Application of Sierpinski Fractal Slot in Antipodal Vivaldi Antenna

The development of an antipodal Vivaldi antenna implementing the Sierpinski arrowhead curve slot for head imaging is presented in this paper. The proposed antenna has an overall dimension of 65 x 65 x 1.6 mm
³
using Roger RO4350B as a substrate. The proposed antenna can produce a better reflection coefficient under -30 dB and higher gain achieving 7.35 dBi compared with the antenna without the fractal slot. It is also reported that the application of the fractal slot does not alter the antenna’s performance, which could interfere with the antenna design that already met the head imaging criteria.