Abstract: To solve the key technology of fabrication of large complex curved FSS(Frequency Selective Surface), a 5-DOF robotic digital machining system is studied and developed. Surface partition and fuzzy positioning method improve the machining efficiency of large complex FSS greatly as compared to the traditional machining technology. A sample of large curved-surface FSS and several planar FSSs are machined with the developed system. The measured transmission performances of the machined planar FSSs are compared with that of the printed planar FSSs, and the validity of the machining system is proved.

Key words: complex curved-surface, frequency selective surface, digital machining, transmission performance