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针对相位梯度超表面在隐身技术中的应用,提出通过表面波耦合和异常反射两种机制复合实现宽频带后向雷达散射截面(RCS)缩减,采用开口谐振环进行相位梯度设计,实现了一种二维极化无关相位梯度超表面,在10 GHz附近,超表面通过将垂直入射电磁波耦合为表面波实现RCS缩减,而在大于11 GHz的频率范围内,相位分布的不均匀性使垂直入射的电磁波发生漫反射或者异常反射,降低后向RCS,制作了厚度为2 mm的超表面样品,测试了其反射率曲线和后向RCS,并与相同尺寸的金属板进行了对比,实验结果表明,在宽频段内(9.5—17.0 GHz),超表面在垂直入射情况下可将后向RCS缩减至少10 dB,由于厚度薄、重量轻、频带宽,RCS缩减超表面在隐身新材料和新技术方面具有很大的应用潜力。
Aiming at the application of phase gradient superficial surface in stealth technology, this paper proposed a wide band RCS reduction by combining surface wave coupling and anomalous reflection, and designing phase gradient by using open-ended resonant ring. Two-dimensional Polarization Independent Phase-Gradient Super-Surfaces At around 10 GHz, super-surfaces achieve RCS reduction by coupling perpendicularly incident electromagnetic waves into surface waves, whereas in the frequency range greater than 11 GHz, the inhomogeneity of the phase distribution causes vertical incidence The electromagnetic wave is diffusely reflected or abnormally reflected, and the RCS is reduced to the backward direction to produce a super-surface sample with a thickness of 2 mm. The reflectivity curve and the RCS of the RCS are tested and compared with the same-size metal plate. The experimental results show that, In the wide frequency band (9.5-17.0 GHz), the superficial surface can reduce the backward RCS by at least 10 dB in the case of vertical incidence. Due to its thin thickness, light weight and wide bandwidth, the RCS reduces the superficial surface. In stealthy new materials and new technologies Has great potential for application.