Sierpinski Carpet Fractal Antenna with Harmonic Suppression Capability

A harmonic suppressed fractal antenna suitable for energy harvesting system is presented. Sierpinski Carpet fractal antenna is designed and developed with the capability to eliminate the harmonics frequencies of the higher order modes. To accomplish this, three open circuit stubs as a stubs-filter have been integrated on the transmission feed line to suppress the frequency from 2 GHz to 5 GHz. This technique is suitable for developing antenna with harmonic suppression or for single band antennas. The antenna is designed on the FR-4 board with the size of 38 mm × 38 mm which operates efficiently at 1.8 GHz, suitable for wireless communication applications. The prototype can suppress undesired harmful harmonic frequencies presents at 3.6 GHz and 4.2 GHz with the observed range. The antenna has a good potential to be used for rectenna system with small size and better performance. Simulation and measurement results obtained are in good agreement, which have confirmed the design concept.