Design of microstrip array antenna for angle measurement based on dual-baseline method

An angle measurement antenna system, which consists of one transmitter antenna and three receiving antennas on the same substrate, is designed for the automotive anti-collision radar working in the K-band. For antenna design, Dolph-Tchebyscheff weighting method is used for its perfect balance between low side-lobe and high antenna gain. Besides, the dual-baseline method is adopted in the layout of four antennas to improve the angle measurement accuracy and widen the angle measurement range. At last, the antenna system is simulated and optimized, and the simulated results show that the transmitting antenna works correctly without coupling interference from receiving antennas.