Effects of surface texture on far field patterns of the reflector antenna

The machining quality of reflector antenna panels include machining accuracy and surface quality, both of them will effect electrical performance of the reflector antenna. For the surface quality which was studied less, surface texture were modeled by fractal function. Microscopic surface texture was introduced in the formula of antenna´s far field patterns by phase difference. Gaussian integral formula in triangular element was used in numerical solution of the formula. By simulation experiment, the effects of different amplitude, density and roughness described of the antenna panels´ surface texture on antenna´s far field patterns was studied. Research shows that: with the increase of amplitude, the far field pattern changes more; with the increase of density and roughness, the far field pattern change less. And the effect degree on far field pattern of amplitude is the first, the density is the second, the roughness is the least. A new way of study the effects of surface texture on far field patterns of the Reflector Antenna was proposed in this paper, and the conclusion can be referenced in practice.