Modified Sierpinski fractal antenna

A two layer stacked Sierpinski patch antenna design is presented which shows improved return loss and radiation properties. A modified stacked Sierpinski patch antenna obtained by merging the top grid layer with the fractal antenna is presented. This resulted in an additional resonance but has a very poor return loss. Truncating the corner of the Sierpinski structure helped to improve the return loss. A gap structure was analyzed next to obtain an increase in bandwidth. The gap is introduced along the non-radiating edge of the antenna. The effect of the gap is more noticeable at higher frequencies. This also produced patterns that were more omnidirectional. The proposed designs provide more parameters allowing one to control the resonances and the patterns. The work could be extended to third and forth order fractals.