Magnetic Pendulum Arrays for Efficient ULF Transmission
Magnetic Pendulum Arrays for Efficient ULF Transmission
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DOI：
10.1038/s41598-019-49341-4
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发表时间：
2019-09-13
影响因子：
4.6
通讯作者：
Bland, Scott
中科院分区：
文献类型：
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作者：
Prasad, Srinivas M. N.;Tok, Rustu Umut;Bland, Scott
300 Hz 至 3 kHz 之间的频率被指定为超低频 (ULF)，相应的波长为 1000 Km 至 100 Km。尽管ULF的带宽非常低，但它非常可靠、具有穿透力且不易干扰，这使其成为水下和地下环境中通信的绝佳选择。直径为 1 米的小型便携式 ULF 天线在自由空间中的电长度约为 10(-4) 至 10(-6) 波长，这使得它们的效率非常低，因为小型电天线的辐射受到基本限制。为了克服这个问题，最近提出了用于超低频通信的机械天线或“Mechtennas”。为了有效产生 ULF 辐射，我们提出了一种称为磁摆阵列 (MPA) 的便携式机电系统。提供了 1.03 kHz 系统的概念验证演示。理论和实验结果表明，这种系统可以实现比传统线圈显着更高的品质因数，从而提高一个数量级的传输效率。该概念可以轻松扩展到 ULF 频率范围。
The frequencies lying between 300 Hz to 3 kHz have been designated as Ultra Low Frequency (ULF) with corresponding wavelengths from 1000 Km to 100 Km. Although ULF has very low bandwidth it is very reliable, penetrating and difficult to jam which makes it a great choice for communication in underwater and underground environments. Small and portable ULF antennas within a diameter of 1 meter would operate under an electrical length on the order of 10(-4) to 10(-6) wavelengths in free space, making them very inefficient because of fundamental limits on radiation from electrically small antennas. To overcome this problem, Mechanical Antennas or 'Mechtennas' for Ultra Low Frequency Communications have been proposed recently. For efficient generation of ULF radiation, we propose a portable electromechanical system called a Magnetic Pendulum Array (MPA). A proof of concept demonstration of the system at 1.03 kHz is presented. The theory and experimental results demonstrate that such a system can achieve a significantly higher quality factor than conventional coils and thus order of magnitude higher transmission efficiency. The concept can be easily scaled to the ULF range of frequencies.