Extended Dynamic-Range and High-Efficiency Rectifier Based on Adaptive Power Distribution and Synthesized Low-Pass Matching Network

Abstract

This paper presents a novel methodology for designing a rectifier with high efficiency and wide dynamic range (DR). Specifically, the proposed structure employs a combination of two diodes which are optimized for operation at distinct power levels. These diodes are switched automatically according to input power level during rectifying process based on a simple adaptive power distribution (APD) mechanism, which is intimately related to the diode’s input impedance and is mathematically analyzed, for DR extension. In addition, a low-pass two-stage matching network is implemented instead of the conventional matching network for simultaneous fundamental matching and multi-harmonic suppression, enabling an efficient power recycling operation which, as a result, further enhances power conversion efficiency (PCE). A rectifier using two types of the Schottky diode (HSMS2850&HSMS2860) is designed, simulated and measured at 915 MHz for verification. The measured results shows peak PCE of 75.5% at an input power of 9.5 dBm and an enhanced DR of 21.5 dB for PCE $>50\%$ while having a compact size, indicating a superior performance, as compared to other designs.

Keywords

• Adaptive power distribution
• harmonic suppression
• low-pass matching networks
• power recycling
• wide dynamic-range rectifiers