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Acquiring Wi-Fi Energy to Charge a Mobile Phone.
As a result, outdoor travelers, tourists and businessman who utilize portable electronic devices often experience battery depletion of their devices without the means of charging their device. The number of Wi- Fi access point continues to increase. There are many occasions where it is desirable to acquire energy from many radio frequency stations, while charging any electronics device through RF-DC circuit with high efficiency, for example, Wi-Fi hotspot access points. We focus on ambient radio frequency signals and power available in the ambient. This research explain, how can we charge portable devices without electrical source but means of propagating signal generated by Wireless-Fidelity (Wi-Fi) router. The research will show all the activities addressed to design a system to recover energy from electromagnetic sources presents around us like Wi-Fi routers. An energy acquiring circuit includes one loop antenna to detect RF signals and electronic board for converting RF energy to DC current. We can use to charge the battery of our portable devices by acquiring the electromagnetic energy around us.
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Recently, wireless telecommunication bears dramatic progress. There is a growing number of radio stations in the urban environment such as GSM mobile base stations, satellite, digital and digital TV towers, WiMax, and WiFi routers [1]. Various bands are available for WiMAX technology stage in different parts of the world. The frequencies commonly used are 3.5 and 5.8GHz for IEEE 802.16d and 2.3, 2.5 and 3.5 GHz for IEEE 802.16e [2]. There are many places in our areas where applications on telecommunication media that involve WiMax bands with two band frequencies are made ((f01= 2.4GHz) and (f02= 3.84 GHz)) [3]. Because of the attractive features of the Dual-band slot-loaded pin fed linear-polarized rectangular patch antenna, such as planar profile, ruggedness, and low cost, there has been considerable interest in the development of these antennas to recycle energy microwave available mainly in an urban zone, as shown in figure 1. It is sometimes possible that a broadband rectangular microstrip antenna can cover the frequencies of interest [4]. Yet, the advantage of using a Dual-band slot-loaded pin-fed linear-polarized rectangular patch antenna is that it receives two operating frequencies [5]. We can collect and recycle more microwave energy into our electronic harvesting PCB circuit. On the other hand, the advantage of the dual-frequency antenna is that it focuses on the frequencies of interest and is thus more directive [6] [7]. This paper is part of a radiofrequency ampler project that aims to construct a prototype of a WiMax harvesting energy system. Accordingly, we show the initial results of our present research. In the future, we will propose new methods to improve our initial results, and we will continue to analyze and make new PCB boards.
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