Enhanced Planar Antenna Efficiency Through Magnetic Thin-Films

Yao, Zhi Jackie; Tiwari, Sidhant; Schneider, Joseph Devin; Candler, Robert N.; Carman, Greg; Wang, Yuanxun

doi:10.1109/JMMCT.2021.3136877

Title: Enhanced Planar Antenna Efficiency Through Magnetic Thin-Films

Journal Article · Tue Dec 21 00:00:00 EST 2021 · IEEE Journal on Multiscale and Multiphysics Computational Techniques

DOI:https://doi.org/10.1109/JMMCT.2021.3136877· OSTI ID:1838251

Yao, Zhi Jackie ^[1]; Tiwari, Sidhant ^[2]; Schneider, Joseph Devin ^[3]; Candler, Robert N. ^[2]; Carman, Greg ^[2]; Wang, Yuanxun ^[2]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of California, Los Angeles, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

This work proposes to use magnetic material as the substrate of planar antennas to overcome the platform effect caused by the conducting ground plane. The upper bound of the radiation efficiency of an electric-current-driven low-profile antenna is theoretically derived, which is inversely proportional to the Gilbert damping factor of the magnetic material. Meanwhile, the improvement of radiation due to the use of magnetic material is demonstrated by a three-dimensional (3D) multiphysics and multiscale time-domain model. The simulation results match the theoretical derivation, showing 25% radiation efficiency from a planar antenna backed by a FeGaB thin film with 2.56 m thickness. Furthermore, for conductive ferromagnetic materials, it is shown that the eddy current loss can be well suppressed by laminating the thin film into multiple layers. Here, the radiation efficiency of the modeled antenna with a conductive ferromagnetic substrate is improved from 2.2% to 11.8% by dividing the substrate into 10 layers, with a ferromagnetic material fill factor of 93%.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1838251

Report Number(s):: LLNL-JRNL-822229; 1034456

Journal Information:: IEEE Journal on Multiscale and Multiphysics Computational Techniques, Vol. 6; ISSN 2379-8793

Publisher:: IEEECopyright Statement

Country of Publication:: United States

Language:: English

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42 ENGINEERING
ADI
eddy current loss
electromagnetics
antenna
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ferromagnetic resonance
lamination
magnetic thin films
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planar structures
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radiation efficiency
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Title: Enhanced Planar Antenna Efficiency Through Magnetic Thin-Films

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