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首页> 外文期刊>International journal of RF and microwave computer-aided engineering >Broadband linear-cross and circular-circular polarizers with minimal bandwidth reduction at higher oblique angles for RCS applications
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Broadband linear-cross and circular-circular polarizers with minimal bandwidth reduction at higher oblique angles for RCS applications

机译：宽带线性交叉和圆形偏振器，具有较小的RCS应用的倾斜角度最小的带宽降低

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摘要

In this work, broadband linear to cross and circular to circular polarizationconverter for K and Ka-band applications is proposed. The metasurface comprisesa novel H-shaped unit cell printed on 1.2 mm thin FR-4 groundeddielectric substrate. It exhibits 90% polarization conversion ratio (PCR) over abandwidth of 22.26 GHz (17.97-40.23 GHz) with 76.5% FBW maintaining aminimal PCR of 92.5%. The converter also maintains handedness for circularlypolarized incident wave. Surface current distributions at different resonant frequenciesare analyzed to illustrate the reason behind the broadband behavior.The converter design is simple with the cell periodicity of 0.209λ_0 and thicknessof 0.071λ_0, where λ_0 is the free-space wavelength corresponding to thelowest frequency of the band. Monostatic and Bistatic RCS analysis of thedesigned converter is performed, demonstrating greater than 10 dBsm RCSreduction over all the frequency range. It shows ～16 to 30 dBsm at resonantpeaks in comparison with PEC. To the best of the authors' knowledge, the proposedstructure shows broadband response with angular stability up to 40° forboth TE and TM with less bandwidth reduction (up to 30%) at higher obliqueangles without compromising the compactness and performance of the cell.
机译：在这项工作中，宽带线性交叉和圆形极化提出了K和KA波段应用的转换器。元质面包括一种新的H形单元电池，印在1.2毫米薄FR-4接地介电基板。它表现出90％的极化转换比（PCR）22.26 GHz的带宽（17.97-40.23 GHz），拥有76.5％FBW维护A.最小PCR为92.5％。转换器还保持圆形的圆形极化的入射波。不同谐振频率下的表面电流分布分析以说明宽带行为背后的原因。转换器设计简单，电池周期为0.209λ_0和厚度0.071λ_0，其中λ_0是对应的自由空间波长频段的最低频率。单体和双晶RCS分析设计了转换器，演示大于10 dbsm rcs减少所有频率范围。它显示谐振〜16至30 dbsm与PEC相比的峰值。据提议，据作者所知，提出的结构显示宽带响应，角度稳定可达40°TE和TM都具有较少的带宽（高达30％）在更高的斜角度而不会影响细胞的紧凑性和性能。

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