We adore what’s in our wardrobe to be multifunctional, and we have seen threads do double duty as keyboards , flashlights or even drum kits in our day. Now, researchers at Ohio State have get a hold of the way to turn the shirt for your back into an omnidirectional antenna to lift radio reception. To take action, they etched brass wires into plastic film to create flexible antennae, and stitched 4 of them into the shoulders, chest and back of a vest. Using a working laptop or computer controller the scale of a deck of cards clipped to the wearers belt, the system senses body movement and activates the suitable antenna to get one of the best signal. You spot, antennae don’t work so well when touching human skin — as any iPhone 4 owner can attest — and the multiple antenna system alleviates that problem while providing “significantly greater signal strength” than a common antenna. The researchers see the technology having great appeal for the army, law enforcement, and emergency personnel, but here’s hoping they make a client version, too. It might be nice to eliminate all those cell-service dead spots by simply donning a jacket, right?
COLUMBUS, Ohio – A higher generation of communications systems will be built with a stitching machine.
To make communications devices more reliable, Ohio State University researchers are finding the way to incorporate radio antennas directly into clothing, using plastic film and metallic thread.
Within the current issue of the journal IEEE Antennas and Wireless Propagation Letters, they report a brand new antenna design with a selection four times larger than that of a traditional antenna worn at the body – one who is utilized by American soldiers today.
“Our primary goal is to enhance communications reliability and the mobility of the warriors,” said Chi-Chih Chen, a research associate professor of electric and computer engineering at Ohio State. “However the same technology could work for law enforcement officials, fire fighters, astronauts – anybody who must keep their hands free for important work.”
For typical foot soldiers, mobility and communications are usually at odds. An antenna is known as a large and unwieldy addition to an already heavy load.
The assumption of embedding communications devices in clothing to handle this problem isn’t really new, Chen explained. The Ohio State system takes elements from previous research and combines them in a brand new way, with the addition of a different computer control device that lets multiple antennas interact in one piece of clothing.
The result’s a communications system that may send and receive signals in all directions, even through walls and inside a building, and not using a need for the wearer to hold an external antenna.
John Volakis, the Roy & Lois Chope Chair Professor and Director of the ElectroScience Laboratory at Ohio State, found a typical analogy for the brand new design.
“In a fashion, we’re doing what’s already been done on a mobile phone. You do not see cellphones with external antennas anymore, since the antenna is a part of the body of the telephone,” Volakis said.
When antennas make contact with the human skin, however, the body tends to soak up radio signals and form a quick circuit – a fact driven home by the new difficulties with the antenna placement at the iPhone 4. Also, if an antenna is badly placed, a person’s body can block it when she or he moves against a wall or other obstacles.
The Ohio State system overcomes these problems by surrounding the body with several antennas that interact to transmit or receive a signal, regardless of which way somebody is facing. An integrated computer control device senses body movement and switches between the antennas to activate the only with the right performance given the body’s position.
The engineers created a prototype antenna by etching thin layers of brass on a commercially available plastic film, called FR-4. The film is light and versatile, and will be sewn onto fabric.
They attached it right into a vest at four locations –chest, back, and both shoulders. The pc controller – a metal box a touch smaller than a mastercard and an inch thick – was worn on a belt.
In laboratory tests, the experimental antenna system provided significantly greater signal strength in comparison to a standard military “whip” antenna, enabling a number communications four times larger.
Perhaps most significantly, the brand new antenna system worked in all directions, at the same time as researchers tested it within the hallways of the ElectroScience Lab, where doors and windows would typically interfere with the signal.
Key to the technology was the engineers’ development of network communications coding to coordinate the signals one of several antennas. Doctoral student Gil-Young Lee developed a working laptop or computer module to make the antenna control automatic. Lee, Chen, and Volakis co-authored the IEEE paper with Dimitrios Psychoudakis, senior research associate on the ElectroScience Lab.
They’re partnering with an antenna design company, Applied EM of Hampton, VA, to commercialize the research, which was funded by a Small Business Innovation Research grant.
Chen currently estimates that the antenna systems, as demonstrated inside the prototype, would cost $200 per person to implement, but mass production would bring that cost significantly down.
Meanwhile, the engineers are engaged on printing antennas directly onto clothing, and embroidering antennas into clothing with metallic threads. a normal home sewing machine is now portion of their laboratory equipment, and early tests have shown that the swirly designs they’ve embroidered into fabrics consisting of cotton – or even taffeta – can work as functional antennas.
That’s why Volakis envisions the technology to be adaptable for most people. The elderly or disabled could wear clothing that might allow them to communicate in case of emergency, without the stigma they could feel in wearing a more visible assistive device.
“Imagine a vest or shirt, or perhaps a fancy ball gown made with this technology,” he said, scrunching a sample of embroidered taffeta in his hand. “The antennas will be inconspicuous, or even attractive. People would need to wear them.”
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