This brief presents a model for the input impedance of the RF rectifiers during charging. It uses a power-based method and finds a closed form equation for the transient variation of the input impedance. To validate the model, a typical single stage rectifier is designed using Schottky diodes and simulated at 900 MHz using ADS. The simulation results show a good agreement with the proposed model. Moreover the rectifier is realized on PCB. The measurements agree well with the values calculated using the model which further confirms the proposed model.
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Shieh et al. (2017) studied this question.
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