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  CNET GLOSSARY: Terms for the techie
UWB
Ultra Wide Band An emerging wireless technology that sends signals in extremely short pulses over a wide swath of the radio frequency spectrum. The technology has numerous advantages. Because the power required to send these pulses is very low, the signal can pass through doors and other obstacles (such as the ground) that would reflect a higher-powered signal; also, UWB devices don't need a lot of juice to operate. The brevity of each signal pulse, measured in billions per second, is very hard to detect, giving it some intrinsic security. And because the signal is spread over such a wide bandwidth, the risk of interference is low. This technology is also used for ground-penetrating radar devices. 
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