Theoretical Analysis of RF-DC Conversion Efficiency for Class-F Rectifiers

Guo, Jia; Zhang, Hongxian; Zhu, Xinen

doi:10.1109/tmtt.2014.2298368

Cited by 178 publications

(102 citation statements)

References 5 publications

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“…In fact, there are many state-of-theart techniques that can achieve a nearly constant conversion efficiency within a range of received power level [27]. Thus, the linear model can be used for the non-linear case by choosing a specific received power range wherein the conversion efficiency remains nearly stable.…”

Section: /2mentioning

confidence: 99%

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Online Power and Time Allocation in MIMO Uplink Transmissions Powered by RF Wireless Energy Transfer

Liang

Zhao

Yang

et al. 2017

IEEE Trans. Veh. Technol.

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Abstract-Wireless energy transfer (WET) has been a promising technology to tackle the lifetime bottlenecks of energy-limited wireless devices in recent years. In this paper, we study a WET enabled multiple input multiple output (MIMO) system including a base station (BS) and a user equipment (UE), which has a finite battery capacity. We consider slotted transmissions, where each slot includes two phases, namely downlink (DL) WET phase and uplink (UL) wireless information transmission (WIT) phase. In the WET phase (a fraction τ of a slot), the BS transfers energy and the UE stores the received energy in the battery. In the WIT phase (a fraction 1 − τ of a slot), the UE transmits information to the BS by using the energy in the battery. Considering the power sensitivity α of the radio frequency (RF) to direct current (DC) conversion circuits, the BS transfers energy only if the UE received power is larger than α, and the downlink WET is formulated as a Bernoulli process. Based on the formulation, we propose an online power and time allocation algorithm to maximize the average data rate of uplink WIT. We also extend the proposed algorithm to multiple user systems. The numerical results show that the proposed algorithm outperforms the existing schemes in terms of average data rate, energy efficiency and outage probability.Index Terms-WET, MIMO, online power and time allocation, finite battery size.

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Section: /2mentioning

confidence: 99%

“…We can observe from (27), (28) and (29) that the water level is constant for different antennas in the same slot, because (29) is not related to j, the antenna element index. Thus, the power allocation for different antennas can be obtained by traditional water filling algorithms.…”

Section: B Ul Information Transmission Phasementioning

confidence: 99%

Online Power and Time Allocation in MIMO Uplink Transmissions Powered by RF Wireless Energy Transfer

Liang

Zhao

Yang

et al. 2017

IEEE Trans. Veh. Technol.

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“…First is the source of the nonlinear property of the diode which was analyzed by Guo et al [5], who found that, from the nonlinear junction resistance R j and the nonlinear parasitic junction capacitance C j , the nonlinear junction resistance and capacitance could be expressed by the following equations: (1)…”

Section: Principal Design Of the Rf-dc Convertermentioning

confidence: 99%

A Novel Design of an RF-DC Converter for a Low–Input Power Receiver

Seo

2017

J Electromagn Eng Sci

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Microwave wireless power transmission (MWPT) is a promising technique for low and medium power applications such as wireless charging for sensor network or for biomedical chips in case with long ranges or in dispersive media such. A key factor of the MWPT technique is its efficiency, which includes the wireless power transmission efficiency and the radio frequency (RF) to direct current (DC) voltage efficiency of RF-DC converter (which transforms RF energy to DC supply voltage). The main problem in designing an RF-DC converter is the nonlinear characteristic of Schottky diodes; this characteristic causes low efficiency, higher harmonics frequency and a change in the input impedance value when the RF input power changes. In this paper, rather than using harmonic termination techniques of class E or class F power amplifiers, which are usually used to improve the efficiency of RF-DC converters, we propose a new method called "optimal input impedance" to enhance the performance of our design. The results of simulations and measurements are presented in this paper along with a discussion of our design concerning its practical applications. This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. ⓒ

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“…At higher frequencies, parasitic reactance further degrades conversion efficiency [4]. At low power levels (<-20 dBm) and high frequencies, the diode's parasitics can greatly hinder a rectenna's ability to operate of any rectifier design [12].…”

Section: A Antenna Matching and Rf-to-dc Improvementsmentioning

confidence: 99%

Parametric analysis and design guidelines of RF-to-DC Dickson charge pumps for RFID energy harvesting

Marshall

Morys

Durgin

2015

2015 IEEE International Conference on RFID (RFID)

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This paper presents the effects of design parameters on output efficiency and input impedance of RF-to-DC Dickson charge pumps by varying input parameters in simulation. Diode parasitics and input impedance mismatch between the charge pump and antenna are found to significantly decrease the effectiveness of charge pumps, while stage capacitance size appears to have little effect on efficiency. Off-the-shelf diodes are also compared through simulation to find which diodes perform best at each ISM frequency band and various power levels. The investigation is summarized by guidelines to assist designers in developing efficient RF-to-DC Dickson charge pumps as well as concluding with a design methodology.

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Theoretical Analysis of RF-DC Conversion Efficiency for Class-F Rectifiers

Cited by 178 publications

References 5 publications

Online Power and Time Allocation in MIMO Uplink Transmissions Powered by RF Wireless Energy Transfer

Online Power and Time Allocation in MIMO Uplink Transmissions Powered by RF Wireless Energy Transfer

A Novel Design of an RF-DC Converter for a Low–Input Power Receiver

Parametric analysis and design guidelines of RF-to-DC Dickson charge pumps for RFID energy harvesting

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