A revised methodology to analyze the rectenna power conversion efficiency based on antenna/rectifier interface losses

Cambero, Eduardo Vicente Valdés; Paz, Humberto Pereira da; Silva, Vinicius Santana da; Consonni, Denise; Capovilla, C. E.; Casella, Ivan R. S.

doi:10.1016/j.aeue.2021.153686

Cited by 3 publications

(2 citation statements)

References 23 publications

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“…A typical EM harvesting system consists of an antenna, a matching circuitry and a rectifier [35], Figure 2a. In the literature, this kind of a system is called a rectenna [36].…”

Section: Concept Of the Sensor Operationmentioning

confidence: 99%

“…EM harvesting can be utilized as a power source in applications with very low power demands [5,[34][35][36][37][38][39]. For the first time, it is shown in this work that it is possible to harvest EM energy by using the human body as an antenna and to modulate the obtained voltage by using a humidity sensor with activated aluminum electrodes in order to detect human breathing.…”

Section: Introductionmentioning

confidence: 96%

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Self-Powered Wearable Breath-Monitoring Sensor Enabled by Electromagnetic Harvesting Based on Nano-Structured Electrochemically Active Aluminum

et al. 2023

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Self-powered sensors are gaining a lot of attention in recent years due to their possible application in the Internet of Things, medical implants and wireless and wearable devices. Human breath detection has applications in diagnostics, medical therapy and metabolism monitoring. One possible approach for breath monitoring is detecting the humidity in exhaled air. Here, we present an extremely sensitive, self-powered sensor for breath humidity monitoring. As a power source, the sensor uses electromagnetic energy harvested from the environment. Even electromagnetic energy harvested from the human body is enough for the operation of this sensor. The signal obtained using the human body as a source was up to 100 mV with an estimated power of 1 nW. The relatively low amount of energy that could be harvested in this way was producing a signal that was modulated by an interdigitated capacitor made out of electrochemically activated aluminum. The signal obtained in this way was rectified by a set of Schottky diodes and measured by a voltmeter. The sensor was capable of following a variety of different respiration patterns during normal breathing, exercise and rest, at the same time powered only by electromagnetic energy harvested from the human body. Everything happened in the normal environment used for everyday work and life, without any additional sources, and at a safe level of electromagnetic radiation.

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“…A typical EM harvesting system consists of an antenna, a matching circuitry and a rectifier [35], Figure 2a. In the literature, this kind of a system is called a rectenna [36].…”

Section: Concept Of the Sensor Operationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Self-Powered Wearable Breath-Monitoring Sensor Enabled by Electromagnetic Harvesting Based on Nano-Structured Electrochemically Active Aluminum

et al. 2023

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Temperature Analysis of Schottky Diodes Rectifiers for Low-Power RF Energy Harvesting Applications

et al. 2023

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This article aims to contribute for the improvement of low-power Radio Frequency Energy Harvesting (RFEH) designs based on Schottky Barrier Diode (SBD) rectifiers, presenting a study of the relationship between RF-DC Power Conversion Efficiency (PCE) and circuit temperature, which is directly related to the non-linear behavior of the metal-semiconductor junction of SBDs. For this purpose, SPICE diode models were revisited, evaluating the temperature dependence and its effects on forward and reverse conduction modes. The SBDs SMS7621 and SMS7630 temperature dependent characteristics are evaluated according the proposal, and their use is explored through analytical modeling and simulation analyzes of an RFEH system for temperatures ranging from 240 to 360 K. Hence, after an initial formulation of the optimum operation in terms of PCE, two series RF rectifiers are designed based on the mentioned diodes, aiming at an efficient operation over different temperature ranges according to each component optimum PCE, at 300 K for the SMS7630 and over 340 K for the SMS7621. For the SMS7630 prototype, the maximum measured PCE is 25.33% around 293 K, but decreases to 3.65% around 353 K, and for the SMS7621 the measured PCE goes from 11.56% to 16.34% in the same temperature range, considering -20 dBm as Input Power (P in ) due to the low-power RFEH premise. The results leads to a higher PCE stability for the SMS7621 through the whole analyzed range, despite the overall PCE that is limited by the matching network losses intrinsic to the design.INDEX TERMS Energy harvesting, radio frequency, rectifier, schottky diodes, temperature.

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Modeling Schottky Diode Rectifiers Considering the Reverse Conduction for RF Wireless Power Transfer

Trevisoli

Paz

Silva

et al. 2022

IEEE Trans. Circuits Syst. II

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A revised methodology to analyze the rectenna power conversion efficiency based on antenna/rectifier interface losses

Cited by 3 publications

References 23 publications

Self-Powered Wearable Breath-Monitoring Sensor Enabled by Electromagnetic Harvesting Based on Nano-Structured Electrochemically Active Aluminum

Self-Powered Wearable Breath-Monitoring Sensor Enabled by Electromagnetic Harvesting Based on Nano-Structured Electrochemically Active Aluminum

Temperature Analysis of Schottky Diodes Rectifiers for Low-Power RF Energy Harvesting Applications

Modeling Schottky Diode Rectifiers Considering the Reverse Conduction for RF Wireless Power Transfer

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