Proceedings Article

# RF energy harvester for FM frequency band

01 Feb 2017-pp 1-4
Abstract: The central idea of this paper is to show the prospect of RF energy harvesting and converting the energy into DC, utilizing the reasonable power obtained, for low power device applications. The system harvests energy from various frequencies available in the spectrum band. The first part introduces some of the disadvantages of larger antenna height in KHz and higher path loss in GHz band of frequencies compared to MHz band of frequencies. Power used for the experiments is from FM band station of 90.8MHz. The second part of this paper is a voltage multiplier with a conversion ratio of four and the antenna used which is a wide band VHF antenna in order to cover frequency range from 80 to 110 MHz with a gain of 2.14dBi. Then a matching circuit to match the antenna impedance with the input impedance of the voltage multiplier is built in the third part of this paper. At the end, comparison of several power devices for load is made in this paper.

Topics: Antenna (radio) (62%), Frequency band (61%), Dipole antenna (61%) ...read more
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Open accessJournal Article
Abstract: A dual band inset fed microstrip patch antenna designed for 2.35 GHz and 3.7 GHz Wi-Fi band applications is presented. The designed antenna has a rectangular patch with inset feed which is mounted on a FR4 substrate. The patch dimension, positioning and dimensions of the feed are determined by standard formulae. The antenna proposed performs well both in Return loss and VSWR. Return loss of -23.23 dB and -21.16 dB, VSWR of 1.20 and 1.56 were achieved for 2.35GHz and 3.7 GHz respectively. Simulation based techniques of HFSS were used to optimize the results. The simplicity in the geometry of the designed receiver antenna is attractive for its use in Radio Frequency Energy harvesting(RFEH) System. Keywords—Dual band antenna, inset fed, RF Energy Harvesting, WiFi band, WiMAX band, HFSS.

1 Citations

Proceedings Article
01 Dec 2019-
Abstract: This paper presents multi-band and multi-location radio frequency (RF) survey for ambient energy harvesting As an alternative to costly spectrum analyzers, the survey was conducted using software defined radio for FM (88–108 MHz), cellular band (880 MHz) and Wi-Fi band (24 GHz) The power levels at three different locations in a tier-II smart city were recorded and plotted to get information on the available ambient RF power levels A full wave voltage quadrupler circuit (2-stage Dickson rectifier) was implemented to act as a rectifier and a voltage booster Two different types of antennae were used for capturing the ambient RF signals – wire antenna and capacitive loop antenna No impedance matching circuitry was employed and the ambient RF signals were used to charge up a capacitor connected to the rectifier output Capacitive loop antenna helped in achieving a peak capacitor voltage of 16 V and outperformed the simple wire antenna which provided a peak capacitor voltage of 13 V The charged capacitor was also used to drive an LED

Topics: RF power amplifier (59%), Loop antenna (59%), Radio frequency (59%) ...read more
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Journal Article
Abstract: The aim of this paper is to show the possibility to harvest RF energy to supply wireless sensor networks in an outdoor environment. In those conditions, the number of existing RF bands is unpredictable. The RF circuit has to harvest all the potential RF energy present and cannot be designed for a single RF tone. In this paper, the designed RF harvester adds powers coming from an unlimited number of sub-frequency bands. The harvester’s output voltage ratios increase with the number of RF bands. As an application example, a 4-RF band rectenna is designed. The system harvests energy from GSM900 (Global System for Mobile Communications), GSM1800, UMTS (Universal Mobile Telecommunications System) and WiFi bands simultaneously. RF-to-dc conversion efficiency is measured at 62% for a cumulative ${-}{\hbox{10}}$ -dBm input power homogeneously widespread over the four RF bands and reaches 84% at 5.8 dBm. The relative error between the measured dc output power with all four RF bands on and the ideal sum of each of the four RF bands power contribution is less than 3%. It is shown that the RF-to-dc conversion efficiency is more than doubled compared to that measured with a single RF source, thanks to the proposed rectifier architecture.

Topics: RF probe (62%), Radio frequency (56%), UMTS frequency bands (55%) ...read more

209 Citations

Open accessProceedings Article
01 Oct 2008-
Abstract: To assess the feasibility of ambient RF energy scavenging, a survey of expected power density levels distant from GSM-900 and GSM-1800 base stations has been conducted and power density measurements have been performed in a WLAN environment. It appears that for distances ranging from 25 m to 100 m from a GSM base station, power density levels ranging from 0.1 mW/m2 to 3.0 mW/m2 may be expected. First measurements in a WLAN environment indicate even lower power density values, making GSM and WLAN unlikely to produce enough ambient RF energy for wirelessly powering miniature sensors. A single GSM telephone however has proven to deliver enough energy for wirelessly powering small applications on moderate distances.

Topics: GSM (52%), Power density (52%)

182 Citations

Journal Article
Deepak Mishra1, Swades De1, Soumya Jana2, Stefano Basagni3  +2 moreInstitutions (4)
Abstract: RF energy harvesting (RFH) is emerging as a potential method for the proactive energy replenishment of next generation wireless networks. Unlike other harvesting techniques that depend on the environment, RFH can be predictable or on demand, and as such it is better suited for supporting quality-of-service-based applications. However, RFH efficiency is scarce due to low RF-to-DC conversion efficiency and receiver sensitivity. In this article, we identify the novel communication techniques that enable and enhance the usefulness of RFH. Backed by some experimental observations on RFH and the current state of the art, we discuss the challenges in the actual feasibility of RFH communications, new research directions, and the obstacles to their practical implementation.

166 Citations

Open accessJournal Article
Abstract: This paper presents an optimization of the voltage doubler stages in an energy conversion module for Radio Frequency (RF) energy harvesting system at 900 MHz band The function of the energy conversion module is to convert the (RF) signals into direct-current (DC) voltage at the given frequency band to power the low power devices/circuits The design is based on the Villard voltage doubler circuit A 7 stage Schottky diode voltage doubler circuit is designed, modeled, simulated, fabricated and tested in this work Multisim was used for the modeling and simulation work Simulation and measurement were carried out for various input power levels at the specified frequency band For an equivalent incident signal of –40 dBm, the circuit can produce 3mV across a 100 k? load The results also show that there is a multiplication factor of 22 at 0 dBm and produces DC output voltage of 50 V in measurement This voltage can be used to power low power sensors in sensor networks ultimately in place of batteries

Topics: Voltage doubler (69%), Voltage regulation (63%), Voltage optimisation (61%) ...read more

64 Citations

Proceedings Article
M. Bank1, M. Haridim1, S. Tapuchi1, J. Gavan1Institutions (1)
20 Oct 2011-
Abstract: The main problems concerned with the design of mobile headsets antennas treated in this paper are low efficiency and the difficulty of installing two antennas or more for Multiple Input-Multiple Output (MIMO) applications. This paper proposes a radical solution to the mentioned problems by avoiding the use of special antennas as radiating elements. The proposed efficient radiating element is the mobile headset printed circuit board. The proposed solution is compared with other classical solutions.

Topics: Headset (53%), Mobile telephony (52%), Dipole antenna (51%)

1 Citations

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