A high-efficiency dual-frequency rectenna for 2.45- and 5.8-GHz wireless power transmission

Suh, Young-Joo; Chang, Kai

doi:10.1109/tmtt.2002.800430

Cited by 336 publications

(25 citation statements)

References 14 publications

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“…For a monochromatic RF source, there is no thermodynamic or quantum limit to the RF to DC conversion efficiency, other than the resistive losses and threshold voltages for a semiconductor process. For rectification, when the input voltage to the rectifier is much higher than a semiconductor process threshold, conversion efficiencies of 85% have been achieved (Sun and Chang, 2002). At low input voltages relative to the semiconductor process threshold, efficiencies as high as 25% and 2 μW load have been achieved [see (Mandal and Sarpeshkar, 2007) for an analysis of power efficiency].…”

Section: Evaluation Of Modalitiesmentioning

confidence: 99%

Physical principles for scalable neural recording

Marblestone

Zamft

Maguire

et al. 2013

Front. Comput. Neurosci.

225

223

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Simultaneously measuring the activities of all neurons in a mammalian brain at millisecond resolution is a challenge beyond the limits of existing techniques in neuroscience. Entirely new approaches may be required, motivating an analysis of the fundamental physical constraints on the problem. We outline the physical principles governing brain activity mapping using optical, electrical, magnetic resonance, and molecular modalities of neural recording. Focusing on the mouse brain, we analyze the scalability of each method, concentrating on the limitations imposed by spatiotemporal resolution, energy dissipation, and volume displacement. Based on this analysis, all existing approaches require orders of magnitude improvement in key parameters. Electrical recording is limited by the low multiplexing capacity of electrodes and their lack of intrinsic spatial resolution, optical methods are constrained by the scattering of visible light in brain tissue, magnetic resonance is hindered by the diffusion and relaxation timescales of water protons, and the implementation of molecular recording is complicated by the stochastic kinetics of enzymes. Understanding the physical limits of brain activity mapping may provide insight into opportunities for novel solutions. For example, unconventional methods for delivering electrodes may enable unprecedented numbers of recording sites, embedded optical devices could allow optical detectors to be placed within a few scattering lengths of the measured neurons, and new classes of molecularly engineered sensors might obviate cumbersome hardware architectures. We also study the physics of powering and communicating with microscale devices embedded in brain tissue and find that, while radio-frequency electromagnetic data transmission suffers from a severe power–bandwidth tradeoff, communication via infrared light or ultrasound may allow high data rates due to the possibility of spatial multiplexing. The use of embedded local recording and wireless data transmission would only be viable, however, given major improvements to the power efficiency of microelectronic devices.

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Section: Evaluation Of Modalitiesmentioning

confidence: 99%

Physical principles for scalable neural recording

Marblestone

Zamft

Maguire

et al. 2013

Front. Comput. Neurosci.

225

223

View full text Add to dashboard Cite

show abstract

“…Wireless sensors need continuous power, which, with the conventional methods, suffer from the short lifetime of the batteries. In addition, an energy harvester (EH) and low-power devices may not be installed under normal conditions, and their batteries cannot be changed easily [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…Due to problems associated with the replacement or recharging of batteries, self-powering based on an energy harvesting communication network is a critical demand for these wireless devices. The main focus of recent work is remote charging via an EH from a renewable source and optimizing the processing methods [1][2][3][4][5][6][7][8]. Besides thermal, solar, and wind energy sources for EH, recently, the presence of ambient radio frequency (RF) signals is becoming an appealing source for EH in portable devices.…”

Section: Introductionmentioning

confidence: 99%

A High-Efficiency and Wide-Input Range RF Energy Harvester Using Multiple Rectenna and Adaptive Matching

et al. 2020

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In this paper, a Radio Frequency (RF) energy harvester (EH) system for Internet of Things (IoT)-related applications is presented. The proposed EH architecture operates at 5.2 GHz band and utilizes multiple rectenna. This approach enhances the efficiency of the whole system over a wide dynamic RF input range. In the presented circuit, configuration of the rectenna is controlled by Field-Programmable Gate Array (FPGA) with respect to the input power level of the received RF input signal. In addition, an automatic adaptive matching based on the configuration of the rectenna, level of the received signal, and load current adjusts the matching network. The rectenna is realized through the Radio Frequency-Direct Current (RF-DC) converter composed of two Schottky diodes and generates the output DC voltage. Finally, a buck-boost converter provides the flattened and fixed voltage for the IoT and wearable devices. The 5.2 GHz band reconfigurable system demonstrates 67% high efficiency and 6.1 V output DC voltage where the power level of RF input is +20 dBm. The main application of the proposed structure is for charging wearable smart devices such as a smart watch and bracelet.

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“…Afterwards JPL and Raytheon are found to be the first company to design and use the rectenna in 1998 . Efficiency of the rectenna depends upon the input power received by the antenna and conversion of this RF signal into output voltage generated on the load resistance by the rectifier and DC pass filter . Dependence of the efficiency of rectifier and DC pass filter (output voltage) on antenna (input power) makes the antenna core and key component of a rectenna.…”

Section: Introductionmentioning

confidence: 99%

“…7 Efficiency of the rectenna depends upon the input power received by the antenna and conversion of this RF signal into output voltage generated on the load resistance by the rectifier and DC pass filter. 8 Dependence of the efficiency of rectifier and DC pass filter (output voltage) on antenna (input power) makes the antenna core and key component of a rectenna. Having an eye on the importance and role of antenna in rectenna and requirement of compact electronic devices in modern wireless world, designing of an efficient antenna with lessen size is an endeavor for the researchers in recent years.…”

Section: Introductionmentioning

confidence: 99%

Design of a miniaturized frequency reconfigurable antenna for rectenna in WiMAX and ISM frequency bands

Naqvi

Khan

2018

Micro & Optical Tech Letters

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A frequency reconfigurable miniaturized circular microstrip patch antenna operating in WiMAX (2.5–2.8 GHz) and ISM (2.4–2.48 GHz) frequency bands for the rectenna applications is proposed here. The theory of reconfigurability is employed to switch the operating frequency of the proposed antenna from 2.53 to 2.45 GHz. The electrical length of the radiated circular patch is increased while keeping the overall physical dimension of the antenna constant to provide different current distributions on the radiating patch for the phenomenon of frequency shift. The high permittivity substrate and microstrip transmission‐line feeding mechanism is used to reduce the size of antenna. To demonstrate the reduction in antenna size, a comparison of the proposed antenna with the latest antennas for rectenna applications in literature is presented.

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A high-efficiency dual-frequency rectenna for 2.45- and 5.8-GHz wireless power transmission

Cited by 336 publications

References 14 publications

Physical principles for scalable neural recording

Physical principles for scalable neural recording

A High-Efficiency and Wide-Input Range RF Energy Harvester Using Multiple Rectenna and Adaptive Matching

Design of a miniaturized frequency reconfigurable antenna for rectenna in WiMAX and ISM frequency bands

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