Assessment on the wireless power transfer figures of merit and transmitter architectures

This paper performs an assessment of available architectures and techniques for Wireless Power Transfer (WPT) transmitter blocks. In the transmitting segment of the WPT chain one of the driving components is the power amplification block, because it generally defines the capability of the system in terms of the range for the WPT link to be established, as well as, limiting or not the amount of information that can be exchanged. These facts are quite important because it is common to have WPT links that provide not only energy to the battery-less devices, but also allowing information to be exchanged between the WPT transmitter and several receivers. A practical example of a power amplifier to be integrated in a WPT transmitter for the 5.8GHz band is presented, along with some conclusions on the topic.