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Powering wearable electronics with radio waves

05.04.2021

Man has learned to use radio waves not only to transmit information, take at least a microwave oven or Wi-Fi. An international team of researchers suggests using them to recharge wireless medical devices that measure a patient's vital signs. At the same time, devices will be able to produce energy continuously, regardless of the time of day and weather.

Modern power supplies for wearable medical electronics are not ideal. Solar cells, for example, need to be kept in direct sunlight. Triboelectric devices require constant movement. Another option was developed by a group of specialists led by Professor Larry Chen from the University of Pennsylvania.

Scientists have made a flexible broadband vibrator antenna capable of wirelessly transmitting data collected by medical sensors. The system consists of two metal antennas integrated on a conductive monatomic material graphene with a metal coating. The wideband design allows the distribution function to be maintained even when the device is pulled, twisted or bent.

Then the system was connected to an elastic rectifier, having received a rectenna capable of converting the energy of electromagnetic waves into electricity. The electricity can then be used to power wireless devices or charge batteries and supercapacitors.

The rectenna can pick up ambient radio waves and turn them into energy for devices that measure body temperature, hydration, or oxygen levels. Compared to other sources, its productivity is less, but the system can produce energy continuously.

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Mouse Gigabyte Aire M93 Ice 20.09.2014

Gigabyte has a new mouse M93 Ice, part of the Aire line.

As conceived by the company, the use of a new laser sensor with proprietary Ice technology allows you to work confidently on almost any surface, including glass, glossy and even ice. That is, the owner of the laptop will be able to use the mouse even in the most severe conditions. At the same time, it is stipulated that the recommended thickness of the glass surface is at least 4 mm and the presence of dust particles on it will improve the quality of positioning.

The sensitivity of the sensor is switched between 1200 and 2000 dpi by a dedicated button below the scroll wheel. The wheel is tiltable, on the left side of the mouse there are two programmable buttons.

The mouse is wireless and comes with an AA Ni-MH battery. Its capacity of 2100 mAh should be enough for three months of work, recharging is carried out through the micro-USB port, which has become the standard for modern mobile devices.

With dimensions of 113x71x42 mm, the weight of the Gigabyte Aire M93 Ice is 90 g, the operating range with line of sight is 10 m.

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