This paper presents an experimental validation of a wake-up radio receiver (WuRx), allowing to both address and wake-up a main radio front-end, which has best performance but more energy consumption. The main goal is to reduce the total energy consumption of communicating objects by switching off the data transceiver module of each equipment during the periods when it is not used. The wake-up receiver is designed to be able to detect a wake-up signal which has a particular frequency signature and so, avoiding activating all main radio front-ends but only the one of interest. Moreover, the identification is performed in RF domain via passive circuitry and no base-band processing is needed.