Nonharmonic Dual-Band Simultaneous Wireless Information and Power Transfer Receiver Based on Signal Reflection

This article introduces a nonharmonic dual-band receiver architecture based on signal reflection for simultaneous wireless information and power transfer (SWIPT) systems. The architecture includes a dual-band 3 dB hybrid coupler (operating at <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\omega _{1}$</tex-math> </inline-formula>, <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\omega _{2}$</tex-math> </inline-formula>), rectifiers (<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\omega _{1}$</tex-math> </inline-formula>), and information processing devices (<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\omega _{2}$</tex-math> </inline-formula>). Leveraging the property that radio frequency (RF) signals are transmitted in the passband and reflected in the stopband, along with the coupler’s port reciprocity, RF power and information signals at different frequencies can be output between the through/coupled and isolation ports with high isolation. This arrangement can effectively reduce the interference of high-power RF energy on information signals while maximizing the utilization of RF energy improving the overall system efficiency. To validate the proposed architecture, a dual-frequency SWIPT receiver operating at 2.45 and 5.8 GHz was designed and fabricated. The simulations and experimental validations confirm that the proposed receiver can achieve 80.4% power conversion efficiency (PCE) with 25 dBm input power, and the isolation between the power and information signals reaches up to 55 dB. The receiver can achieve efficient energy conversion with minimal interference to the information signal. Additionally, we further discuss the feasibility of the signal reflection-based SWIPT receiver architecture for broadband information signal processing, expanding the practical application value of the receiver in SWIPT systems.