The NRL managed to transmit 1.6 kW of electricity per 1 km using microwaves

Wireless power transmission is something that has been tested for more than a century. We already use wireless charging for phones using induction, but there are other ways. The US Naval Research Laboratory (NRL) used microwaves with a frequency of about 10 GHz, which proved to be a good compromise between several required properties. Antennas from the project SCOPE-M (Safe and Continuous Power bEaming – Microwave) are dotted with RF diodes that convert these waves to direct current, achieving 73% conversion efficiency. So the losses are not small, on the other hand it is already something that can be used in some cases.

The test took place at the Army Research Complex in Blossom Point, Maryland, where it was able to transmit up to 1,649 kW over a distance of 1,046 meters (transmitted power was 2,265 kW). The transmitter had a diameter of 5.4 meters, the receiving antenna had an area of ​​4 meters2. The second experiment with horizontal polarization then yielded values ​​of 1.581 kW with a transmitted power of 2.229 kW and an efficiency of 71%. A similar successful test was also conducted with the help of Haystack Ultrawideband Satellite Imaging Radar (HUSIR) at MIT.

The selected frequency around 10 GHz (9.7 GHz in the first case, 10.5 GHz in the second) should bring an advantage, for example, in low sensitivity to bad weather, and even in heavy rain, the loss should not exceed 5% compared to the ideal case. It is also intended to be a safe technology that does not require measures such as a laser. According to scientists, it should be safer, for example, for birds, but also other animals and humans.

The basic idea of ​​this project is to use it in the military, but there is also talk of a more distant future and the possibility of producing electricity in space (permanently without weather fluctuations, 365/24/7) and sending it wirelessly to Earth at frequencies where the weather does not play such a big role. in contrast to how it significantly affects the performance of solar and wind power plants in the terrestrial environment. This is far from a new idea, it has appeared in the press several times and Elon Musk, for example, has talked about it as a teenager. Moreover, the United States is not the only country working on something similar. The UK’s Space Energy Initiative (SEI) would like to have the first such solar power plant in space in 2035 and produce 30 GW of electricity in the mid-1940s. For example, Airbus and several universities are collaborating on this project.

Source: Svět hardware by

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