In the super-low-frequency () band communication, the traditional antenna covers a large area and has low radiation efficiency. The excitation of electromagnetic waves by the mechanical motion of permanent magnets enables miniaturized technology for super-low-frequency communication. For this miniaturization technique, this paper proposes a super-low-frequency communication architecture framework. Theoretical analysis and experimental verification of each unit module in the structural framework are carried out to achieve high-quality communication. For the radiation unit, permanent magnet parameters and communication distances are introduced to establish a rotating permanent magnet radiation power analysis model and to study the radiation characteristics of rotating permanent magnets. For the receiver unit, a sensitivity normalization characterization method based on the ratio of the coil thermal noise voltage to the induced voltage is proposed. Based on the sensitivity analysis model, a square coil was developed that meets the communication requirements of a mechanical antenna and an experimental platform was built. Experiments are conducted on the factors affecting radiated power and coil sensitivity, and 2FSK signal modulation communication experiments are conducted to verify the feasibility of the communication structure framework. The volume of the mechanical antenna permanent magnets in the experiment is all below 10 cm³, and the operating frequency is continuously adjustable from 0 to 250 Hz. The experimental results show that the near-field radiated power of a rotating permanent magnet is proportional to square of the volume of the rotating permanent magnet; the sensitivity of the coil is proportional to the number of turns and the area of the coil. By controlling the speed in real time, you can control the frequency of the signal and modulate it.

中文翻译：

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永磁式超低频机械天线通信研究

在超低频（）在传统的宽带通信中，传统天线覆盖面积大，辐射效率低。永磁体的机械运动激发电磁波，可以实现超低频通信的小型化技术。对于这种小型化技术，本文提出了一种超低频通信架构框架。对结构框架中的每个单元模块进行了理论分析和实验验证，以实现高质量的通信。对于辐射单元，引入永磁体参数和通信距离，以建立旋转永磁体的辐射功率分析模型并研究旋转永磁体的辐射特性。对于接收器单元，提出了一种基于线圈热噪声电压与感应电压之比的灵敏度归一化表征方法。基于灵敏度分析模型，开发了满足机械天线通信要求的方线圈，并搭建了实验平台。对影响辐射功率和线圈灵敏度的因素进行了实验，并进行了2FSK信号调制通信实验，以验证通信结构框架的可行性。实验中的机械天线永磁体的体积都在10厘米以下 开发了满足机械天线通信要求的方形线圈，并建立了实验平台。对影响辐射功率和线圈灵敏度的因素进行了实验，并进行了2FSK信号调制通信实验，以验证通信结构框架的可行性。实验中的机械天线永磁体的体积都在10厘米以下 开发了满足机械天线通信要求的方形线圈，并建立了实验平台。对影响辐射功率和线圈灵敏度的因素进行了实验，并进行了2FSK信号调制通信实验，以验证通信结构框架的可行性。实验中的机械天线永磁体的体积都在10厘米以下³，工作频率可从0到250 Hz连续可调。实验结果表明，旋转永磁体的近场辐射功率与旋转永磁体体积的平方成正比。线圈的灵敏度与匝数和线圈面积成正比。通过实时控制速度，您可以控制信号的频率并对其进行调制。