http://search-engines-web.com/ writes “ University of Michigan researchers have figured out how to build wireless systems even smaller while still retaining range and power efficiency.
http://www.sciencedaily.com/releases/2004/07/0407
One obstacle to further shrink small wireless devices has been trying to fit all the components onto one chip but U-M researchers have built a tiny silicon-compatible antenna and frequency resonator that will do just that.
The antenna and resonator are two of the most problematic off-chip components in wireless systems. The two components require large amounts of space off the chip—think of a cell phone antenna extending outward—thus limiting how small a device can be built.
We could have cell phones almost the size of an earpiece,” Flynn said. “You could have sensor nodes that are almost invisible, you could just sprinkle them around.”
Rather than using a traditional wire antenna, researchers built a slot antenna. In a slot antenna, instead of the metal wire, imagine covering an entire plane with metal, leaving only a slot or groove in the metal bare. Wire surrounds the groove so it’s much more effective at radiating electromagnetic waves in a small antenna, Sarabandi said. Because of the antenna’s shape, the wireless system does not need a network to match the antenna’s frequency to the rest of the electronic device.
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http://www.eecs.umich.edu/RADLAB/bio/sarabandi.di
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