Sub-Wavelength Electromagnetic Imaging Method Based on a Novel Low Loss Left-Handed Material
|International Journal of Electrical and Electronics Engineering|
|© 2022 by SSRG - IJEEE Journal|
|Volume 9 Issue 2|
|Year of Publication : 2022|
|Authors : Jinyu Wang, Yaoliang Song|
How to Cite?
Jinyu Wang, Yaoliang Song, "Sub-Wavelength Electromagnetic Imaging Method Based on a Novel Low Loss Left-Handed Material," SSRG International Journal of Electrical and Electronics Engineering, vol. 9, no. 2, pp. 28-36, 2022. Crossref, https://doi.org/10.14445/23488379/IJEEE-V9I2P104
Negative refractive index materials have been proved to overcome the diffraction limit and realize sub-wavelength imaging, but the loss of materials will greatly limit the imaging quality. From the perspective of reducing loss, this paper designs a new left-handed (LH) material based on a nested split-ring resonator structure, which can be used for sub-wavelength imaging. The left-handed characteristic of this material is verified by effective constitutive parameter retrieval, and the loss characteristic is calculated by the figure of merit (FOM) coefficient. The transmission behaviours of propagating wave components and evanescent wave components in the lossy left-handed material during the imaging process are simulated, proving that the designed material can achieve very low loss left-handed characteristic around 9 GHz. As a result, the lens composed of a periodic arrangement of this left-handed structure can clearly distinguish two one-dimensional objects with sub-wavelength distance, thereby realizing super-resolution imaging around 9 GHz.
Negative refractive index materials, Left-handed materials, Sub-wavelength imaging, Low loss, Evanescent waves.
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