A Novel M-Type Communication Coil Antenna in Near Field Simultaneous Wireless Power and Data Transfer System

A novel wideband M -type communication coil antenna is designed for data transfer in simultaneous wireless power and data (SWPDT) transfer system. The proposed M-type communication coil antenna is with symmetric bipolar structure and shared the same aperture with the wireless power transfer coil antenna, therefore high isolation between proposed coils and power coils is achieved. Comparing with the traditional double D (DD) coil, the proposed M-type coil has higher self-resonating frequency, which is suitable for designing high frequency wide band near field magnetic communication link. Based on filter theory, the filtering coil antenna coupling structure is designed. A LC band-stop filter is further designed to enhance the suppression of the wireless power transfer (WPT) leakage signal. A magnetic communication coupling structure based on the M -type coil with 20 mm coupling distance and 57.5 mm radius for a 25-W WPT scenario is designed and fabricated. Measurement shows that the − 3 dB bandwidth of the magnetic communication coupling structure is 10 MHz with center frequency at 21.5 MHz, and the harmonic interference of the WPT is significantly reduced.