UWB devices are understood as any device transmitting electromagnetic waves, which occupies a relative bandwidth of 20% or more of the centre frequency or an absolute bandwidth of 500 MHz or more.
Dependent on the application, UWB systems would generally have relatively small average power associated with a possible high peak-to-average ratio, therefore both peak and average power should be considered.
Source: ECC Report 64 [979 KB]
See also: ECC Decision 0604 [49 KB]
'ECC Decision of 24 March 2006 on the harmonised conditions for devices using Ultra-Wideband (UWB) technology in bands below 10.6 GHz'