Agile design of cross-section enhancement of a conducting plate radar through active metasurface
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摘要: 提出了一种使用散射方向图的动态可重构以实现雷达散射截面增强的捷变设计方法。结合变容二极管加载，使用具有嵌入式偏置回路的物理单元，所提出的有源超表面可以在具有梯度电压的外加直流偏置下，对平面电磁波的正入射或斜入射产生可电调的反射系数相位分布，以达到对反射波角度的灵活重定向，进而有助于单站或双站雷达散射截面增强的捷变效果。以导电平板为例，对三种不同的入射反射场景进行了计算与全波仿真，在设计频率10 GHz处，所提出的设计产生了可重构的散射方向图，表明了该设计对反射波角度的实时控制，并结合实验测量验证了单站与双站雷达散射截面的有效增强结果。Abstract: The design concept of employing the dynamically reconfigurable scattering pattern to enhance radar cross-section is proposed and examined. In combination with varactor loading, a physical unit cell geometry with an embedded bias network for the varactors is utilized to build the metasurface. Biased by an applied direct-current source with voltage gradient, the proposed active metasurface can exhibit electrically tunable reflection phase distributions for either normal or oblique incidence plane wave, so as to achieve flexible redirection of the angle of reflection. As a result, the agile effect for monostatic or bistatic cross-section enhancement is then facilitated. Taking a conducting plate as an example, three different incidence and reflection scenarios are considered for calculation and full-wave simulation. Reconfigurable scattering patterns produced at the operating frequency of 10 GHz by the presented design are observed, which indicates its capability of real-time control of the angle of reflection. In conjunction with an experimental measurement, the effective enhancement of monostatic and bistatic cross-sections are validated.
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Key words:
- monostatic scattering /
- bistatic scattering /
- active metasurface /
- reconfigurable pattern
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图 1 平面电磁波照射下有源超表面的剖面示意图
Figure 1. Diagram of metasurface illuminated by a plane electromagnetic wave
图 2 超表面各单元的反射系数相位分布计算结果
Figure 2. Calculated reflection phase distributions for three scenarios
图 4 在TM极化正入射时反射系数相位在10 GHz随电容C的变化曲线
Figure 4. Simulated reflection phase varying with the capacitance C for TM-polarization normal incidence at 10 GHz
图 5 针对三种情形而得的变容二极管容值分布
Figure 5. Simulated varactor capacitance distributions for the three scenarios
图 6 有源超表面结构及其偏置网络示意
Figure 6. Diagram of the active metasurface structure and its biasing network
图 7 有源超表面和导电平板在三种情形时的雷达散射截面结果
Figure 7. Scattering cross-section by the active metasurface and conducting plate for the three scenarios
图 8 有源超表面和导电平板在10 GHz处xOz面的散射方向图
Figure 8. Scattering pattern in xOz plane of the active metasurface and conducting plate at 10 GHz
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