Experimental study demonstrates a 26.9% RF-to-DC conversion efficiency in a 2.1 GHz series-shunt rectifier, indicating viability for targeted wireless energy harvesting.
A two-diode series-shunt rectifier operating at 2.1 GHz was designed, fabricated, and experimentally characterized for wireless power transfer. The circuit uses SMS7630 low-barrier Schottky diodes, distributed microstrip matching sections, a 1.0 µF output capacitor, and a resistive load. Harmonic-balance analysis was performed with a 2.1 GHz single-tone source, while scattering parameters were evaluated from 2.0 to 2.2 GHz. Input power was swept from −25 to +25 dBm and commercially available load resistances from 1 to 10 kΩ were examined. Simulation predicted a maximum RF-to-DC conversion efficiency of 27.7% at +5 dBm with a 5.6 kΩ load. Under the same nominal input-power and load conditions, the fabricated rectifier achieved a measured peak efficiency of 26.9%. The close agreement supports the two-diode series-shunt topology for targeted WPT at moderate RF input power.
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Dhanawade et al. (2026) studied this question.
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