Design of Efficient and Compact Ultrawideband Rectifier for Sub-6 GHz WPT/EH
Zhen Yue, Xin Xu, Shun Li, Xian Qi Lin, Li Jun Zhong, Min Da Shi
Abstract
This letter presents an efficient and compact ultrawideband (UWB) rectifier for wireless power transfer (WPT) and energy harvesting (EH) systems. The rectifier utilizes the voltage-doubling topology, which can effectively compress load impedance and facilitate broadband impedance matching. The input impedance matching network (IMN) is achieved using an L-type microstrip branch cascaded with a lumped inductor, which can counteract the capacitive of the diodes and reduce the circuit size. The proposed rectifier was designed and fabricated for verification with a 14.3 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\times $ </tex-math></inline-formula> 7.4 mm dimension. The measured results show that the rectifier can provide 197.6% (0.04–6.74 GHz) fractional bandwidth (FBW) with the power conversion efficiency (PCE) exceeding 50% and 196.8% (0.05–6.2 GHz) bandwidth with the PCE exceeding 60% at 22 dBm input power. The peak PCE reaches 74.8% at 1.9 GHz. Compared with traditional UWB rectifiers, the proposed one exhibits the merits of small size, high efficiency, and wider bandwidth.