Simulation And Analysis Of Antenna And Radome Based On MoM In Two Dimensional Space

Radome is a equipment protecting the antenna from the bad external environment, to ensure the normal operation of the antenna equipment. In a variety of complex environments, such as navigation, aviation and so on, radome is indispensable. In addition to the protection of the antenna, it can be used according to different occasions, such as rectifier, heat insulation, easy operation, etc.. As the main part of the radome is usually composed of multi layer medium, it will cause great changes in the original electrical performance of a antenna loaded radome. The maximum radiation direction, gain, sidelobe level and other key parameters will change significantly, which will bring great difficulty to the design of the antenna. Through simulation calculation and analysis of the electrical performance of the antenna loaded radome,there is a lot of help for designing the antenna, saving time and costIn this paper, the method of moment method(Mo M) and physical optics method(PO) combine Surface Integration(SI), is used to simulate and analyze the linear array in the two-dimensional space. The main work includes the following aspects:Firstly, the method of moment is verified. The model simulating the antenna array loaded radome is built up.The model is simulated by the method of moment and the physical optics. The change of electrical parameters of the antenna, such as the dradiation pattern, the gain and the sidelobe level, is obtained. Then the main lobe is changed by phase control, and the electrical parameters are simulated. By changing the thickness and permittivity of the radome, the simulation is carried out to study the influence of these parameters on the electric parameters of the antenna loaded radome.Finally,a Chebyshev linear array loaded radome in a two-dimensional space is calculated,the analysis focus on the sidelobe level. it is found that the sidelobe level of Chebyshev array will be significantly increased, rising with the magnitude of the thickness of radome and the dielectric constant. In order to reduce the sidelobe level, the method of changing the antenna array excitation amplitude is used. The genetic algorithm was used to optimize the side lobe, by the Chebyshev distribution is modified, the side lobe level is reduced.