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为研究矩形隧道中电磁传输特性,采用傅立叶变换方法推导出垂直方向的电赫兹位与磁赫兹位表达式,借助Matlab软件对隧道各种环境下电场变化情况进行分析.研究结果表明:对水平电偶极子,低频时随着介电常数增大,场强逐渐减小;高频率时,随着介电常数增大电场强度反而增大;随着电导率的增加场强在增大.对垂直电偶极子,随着介电常数增大场强逐渐减小;随着频率的增大场强逐渐增大;随着电导率的增加场强在减小.相同条件下垂直偶极子场强比水平电偶极子场强分量衰减的速度快;在矩形隧道中采用高频水平电偶极子激励方式有利于电磁波的传输与接收.
In order to study electromagnetic transmission characteristics in rectangular tunnels, Fourier transform method was used to derive the expression of electric Hertzian and magnetic Hertzian bits in the vertical direction, and the Matlab software was used to analyze the electric field changes in various tunnels.The results show that: Dipole, the field strength decreases with the increase of dielectric constant at low frequency; the field strength increases with the increase of dielectric constant at high frequency; the field strength increases with the increase of conductivity. The vertical electric dipole decreases gradually with the increase of dielectric constant, the field strength increases with the increase of frequency, and decreases with the increase of conductivity.The vertical dipole The field strength is faster than the horizontal electric dipole field strength component attenuation; the use of high-frequency horizontal dipole excitation in a rectangular tunnel is conducive to electromagnetic wave transmission and reception.