Research On Composite Stealth Surface With Compound Mechanisms Of Wave Absorption And Anti-Phase Cancellation

With the continuous development of radar detection technology,modern national defense requires higher and higher radar stealth technology.However,the performance of traditional radar stealth surface with single mechanism has natural limitations,which is difficult to meet the increasingly demanding stealth technology requirements.In this paper,a new type of composite stealth surface with compound mechanisms of wave absorption and anti-phase cancellation is studied,i.e.the circuit analogue absorption mechanism and the anti-phase cancellation stealth mechanism are organically integrated on the same sub-surface,so as to overcome the performance defects of the single-machine stealth surface and realize the remarkable improvement of RCS reduction performance.The specific work is as follows:1)Two kinds of traditional radar stealth technologies-circuit analogue absorbing technology and anti-phase cancellation stealth surface technology are investigated,their stealth mechanisms are introduced and design examples are given respectively Specifically,two circuit analogue absorbers based on resistive square patch reflective array elements and resistive square ring reflective array elements are designed by equivalent circuit method.An anti-phase cancellation stealth surface is designed by arranging equal number of metal square ring reflective array elements and all-metal reflective array elements according to a checkerboard structure.The RCS reduction effect of each design has been verified by full-wave simulation results.2)Propose two types of composite stealth surface with compound mechanisms of wave absorption and anti-phase cancellation.Both types of surfaces are composed of two different configurations of reflective array elements.The first type of composite stealth surface achieves broadband RCS reduction mainly through the combination of low-frequency wave absorption and anti-phase cancellation,and mainly through high-frequency anti-phase cancellation.The second type of composite stealth surface achieves broadband RCS reduction mainly through low-frequency and high-frequency wave absorption and medium-frequency anti-phase cancellation.3)Two different configurations of resistive square patch reflective array elements are used to design the first type of absorbing-anti-phase-canceling composite stealth surface,and two different configurations of resistive square ring reflective array elements are used to design the second type of absorbing-anti-phase-canceling composite stealth surface.Theoretical calculation results show that the designed composite stealth surface has significantly wider effective RCS reduction bandwidth than the conventional single-plane stealth surface.The RCS reduction performance of single-station and double-station for two types of composite stealth surface design examples under TE polarization normal incidence is optimized by adjusting the proportion and arrangement of the two types of array elements.Finally,the RCS reduction performance of two optimized composite stealth surface design examples under oblique incidence and two different polarizations is also investigated.