Wireless electricity, a dream soon to come true ?

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Radio, mobile networks, WiFi, Bluetooth… they are invisible but constitute a windfall of energy from which small electronic devices could passively draw their electrical power – without requiring recharging or batteries. Thus, researchers from the National University of Singapore (NUS) in partnership with Japanese and Italian counterparts have succeeded in taking a major step towards realizing this dream.< /p>

Their new rectifier has indeed managed to draw direct current from these ambient signals. Enough to imagine a number of small connected objects that would indefinitely do without recharging and could still perform ultra-useful tasks: displaying prices or information, collecting data such as temperature, wireless switches, etc.

What if IoTs drew their energy from ambient radio waves?

De facto, the technology of connected objects is developing very quickly, but this growth is limited by the question of energy. In many cases, the specifications imply permanent operation of a large number of units that cannot be easily recharged when necessary. Using their rectifier, the researchers demonstrated a commercially available temperature sensor, powered entirely wirelessly by their new rectifier.

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All this without a transmitting station, simply by drawing energy from ambient signals. The key to their success is a technology based on “nanoscale spins”. While these terms may seem rather abstruse from a distance, the need for innovation is actually easy to understand. Indeed, particularly in urban areas, we are constantly traversed by a few mW of energy in the form of radio waves at various frequencies, sometimes intermittent.

The signal is irregular and weak: these waves are intended to transmit data. However, to transform these waves into electricity, a key element is needed: a rectifier. Unfortunately, the available components operate erratically in these applications. This is what the famous nanoscale spin rectifier technology changes, because they are more sensitive and stable at these energy levels.

For now, researchers want to go even further and propose an element that integrates everything needed to deliver low levels of direct current energy to small connected objects. Including directly integrating the antenna and the rectifier on the same chip. Once the demonstration stage is over, they hope to popularize this technology in the coming years. An alternative to the algae developed by another team for the same purpose.

• Will batteries and accumulators soon be a thing of the past in small connected devices?? This is what researchers claim, announcing a major discovery in this regard.
• A new technology of so-called nanoscale spin rectifiers would make it possible to capture relatively low levels of energy completely passively, regardless of location.
• Enough to develop IoT but also reduce the energy waste of data transmission by radio signals.

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