Aiming at the influence of antenna selection on the electromagnetic wave propagation in the tunnels

the ray tracing channel model of rectangular tunnel is established based on the ray tracing method of geometric optics theory. The effects of antenna selection on electromagnetic wave propagation in tunnels at 900

1 500 and2 100 MHz are investigated by simulation and experimental verification. The comparison results show that when the transmitting antenna is a directional antenna in the tunnel

its performance is better than that of the omnidirectional antenna

which is more suitable for the tunnels in the frequency band examined in this paper. The difference in performance between directional antennas and omnidirectional antennas decreases with the increasing frequency. The research in this paper has reference significance for the selection of the transceiver antennas and the selection of the transmitting frequency in the wireless communication system of the actual rectangular tunnel. It also has guiding significance for the antenna selection of other limited spaces

such as mine roadways

underground pedestrian passages

subways

etc.