用周边专用的微波发射器给一些安装在建筑物或工业机器上的无线传感器等小型电子设备供电已经成为可能。
It is already possible to power small electronic devices, such as wireless sensors installed in buildings and industrial machinery, using a dedicated microwave transmitter nearby.
20世纪60年代无线传输概念再次被提出，当时展出的一种微型直升机，通过地面发出的微波光束来供电。
Wireless transmission emerged again in the 1960s, with a demonstration of a miniature helicopter powered using microwaves beamed from the ground.
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