Research of reducing the surface's RCS by using active periodical structure

How to reduce Radar Cross Section(RCS) of aircraft's surface effectively is important and key issue at the field of research of aircraft steal. Structural absorb is proposed in this paper, using the periodical surface's character of band gap and impedance transition of electromagnetic crystal structure such as Photonic band gap and high impedance surface(HIS) and so on, to put single or multilayer periodical structure on the surface of the shell of aircraft, and to put the Varactor Diode onto the approximate HIS to join each cell of metal on top layer to realize the electronic control for periodical structure, will establish the active periodical structure. This structure could realize absorbing the exotic electromagnetic wave and restrain surface wave on it. The result of above process is reducing the RCS of the surface of aircraft effectively. The simulation test prove that this method and technology could reduce RCS 3~14 dB at working frequency band by using single or double layer active periodical structure, and reduce RCS 20 dB with the ideal condition of multilayer structure, and the working frequency band could be changed and controlled by electronic method also.