Study On Coupling Effect And Layout Of Vehicular Multi-antennas

With the development of communication technology,more and more antennas of different frequency bands are installed on the narrow platform of vehicles for that the requirements of information integration of combat vehicles in modern warfare are increasing,so the coupling effect of the antenna system is getting more and more serious which will lead to harmful electromagnetic compatibility problems.The layout technology of vehicle antennas plays a vital role in minimizing the mutual interference between vehicle antennas under the complex electromagnetic environment.According to the electromagnetic compatibility and computational electromagnetism theory,combining with the basic principles of antenna layout,using the CST MICROWAVE STUDIO to simulate the antenna performance,the pattern distortion of the antenna is placed on different carriers and the variation of the coupling degree between the antennas with the distance,and the antenna layout scheme is formulated after the simulation results are analyzed to solve the vehicle multi-antenna electromagnetic compatibility problem in this dissertation,and the scheme is verified in the end.The research work and contribution of this dissertation are as follows: 1.The electromagnetic model of vehicle and antennas are established.The vehicle electromagnetic model is obtained by using the CAE pre-processing software to simplify the real vehicle model.The whip antenna,the sleeve monopole antenna and the microstrip dualfrequency antenna are designed,and the performance of the above three antennas is simulated,the results show that the three antennas all have a good performance.2.The coupling effect between vehicle antennas is studied.The distortion of the antenna pattern is analyzed when the microstrip dual-frequency antenna is placed in different carriers such as free space and infinitely large conductive plane.The relationship between the coupling degree and the distance between the antennas is simulated and analyzed,and the minimum limit distance between antennas is given by taking the coupling degree less than-50 db as the index when the antenna is placed on the infinite conductor plane.3.The antenna layout scheme is obtained.Taking the high-altitude nuclear electromagnetic pulse as an example,by changing the direction of HEMP illumination,the distribution of the induced current on the vehicle surface is studied,and the suitable placement area for the antenna layout is obtained according to the result.According to the above simulation results,considering the antenna layout factors,the layout scheme of the antenna is formulated,and the layout scheme is verified and optimized by using the equivalent source method and the bouncing ray method.