Hybrid fractal cross antenna

Abstract

A new fractal geometry of the cross antenna, which belongs to the traveling-wave antenna class and follows the contour of a cross, is presented. In the conventional type of traveling-wave antenna, the total length of the radiating conductor increases as the order of fractal expansion increases, but this increase of the length of the current path degrades the performance of the antenna. To reduce the antenna performance degradation, a hybrid fractal antenna is presented, which divides the entire fractal structure into some smaller ones, and connects each smaller fractal group with a power divider circuit. The secondarily, thirdly, and fourthly expanded hybrid fractal cross antennas are fabricated, and their performances are examined by measurements. The influences of the fractal order on the antenna performance are examined.