Two-stage Sierpinski monopole antenna with four triangular complements

A new multiband antenna based on the traditional fractal equilateral Sierpinski monopole is presented in this paper. Sierpinski monopoles are resonant, log-periodic and multi-band antennas. For example, a traditional two-stage Sierpinski monopole provides three bandwidths. In this work, two of these bandwidths are increased adding four conductor triangles to a traditional two-stage Sierpinski monopole and eliminating four connections between the triangles that shape such antenna. The resultant two-stage Sierpinski monopole antenna with four triangular complements matches to a 50 Ohm feeding at lower frequencies than the traditional two-stage Sierpinski monopole does. For VSWR < 3, the proposed antenna provides bandwidths from 0.294 GHz to 0.300 GHz, from 0.515 GHz to 0.782 GHz and from 1.38 GHz to 11.0 GHz. The proposed antenna was simulated using an FDTD program and a good agreement between simulated and measured results was observed.