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This paper presents the design of a frequency‐modulated continuous wave (FMCW) radar system for the short‐range vehicle detections at K band. The antenna system employs phased arrays to control the radiation patterns to simplify the signal process complexity, which are implemented separately for the transmitter (TX) and receiver (RX), respectively. In particular, the space and angular beam diversities are implemented for RX channels to enhance the detection accuracy. The system is implemented at 24.125 GHz with a bandwidth of 250 MHz, which is used to realize a linear frequency modulation with a TX power of 1 mW. The detection is determined by considering the peak values of signal responses obtained by performing the fast Fourier transform over the signals received by the two RX channels. In this paper, the system architecture is first overviewed, the antenna designs are afterward presented to show their radiation characteristics, and finally, the system is experimentally examined to demonstrate the feasibility.

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