A 2.45‐GHz frequency‐selective rectenna for wireless energy harvesting

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: 73%

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

Noor

Zakaria

Lago

et al. 2019

“…In the far‐field region, the RF to DC conversion efficiency of the proposed rectenna can be calculated by Ref. :

A_{er} = \frac{G_{normalr} {normalλ}^{2}}{4 π}

P_{normalr} = \frac{P_{t} A_{er} G_{normalt}}{4 π D^{2}}

{normalη}_{} = \frac{P_{dc}}{P_{normalr}} \times 100 % = \frac{V_{dc}^{2}}{R_{L} P_{normalr}} \times 100 %

where A er is effective aperture of the proposed antenna, G r is the realized gain of the receiving antenna and λ is the wavelength at the operating frequency, P r represents the received power, P t and G t are the transmitting power and realized gain of the standard horn antenna, D is the far‐field distance, V dc is the measured output voltage of load, R L is the load resistance.…”

Section: Measurement Of Rectennamentioning

confidence: 99%

An efficient fractal rectenna for RF energy harvest at 2.45 GHz ISM band

Shi

Fan

Jing

et al. 2018

A novel efficient rectenna is proposed in this paper for radio frequency (RF) energy harvest from ambience at 2.45 GHz ISM band. A compact fractal antenna is designed based on a Lévy C curve. The performance of antenna with the ground plane of the conventional geometry, the rectangular‐slot geometry and the newly designed geometry is investigated and compared. Besides, a typical rectifier with a 73‐degree radial stub matching network is presented. Simulation and experiment are performed to validate the performance of the presented rectenna. The results indicate that the antenna is characterized with a good matching characteristic with a stable omnidirectional radiation pattern. The rectifier has a relatively high efficiency of 30% under the low input power of −10 dBm. The measured maximum RF to DC conversion efficiency of the rectenna is 70% with the output voltage of 2.2 V at 0 dBm when the input power ranging from −20 dBm to 0 dBm.

“…A rectenna is one of the crucial components in MWPT, 5 which is a combination of an antenna to harvest microwave power and a rectifier to output DC power for wireless sensors. In recently reports, various rectennas have been designed, such as slotted monopole rectenna, 6 shorted patch rectenna, 7 reconfigurable rectenna, 8 and meander line rectenna 9 .…”

Section: Introductionmentioning

confidence: 99%

A compact hollowed‐out loop rectenna without matching network for wireless sensor applications

Jing

Pang

Wang

et al. 2020

In this article, a compact and high-efficiency loop rectenna with matching network elimination for wireless sensor applications at 2.45 GHz is presented. The proposed hollowed-out square loop antenna is designed and directly provides a conjugate matching to a compact voltage-doubler rectifier. The loop rectenna can harvest microwave power without increasing the total size or affecting the performance of a wireless sensor. The experiment results show that the peak microwave-to-dc conversion efficiency of 74% is obtained at 2.45 GHz when the input power is 18 dBm. The dimension of rectenna is 30 × 30 × 1 mm 3 and only with a weight of 0.58 g, which successfully realizes a high power-weight-ratio (PWR). Hence, the proposed rectenna can provide a convenient and practical charging solution for wireless sensors in various applications.