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The design, realization, and test of the transmitting and receiving antennas for an FMCWradar operating between 24 and 24.25 GHz\ud(ISM band), to be housed in a white cane for improving mobility of visually impaired subjects, have been performed.The coaxial-to-\udmicrostrip transition necessary for feeding the antennas has been studied together with the characteristics of serial arrays of\udincreasing number of patches. Based on this study, a serial array with 8 patches has been selected for the transmitting and receiving\udantennas. The realized structures show a reflection coefficient lower than −10 dB in the ISM band. When the antennas are attached\udto an FMCW radar board, the radar is able to record reflections from a metallic panel up to a 5m distance

Serial Patch Array Antenna for an FMCW Radar Housed in a White Cane