As the growth of mobile technology network increasing exponentially due to which radio frequency becomes more valuable natural resources. Shortage of bandwidth creates an enormous opportunities for researchers and engineers for exploration of underutilize millimeter wave spectrum in order to design and develop future technologies. It is a need of an hour to do extensive studies on the impact of millimeter wave technologies as both indoor and outdoor environments. This paper describes the various studies carried out earlier in the field of radio wave propagation at 60 GHz in different outdoor environments.

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A Yagi antenna with three fractal Koch curve shaped elements is proposed in this paper. The antenna performances (radiation pattern, return loss and gain) are simulated and compared with these of classical Yagi antenna for the same frequency band. Fractal Yagi antenna features relatively small size and high gain. The return loss is experimentally measured.

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