Novel L-Slot Matching Circuit Integrated with Circularly Polarized Rectenna for Wireless Energy Harvesting

Abstract

Radio frequency (RF) power harvesting allows wireless power delivery concurrently to several remote RF devices. This manuscript presents the implementation of a compact, reliable, effective, and flexible energy harvesting (EH) rectenna design. It integrates a simple rectifier circuit with a circularly polarized one-sided slot dipole antenna at 2.45 GHz Industrial, Scientific, Medical (ISM) frequency band for wireless charging operation at low incident power densities, from 1 to 95 μ W/cm 2 . The rectenna structure is printed on a single layer, low cost, commercial FR4 substrate. The integration of the rectifier and antenna produces a low-profile and high performance circularly polarized rectenna. In order to maximize the system efficiency, the matching circuit introduced between the rectifier and antenna is optimized for a minimum number of discrete components and it is constructed using multiple of L-slot defects in the ground plane. For a given input power of − 6 dBm intercepted by the circularly polarized antenna with 3 dBi gain, the peak RF-DC (radio frequency-direct current) conversion efficiency is 59.5 % . The rectenna dimensions are 41 × 35.5 mm 2 . It is demonstrated that the output power from the proposed rectenna is higher than the other published designs with a similar antenna size under the same ambient condition. Thanks to its compact size, the proposed rectenna finds a range of potential applications for wireless energy charging.

Passive Wireless Measurement System Based on Wireless Power Transfer Technology

“…The system needs more power for data transmission, especially the data collector. Moreover, the accuracy of information transmission is lower than that of wired transmission [3].…”

“…In the era of rapid development of the Internet of Things (IoT), data acquisition systems have been widely applied in all walks of life [1][2][3], including biomedicine, engineering construction, and industrial manufacturing [4][5][6]. In the process of data acquisition, both information and power need to be transmitted through wires.…”

“…In order to achieve wireless data transmission, the common methods are 4G network, Bluetooth, RFID, and so on [3,12,13]. These ways can realize wireless information transmission in different areas, but they also bring other problems with them.…”

“…(1) The power of data collectors is supplied by batteries [3,10]. Batteries can provide stable power for the system.…”

“…It is difficult to meet the power consumption of the data collector and the information transmission circuit. (3) The data collector is powered by wireless power transfer (WPT) [7,16,17]. Sufficient power can be offered by WPT, but receiving coils and adjustment circuits need to be added to the data collector.…”