A novel meander line integrated E-shaped rectenna for energy harvesting applications

This paper, a two-and four-element linear array of capacitively coupled microstrip patch antenna have been presented for 5.8 GHz wireless power transfer application. Initially, a 5.8 GHz matched rectifier has been designed that produces maximum 1.54 V output voltage across a 1.8 kΩ load for 4 dBm input power. The maximum calculated efficiency is found to be 52.70%. The rectifier was then connected with a spurious free antenna to form a rectenna, which provided 0.39 V output voltage across the load and maximum 34.34% efficiency for received power of 0.246 mw. Since efficiency was found low, next, an attempt has been made to increase the efficiency by increasing antenna gain. To do this, a two-element and a fourelement linear array of the antenna have been formed and connected with the rectifier to form the rectennas. To suppress spurious responses of arrays C-shaped slot etched on ground and U-shaped stub is placed at microstrip feed line. The two-and four-element array showed 11.4 dB and 15 dB gain, respectively, at 5.8 GHz (compared to 4.17 dB of the single element antenna). Maximum output voltages and efficiencies of the rectenna formed using two and four-element arrays are 0.83 V, 0.915 V and 45.06%, 52.55% respectively.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Capacitive coupled circular patch antenna based rectenna systems for 5.8 GHz wireless power transfer applications

Pattapu

Das

2021

“…Since, the received power of the antenna is responsible for efficient operation of the RF energy harvesting system, it becomes essential to utilize an antenna with quite good efficiency and reasonable gain. In order to maximize the received power without substantially increasing its overall size, the researchers have implemented various attractive techniques in antenna design . After taking into consideration various factors for the efficient antenna design, the design of the rectifying circuit, comprising of the rectifier and the matching unit, is quite important in order to provide maximum RF to dc conversion efficiency .…”

Section: Introductionmentioning

confidence: 99%

“…In order to maximize the received power without substantially increasing its overall size, the researchers have implemented various attractive techniques in antenna design. [3][4][5][6] After taking into consideration various factors for the efficient antenna design, the design of the rectifying circuit, comprising of the rectifier and the matching unit, is quite important in order to provide maximum RF to dc conversion efficiency. 7 The ideal matching unit in the rectifying circuit should be able to facilitate the conversion of maximum available ambient RF power to DC voltage at the load terminal.…”

Section: Introductionmentioning

confidence: 99%

An efficient dual‐band rectenna using symmetrical rectifying circuit and slotted monopole antenna array

Chandravanshi

Akhtar

2020

In this article, an efficient dual‐band rectenna making use of the newly proposed symmetrical rectifying circuit working at the frequency of 1.8 and 2.45 GHz, is proposed. The proposed dual‐band rectifying circuit is combined with an array of compact wideband planar monopole modified circular slot antenna in order to facilitate the efficient rectenna design. The rectifying circuit employs symmetrical matching network in addition to the symmetrical rectifier thereby facilitating the suppression of the odd order harmonics. This eventually results into the higher output voltage as compared to the conventional rectifier circuits. Moreover, the dual‐band topology of the proposed rectenna increases the overall voltage by harvesting energy from two independent RF sources. The measured results of the fabricated structure show that the maximum RF to dc conversion efficiency of the proposed rectifier circuit reaches up to 70% at 9 dBm input RF power. From application point of view, the proposed rectenna circuit is tested to extract the RF energy from 1.8 GHz cellular and 2.45 GHz Wi‐Fi bands to energize a low‐power LED. The overall rectenna structure is reasonably compact providing good performance, which can potentially be employed for efficient wireless power transmission system.

“…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 . In these designs, impedance matching networks are a vital part to use standard antennas with 50 Ω impedances to match with rectifying circuits, and eliminate the second harmonics achieving higher conversion efficiency 10 .…”

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.