High gain array antenna for 24 GHz FMCW automotive radars

This article describes two high gain array antennas for 24 GHz FMCW automotive radar. The bandwidth of the antenna is improved by applying the slot-loaded technique. To further enhance the gain characteristics, series-fed and corporate-fed planar array antennas are developed, and their performance is studied. The measurement results show that the proposed array antennas have an excellent performance over the 24 GHz ISM band. The proposed array antennas are suitable for 24 GHz FMCW automotive radar applications.