A Compact and Efficient RF Rectifier Using Series-Parallel LC Network for UHF Battery-Less RFIDs

• Published in: IEEE sensors letters 2024-06, Vol.8 (6), p.1-4
• Main Authors: Pathak, Deepali, G, SriHarsha Vardhan, Dutta, Ashudeb
• Format: Article
• Language: English
• Subjects: diode model; Efficiency; Energy conversion efficiency; Impedance; impedance matching; Network topology; power conversion efficiency (PCE); power dynamic range; Radio frequency; radio frequency (RF) energy harvesting (RFEH); rectenna; Rectifiers; Schottky diodes; Thermal sensors; Topology; Ultrahigh frequencies; Voltage
• ISSN: 2475-1472; 2475-1472
• DOI: 10.1109/LSENS.2024.3406576

This letter proposes a wide input power range compact and efficient rectifier for harvesting ambient radio frequency (\text{RF}) energy from 915 MHz ultrahigh frequency (\text{UHF}). An L -match series and parallel topology have been designed and compared to not only boost the received input power but also to produce a highly efficient network to hold a broad input power range. This letter demonstrates theoretically and practically that a parallel network is more efficient than a series network due to greater harmonic suppression results in an improvement of 3%-8% efficiency throughout a power range of 26 to 12 dBm at a desired frequency. The design utilizes multidiode (SMS-7630, HSMS-2850, and HSMS-2862) approach to achieve higher efficiency over a wide input power range. From the measurements, the proposed series L -match rectifier achieves peak power conversion efficiency (PCE) of 75% at 4 dBm with 35 dB of wide input power range from −23 to 12 dBm with >20\%, respectively, whereas the proposed parallel L- match rectifier achieves peak power conversion efficiency of 79% at 4 dBm with 38 dB of wide input power range from −26 to 12 dBm with >20\% in an area of 1.8 × 2 \text{cm}^{2}, respectively.