Date Added: Mar 2013
Over the last decade, there has been a lot of interest to transfer energy wirelessly and recently, Radio Frequency (RF) radiation has become a viable source for energy harvesting. It is nowadays possible to transfer the energy wirelessly with a reasonable efficiency over small distances and, furthermore, the Wireless Sensor Network (WSN) in which the sensors are capable of harvesting RF energy to power their own transmissions has been introduced in industry. Until now, wireless energy transfer has been developed independently from the wireless information transfer. Interestingly, because RF signals carry information as well as energy, "Joint wireless information and energy transfer" has attracted attention very recently.