Antenna Design Of Vehicle Networking Radar Based On Metamaterials

With the rapid increase in the number of vehicles in our country and the vigorous development of artificial intelligence technology,the popularization of concepts such as intelligent driving and the Internet of Vehicles,and the development of modern science and technology,radar and antenna technology play an irreplaceable role in the Internet of Vehicles system.It has also developed rapidly.The mature application of vehicle-mounted radar antennas has greatly improved the driving safety of vehicles.Vehicles transmit and receive electromagnetic waves rely on antennas,and the radiation performance of the antenna has a direct impact on the detection of the radar system.In recent years,metamaterials with an artificial subwavelength structure offer new approaches to implement advanced antenna devices.Based on the unique electromagnetic characteristics of metamaterials,it is widely used in modern antenna design.There for,in this paper,we proposed a serious of the anti-collision radar of metamaterials in the Internet of Vehicles system and the absorbing structure of simulated targets in the active safety test system of automobile.Using the modulation performance of the metamaterial on electromagnetic waves,a series of metamaterialbased Vehicle radar antenna.The main research results are as follows:(1)In response to the urgent requirements for miniaturization and integration of vehicle antennas,metasurfaces are introduced into the design of vehicle antennas.Based on the sub-wavelength thickness of the metasurface,a broadband and efficient metasurface vehicle antenna is designed.This antenna can focus on electromagnetic waves at 24 GHz.At the same time,because the designed metasurface radar antenna has broadband performance,it can be used in a wide frequency range Can achieve focusing.It has great application prospects for improving the accuracy of vehicle radar ranging and increasing antenna gain.(2)In response to the need to improve the efficiency of automotive anti-collision radars,research and improve the existing active safety test system for automotive simulation target absorbing devices.According to the characteristics of the electromagnetic wave absorption loss of metamaterials,a broadband absorbing structure is designed.According to the electromagnetic wave absorption loss characteristics of metamaterials,a broadband absorbing structure is designed.This structure is based on the equivalent transmission line model and is composed of top metasurface,high-loss medium and metal ground.By analyzing the distribution of surface current and magnetic field energy,the working mechanism of the structure's perfect electromagnetic absorption is explained.Combining the current and magnetic field energy distribution of the metasurface layer,the electromagnetic wave absorption characteristics of the antenna structure are analyzed.And using simulation software to simulate the antenna's absorption bandwidth up to 1.4THz,the average absorption efficiency is above 96%.The effects of metal materials,split ring structure,and dielectric layer thickness on electromagnetic absorption are explored.In the case of TE and TM waves,the absorption efficiency has nothing to do with the incident angle,which proves that the antenna structure is insensitive to electromagnetic wave wide-angle polarization.