Our phones emit large amounts of energy in the form of RF signals like WiFi, 4G, 3G and Bluetooth. When a phone is transmitting, only a small fraction of the phone’s signal actually reaches the receiver (Cell tower, WiFi router), while the majority of the signal is wasted to the air.
Panasonic PhotoMOS® Photovoltaic MOSFET High-Power Drivers
Adam-Tech Wire-to-Board Solutions