Slot antenna array with broadband low radar cross section using polarization conversion metasurface
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摘要: 提出了一种利用极化转换超表面(PCM)来缩减雷达散射截面(RCS)并保持缝隙天线阵列辐射特性的新型天线，在不影响天线性能的情况下实现了天线的宽带RCS缩减。该PCM由45°倾斜的开槽矩形贴片周期排布构成，它被放置在缝隙阵列天线的上表面，起到RCS缩减的功能。分析了RCS缩减的特点和原理，仿真和实验结果表明，带有PCM的缝隙天线阵在x极化和y极化波冲击下，单站RCS缩减带宽为8.0～21.8 GHz。同时天线的辐射特性在阻抗带宽、增益和辐射模式等方面都能保持良好性能。Abstract: A new type of unit that uses polarization conversion metasurfaces (PCM) to reduce the radar cross section (RCS) and maintain the radiation characteristics of slot antenna arrays is proposed. The PCM is composed of slotted rectangular patches arranged obliquely at 45°, which are placed on the upper surface of the slot array antenna. This paper analyzes the characteristics and principles of RCS reduction. Simulation and experimental results show that the single-site RCS reduction bandwidth of the slot antenna array with PCM is 8.0～21.8 GHz under the impact of x-polarized and y-polarized waves. At the same time, the antenna’s radiation characteristics are well maintained in terms of impedance bandwidth, gain, and radiation pattern.
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Key words:
- polarization conversion /
- slot antenna array /
- radar cross section /
- metasurfaces /
- broadband
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图 3 x极化照射下的单元的反射特性
Figure 3. Reflection characteristics of the unit under x-polarized illumination
图 4 电磁波极化转换原理示意图
Figure 4. Schematic diagram of electromagnetic wave polarization conversion principle
图 5 无限周期结构开槽矩形贴片及其镜像结构交叉极化反射波的相位差
Figure 5. Cross-polarized reflection phase difference between the infinite periodic slotted rectangular patch unit and the mirror unit
图 6 极化转换超表面结构示意图
Figure 6. Schematic diagram of polarization conversion metasurface structure
图 7 x极化波垂直照射下超表面和金属板的归一化单站RCS
Figure 7. Normalized single station RCS of metasurfaces and metal plate under vertical irradiation of x polarized wave
图 12 有无PCM缝隙天线阵反射系数的测量和仿真结果
Figure 12. Simulated and measured reflection coefficients of the antenna without PCM and the antenna with PCM
图 13 有无PCM缝隙天线阵10.4 GHz方向图
Figure 13. Radiation patterns with or without PCM slot antenna array at 10.4 GHz
图 14 缝隙天线阵的RCS仿真和测试曲线
Figure 14. Simulated and measured RCS of both antennas versus frequency
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