Helix parameters optimization for Wi-Max applications

Wi-Max is the fourth generation of high speed broad band internet connection. With a suitable antenna it can cover L.O.S. thirty miles with 5 GHz at the speed of 70 Mbps. It will be available to the public at very low monthly subscription, thus, over riding the high cost of internet connection . The key element for Wi-Max applications is the construction of a proper beam forming antenna. In this article we introduce a special optimized tapered helix antenna which can direct the beam in the desired direction. Our preliminary optimization shows that a tapered helix with 11 turns, 11 inches height, and 1.5 centimeter spacing between turns, can yield a gain of 13.5 dbi with 3 db beam width of 30° which are quite satisfactory for Wi-Max applications. It is shown that simulation and theoretical results are in good agreement.