A method to calculate the conversion efficiency of a rectenna

The article presents a dual-band aperture-coupled rectenna for radio frequency (RF) energy harvesting at 2.45 and 5 GHz application. The rectenna consists of a dual-band π-shaped slot-etched aperture-coupled antenna, designed at the lower substrate of two FR4 substrate layers and a dual-band rectifier. The proposed antenna design also introduces the harmonic suppression of third-and higher order harmonics, ranging from 6 up to 10 GHz from the asymmetrical stubs design at the transmission feedline. The dual-band rectifier is designed to operate at 2.45 and 5 GHz frequency, successfully achieving high conversion efficiency at 68.83% and 49.90% with the optimum load resistor of value 700 Ω and 1.1 kΩ. The minimum DC voltage of 0.167 and 0.236 V with 0 dBm RF input power can be increased when greater RF power is being applied to it, increasing its flexibility to cater various low-power applications. K E Y W O R D Sdual-band aperture-coupled, dual-band rectifier, energy harvesting, rectenna

Section: Resultsmentioning

confidence: 99%

Section: Comparison With Previous Workmentioning

confidence: 89%

Dual-band aperture-coupled rectenna for radio frequency energy harvesting

Noor

Zakaria

Lago

et al. 2019

“…Antenna is an essential stage in a wireless power transmission system in which the RF energy in the environment is taken to be converted into DC voltage for the battery supplies or uninterruptible power supply electrical charger devices . The antenna design should have a gain and reception performance to be used for RF harvesting systems.…”

Section: Microstrip Antenna Designmentioning

confidence: 99%

“…As in Refs. , in the literature there are many rectifier design and efficiency development studies using different Schottky diodes or CMOS packages or antenna designs.…”

Section: Introductionmentioning

confidence: 99%

Design and realization of an ultra-low power sensing RF energy harvesting module with its RF and DC sub-components

Partal

Belen

Partal

2019

Herein, design, development, and analysis of ultra-low power sensing energy harvesting modules and their subcomponents for ISM band applications have been studied with a holistic approach in an effort to achieve a feasible and high efficient RF energy harvesting performance. The complete harvester system designed and developed here consists of a zero-bias RF energy rectifying antenna (rectenna), DC boost converters and energy storage super-capacitors. Compared with the counterpart energy sources, the surrounding or transmitted wireless energy has low intensity which requires designs with high efficiency. To achieve a successful harvester performance, rectifier circuits with high sensitivity Schottky diodes and proper impedance matching circuits are designed. Dedicated RF signals at various levels from nanowatts to miliwatts are applied at the input of the rectenna and the measured input power versus the scavenged DC output voltage are tabulated. Furthermore, by connecting the rectifier to a high gain antenna and using a RF signal transmitter, the wireless RF power harvesting performance at 2.4 GHz was tested up to 5 m. The performance of the rectenna is analyzed for both low-power detection and efficiencies. Impedance matching network is implemented to reduce the reflected input RF power, DC to DC converters are evaluated for their compatibility to the rectifiers, and super-capacitor behaviors are investigated for their charging and storage capabilities. The measured results indicate that a wide operating power range with an ultra-low power sensing and conversion performance have been achieved by optimizing the efficiency of the Schottky rectifier as low as −50 dBm. The system can be used for battery free applications or expanding battery life for ultra-low power electronics, such as; RFID, LoRa, Bluetooth, ZigBee, and low power remote sensor systems. K E Y W O R D S rectenna, RF energy harvesting, Schottky diode, ultra-capacitor, wireless power transfer 1 | INTRODUCTIONThe harvested RF energy is a potential solution for low power wireless communication networks and can increase battery life or allow battery-free operations. ISM/SRD (Industrial, Scientific and Medical/Short Range Devices) applications typically utilize low power wireless RF communication modules, such as ZigBee, Bluetooth, and RFID. RF Energy Harvesting applications require long-lasting and low profile circuits and limited environmental impacts.A typical RF energy harvester design's main part is a rectenna module. A rectenna consists of a rectifier circuit and an antenna with filtering/matching network.Several techniques have been proposed to improve the efficiency of a rectenna system. 1 As discussed in Ref. 1, the design of a high gain and multiband antenna, and then using it as an array antenna will increase the RF energy captured wirelessly. A voltage multiplier and a multistage rectifier topology will increase the converted DC voltage. Finally, for a passive (non-bias) process, low-voltage zero biased

“…Another important issue is that some devices can be in a difficult location to reach physically, for instance, space, wild life and high attitudes in mountains can be counted. Under these conditions, EH systems emerge as an up and coming technology for powering the low scale and low power devices, too 22 . Another motivation for RF energy harvesting systems is that the rising trend of operational RF bands with the developing technology.…”

Section: Introductionmentioning

confidence: 99%

Design and implementation of a dual band bioinspired leaf rectenna for RF energy harvesting applications

Çelik

Kurt

2021

In this article, both design and implementation of a novel Omni‐directional bioinspired Linden leaf‐shaped rectenna are reported. The antenna is designed for the energy harvesting purposes under the operation frequency range between 1.6 and 2.65 GHz with a second harmonic rejection property. At the rectifier stage, voltage doubler circuit is designed and implemented with the help of microstrip transmission lines, which are used for impedance matching procedure between the antenna and the rectifier for the optimum power transfer from the antenna to the load for the operation dual bands of universal mobile telecommunication service and WIFI. In the design, SMS7630Schottky diodes, high frequency capacitors and inductors are used as the main surface mount devices. The FR4 epoxy material is selected as a substrate material for both the antenna and the rectifier circuit due to its low cost and easy—production scheme. The maximum efficiency value realized at the dual band operation is 42% at the 0 dBm input power level. The output voltage value and the harvested power at this point are nearly 960 mV and 0.42 mW with an optimum load RL = 2.2 KOhm. The implemented system can be used efficiently for the RF energy harvesting applications for the proposed frequency bands.