Abstract: The frequency-polarization selective surface antenna to reduce radar cross section for airborne radar is investigated in this paper. Theoretical analysis and computation for two dimensional periodic structure FSS(Frequency Selective Surface) are established by vector mode methods on the basis of Floquet's theory, using mode voltage. Finally, an assembling structure of frequency-polarization selective surface is designed and manufactured to reduce radar cross section of airborne radar antenna. The numerical computation and experiment show that the characteristics inside the baseband of antenna have no change between FSS structure and primal polarization structure. FSS structure reduces radar cross section by 7- lOdB outside the baseband of antenna.

Key words: aircraft antenna, radar, radar cross section (RCS), frequency selective surface(FSS)