人工磁导体正交布阵的宽带低雷达截面反射屏*

摘要

Based on the electromagnetic properties of complementary split ring resonator (CSRR), a novel artificial magnetic conductor (AMC), CSRR-AMC, is designed. The comparison of the reflection phase with square patch AMC reveals its features of miniatur-ization and multiband in-phase reflection, under X- and Y-polarized normal incident waves, respectively. Inspired by the reflection phase difference under different incident conditions, we have designed a wideband low rader cross-section (RCS) reflection screen with a single CSRR-AMC structure. The CSRR-AMC arrays are orthogonally positioned and the backscattering energy is reduced as a result of phase cancellation. Measured results demonstrate that -10dB RCS reduction is achieved in a wide frequency range of 7.38-10.47 GHz and the relative bandwidth is 34.6%, providing a new method for the design of wideband low scattering structure.%　　基于互补开口谐振单环(complementary split ring resonator, CSRR)的电磁特性,设计了一种新型人工磁导体(artificial magnetic conductor, AMC)结构 CSRR-AMC.通过与方形贴片人工磁导体的反射相位对比发现,该结构在 X 极化和 Y 极化波垂直照射条件下可分别实现小型化和多同相反射频带.基于此特性,设计了一种仅由单一CSRR-AMC 结构组成的宽带低雷达截面反射屏.该设计将相邻 CSRR-AMC 单元正交化排布,通过优化单元结构实现宽带相位对消,降低后向散射能量.测试结果表明,样品在7.38-10.47 GHz 范围内后向 RCS 减缩量达到10 dB 以上,相对带宽达到34.6%,为宽带低反射屏设计提供了新的方法.