Investigation of the focusing properties of some fractal arrays

Many medical and industrial applications require focusing of microwave radiation in the near field of the radiating antenna. Antenna arrays are suitable and flexibel in such applications. Fractal antennas and arrays are finding much interest in recent years for the benefits they offer over conventional ones. The feasibility of deploying the fractal principle to focused arrays is demonstrated. The properties of fractal array whose elements are spatially distributed according to the binary tree fractal are investigated and compared with those of conventional array. Computer simulations results show that focused fractal array can have similar focusing properties while having favorable ones.