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The team has a first-year provisional patent on the metamaterial textile design, which consists of a comb-shaped strip of metamaterial on top of the clothing with an unpatterned conductor layer underneath. These strips can then be arranged on clothing in any pattern necessary to connect all areas of the body. The metamaterial itself is cost-effective, in the range of a few dollars per metre, and can be bought readily in rolls.
“We started with a specific metamaterial that was both flat and could support surface waves. We had to redesign the structure so that it could work at the frequencies used for Bluetooth and Wi-Fi, perform well even when close to the human body, and could be mass produced by cutting sheets of conductive textile,” Asst Prof Ho explained.
The team’s particular design was created with the aid of a computer model to ensure successful communication in the radio frequency range and to optimise overall efficacy. The smart clothing is then fabricated by laser-cutting the conductive metamaterial and attaching the strips with fabric adhesive.
Once made, the ‘smart’ clothes are highly robust. They can be folded and bent with minimal loss to the signal strength, and the conductive strips can even be cut or torn, without inhibiting the wireless capabilities. The garments can also be washed, dried, and ironed just like normal clothing.
Next Steps
The team is talking to potential partners to commercialise this technology, and in the near future Asst Prof Ho is hoping to test the ‘smart’ textiles as specialised athletic clothing and for hospital patients to monitor performances and health. Potential applications could range dramatically — from measuring a patient’s vital signs without inhibiting their freedom of motion, to adjusting the volume in an athlete’s wireless headphones with a single hand motion.
“We envision that endowing athletic wear, medical clothing and other apparel with such advanced electromagnetic capabilities can enhance our ability to perceive and interact with the world around us,” Asst Prof Ho said.
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