Researchers at Universiti Teknologi MARA in Malaysia have achieved in using ionised gas in a everyday fluorescent light tube as an antenna for a Wi-Fi Internet router.
Wi-Fi routers are originally two-way radios that connect digital devices to the Internet, But in many buildings, apartments, public places providing complete coverage is a challenge. Radio "dead spots" can occur in areas where solid walls or appliances block a router's signal totally, or reduce it to become so weak that a portable Wi-Fi device, such as a mobile or tablet, cannot connect accurately. When electricity flows through the argon-mercury vapour in a fluorescent tube, it forms an ionised gas or plasma. Plasma has conducting properties comparable to a common metal radio antenna. This allows an attached router to send and receive radio signals through the light tube on the standard 2.4-gigahertz Wi-Fi frequency in exactly the same way it does through a normal antenna. The router's radio waves can ionise the gas in the tube, so it acts as an antenna even if the light is on or off.
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