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Table 1 Equipment characteristics and measurement parameters.

From: Propagation in Tunnels: Experimental Investigations and Channel Modeling in a Wide Frequency Band for MIMO Applications

Frequency band 2.8–5 GHz
Number of frequency points 1601
Antenna Biconical antenna (Electrometrics EM-6116)
Transmitter power 20 dBm
Dynamic range >100 dB
Position in the transverse plane 12 positions every 3 cm (λ/2 at 5 GHz)
Positions along the longitudinal axis From 50 m to 202 m every 4 m
  From 202 m to 500 m every 6 m
Number of acquisitions at each position 5