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基于FEKO7.0建立了矿井无线透地通信磁场模型,设计了3种体积不同、匝数不同但输入电阻相同的铁氧体磁性天线,研究了该模型在地面上的磁场分布情况,频率采用甚低频15 k Hz。结果表明:这3种铁氧体模型在地面上产生了3种不同数量级的磁场强度,并采用竖直和水平两种安装方式,其量值都在电磁传感器可以检测到的范围内。研究发现,地面产生磁场强度的大小与铁氧体天线的体积和放置形式有关,水平放置比竖直放置产生了较大的磁场强度。因而,利用磁场代替调制电磁波作为矿井无线透地通信的传输媒介是可行的。
Based on FEKO7.0, a magnetic field model of mine through-the-air communication was established. Three kinds of ferrite magnetic antennas with different sizes and different numbers of turns but the same input resistance were designed. The distribution of the magnetic field on the ground was studied. Low frequency 15 k Hz. The results show that the three kinds of ferrite models have three kinds of magnetic field strengths on the ground, and they are installed in vertical and horizontal modes. The magnitude of these three kinds of ferrite models are within the range that can be detected by the electromagnetic sensors. It is found that the magnitude of the magnetic field generated by the ground is related to the volume and placement of the ferrite antenna. Horizontal placement produces greater magnetic field strength than vertical placement. Therefore, it is feasible to use the magnetic field instead of modulating the electromagnetic wave as the transmission medium of mine through-the-air communication.