scholarly journals Characterization of Energy Availability in RF Energy Harvesting Networks

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Daniela Oliveira ◽  
Rodolfo Oliveira
Keyword(s):  
Energy Harvesting ◽  
Power Distribution ◽  
Energy Harvester ◽  
Base Stations ◽  
Rf Power ◽  
Rf Energy Harvesting ◽  
Gamma Distributions ◽  
Rf Signals ◽  
Spatially Distributed ◽  
Rf Energy

The multiple nodes forming a Radio Frequency (RF) Energy Harvesting Network (RF-EHN) have the capability of converting received electromagnetic RF signals in energy that can be used to power a network device (the energy harvester). Traditionally the RF signals are provided by high power transmitters (e.g., base stations) operating in the neighborhood of the harvesters. Admitting that the transmitters are spatially distributed according to a spatial Poisson process, we start by characterizing the distribution of the RF power received by an energy harvester node. Considering Gamma shadowing and Rayleigh fading, we show that the received RF power can be approximated by the sum of multiple Gamma distributions with different scale and shape parameters. Using the distribution of the received RF power, we derive the probability of a node having enough energy to transmit a packet after a given amount of charging time. The RF power distribution and the probability of a harvester having enough energy to transmit a packet are validated through simulation. The numerical results obtained with the proposed analysis are close to the ones obtained through simulation, which confirms the accuracy of the proposed analysis.

scholarly journals RF energy harvesting prototype operating on multiple frequency bands with advanced power management

2020 ◽  
Vol 17 (1) ◽  
pp. 70
Author(s):  
Manee Sangaran Diagarajan ◽  
Agileswari Ramasamy ◽  
Navaamsini Boopalan ◽  
Norashidah Bt. Md Din
Keyword(s):  
Energy Harvesting ◽  
Power Management ◽  
Rf Energy Harvesting ◽  
Frequency Bands ◽  
Dc Power ◽  
Start Up ◽  
Rf Signals ◽  
Nimh Battery ◽  
Rf Energy ◽  
Efficient Power

<span>Radio Frequency (RF) harvesting seems to be catching up as an alternate energy source whereby RF energy is scavenged from ambient sources and converted into renewable energy in terms of DC power. This converted DC power is then utilized to power up devices that require a low start up power in which eliminates the need for battery replacement. In this paper, a novel RF energy harvesting prototype is presented which consists of two microstrip patch antennas operating on GSM (900MHz) and WIFI (2.4GHz) &amp; WiMAX (2.3GHz) frequency bands with a bandwidth of 220MHz and 10.11MHz respectively to harvest RF signals from ambience. Two matching networks are presented as well to ensure efficient power transfer to load. Rectifiers are designed to transform the RF signals to DC power. The converted DC signals are then combined and fed to a power management circuit which charges a 4.2V NiMh battery and drives a load at a regulated output of 3V.</span>

scholarly journals RF Energy Harvesting System for Wireless Sensor Devices: A Review

2017 ◽  
Vol 5 (1) ◽  
pp. 1-5
Author(s):  
Bharat Mishra ◽  
Akhilesh Tiwari ◽  
Pankaj Agrawal
Keyword(s):  
Energy Harvesting ◽  
Energy Harvester ◽  
Wireless Sensor ◽  
Rf Power ◽  
Power Harvesting ◽  
Sensor Devices ◽  
Energy Harvesting System ◽  
Operating Lifetime ◽  
Rf Energy ◽  
Rf Energy Harvester

In present era several companies and research groups are developing enhanced technologies which help to increase the operating lifetime of battery used in wireless sensor devices. Energy harvesting from ambient radio frequency becomes an attractive and trendy solution for energizing the devices of wireless sensor networks. Abundant availability of RF power from number of cell phone towers, Wi-Fi networks and DTH transmitters ensure that ample amount of power may be harvested from ISM band and after RF to DC conversion used in various low power applications. In this paper a thorough review on existing techniques of various RF power harvesting circuit comprised of different RF to DC converter and matching network with their characteristics and applications is presented. The possibility of harvesting circuit is also explored. Authors also discussed various design issues for developing the RF energy harvester.

scholarly journals TRANSPARENT ENERGY HARVESTING ANTENNA FOR VEHICLE WINDSHIELD APPLICATION

SINERGI ◽  
2019 ◽  
Vol 23 (1) ◽  
pp. 27
Author(s):  
Yusnita Rahayu ◽  
Muhammad Ikmal ◽  
Ahmad Mudhirullaq Syam ◽  
Daniel Junianto
Keyword(s):  
Energy Storage ◽  
Energy Harvesting ◽  
Glass Substrate ◽  
Return Loss ◽  
Directional Pattern ◽  
Simulation Software ◽  
Rf Energy Harvesting ◽  
Rectifier Circuit ◽  
Rf Signals ◽  
Rf Energy

This paper presents a transparent energy harvesting antenna for a vehicle windshield application. The antenna is designed using AgHT-4 with a thickness of 0.175 mm and the glass substrate (Ɛr= 4.82) with a thickness of 2 mm. The antenna has dimensions of 46.238 x 35.4 mm. The antenna is designed and simulated in CST simulation software. It shows that the return loss of -32.76 dB obtained at 2.2412 GHz with broad directional pattern and a gain of 5 dBi. The rectifier circuit of RF energy harvesting will charge the energy storage by utilizing the ambient RF signals from the environment, convert it to the DC signal, and using the DC signal to charge the energy storage. This antenna is intended to be mounted on a car windshield to provide Wi-Fi signals to passengers

Enhancing RF-to-DC conversion efficiency of wideband RF energy harvesters using multi-tone optimization technique

2014 ◽  
Vol 8 (2) ◽  
pp. 143-153 ◽  
Author(s):  
Véronique Kuhn ◽  
Fabrice Seguin ◽  
Cyril Lahuec ◽  
Christian Person
Keyword(s):  
Energy Harvesting ◽  
Power Density ◽  
Conversion Efficiency ◽  
Impedance Matching ◽  
Optimization Technique ◽  
Base Station ◽  
Sensor Nodes ◽  
Base Stations ◽  
Rf Energy Harvesting ◽  
Rf Energy

In this paper, a 1.8–2.6 GHz wideband rectenna is designed for radio frequency (RF) energy harvesting in the context of wireless sensor nodes (WSN). To assess the feasibility of ambient RF energy harvesting, the power density from RF base stations is analyzed through statistical measurements. Power density measurements are also performed close to Wi-Fi routers. Using these results, a methodology based on impedance matching network adaptation and maximum power transfer is proposed to design the wideband RF harvester. Using this method, three RF bands,i.e.GSM1800, UMTS and WLAN, are covered. The theoretical analysis is confirmed by simulations and measurements. From measurements results, the prototype RF-to-DC conversion efficiency is 15% at −20 dBm from 1.8 to 2.6 GHz. It is shown that with three RF sources in the chosen bands, each emitting at 10 dBm, the RF-to-DC conversion efficiency is 15% better compared to that measured with a single RF source. Finally, 7 µW is harvested at 50 m from a GSM1800 and UMTS base station. This value confirms the RF harvester workability to supply small sensors.

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