Efficient Simulations And Analyses For Antennas Integrated With Radome

The radome is a part of the electronic system of modern high-speed aircraft.A radome is used to protect the enclosed radar or communication antenna.It needs to be electromagnetically transparent in the operating frequency band,with anti-reflection and low-loss properties.Since the radome-antenna model is a multi-scale complex system,its research requires a lot of calculations.In this thesis,the Method of Moments and its fast solver-Multilevel Fast Multipole Algorithm are used.On the premise of ensuring the accuracy requirements,with the help of high-performance computing platform,the integrated model of the antenna with radome is simulated and calculated.By using the Multilevel Fast Multipole Algorithm to calculate the scattering problem of the radome,compared with the Higher Order Method of Moments,the advantages of the Multilevel Fast Multipole Algorithm are proved in terms of computational efficiency and resource consumption.Then,the antenna with radome is simulated and calculated,and the changes of the pattern with and without the radome are analyzed.Aiming at the factors that affect the electrical performance of the antenna system with radome,the Multilevel Fast Multipole Algorithm is used to analyze the variation of the number of antenna array elements and the thickness of the cover wall on the electrical performance.Firstly,the influence of the change of the number of antenna array elements on the electrical performance of the radome under different phase sweeps is studied.The simulation analysis shows that when the number of antenna array elements increases,the wave transmission performance during the elevation angle scan does not change much.It is shown that the main beam offset is improved,the zero-depth offset of the difference beam is reduced,and the sum and difference zero depth becomes smaller.The transmission performance and the offset of the main beam during azimuth scanning are improved,the zero-depth offset of the difference beam is reduced,and the sum and difference zero depth becomes smaller.Therefore,for the radome used in this thesis,when the number of antenna array elements increases,the electrical performance of the radome is improved to a certain extent except for the sum and difference zero depth.Secondly,the influence of the thickness of the radome wall on the electrical performance of the radome is studied.The simulation analysis found that when the wall thickness of the radome gradually increased,the electrical performance of the radome gradually deteriorated when the elevation angle and azimuth angle were scanned,especially the wave transmission performance and the zero depth of the sum and difference.Aiming at the problem of poor performance after the antenna is covered,under the premise of accurate calculation,the Differential Evolution algorithm combined with the Higher Order Method of Moments is used to optimize the sum-difference beam.The electrical performance with and without the optimization is compared.The minimum rate is increased by 6.97%,the maximum main lobe angle offset is reduced from 0.8° to 0.2°,the zero-depth angle offset of the difference beam is all corrected to 0°,and the zero-depth level value is reduced from above 0d Bi to-12 d Bi the following.In addition,the optimization effects of the Differential Evolution algorithm and the particle swarm optimization algorithm are compared.The feasibility and superiority of the differential evolution algorithm used in this thesis for the integrated optimization of the radome antenna are shown.