Page "Synthetic aperture radar" Paragraph 88

Ultra-wideband ( UWB ) refers to any radio transmission that uses a very large bandwidth – which is the same as saying it uses very rapid changes in modulation.

Although there is no set bandwidth value that qualifies a signal as " UWB ", systems using bandwidths greater than a sizable portion of the center frequency ( typically about ten percent, or so ) are most often called " UWB " systems.

A typical UWB system might use a bandwidth of one-third to one-half of its center frequency.

For example, some systems use a bandwidth of about 1 GHz centered around 3 GHz.