Shifted Beam Microstrip Array Antenna for Velocity Detection Radar

摘要

Radar can be used for vehicle speed detection application to reduce the number of traffic violation and car accident. One of its components is the antenna. In this paper, a design of 3×8 microstrip array antenna on Epoxy FR-4 substrate with a dielectric constant of 4.6 was developed. Antenna is designed and simulated using CST software. The working frequency is in the ISM Band of 2.4 - 2.5 GHz with return loss-10 dB. The simulation results show that the array antenna operates at frequency 2.35 - 2.53 GHz or bandwidth of 172.6 MHz. In addition, the antenna has a gain of 7.56 dB, horizontal beamwidth of12.5o, vertical beamwidth 52.6°, and the main lobe shifted to 36° toward ground. The measurement results show that the array antenna operates at frequency2.38 - 2.56 GHz or bandwidth of 177 MHz. Moreover, the antenna has gain of 7.1 dB, horizontal beamwidth of 14°, vertical beamwidth 56°, and the measured main lobe shifted to 28° toward ground.