For decades, going underground meant losing your signal and your lifeline. Korean researchers at ETRI (Electronics and Telecommunications Research Institute) have changed the paradigm with a breakthrough that sounds simple but is genuinely remarkable.
The technology allows for voice communication 100 meters underground, wirelessly. This is the world’s first, and it matters more than you might think.
How does it work?
The communication uses magnetic field underground communication source technology, and is the world’s first successful attempt at it. Instead of relying on conventional radio waves, which get absorbed almost instantly by rock and soil, ETRI’s system uses low-frequency magnetic fields.
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The setup includes a 1-meter-diameter transmitting antenna on the surface and a small, handheld-sized receiving sensor underground operating at around 15 kHz. That’s enough bandwidth to support a data rate of 2 to 4 kbps, which is sufficient for clear, two-way voice communication.
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