A Compact Double Comb Shape Slotted Rectenna for Ambient RF Energy Harvesting.

This article presents a novel 2.45 GHz compact double comb-shaped slotted rectenna system designed to capture RF energy from the environment. The proposed rectenna integrates two comb-like structures into a square patch antenna, and a voltage doubler rectifier circuit with a small footprint, measuring 48x31x1.5mm3. The design features semi-circular slots at the patch center to improve bandwidth and impedance matching, while the double comb structures enhance antenna return loss characteristics and radiation performance. The rectenna prototype was constructed on a 1.5 mm thick, cost-effective FR-4 substrate. Both modeling tools and measurements were used to analyze the rectenna harvesting capacity. The analysis results show a return loss (S11) of -10 dB across a fractional bandwidth of 17.14% between 2.3 GHz and 2.48 GHz. The rectifier circuit achieves a maximum energy conversion efficiency of 83% at 2.45 GHz and an output voltage of 2.2V with a 2 kO load resistance. The analysis of experimental data demonstrates that the proposed rectenna efficiently harvests RF energy from the surrounding environment. [ABSTRACT FROM AUTHOR]