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The Ultra Wide Band (UWB) is a technical of radio transmission which consists of using signals whose spectrum is spread out over a broad frequency band, typically ranging from MHz to several GHz frequencies. It was at first used for radar applications then applied in telecommunication applications, thus arousing a growing interest within the academic and industrial community.In a UWB radar system, the transmitter generates a sequence of short pulses with duration of the order of hundreds of picoseconds. These pulses excite the antenna and are radiated in space; then, the pulses are reflected by the target. The reflected pulse arrives to the same or another antenna and, if the target moves, the system is able to detect this movement from the changing in the arrival time of the received signal.The present work is concerned with a research on UWB as a new technology. This paper focuses on the design of a receiver system with ultra wide band using the tool of modelling Agilent Advanced Design System.

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