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期刊论文 2

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2021 1

2020 1

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对跖Vivaldi天线；超宽带；高介电常数；双极化；超表面透镜 1

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Investigation of Generalized SIFs of cracks in 3D piezoelectric media under various crack-face conditions

Jaroon RUNGAMORNRAT, Bounsana CHANSAVANG, Weeraporn PHONGTINNABOOT, Chung Nguyen VAN

《结构与土木工程前沿（英文）》 2020年 第14卷 第2期   页码 280-298 doi: 10.1007/s11709-019-0586-7

摘要： This paper investigates the influence of crack geometry, crack-face and loading conditions, and the permittivity of a medium inside the crack gap on intensity factors of planar and non-planar cracks in linear piezoelectric media. A weakly singular boundary integral equation method together with the near-front approximation is adopted to accurately determine the intensity factors. Obtained results indicate that the non-flat crack surface, the electric field, and the permittivity of a medium inside the crack gap play a crucial role on the behavior of intensity factors. The mode-I stress intensity factors ( ) for two representative non-planar cracks under different crack-face conditions are found significantly different and they possess both upper and lower bounds. In addition, for impermeable and semi-permeable non-planar cracks treated depends strongly on the electric field whereas those of impermeable, permeable, and semi-permeable penny-shaped cracks are identical and independent of the electric field. The stress/electric intensity factors predicted by permeable and energetically consistent models are, respectively, independent of and dependent on the electric field for the penny-shaped crack and the two representative non-planar cracks. Also, the permittivity of a medium inside the crack gap strongly affects the intensity factors for all crack configurations considered except for of the semi-permeable penny-shaped crack.

关键词： crack-face conditions     intensity factors     non-flat cracks     permittivity     piezoelectric media     SGBEM    

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基于高介电常数超表面透镜调制的性能增强对跖Vivaldi天线 Research Article

潘少鹏1,林铭团2,亓琳1,陈攀1,冯杨1,李高升1

《信息与电子工程前沿（英文）》 2021年 第22卷 第12期   页码 1551-1684 doi: 10.1631/FITEE.2100139

摘要： 设计了工作频段为2～20 GHz的超表面单元以增强对跖Vivaldi天线的增益和辐射性能。设计的超表面单元结构简单、超宽带性能稳定、介电常数高，可独立调制两个极化电磁波。分析了单元上的电流分布，并提取等效电磁参数，以验证超表面单元对x极化电磁波和y极化电磁波进行独立调制的能力。设计的超表面单元被集成到对跖Vivaldi天线的口径中形成超表面透镜，用于引导电磁波传播。提出两种超表面透镜，将它们分别集成到对跖Vivaldi天线中衍生出天线Ant1和Ant2，并从电场幅度和相位角度分析透镜对电磁波的调制作用，进而得到最终设计方案。根据优化设计结果，加工并测试对跖Vivaldi天线和提出的天线Ant2，测试与仿真结果吻合良好。Ant2测得的阻抗带宽基本覆盖2～18 GHz频段，与传统对跖Vivaldi天线相比，提出的天线Ant2增益提高0.6～3.7 dB，副瓣电平大大降低，方向性也得到明显改善。

关键词： 对跖Vivaldi天线；超宽带；高介电常数；双极化；超表面透镜    

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标题 作者 时间 类型 操作

Investigation of Generalized SIFs of cracks in 3D piezoelectric media under various crack-face conditions

Jaroon RUNGAMORNRAT, Bounsana CHANSAVANG, Weeraporn PHONGTINNABOOT, Chung Nguyen VAN

期刊论文

基于高介电常数超表面透镜调制的性能增强对跖Vivaldi天线

潘少鹏1,林铭团2,亓琳1,陈攀1,冯杨1,李高升1

期刊论文