A Multiband Compact Flexible Energy Collector for Wearable or Portable IoT Devices

Wang, Chenchen; Zhang, Jinling; Bai, Shuobing; Chang, Dunyu; Duan, Lian

doi:10.1109/lawp.2023.3235918

Cited by 13 publications

(4 citation statements)

References 12 publications

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“…A compact circularly polarized beam-switching system is designed for efficient wireless power transfer at 2.4 GHz [5]. Achieving optimal power transfer from antenna to rectifier requires careful impedance matching techniques for single-band [6][7][8][9][10][11][12][13][14][15][16][17][18][19], broadband [20][21][22][23][24][25], dual-band [28][29][30], and multiband [31][32][33][34] rectifiers. The input impedance of RF-DC rectifiers changes nonlinearly with input power due to rectification components, necessitating meticulous design for effective impedance matching across a wide power range [20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

A Novel Design of Broadband Circularly Polarized Rectenna With Enhanced Gain for Energy Harvesting

Kumar Bairappaka,

Ghosh,

Kaiwartya

et al. 2024

IEEE Access

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Device-to-device communication in the Internet of Things (IoT) enables seamless data exchange, aiding automation, monitoring, and control. Yet, sustainability challenges arise due to energylimited devices. This paper presents a novel method for Indoor IoT sensors to function without batteries. A broadband rectenna on low-cost FR4 substrate is proposed, mitigating battery constraints. It integrates a circularly polarized (CP) antenna with an Artificial Magnetic Conductor (AMC) and a RF-to-DC rectifier. A coplanar waveguide fed CP (CPW-CP) antenna achieves a broad axial ratio bandwidth (ARBW) of 19.6% (AR < 3 dB) spanning from 2.3 GHz to 2.8 GHz, boosting gain from 0.5-0.8 dBic to 5-6.5 dBic within the ARBW, courtesy of the AMC integration. A stable RF-DC rectifier, using a modified wideband resistance compression network (WRCN), attains a power conversion efficiency (PCE) exceeding 30% for input powers ranging from -10 dBm to 12 dBm, peaking at 65% for 7 dBm input power for a 2 kΩ load. PCE variation within ARBW is only 5-8%. The RF-DC rectifier is integrated with the enhanced gain CPW-CP antenna to form a rectenna which is fabricated and measured. The experimental results comply with the simulated results, and the experimental validation demonstrates the rectenna's effectiveness in charging a 0.1 pF capacitor within 2 ms in an indoor environment equipped with a Wi-Fi router. This innovative design marks a promising step towards addressing energy constraints in IoT devices, facilitating their long-term operation and deployment in diverse settings. INDEX TERMSCircularly polarized (CP) antenna, Artificial magnetic conductor (AMC), RF-DC rectifier, Power conversion efficiency (PCE), Wideband Resistance compression network (WRCN), RF energy harvesting.

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Section: Introductionmentioning

confidence: 99%

A Novel Design of Broadband Circularly Polarized Rectenna With Enhanced Gain for Energy Harvesting

Kumar Bairappaka,

Ghosh,

Kaiwartya

et al. 2024

IEEE Access

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“…Therefore, some researches have employed broadband and multi-frequency rectenna to harvest more energy. A four-band flexible rectenna operating at 900 MHz, 1800 MHz, 2.45 GHz, and 5.8 GHz is proposed in [9]. The receiving antenna adopts a novel feeding structure composed of coplanar waveguide and transition section, and the rectifier circuit adopts a matching network based on a cross-shaped bending short line to realize broadband.…”

Section: Introductionmentioning

confidence: 99%

A Compact Loop-shaped Dual-band Omnidirectional Rectenna for RF Energy Harvesting

Li,

Xu,

Cao

et al. 2024

PIER M

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This paper presents a compact loop-shaped omnidirectional rectenna for RF energy harvesting at 2.45 GHz and 5.8 GHz. Firstly, a loop-shaped antenna with iterated circular concave and convex structures is proposed to operate at both frequencies. Then, a rectifier circuit uses a complex impedance correlation matching technique to achieve high conversion efficiency. By connecting a piece of microstrip, two uncorrelated input impedances are transformed into a pair of conjugate impedances. In addition, by using a Π-shaped structure with the same equivalent characteristic impedance and complementary equivalent electrical lengths at both frequencies, the pair of conjugate impedances are simultaneously matched to 50 Ω. The rectifier circuit is integrated in the loop-shaped antenna to form a compact dual-band rectenna. The overall size of the rectenna is 67.5 mm × 71.5 mm × 1.016 mm. The test results show that the S11 of the antenna is −13.5 dB and −18.7 dB, and the peak conversion efficiencies of the rectenna are 65.1% and 38.4% at 2.45 GHz and 5.8 GHz, respectively. The simulated and tested results are quite similar.

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“…With the rapid development of wireless technologies, RFEH has been receiving significant attention due to it has a wide range of applications, such as internet-ofthings (IoT) [1,2,3,4], wireless sensor networks (WSN) [5,6,7,8], wireless implanted medical devices [9,10,11,12], etc. Rectifier is a key component of the RFEH system and it can be employed to convert the RF power into DC power [13].…”

Section: Introductionmentioning

confidence: 99%

A novel high-efficiency class-F voltage doubler rectifier for RF energy harvesting

Liu,

Chen,

2024

IEICE Electron. Express

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In this letter, a high-efficiency 2.45 GHz class-F voltage doubler rectifier is proposed for radio frequency energy harvesting (RFEH). In the proposed topology, two harmonic termination circuits are employed to shape the current waveform to half sine wave and voltage waveform to square wave by yielding short termination at even harmonics and open termination at odd harmonics. Compared with previous class-F voltage doubler rectifiers, the proposed rectifier achieves a higher RF-DC power conversion efficiency (PCE). To validate the proposed approach, a 2.45 GHz voltage doubler rectifier has been designed and implemented. The measurement results show that the peak RF-DC PCE is 76% with a 15.6 dBm input power range. In addition, the measured PCE is higher than 50% over the input power range from 2 to 18 dBm.

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A Multiband Compact Flexible Energy Collector for Wearable or Portable IoT Devices

Cited by 13 publications

References 12 publications

A Novel Design of Broadband Circularly Polarized Rectenna With Enhanced Gain for Energy Harvesting

A Novel Design of Broadband Circularly Polarized Rectenna With Enhanced Gain for Energy Harvesting

A Compact Loop-shaped Dual-band Omnidirectional Rectenna for RF Energy Harvesting

A novel high-efficiency class-F voltage doubler rectifier for RF energy harvesting

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