In this paper, the effect of interference from ultra-wideband (UWB) devices into Fixed Satellite Service (FSS) systems is evaluated. Some examples of the methodologies for the evaluation are also presented. UWB devices are expected to achieve high-speed short-range communication for a number of applications, and technologies for UWB devices are being studied at standardization bodies. In contrast to their benefits, the emissions from UWB devices would cause harmful interference into the existing FSS systems. We evaluate the magnitude of aggregate interference onto the uplink and downlink of the FSS systems. The results of the most studies so far indicate that the interference into the downlink in 4/7GHz band is more critical as compared to the interference into the uplink in 6/8GHz band. These results were sent to the special Task Group at ITU-R which considers technical issues to facilitate the study on the compatibility between UWB devices and rediocommunication services. Furthermore, a new technical approach to explore new satellite services using wideband spreading signals, which operate within frequency bands allocated to the FSS, is introduced. A preliminary analysis shows there will be a possibility to implement an economical service, e.g. broadcast type transmission, by virtue of technology imported from the terrestrial short-range communications.