Atmosphere absorbs the electromagnetic wave so that the radar detection distance be reduced, and the atmospheric unusual refraction changes the radar detection distance too.
大气环境对电磁波的吸收衰减作用使雷达的作用距离减小,大气异常折射现象使雷达的作用距离增大或减小。
It shows that,for the one-dimensional photonic crystals,there are abnormal refraction in the first band.
结果表明,对于一维光子晶体,在第一能带内,存在反常折射现象。
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