Effect of Crowd on Propagation Characteristic of Electromagnetic Waves in Limited Underground Space

By using the finite element method, the effect of crowd on the propagation characteristic of electromagnetic waves in a limited space such as an underground marketplace and an underground platform is investigated. The calculation result shows that crowd s reflectance coefficient increases but the transmission coefficient decreases with the raise of working frequency. The loss of input power in crowd reaches its maximium value when working frequency is between 200 and 300 MHz.