The site-specific radio wave propagation prediction in outdoor is increasingly important for electromagnetic interference analysis. Since the outdoor environment is usually very complex and electrically large, the shooting and bouncing ray (SBR) method (one technique of ray tracing) rather than other numerical methods such as finite difference time domain method and finite element method, is often applied in the computation. However, a large amount of rays have to be launched to guarantee the accuracy in conventional ray tracing methods. This, in turn, increases the simulation time significantly. Recently, many acceleration algorithms have been reported including space partitioning and wavefront decomposition. This paper presents a novel adaptive ray launching (ARL) method based on the pattern of transmitting antenna, which reduces the launched ray number significantly while maintaining the computation accuracy
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