Abstract
In this letter, a compact and efficient dual-band rectifier for radio frequency (RF) energy harvesting is presented. The proposed design utilizes a modified T-section comprising a parallel resonance circuit combination of LC in the shunt arm, which plays a key role in obtaining the resultant dual-band rectifier. The shunt arm provides a shift of the high-frequency point in the clockwise direction on the impedance trace (Smith chart) while maintaining an insignificant shift at the lower frequency. The proposed design is verified through theoretical and simulation studies for different Schottky diodes. The circuit is optimized and fabricated to compensate for undesired parasitic effects and achieve the required rectifier performance. For validation, a dual-band rectifier working at 1.4 and 2.45 GHz is fabricated. The measured results show that with a 3.02 k <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\Omega $</tex-math> </inline-formula> load, the maximum efficiencies of the rectifier achieve 65.0% and 57.0% at 1.4 and 2.45 GHz, respectively with 0 dBm input power.
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