Energy is one of the pressing issuses nearly all around the world. How it can be possible that antennas can be used to harvest solar energy?
Hello. Firstly it is necessary to know for which frequency you would like to use for this wireless power transmission. After, How much power you would like to transfer? Then, what kind of antenna you would use for it and its efficiency. Finally, with all these information required you would see if it is possible to use antennas for wireless power transmission.
Best Regards,
Antennas can be used to harvest ambient RF energy that can be utilized to power up small integrated devices which require less power. This has been proved earlier. An ECE professor at GTech invented small printable antennas which harvested RF energy at a wide band of spectrum. Such small printable antennas when realized in the form of grid etched in small devices can charge up batteries...
The idea of wireless power transmission dates back to Nikola Tesla's, the electro-wizard, famous experiment...There is very recent wireless power transfer project under consideration by Japan government which aims to deploy farms of solar panels in space. This project will exploit the unending solar energy and beam-back it to earth...Such projects can be very strong alternative form of renewable energy to the more disastrous nuclear energy...
There have some applications in market. But the efficiency not only of electrical conversion but also overall efficiency at system levels needs improved.
Dear all, if you are interested in Wireless Power Transmission I suggest you to read the following interesting paper published by my collegues in the Proceedings of the IEEE:
A. Massa, G. Oliveri, F. Viani, and P. Rocca, "Array Designs for Long-Distance Wireless Power Transmission: State-of-the-Art and Innovative Solutions," Proceedings of the IEEE, vol. 101, no. 6, pp. 1464-1481, June 2012.
To send the energy from space to Earth highly directive antennas should be used, otherwise the received energy is very small, But directive antennas must be aligned precisely to have higher amount of received power.
Few years ago, we did a project for WPT demonstration. May be you can get some idea from that.
Article:
M. I. Abbasi, S. A. Adnan, M. Amin, and F. Kamran, “Wireless power transfer using microwaves at 2.45 GHz ISM band,” in Proc. IEEE Int. Bhurban Conf. Applied Sci. Tech., Islamabad, Pakistan, Jan. 2009, pp. 99 - 102.
Abstract:
We have demonstrated wireless power transfer by coupling RF power from a microwave oven magnetron RF source using a dipole at optimum position within the cavity. A 40dBm coupled power is transmitted using a monopole corner reflector antenna having gain of 14.97dBi and a half power beam width of 22 : At the receiving end a patch antenna is placed at variable distances ranging from 0.307 meters (1 foot) to 4 meters (13 feet). The measured power received varies from 25dBm to 3dBm which is in close agreement with the theoretically calculated value using Friis transmission equation. The received RF power is simulated on Multisim with a rectifier circuit and it is shown that an efficiency of 5.5% to 0.2% with respect to the transmitted power can be achieved as the distance is varied from 0.307 meters to 4 meters.
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