Wireless data transfer may be the hottest trend in networking, but its newest tool is a 30-plus-year-old technology called ultrawideband.

Although the military has been developing the radio technology-which spreads signals out over a large swath of the radio spectrum rather than sending them at a single frequency-since its invention in the 1960s, the Federal Communications Commission only approved it for limited commercial use in February.

Ultrawideband promises low-power, high-speed data transfer-without the interference problems that plague existing wireless devices, since each transmission is sent in timed, subnanosecond bursts, and receivers ignore all but the in-sync signals. The same physics also gives ultrawideband properties useful for applications like "seeing" through walls and tracking objects in environments with too many obstacles for other radio technologies. A number of companies are gearing up plans for consumer applications.

"A lot of the systems that we have built for the government have immediate commercial interest as well," says Robert Fontana, president of Multispectral Solutions, a Germantown, MD-based ultra-wideband company. One example: a wireless intercom built for navy aircraft could be retooled to deliver in-home audio and video. Multispectral Solutions and its competitors plan to manufacture circuits that will enable devices like TVs and speakers to communicate using ultrawideband; each of the companies says it has development partnerships with unnamed consumer electronics companies.