Issue link: https://resources.mouser.com/i/1520712
18 Next-Gen Connectivity for Smart Living The Federal Communication Commission (FCC) has defined UWB systems as those operating with an absolute bandwidth—larger than 500MHz—with maximum power density at a central frequency (f c ) above 2.5GHz, or fractional bandwidth greater than 0.2 with f c lower than 2.5GHz. Figure 9 illustrates the calculation of absolute bandwidth (B) and fractional bandwidth. Maximum power density is at the central frequency f c , and f H and f L are the high and low frequencies at which the power spectral density is 10dB below f c . B frac is defined as B/f c . In terms of high and low frequencies, we have The UWB radio frequency range, as defined by the FCC, is between 3.1GHz and 10.6GHz (Figure 10). The FCC and other organizations also limit the power of UWB transmissions to avoid interference with other technologies. Although UWB's large bandwidth is a very useful property, it means that the frequencies used by UWB overlap with those used by other communications technologies (Figure 11). so Figure 9: Power spectrum of a UWB system's low, central, and high frequencies. (Source: Qorvo) Figure 10: FCC-defined radio frequency ranges for UWB. (Source: Qorvo) Figure 11: UWB frequencies coexist with other wireless technologies. (Source: Qorvo)