Figure 8
From: Efficient and Sensitive Electrically Small Rectenna for Ultra-Low Power RF Energy Harvesting
Rectifier’s input impedance (real (Re) and imaginary (Im) part) versus frequency for various levels of power input (a), rectifier’s RF-to-dc efficiency versus power input at 868 MHz (b), versus frequency (c) and versus load at 868 MHz (d) for various levels of power input. At (a–c) the output load was fixed at 2193 \({\rm{\Omega }}\), while at (b–d) source was impedance matched to the rectifier (i.e., \({Z}_{{\rm{s}}}=135+j507\)). All the results are based on simulations.
