High efficiency and scalable injection-locked oscillator array for wireless power transmission

Microwave power transmission has its unique advantages for its ability of supplying power to not-accessible and mobile receivers and is also called long-range wireless power transmission (WPT). The implementation of long-range WPT requires the phased array transmitter technology, in order to achieve the satisfactory transmission efficiency with high array gain and beam steering capability to mobile power receivers. The passive electronically scannable array (PESA) transmitter is a popular low cost solution for its shared RF signal and independent phase-shifting in analog domain. However, when it comes to the large-scale array beamforming, the cost of high resolution phase shifter and high efficiency power amplifier makes PESA prohibitively expensive if it is applied to WPT system in the market of civilian electronics.