Design and Simulation of Microstrip Comb Line Array Antenna at 78.5GHz for Automotive Radar Applications

Abstract

The design of low side lobe level 45 degree linearly polarized microstrip comb-line shaped travelling wave array antenna for 77GHz automotive radar applications is presented. The 20 elements array is designed on Astra Isola substrate material. Variable width radiating elements are incorporated in the design to utilize an amplitude tapering technique to achieve lower sidelobe level. Taylor distribution is used to determine voltage excitation. The measured gain is found to be around 16.23dB and the side lobe level of -14.28dB at 78.5GHz.