Symbol-Splitting-Based Simultaneous Wireless Information and Power Transfer System for WPAN Applications

A compact system design for simultaneous wireless information and power transfer (SWIPT) based on a novel symbol-splitting (SS)-technique is proposed in this letter. A rat-race coupler is adopted between the receiving terminal and the rectifier to facilitate the separation and isolation of the noninformation-carrying components of the received signal from the information-carrying components for rectification and data recovery, respectively. The maximum conversion efficiency of the design reaches over 60% with −4-dBm input power and remains around 50% down to input powers of −10 dBm in measurements using both continuous-wave (CW) signals and modulated signals with different data rates as inputs. The transferred data are correctly received and recovered at the isolation port of the coupler. The design is
$51.7\times49.3$
mm
²
, and all measurement results show good agreement with the simulation results.