Through-The-Earth technology is already being tested on smartphones. According to information circulated by IEEE Xplore.the technology has been in development since 2023.
Bypassing the limitations of the previous version
The new method utilizes magnetic induction to provide clear communication with devices located underground. Magnetic induction avoids the attenuation and signal degradation that occurs with traditional RF methods.
The tests, which lasted from 2023, were conducted on a small 0.9×0.9 square meter transmitting loop antenna and a small magnetic field pickup sensor. They were connected to a wireless communication system using quadrature phase-shift manipulation to transmit data at 2 kbps. The tests took place in a limestone environment known for its ability to effectively block radio signals.
To successfully complete the tests, the researchers needed to bypass the limitations of the previous version of the technology, which prevented the signal from traveling deep underground. For this purpose, a method of transmitting wireless signals using magnetic induction and electric current at low radio frequencies was developed. At first it was possible to achieve a signal range of up to 40 meters underground. The use of magnetic induction made it possible to increase the range to 100 meters.
Smartphones are next
Communication devices that support Through-The-Earth technology are on the market, but they do not use magnetic fields. These devices rely on extremely high radio transmission power to achieve the necessary range. ETRI is working to integrate the innovative technology into compact devices such as smartphones and tablets. Communication technology that uses magnetic fields to transmit a signal deep underground has the potential to be integrated into smaller devices with lower power and a wider range of applications.
The technology developed in South Korea will allow emergency services to communicate with people lost or trapped underground. It is also being considered for use in national defense and offshore drilling.
