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提出了共享孔径雷达吸波材料(shared aperture radar absorbing material,SA-RAM)的设计方法.该方法将无源人工电磁媒质(metamaterials,MTM)的散射问题等效为有源阵列的辐射问题进行研究,利用阵列天线原理对有限周期MTM单元构成的MTM子孔径的位置信息、幅度信息、相位信息进行优化设计,实现具有不同功能的SA-RAM.在此基础上,设计了一种基于人工磁导体(artificial magnetic conductor,AMC)子孔径和完美吸波体(perfect metamaterial absorber,PMA)子孔径的SA-RAM,该SA-RAM通过将AMC子孔径与PMA子孔径交错布阵,实现了具有吸波和相位相消特性的SA-RAM.仿真和实验结果表明,该SA-RAM较金属板的后向雷达散射截面(radar cross section,RCS)在5.5—8.3 GHz都有明显的减缩,在5.54 GHz处的减缩是由于PMA的高吸波率引起的,在7.0 GHz处的减缩是由于AMC子孔径和PMA子孔径相位相消引起的.研究结果对频域和空域隐身相结合的雷达吸波材料设计具有重要的指导意义.
A design method of shared aperture radar absorbing material (SA-RAM) is proposed, which solves the problem of scattering of passive artificial metamaterials (MTM) equivalent to the radiation problem of active array , An array antenna is used to optimize the position information, amplitude information and phase information of the MTM sub-aperture formed by finite-period MTM elements to realize SA-RAM with different functions. On the basis of this, a new design method based on artificial magnetic conductor (AMC) sub-aperture and the perfect metamaterial absorber (PMA) sub-aperture SA-RAM. By SAF sub-aperture AMM sub-aperture and PMA sub-aperture staggered array to achieve a wave with the wave And phase-canceled characteristics of SA-RAM.The simulation and experimental results show that the SA-RAM has a significant reduction from 5.5-8.3 GHz for the radar cross section (RCS) of the metal plate, Reduction due to the high absorption rate of PMA, the reduction at 7.0 GHz is due to the cancellation of the phase difference between the AMC sub-aperture and the PMA sub-aperture. Absorber design has important significance.