volume | PIER Journals

Abstract

This paper proposes a compact harmonic communication rectifier for a simultaneous wireless information and power transfer (SWIPT) receiver front-end employing quadrature frequency-shift keying (QFSK) modulation. First, we theoretically analyzed the feasibility of communication using the second harmonic of QFSK signals. Second, a compact harmonic communication rectifier is proposed by combining a frequency-selective duplexer and an impedance-matching network. The duplexer with two output branches partially extracts the low-power second harmonic for communication and fully transmits the fundamental wave for wireless power transfer. The matching network with π-type can transmit the fundamental wave to the diode for rectification and adjust the energy-information power ratio for practical requirements. Finally, the proposed rectifier is fabricated and measured with good agreement between simulation and measurement results. A rectifying efficiency of 76.7% is achieved for QFSK-modulated waves with a carrier frequency of 2.5 GHz and a frequency offset of 20 MHz at an input power of 14 dBm. The extracted second-harmonic power is -5.3 dBm with an energy-to-information power ratio of 64:1. The signal-to-noise ratio (SNR) is 30 dB and the bit error rate (BER) is less than 10^-12.

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Ms. Zhoulin Fan

Dr. Junfei Ji

Dr. Abubaker Ahmed Elobied

Dr. Fan Yu

Prof. Xuexia Yang