We analyzed the wave propagation characteristics of the crossroad inside a tunnel, using the boundary-element method. To simplify, the tunnel structure is assumed to be two-dimensional and the side walls to be lossy dielectrics. We could improve the radio communication characteristics between two cross tunnels by a tetragonal reflector placed at the center of the crossroad. The diagonal length of the proper reflector is about 10%–20% of the tunnel width.
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Murakami et al. (1989) studied this question.
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