A Broadband High-Efficiency Rectifier Based on Two-Level Impedance Match Network

Abstract

Abstract-A broadband high-efficiency rectifier with shunt-diode circuit topological structure is presented in this paper. By utilizing the two-level impedance match network, the rectifier can achieve a high microwave-direct current (mw-dc) conversion efficiency within a broad range of operation bandwidth. A stepped microstrip line and a cross-shaped microstrip stub as two-level match network is designed to extend the operation bandwidth. A cross-shaped stub connected to the capacitances act as a dc-pass filter to block the fundamental frequency wave and the high order harmonics and further improve mw-dc efficiency within a broad bandwidth. Experimental results show that the peak conversion efficiency is 80.3% at the frequency of 1.9 GHz when the input power is 22 dBm. When the input power is 19.5 dBm, the bandwidth of efficiency higher than 70% is 40% (1.80 GHz-2.72 GHz). This rectifier has the characteristics of low profile and easy integration, which is suitable for RFIDs, WSNs, and other applications.

Analysis and design of diode physical limit bandwidth efficient rectification circuit for maximum flat efficiency, wide impedance, and efficiency bandwidths

“…Recently, several novel techniques to design very low to high power high-efficiency wideband rectifiers for WPT and EH applications have been investigated 23 – 37 . To cope with the large input impedance variation the design techniques like RF differential two-stage rectifier design 23 , 32 , complex transmission line broadband matching 24 , 26 – 31 , 33 , 35 – 37 , etc., were employed. However, all these works were not only complicated but also came up with complex calculations.…”

Diode physical-limit-bandwidth efficient rectification

“…Consequently, the wideband range of this conventional doubler circuit is limited by the designed matching circuit. Therefore, there is a tradeoff in the power conversion e ciency (PCE) of the recti er for wideband recti er design with the wide-band operating frequency [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] . Alternatively, we propose a novel concept for achieving e cient wideband recti cation without using any external matching circuit as we explain in the succeeding paragraphs.…”

“…Recently, several novel techniques to design very low to high power high-e ciency wideband recti ers for WPT and EH applications have been investigated [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] . To cope with the large input impedance variation the design techniques like RF differential two-stage recti er design 23,32 , complex transmission line broadband matching 24,[26][27][28][29][30][31]33,[35][36][37] , etc., were employed. However, all these works were not only complicated but also came up with complex calculations.…”

“…In all these works, the wideband power conversion e ciency is uctuating throughout the frequency range and possesses low impedance bandwidth (IBW) and e ciency bandwidth (EBW). Authors claimed simple wideband recti er designs had been reported [23][24][25][26][27][28] , but the conversion e ciency in these designs is very low, and the e ciency is uctuating in the frequency range. Besides, at e ciency wideband recti ers have been reported 32,33 , but the EBW is much lower.…”

A Wideband Rectenna Using High Gain Fractal Planar Monopole Antenna Array for RF Energy Scavenging

“…In the best case of input power level, the maximum reported power conversion efficiencies vary from 30 to 70%. However, high efficiency designs are mostly for a relatively high input power (such as levels of 0 dBm [17], 10 dBm [18], 19.5 dBm [19], and 12.8 dBm [20]) which is not suitable for ambient energy scavenging.…”