Design of Low Sidelobe Antenna Array for 24GHz Vehicular Radar

A novel design method of a low sidelobe antenna array is proposed in this paper. By combining the Chebyshev array synthesis theory and the sparse array synthesis theory, the sidelobe level (SLL) of the antenna array is greatly reduced. Compared with the traditional Chebyshev array synthesis theory, the proposed method is effective to reduce the SLL of the antenna array (SLL reduced by 6.8 dB at Phi = 0° and SLL reduced by 4.5 dB at Phi = 90°). According to the method proposed above, an antenna array applies for 24 GHz vehicle radar is designed and simulated. The measured results show that the antenna has wide bandwidth (23.6 GHz~25.07 GHz, 1.47 GHz), high gain (20.7 dBi), and extremely low sidelobe level (−28.8 dB at Phi = 0° and −25 dB at Phi = 90°). In summary, the antenna with good performance and simple structure is easy to be integrated, which can provide some reference for the design of the 24 GHz vehicle radar antenna.