Magnetoactuated Reconfigurable Antennas on Hard-Magnetic Soft Substrates and E-Threads
Magnetoactuated Reconfigurable Antennas on Hard-Magnetic Soft Substrates and E-Threads
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DOI：
10.1109/tap.2020.2988937
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发表时间：
2020-08-01
影响因子：
5.7
通讯作者：
Kiourti, Asimina
中科院分区：
文献类型：
--
作者：
Alharbi, Saad;Ze, Qiji;Kiourti, Asimina
我们报告一类新的可重构天线，实现了可编程硬磁软基板内嵌入导电电子线程。由于其设计、制造和操作简单，依赖于磁致动的天线变形是传统的复杂和劳动密集型重构方法的有前途的替代方案。然而，最先进的磁致动方法依赖于遭受应力失效的软磁材料，自由度有限，并且不允许可编程的极性变形。我们的工作克服了这些挑战。通过将NdFeB颗粒嵌入软硅树脂中，并通过进一步用所得柔性材料涂覆e-螺纹天线，提出了新的原型，其允许可编程极性，稳定的磁特性，不受约束的致动，无法用高速相机（60帧/秒）捕获的响应速度，可逆变形，重量轻，以及极端的机械/热公差。在这篇文章中，我们介绍了这类新的天线的工作原理，优化他们的制造，并验证他们的数值和实验。作为一个概念验证，验证进行手风琴为基础的可调，从680到835 MHz时，由远程磁铁驱动。在未来，这种方法可以被用于消费和国防应用中的各种可重构天线。
We report new classes of reconfigurable antennas realized by embedding conductive e-threads inside programmable hard-magnetic soft substrates. Antenna deformations that rely on magnetic actuation are a promising alternative to conventional complicated and labor-intensive reconfiguration approaches due to their design, fabrication, and operation simplicity. However, state-of-the-art magnetoactuated approaches rely on soft-magnetic materials that suffer from stress failure, exhibit limited degrees of freedom, and do not allow programmable polarity deformations. Our work overcomes these challenges. By embedding NdFeB particles in soft silicone and by further coating e-thread antennas with the resulting flexible material, novel prototypes are brought forward that allow programmable polarity, stable magnetic properties, untethered actuation, response speed that could not be captured with high-speed camera (60 frames/s), reversible deformation, light weight, and extreme mechanical/thermal tolerance. In this article, we introduce the operating principle of this new class of antennas, optimize their fabrication, and validate them numerically and experimentally. As a proof-of-concept, validation is carried out for an accordion-based monopole, tunable from 680 to 835 MHz when actuated by a remote magnet. In future, this approach can be leveraged toward diverse reconfigurable antennas in consumer and defense applications.