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Human body for wireless communication

10.09.2015

Due to the wide spread of various electronic devices, our body, whether we like it or not, becomes the carrier of a large number of gadgets that must somehow communicate with each other. And we are talking not only about smartphones or smartwatches, but also remotely controlled medical devices that are literally inside the body.

Communication now takes place via a wireless connection such as Bluetooth, which uses transmitters powerful enough to penetrate the human body and, as a result, rather bulky batteries. Patrick Mercier, a professor in the Department of Electrical and Computer Engineering at the University of California at San Diego, tried to solve the problem. Together with his graduate students, he developed a communication system that creates ultra-weak electromagnetic fields and transmits an electrical signal directly through the body with minimal loss.

The system is at a very early stage of development. However, its authors already claim that it significantly outperforms existing RF technologies, reducing fading loss by an incredible 10 million times compared to Bluetooth technology. According to Mercier, the technology he developed provides the lowest loss of all currently known wireless communication systems involving the human body.

To build the prototype, the engineers used copper wire encased in a PVC tube. At one end of the device there is a receiver and an analyzer, at the other end the wires wrap around various parts of the body - the head, arms and legs. Thanks to such a coil, an induction current arises, and the limbs act as a kind of waveguides. Using this system, the authors were able to transmit ultra-weak signals from hand to hand, from hand to head and from hand to foot, receive them and analyze them.

If the technology can be brought to an industrial design, its advantages will be manifested not only in reducing the size of devices by minimizing energy sources, but also in increasing the security of communications. Unlike Bluetooth technology, which transmits a signal through an open and accessible space, almost the entire magnetic field remains inside the body, and external radiation is so negligible that it will be possible to intercept a signal.

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