Design of Compact and High-Efficiency Broadband Rectifier With Harmonic Suppression Transferring for Biomedical Implants Applications

This paper presents a novel structure of broadband rectifier for biomedical implant applications with a wideband second harmonic suppression mechanism. Specifically, two band-stop structures realized by LC parallel resonators at two center frequencies of each half bandwidth are employed to provide second harmonic suppression transferring across the overall bandwidth, which improves power conversion efficiency (PCE) as a result of power recycling. A HSMS2850 Schottky diode-based broadband rectifier is designed, simulated, fabricated and measured showing that the rectifier has high PCE over 50% in a fractional bandwidth of 57.28% from 0.76 GHz to 1.37 GHz at 4.5 dBm input power with highest PCE of 71.2%. Moreover, the rectifier achieves wide 50%-over PCE dynamic range of about 21 dB while having a very compact size of 13mm x 7mm which is suitable for biomedical implant devices.