To use electric power, it is normal to think of electrical cables. Otherwise, battery packs are needed to supply power to devices such as smartphones and electric cars. But Raytheon was awarded a contract by the US Army a few weeks ago to develop a wireless power transmission system.
This technology consists of a transmitter that sends microwaves to a receiver. It is then converted into electrical power. With this, electronic devices can be used without long wires or heavy battery packs. The American army needs this wireless power technology to facilitate operations in the field. Energy logistics needs can be changed to wireless systems. Meanwhile, for infantry soldiers, they no longer need to carry increasingly heavy battery packs due to increasing energy needs.
Raytheon has been producing this technology since the 1960s with 475 W of power that can be transmitted up to a distance of 1.6 kilometers. The problem is the low power transfer efficiency of only around 54%.