Impulse based UWB radio is well known as a promising short-range communication technology to offer high speed data transmission and anti-fading capability. Furthermore it has recently attracted considerable attention for various consumer applications such as home security and vital-sign monitoring.
However, the commercialization causes a serious shortage of frequency resources in the RF spectrum. In this paper, a stepped-frequency UWB sensor is suggested which offers a solution to the frequency shortage for various emerging sensor applications. In order to investigate the usefulness, we fabricated the sensor system and conducted the measurement for a scenario.