| MoM analysis of electromagnetic compatibility in the automotive application and research With the continuous development of the automobile industry, electronics technology applications in the automotive, cars are from the traditional toward the mechanization era into the era of electronic. How to solve the electromagnetic compatibility of electronic equipment (EMC) issues, to improve vehicle reliability and safety to ensure that vehicles do not interfere with the normal work around the equipment, at the same time not be interference with the surrounding electromagnetic environment, has become a very important and urgent study. EMC antenna is based on electromagnetic field theory on the basis of a comprehensive science and technology applications. In particular, car antennas electromagnetic compatibility analysis and forecasting and design of the overall performance of the vehicle plays an important role, and sometimes even play a prerequisite role. From several decades of development practice, the antennas own electromagnetic compatibility superiority and inferiority of the whole system of electromagnetic compatibility of the harm caused by or in turn brought about the whole system is a considerable contribution.In this paper, method of moments as the main means of research, combined with practice in the automotive electromagnetic compatibility problems. Its main contents are:1. Automotive electronic industry continues to develop, making the car more and more electronic products, electronic equipment of motor vehicles to increase economy, safety and comfort, but also to the issue of electromagnetic compatibility has become more complex. This paper introduces the concept of moment method and the principle of electronic devices in light of the actual vehicle to vehicle electronic equipment electromagnetic compatibility analysis, the realization of electronic devices for automotive electromagnetic compatibility prediction analysis, by a large number of examples show the algorithm in the electromagnetic Analysis of the advantages of compatibility.2. MoM integral equation is based on the electromagnetic field of the numerical method is an accurate and stable calculation. The main advantage of integral equation is that on the one hand, Green's function as a result of the introduction of electromagnetic radiation in the infinite distance conditions are included in the analysis of integral equation, so that the relationship between the unknown quantity can be accurate to avoid numerical dispersion; another On the one hand, it generates the number of unknowns in general less than a lot of micro-classification of equations, more applicable to the calculation of electromagnetic scattering from electrically large. Moment method will be introduced to the real electromagnetic problems to give full play to its advantages, and expounded the concept of electromagnetic compatibility antennas and electromagnetic compatibility between antennas in the system an important role. And briefly introduced the moment method and the solution of matrix equation.3. Selected a line of antennas, antenna Gaussian bending moment method analysis, the first oscillator to the antenna symmetry MoM analysis, but also on the curve of oscillator moment method for analysis, by analyzing the Gaussian curve antenna oscillator obtained symmetrical Gaussian shape of the antenna is the best antenna good approximation, in the gain, directional indicators, such as more linear symmetrical oscillator conclusions are better, and satisfactory results.4. Because of the prevalence of the same system to work more than the case of the antenna, so the issue of multi-antenna electromagnetic compatibility is particularly prominent, and the same, in-car multi-antenna system electromagnetic compatibility analysis is imperative, on the basis of this article , to use MoM grid and microwave methods, the establishment of a simple body model, and in the system set up four joint work of the antenna. At the same time, the use of point matching method to solve the current antenna. The results of the previous literature reference verified. At the same time, inter-antenna coupling to the simulation, so that it closer to the actual engineering application, and satisfactory results. And on this basis, a vehicle-mounted antenna to the problem of electromagnetic compatibility, electromagnetic properties of the wire antennas are analyzed, and the car got into the multi-antenna system modeling and simulation, have been relatively satisfied with the test results.Therefore, vehicles, ships and aircraft and other large multi-antenna systems, the complexity of the electromagnetic phenomena, the mutual interference between the serious, but because of model complexity, the precise simulation of very complex, and bound by the software and hardware is also very strong. Vehicle multi-antenna system design in particular, the complexity, especially in the limited space of the roof of the local concentration of a variety of antennas, a variety of communications equipment at the same time work with the frequency generated by interference, harmonic interference, adjacent channel interference will make car communication systems constitute a complex electromagnetic environment of space, it is difficult to use theoretical methods for analysis. This chapter MoM-based simulation analysis, trying to give way to a system, that is, through the car antenna isolation system simulation analysis based on the layout of the antenna given the frequency of the use of strategies and systems, through the far-field gain pattern of the simulation analysis given loading platform and the other antenna on the target the impact of the antenna, so as to vehicle design of multi-antenna system to provide simulation method and simulation data. In the actual system, but also through the actual test and simulation analysis of test data to amend the relevant parameters and model. Through simulation analysis and experimental verification of the continuous cycle of iteration, and continuously optimize the system design. Therefore, the method and practice for the actual engineering of the electromagnetic compatibility of communication systems effective computing and forecast is very important. |
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