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Abstract
In this paper, we use the SBR/Image method to compute the path loss for different outdoor environments in the commercial area of Taipei. Four types of antenna arrays such as L shape, Y shape, triangular and circular arrays are used in the base station and their corresponding path loss on several routes in the outdoor environment are calculated. Moreover, the genetic algorithm is employed to optimize the excitation voltages and phases for antenna arrays to form proper antenna patterns. The performance in reduction of path loss by the genetic algorithm is investigated for these antenna arrays. By the obtained antenna patterns, we can know the route with the lowest path loss; meanwhile, transmission power using this route in the base station can be reduced. The investigated results can help telecommunication engineers improve their planning and design of microcellular system.