Millimeter Wave Microstrip Antenna Array for Automotive Collision Avoidance Radar

A 24GHz millimeter wave series-fed microstrip antenna array is presented in this paper. The simulation results of the proposed antenna show that the VSWR is lower than 1.5 and the gain is higher than 24dBi over the operating bandwidth from 24GHz to 24.25GHz. The power radio in both E-plane and H-plane follows the Chebyshev distribution for lower sidelobe level(SLL). The half power beamwidth(HPBW) is about 13° in the E-plane and 5.5° in the H-plane. And the SLL is lower than 16dB in the E-plane and 22dB in the H-plane, which makes it a good candidate for automotive collision avoidance radar.

I. Introduction

With the rapid development of economy, the number of cars has increased greatly. In order to avoid traffic accidents, it is important to improve the safety and reliability of automobiles. Automotive collision avoidance radar is a vehicle assistant driving system that can prevent accidents. There are many types of automotive collision avoidance radar, such as ultrasonic radar, laser radar, millimeter wave radar and so on. Millimeter wave radar has the advantages of round-the-clock, multi-dimension information, higher resolution radio and measurement accuracy. Therefore, it has a great market value. ¹