A 77GHz High-Directivity Antenna with Stacked Patches for Automotive Radar

Abstract

In this paper, a microstrip array antenna loaded with double-layer parasitic stacked patches is design at 77 GHz for the application of long-range automotive radar. The array antenna works as the radiation source, the parasitic patches work as directors and the ground operates as the reflector. The estimated directivity is enhanced to 22.87 dBi, 3.16 dB higher than the original microstrip array antenna. The measured half power beamwidth is 8° in E-plane and 22° in H-plane while the impedance bandwidth is from 76.15 to 77.46 GHz, which agree with the simulated results reasonably.