High gain fractal-based Yagi antenna

In this paper, a new high directivity wire antenna based on the modified 2nd iteration space-filling Peano curve is used as an element in a Yagi-Uda array for WIMAX and WIFI applications. A three elements feeder- reflector-director arrangement is proposed. The whole antenna structure including; the reflector, the feeder and the director has been analyzed and optimized using a full-wave moment-method based simulator IE3D. A directivity of 17.3 dBi has been obtained, which is more directive than the 17 elements 3.2 lambda (15.5 dBi) and the 15 elements 4.2 lambda (16.3 dBi) Yagi-Uda array of dipoles. Moreover, the proposed antenna has a compact size of 66% relative to the 4.2 lambda dipoles array. On the other hand, to match the proposed antenna structure, a Gamma section has been used which results in antenna matching over a bandwidth of 120 MHz, corresponding to 4.6% of the operating frequency.