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.

RF energy harvester for FM frequency band

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.

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M. Haridim

Papers

A new effective antenna for mobile headsets