Abstract: After optimization of envelop materials, sandwich materials and bonding materials, the composite of wave transparent materials have been proposed and adopted, which can be suitable for frequency selective surface of sub-reflectors with S/X/Ku/Ka four bands. Forming technologies of precisely curved dipole oscillator, which has good processing stability and high yield, were applied based on the research of curved oscillator forming and sub-reflector forming. A four-band frequency selective surface of sub-reflectors was obtained with the accuracy of 0.08mm (r.m.s) and the transmission loss of less than 0.25dB at S/Ku-band.

Key words: composite materials, multi-frequency selective, antenna sub-reflectors, four bands frequency, wave transparent materials