矩形弯曲隧道中电磁波的传输特性分析
Analysis of Transmission Characteristics of Electromagnetic Wave in Rectanglar and Curved Tunnel
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摘要: 由矩形弯曲隧道中电磁波沿水平方向极化模式的各场分量出发,应用边界条件得到了在弯曲隧道中电磁波传播的衰减率公式,从而得到了弯曲隧道中电磁波传播衰减率与弯曲半径之间的关系曲线和衰减率与频率之间的变化曲线。结果表明,弯曲的存在,极大地增加了电磁波传播的衰减率。在弯曲半径不变的情况下,当频率增加超过一定值时,衰减率会随着频率的增高而变大,而变化的幅度与弯曲半径有关,半径越小,衰减率增加得越快。在曲率半径较小时,频率越高,电磁波的衰减率越大,但当曲率半径大于一定数值时,则频率越高,电磁波的衰减率越小。Abstract: From the field components of polarization mode along the horizontal direction in(rectanglar) and curved tunnel,the formula of attenuation rate of transmission of(electromagnetic) wave was deduced under the condition of boundary,thereby the relation curve between attenuation rate of transmission of(electromagnetic) wave and bend radius and the changed curve between attenuation rate of transmission of(electromagnetic) wave and frequency were gotten.The results indicated that the attenuation rate of trans-(mission) of electromagnetic wave would greatly increased if curve exists.Under the condition of bend radius constant,the attenuation rate would increase along with frequency if frequency exceeds over a certain(value.) And its changing range relates with bend radius,the smaller the radius is,the quicker the atten-(uation) rate increases.If curvature radius is small,the higher the frequency is,the larger the attenuation rate is.But when curvature radius is large than a certain value,then the higher the frequency is,the smaller attenuation rate is.