K-band micro-strip antenna array applied in anti-collision radar

A K-band micro-strip array double-antenna applied in 24GHz automotive collision warning radar is presented in this paper. The double-antenna consists of two individual 14×6 elements arrays which both are placed on ROGERS RT5880 substrate with 0.254 mm thickness, one for the transmitter (TX) and one for the receiver (RX). The results of simulation show that the double-antenna has gain of 26.5dB and efficiency of 60%, the −10dB bandwidth is 1GHz from 23.6GHz to 24.6GHz, three-decibel beamwidth in azimuth is 6° and in elevation is 18°, the sub lobe suppression in azimuth is better than −20dB and in elevation is better than −15dB. The isolation between two antennas array is better than −32dB.