A new type of radio technology called Ultra Wideband (UWB) is in the process of establishing itself throughout the world. This technology is predestined for deployment for short-range communications and in sensor technology. The UWB technology is based on the wireless transmission of pulse-shaped signals over radio channels with a considerable bandwidth at low radiated power levels (up to a maximum of 1 mW). UWB occupies bandwidths up to several GHz and as such is much wider than the frequency bands occupied by, for example, the mobile communications services GSM and UMTS.
Since with the rise in the availability of bandwidth transmission capacity increases as well, future UWB systems will be able to provide useful bit rates right up into the Gbit/s range covering distances of up to about 10 m for communication purposes. In view of its high transmission rates UWB may well be considered a serious contender to existing short-range systems such as Bluetooth and NFC (Near Field Communication). From another perspective UWB could be viewed as a supplement to broader-range WLANs, for example where multimedia terminals are connected to the WLAN core network via UWB.
Germany's Federal Network Agency issued a general type approval for the use of UWB devices in the frequency range 30 MHz to 10.6 GHz at the beginning of 2008. Present-day UWB short-range radar systems use the frequency range 22.0 to 26.6 GHz.
In comparison with broadcasting and mobile radio transmitters UWB transmitters operate with substantially lower radiated power levels (maximum 1 mW). In the course of its 2008 project focusing on the determination of exposure to Ultra Wideband technologies, the Deutsches Mobilfunk-Forschungsprogramm carried out comprehensive theoretical analyses and measurements of the exposure to be expected in the case of UWB devices. In its final report the Deutsches Mobilfunk-Forschungsprogramm came to the conclusion that the SAR values identified are several orders of magnitude, i.e. less than one tenth of one per cent, below the recommended limits.