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Found a reliable way to transfer energy without wires

27.04.2022

A team of scientists from the US Naval Research Laboratory has tested a new technology for wireless power transmission.

Using microwave radiation, physicists managed to transmit electricity with a power of 1,6 kilowatts over a distance of 1 kilometer at the US Army research site in Blossom Point (Maryland). The Laboratory emphasizes that this is the most successful and reliable demonstration of wireless power transmission in the last 50 years.

Energy beams are transmitted between two points within the Safe and Continuous Power bEaming - Microwave (SCOPE-M) system. Special equipment converts electricity into microwaves, which are then focused by a narrow beam on a receiver with the so-called rectennas (rectifying antenna - rectifying antenna) - this is a special type of receiving antenna with high-frequency diodes. When microwaves hit the rectenna, they are converted into direct current.

For 12 months, American scientists have tried using SCOPE-M to transmit electricity in the form of a microwave beam with a frequency of 10 GHz in two places - at the Blossom Point test site, as well as at the Haystack ultra-wideband satellite imaging radar transmitter at the Massachusetts Institute of Technology (MIT). The result in Maryland was 60% higher peak power, but Massachusetts was above average, resulting in more power in the end.

Scientists do not want to use a higher microwave frequency, because this will lead to energy loss when passing through the atmosphere. The 10 GHz frequency allows the use of cheap and reliable components, while the power loss is less than 5% even in heavy rain.

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