A novel compact multiband antenna on fractal geometry for ambient RF energy harvesting in the LTE/GSM, UMTS and WIFI bands

In this paper a multiband antenna is presented for radiofrequency energy harvesting. The antenna is designed by creating slots on the radiating element. We used Koch's fractal geometry to create iterations on the radiating element. Our proposed antenna operates in the four bands (800 MHz from GSM and LTE, 1800 MHz from GSM, 2100 MHz from UMTS and 2400 MHz Wifi). The design of this antenna allowed to obtain a greater bandwidth with the third iteration of the fractal geometry around the resonance frequencies. For a threshold of -10 dB, we moved from the 20 MHz bandwidth of the slot-less antenna to the 67.4 MHz bandwidth of the antenna with the third iteration for the 2400 MHz frequency. We also noted a gain varying between 0.61dB and 5.11dB.