人群对地下有限空间电磁波传输特性的影响

Effect of Crowd on Propagation Characteristic of Electromagnetic Waves in Limi ted Underground Space

用有限元方法研究了人群对地下商场、地铁站台等有限空间的电磁波传输特性的影响 .根据计算结果得出如下结论 :随着工作频率的提高 ,人群的反射系数增加 ;而透射系数随着工作频率的提高而降低 .损耗在人群中的入射功率比例在 2 0 0～ 30

By using the finite element method, the effect of crowd on the propagation chara cteristic of electromagnetic waves in a limited space such as an underground mar ketplace and an underground platform is investigated. The calculation result sho ws that crowds reflectance coefficient increases but the transmission coeffici ent decreases with the raise of working frequency. The loss of input power in cr owd reaches its maximium value when working frequency is between 200 and 300 MHz .