If you're looking for a smaller, cheaper antenna to conduct Wi-Fi signals, you ain't gonna find it. Using special printing technology, researchers have discovered a way to cheaply mass produce antennas so small they approach the lower physical limit for high bandwidth antennas.
This could lead to new generations of wireless consumer electronics and mobile devices that are either smaller or can perform more functions. The antenna is typically the largest wireless component in mobile devices. Shrinking it could leave more room for other gadgets and features, said Anthony Grbic, an associate professor in the University of Michigan Department of Electrical Engineering and Computer Science.
Grbic and Stephen Forrest, a professor in the departments of Materials Science and Engineering and Physics, led the development of the hemisphere-shaped antennas, which can be manufactured with innovative imprint processing techniques that are rapid and low cost. The finished product is 1.8 times the fundamental antenna size limit, known as the Chu Limit after the scientist who discovered it. Any smaller, and the antenna could not receive high bandwidth wireless data signals.
"Ever since the Chu limit was established, people have been trying to reach it. Standard printed circuit board antennas don't come close. Some researchers have approached the limit with manually-built antennas, but those are complicated and there's no efficient way to manufacture them," Grbic said. "We've found a way to reduce the antenna's size while maximizing its bandwidth, using a process that's amenable to mass production."
The researchers' prototype operates at 1.5 gigahertz, in the frequency range of Wi-Fi devices as well as cordless and mobile phones. The antenna is 70 percent efficient and ten-times smaller than conventional antennas, Grbic said.
"It can be used to fabricate antennas that are of a wide variety of sizes, shapes, frequencies, and designs," Pfeiffer said. "Basically if you tell me the data rate that is required for a particular application, I can make an antenna that does this while at the same time being as small as possible."
Beyond consumer electronics, this work could be useful in wireless sensing and military communications. Wireless sensor networks could be used for environmental monitoring or surveillance.
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