Exploitation of a dual-band cell phone antenna for near-field WPT

Abstract

The same antenna, designed to exploit its far-field properties for communication purposes, can be suitably configured for simultaneously realizing wireless power transfer via its near-field properties. In this paper we analyze the near-field behavior of a pair of closely coupled transmitting and receiving dual-band printed monopole antennas, suitable for cell phones applications. The proposed architecture is based-on a frequency division approach, operating in the GSM900 and GSM1800 bands for data communications, and in the ISM 433 MHz for near-field power transfer. In this work we develop the theoretical and numerical demonstration of how it is possible to achieve both far-field performance and near-field power transfer efficiency (from 35% to 10%) for mobile phones located few centimeters apart.