A Temporal Millimeter Wave Propagation Model for Tunnels Using Ray Frustum Techniques and FFT

<table class="table-group" width="800px"><tr class="fig-image" id="a"><td><img alt="172924.fig.008a" src="https://static-preview.hindawi.com/articles/ijap/volume-2014/172924/figures/172924.fig.008a.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(a) </b>Straight tunnel with roughness equal to zero</td></tr></table></td></tr><tr class="fig-image" id="b"><td><img alt="172924.fig.008b" src="https://static-preview.hindawi.com/articles/ijap/volume-2014/172924/figures/172924.fig.008b.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(b) </b>A tunnel with roughness equal to 2 cm</td></tr></table></td></tr></table>

<table>Received power levels with the transmitter’s frequency changed.</table>

International Journal of Antennas and Propagation

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Figure 8

Figure 8: A Temporal Millimeter Wave Propagation Model for Tunnels Using Ray Frustum Techniques and FFT 