Abstract
In this paper, we propose a compact dual-band impedance matching network (DBIMN) for radio frequency (RF) rectifiers. The DBIMN is achieved with a single-stage T-type network, with only three segments of the transmission line. We investigate the closed-form design equations, as a design guideline of the DBIMN. In addition, we propose the design methodology of the rectifier using the DBIMN. For validation, we design two dual-band rectifiers (0.915 and 2.45 GHz), for different input power levels. The rectifier with high input power level, is designed for a wireless power transmission (WPT) system. With a 12 dBm input power, the measured power conversion efficiencies (PCEs) are 81.7 and 73.1% at the working frequencies. The PCEs becomes 69.2 and 64.1% (at −1 dBm input power) for the low-power input rectifier that can be used in an RF energy harvesting (RF-EH) system. The simulated and measured results match each other well. Compared with previous designs, the proposed designs have advantages in compactness and high efficiency.
Highlights
Wireless power transmission (WPT) and radio-frequency (RF) energy harvesting (RF-EH) techniques have attracted much more attention in recent years, because of their potential in powering electrical vehicles, mobile devices [1], Internet of Thing (IoT) nodes [2], and biomedical implanted devices [3], etc
RF-to-direct current (DC) power conversion efficiency (PCE for short) is a pivotal parameter to evaluate the performance of the rectifier
We propose a compact dual-band impedance matching network (DBIMN), consisting of a single-stage, T-type network with only three segments of transmission line
Summary
Wireless power transmission (WPT) and radio-frequency (RF) energy harvesting (RF-EH) techniques have attracted much more attention in recent years, because of their potential in powering electrical vehicles, mobile devices [1], Internet of Thing (IoT) nodes [2], and biomedical implanted devices [3], etc. We propose a compact dual-band impedance matching network (DBIMN), consisting of a single-stage, T-type network with only three segments of transmission line. A. DUAL-BAND IMPEDANCE MATCHING NETWORK DESIGN Fig. 3 gives the schematic of the proposed DBIMN, consisting of a single-stage T-type network. DUAL-BAND IMPEDANCE MATCHING NETWORK DESIGN Fig. 3 gives the schematic of the proposed DBIMN, consisting of a single-stage T-type network This network consists of three segments of transmission line denoted as TL1, TL2 and TL3. Since the input impedance of an open or shorted stub does not have any real part, to satisfy the conjugate matching condition at the common node, the real part of Yin should be equal to the real part of Yin at the two operating frequencies. The efficiency could be possibly further improved by adding a harmonic rejection network to the DBIMN
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