超材料
超透镜
镜头(地质)
光学
微波食品加热
折射率
材料科学
超材料吸收剂
变换光学
分裂环谐振器
超材料天线
衍射
光电子学
可调谐超材料
物理
计算机科学
电信
定向天线
缝隙天线
量子力学
天线(收音机)
作者
Srijan Datta,Saptarshi Mukherjee,Xiaodong Shi,Muhammad Zia Ul Haq,Yiming Deng,Лалита Удпа,Edward J. Rothwell
出处
期刊:Sensors
[MDPI AG]
日期:2021-07-13
卷期号:21 (14): 4782-4782
被引量:9
摘要
Metamaterials are engineered periodic structures designed to have unique properties not encountered in naturally occurring materials. One such unusual property of metamaterials is the ability to exhibit negative refractive index over a prescribed range of frequencies. A lens made of negative refractive index metamaterials can achieve resolution beyond the diffraction limit. This paper presents the design of a metamaterial lens and its use in far-field microwave imaging for subwavelength defect detection in nondestructive evaluation (NDE). Theoretical formulation and numerical studies of the metamaterial lens design are presented followed by experimental demonstration and characterization of metamaterial behavior. Finally, a microwave homodyne receiver-based system is used in conjunction with the metamaterial lens to develop a far-field microwave NDE sensor system. A subwavelength focal spot of size 0.82λ was obtained. The system is shown to be sensitive to a defect of size 0.17λ × 0.06λ in a Teflon sample. Consecutive positions of the defect with a separation of 0.23λ was resolvable using the proposed system.
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