目的 确定反射面天线表面涂层参数，并验证表面涂层参数对毫米波频段反射面天线电性能的影响。方法 采用金属导电率、金属层厚度、二氧化硅层厚度等参数，通过电磁软件仿真、涂层试片加工、电性能实测等方法对反射面电性能开展研究。首先对各种反射面表面涂层材料的参数及反射率的计算公式进行定性分析，再采用全波电磁仿真软件HFSS对不同表面涂层参数下的电性能开展电磁仿真，比较均匀平面波激励无限大平面的反射率参数性能。在确定涂层参数的基础上，加工试验样片，采用接收机等效噪声温度测量法，在54 GHz和183 GHz频段完成对涂层试片的电性能测试。结果 在理论分析、仿真计算取得一致的结果下，获取了天线反射面表面金属层厚度与反射率的关系，结合工程实际加工经验，确定了反射面金属层的建议厚度为1~2 μm。确定了金属层表面涂覆二氧化硅层在厚度小于2 μm的情况，对反射面天线电性能影响可忽略。获取了相同厚度的不同种类金属对反射面电性能的影响。结论 在理论分析与仿真分析结论的指导下，完成了1.8 μm铝+0.1 μm SiO2试验样片的加工及反射率实测，实测结果与仿真结论一致。

The work aims to determine the surface coating parameters of reflector antenna, and verify the influence of the surface coating parameters on the electrical performance of reflector antenna in millimeter wave band. The electrical properties of the reflector were studied by means of electromagnetic software simulation, coating sample processing and electrical performance measurement with different coating materials, different thickness of the same coating, different material combinations and other parameters. Firstly, the parameters and reflectivity formulas of various reflector surface coating materials were qualitatively analyzed, and then the electromagnetic simulation software HFSS was used to simulate the electrical properties of different surface coating parameters to compare the reflectivity parameters of infinite plane excited by uniform plane wave. Finally, on the basis of determining the coating parameters, the test samples were processed, and the electrical properties of the coating specimens were tested in 54 GHz and 183 GHz band by the receiver equivalent noise temperature measurement method. Under the consistent results of theoretical analysis and simulation calculation, the relationship between the thickness of metal layer on the reflector surface and the reflectivity was obtained. Combined with the engineering experience, the recommended thickness of the metal layer on the reflector was determined to be 1~2 microns, and the effect on the electrical performance of the reflector antenna could be ignored when the thickness of the metal layer was less than 2 microns. The effects of different kinds of metals with the same thickness on the electrical properties of the reflector were obtained. Under the guidance of theoretical analysis and simulation analysis, the processing and reflectivity of 1.8 microns aluminum + 0.1 microns SiO2 test sample were completed. The measured results are consistent with the simulation results.