| In recent years, with the substantial growth in car ownership and motor vehicle drivers in C hina, people have paid attention to the safe travelling. More and more manufacturers and consumers choose to install antomotive anticollision system on their motor vehicles. In view of some disadvantages of the automotive collision avoidance radar, and based on the commercial background, this research on the phased array antenna which can be used in automotive anticollision radar has been proposed.In this paper, we propose a microstrip phased array antenna model for antomotive anticollision radar. This antenna is designed operating at 24 GHz. It consists of 8×12 elements and each line array has 12 elements. In order to obtain the low sidelobe characteristic, the width of each element in line array is tapered in Chebyshev current distribution. The planar array makes use of 8-way unequal feeding network to achieve low sidelobe level. The feeding network is composed of unequal Wilkinson power dividers. The simulation results of the two parts show their good performance.Then co-simulation results by CST Microwave Studio of the unequal power divider feeding network and the array antenna are carried out. The phased array antenna gain is better than 24.6d B, and the beam widths in E-plane and H-plane are 6°and 12°with the sidelobe levels are-17.8dB and-21 dB. And the bandwidth is about 1.1GHz.In summary, the simulation results show the performance of the phased array antenna meets the requirement. Therefore the antenna is applicable in the automotive anticollision radar system. |
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