Propagation at mmW Band in Metropolitan Railway Tunnels

Table 1

Set-up parameters.

Frequency	24.2 GHz
Transmitted power	5.4 dBm
Tx signal	Continuous wave
Tx and Rx antenna	Horn antenna, 15.2 dBi
HPBW antenna	-plane 28.3°
	-plane 27.9°
Antenna polarization	Horizontal and vertical
Tunnel cross-section	Arched
Tunnel dimensions	6.9 m × 4.9 m
Train speed	5 km/h