随着移动通讯的迅速发展,可用的频段相继向上发展,国外移动通信已使用了900MHz频段,我国民用移动通信也由150MHz向450MHz频段推进,不久将来也会使用900MHz频段,开拓900MHz频段也是必然趋势。本文通过下述内容比较150MHz,450MHz和900MHz电波传播特性:1.可用覆盖区域和散乱反射特性比; With the rapid development of mobile communications, the available frequency bands have been gradually developed. The foreign mobile communications have already used the 900MHz frequency band. China’s civilian mobile communications have also been promoted from 150MHz to the 450MHz frequency band. In the near future, the 900MHz frequency band will also be used. It is also an inevitable trend to open up the 900MHz frequency band . This article compares the propagation characteristics of 150MHz, 450MHz and 900MHz radio waves by: 1. Available coverage area and scattered reflection ratio;