electromagnetic Engineering and Fusion Science.ORCID iD: 0009-0008-5778-8317
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering.
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electromagnetic Engineering and Fusion Science.
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electromagnetic Engineering and Fusion Science.ORCID iD: 0000-0002-7550-329X
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2024 (English)In: 2024 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC), Institute of Electrical and Electronics Engineers (IEEE) , 2024, p. 119-121Conference paper, Published paper (Refereed)
Abstract [en]

In this study, we analyze the radiation properties of the 1λ-mode loop antenna and identify the superposition of the tangential magnetic field radiated from the two in-phase electric currents as the dominant source of specific absorption rate (SAR). Increasing the physical distance between the currents does not reduce the peak 10 g -SAR levels as the superposition of the magnetic field always generates a single 10 g -SAR hotspot in the middle of the loop. One potential solution to reduce the 10g-SAR for SAR compliance is the excitation of the two current sources with a 180-degree phase difference, this is achieved by introducing a twist in the loop. The twisted loop has two 10 g SAR hotspots with a lower peak level and also achieves a 50% size reduction.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE) , 2024. p. 119-121
Keywords [en]
Loop antenna, specific absorption rate (SAR)
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-356661DOI: 10.1109/APWC61918.2024.10701979Scopus ID: 2-s2.0-85208432711OAI: oai:DiVA.org:kth-356661DiVA, id: diva2:1914831
Conference
13th IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications, APWC 2024, Lisbon, Portugal, September 2-6, 2024
Note

Part of ISBN 9798350360776

QC 20260121

Available from: 2024-11-20 Created: 2024-11-20 Last updated: 2026-01-21Bibliographically approved

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Fu, WenfuLindohf, HaraldClendinning, SarahHe, Sailing

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