Abstract
In this paper, a new tri-band rectenna is presented for radio frequency energy harvesting (RFEH) deployment. The proposed RFEH system integrates two primary components: an antenna and a rectifier. First, the antenna consists of a CPW-fed circularly-shaped patch incorporating three slots. Each slot is strategically introduced to reject a specific band. Second, the rectifier circuit is structured to ensure an efficient RF-to-DC conversion over three bands. High efficiency peaks are achieved at 78%, 76%, and 60% respectively at 3 GHz, 4 GHz, and 6.5 GHz, under 5 dBm input power, with overall efficiency average exceeding 71%. Peak DC output voltages of 2.52 V, 2.47 V, and 2.20 V are obtained at the same frequencies under the same conditions. The results confirm that the proposed rectenna effectively spans both the 5G mid-band and Wi-Fi 6E band, enabling the simultaneous and reliable powering of low-power devices. Furthermore, the antenna exhibits high frequency repeatability, achieved through the independent tuning of each band via strategically integrated slots.