The Analysis And Design Of X And Ka Band Airborne Radome

Radome is widely used in various fields of wireless. In the past few decades, radome has been developed in its structure, and using materials, etc. The analysis of radome can be divided into three categories, which include high-frequency algorithm, low-frequency algorithm, and the high and low frequency combination algorithm. With the trend of high-frequency current flagship, high-frequency algorithm gradually hold a larger share of the market. In order to analysis the electrical performance of electrically large(1568mm × 935 mm × 557mm), and dual-band antenna radome, this paper provides an accurate simulation analysis software. After research and analysis, this paper adapts two high-frequency analysis method: aperture-integration and surface-integration(AISI) method and ray tracing(RT) method. And, the preparation of the relevant calculation program have been completed.Firstly, the equivalent circuit method has been adopted in this paper to analysis the transmission coefficient and reflection coefficient of multilayer dielectric plate. In order to verify the accuracy of the program, we compared the calculation with the simulation results of CST software. As we all know, it is difficult to fit with analytic functions for the complex structure shape of radome. Therefore, it is necessary to use ANSYS software to mesh radome model, then triangular surface units were obtained. Seeing Each unit is similar to a plate, then we can use equivalent plate theory to analysis its electrical properties. It is detailed analysis in this paper that the relative positional relationship between the biaxial scanning antenna and radome.Secondly, it is compared the results of RT method and AISI method with the simulated results of CST software to verify the accuracy of complied software. Comparative examples include: an ideal source antenna and a flat slot antenna are both under a sandwich radome in X band, and the results of the simulation program and calculated results of their far-field patterns at different scan states have been analyzed. In the dual-band X and Ka band, an ideal source array under a sandwich radome, the algorithm and simulation results were compared and analyzed. The results shows: RT algorithm, AISI algorithm results and CST simulation results are in good agreement; the far-field pattern and sidelobe level of an array antenna with a radome will be influenced by its metal surface reflect; the RT algorithm is faster than AISI algorithm, but its accuracy is related low. Compared with CST software, RT algorithm and AISI algorithm can analysis and design large size and complex structure radome.Finally, the radome has been processed and measured. And the far-field pattern of the flat slot array antenna with radome or not were analyzed. Among them, the penetration rate of the wave, side-lobe level elevation and other indicators meet the basic requirements of cooperative units. Meanwhile, put the actual measured near-field data into the AISI algorithm, and the far-field pattern will be obtained. Then, compare the results with the measured far-field pattern, and the results shows in good agreement, which fully verify the correctness of the algorithm.