Enhanced Planar Antenna Efficiency Through Magnetic Thin-Films
Enhanced Planar Antenna Efficiency Through Magnetic Thin-Films
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DOI：
10.1109/jmmct.2021.3136877
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发表时间：
2021-01-01
影响因子：
2.3
通讯作者：
Wang, Yuanxun Ethan
中科院分区：
文献类型：
--
作者：
Yao, Zhi;Tiwari, Sidhant;Wang, Yuanxun Ethan
本文提出用磁性材料作为平面天线的衬底，以克服导电地平面引起的平台效应。从理论上推导了电流驱动低剖面天线辐射效率的上界，它与磁性材料的吉尔伯特衰减因子成反比。同时，通过三维多物理、多尺度的时间域模型验证了磁性材料的使用对辐射的改善。模拟是在理想的无限大平面电热辐射器上进行的。仿真结果与理论推导相吻合，表明在2.56微米厚的FeGaB薄膜衬底的平面天线上的辐射效率为25%。此外，对于导电铁磁材料，通过将薄膜层叠成多层可以很好地抑制涡流损耗。通过将导电铁磁衬底分成10层，天线的辐射效率从2.2%提高到11.8%，铁磁材料填充因子为93%。
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 is performed on an ideal, infinitely large planar electric radiator. The simulation results match the theoretical derivation, showing 25% radiation efficiency from a planar antenna backed by a FeGaB thin film with 2.56 mu 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. The radiation efficiency of the modeled antenna with a conductive ferromagnetic substrate is improved from 2.2% to 11.8% by dividingthe substrate into 10 layers, with a ferromagnetic material fill factor of 93%.