具有极化选择性的长城式水基可开关频率选择雷达
Great Wall-like Water-based Switchable Frequency Selective Rasorber with Polarization Selectivity
摘要：
本文提出了一种基于长城结构的具有偏振选择性的水基可开关频率选择性激光吸收器。所提出的结构包括一个容器，该容器包含水平和垂直通道，使得能够可分割地注入水，以及一个交叉间隙FSS。该设计的新颖性在于其通过向水道中注水或不注水而在四种不同的操作状态之间切换。当容器为空时，该结构充当在3.75 GHz处具有-0.42 dB插入损耗通带的偏振密集型FSS。当水平通道中充满水而垂直通道中没有水时，这种结构可以用作具有单极化选择性的FSR。具有从6.8 GHz到18.8 GHz的-10 dB吸收频带的FSR仅允许某些极化电磁（EM）波以-0.78 dB的插入损耗在3.1 GHz处通过，而另一极化EM波不能通过。当容器充满水时，该结构作为吸收器工作，其反射带低于吸收带，其中偏振EM波都不能透射。此外，建立了可重构的水基FSR自动控制系统，实现了容器内水的状态切换和温度恒定。最后，对所提出的设计方案进行了样机制作、仿真和测量，验证了设计方案的可行性.该工作在天线罩设计中具有潜在的应用价值，可实现带外RCS减缩。
英文摘要：
A water-based switchable frequency selective rasorber with polarization selectivity using the Great Wall structures is presented in this paper. The proposed structure comprises a container containing horizontal and vertical channels enabling dividable injection of water, and a cross-gap FSS. The novelty of the design lies in its switchability among four different operating states by injecting water or not into the water channels. When the container is empty, the structure acts as a polarization-intensive FSS with a -0.42 dB insertion loss passband at 3.75 GHz. When the horizontal channel is filled with water and there is no water in the vertical channel, this structure can be used as an FSR with single polarization selectivity. The FSR with -10 dB absorption band from 6.8 GHz to 18.8 GHz only allows certain polarized electromagnetic (EM) waves to pass at 3.1 GHz with an insertion loss of -0.78 dB, while another polarized EM wave cannot pass. When the container is full of water, the structure operates as an absorber with a reflection band below the absorption band, where neither of polarization EM waves can transmit. Besides, a reconfigurable water-based FSR automatic control system is built to achieve state switching and temperature constancy of the water within the container. Ultimately, a prototype of the presented design is fabricated, simulated and measured to verify the feasibility. This work has potential application in radome design to realize the out-of-band RCS reduction.
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