This paper describes the design of a subwavelength microwave imaging system using a negative index metamaterial (NIM) lens for nondestructive evaluation (NDE) applications. The imaging system consists of a split ring resonator (SRR)-wire based NIM lens, operating at 6.3 GHz, used in conjunction with a homodyne detection system. Simulation studies of the unit cell design are presented followed by experimental verification of left-handed focusing by the NIM lens with a focal spot of size 0.65λ. A subwavelength hole of diameter 0.25λ in a glass fiber reinforced polymer (GFRP) sample is imaged at a stand-off distance of 1.67λ using the proposed system. High SNR and preservation of polarity and phase information associated with synchronous detection provides a NIM lens imaging system that can be used in the field for rapid inspection at large standoff distances.
 Pendry, J. B. (2000). Negative refraction makes a perfect lens. Physical Review Letters, 85(18).
 Smith, D. R., Padilla, W. J., Vier, D. C., Nemat-Nasser, S. C., & Schultz, S. (2000). Composite Medium with Simultaneously Negative Permeability and Permittivity. Physical Review Letters, 84(18), 4184–4187.
 Noll, D. C., Nishimura, D. G., & Macovski, A. (1991). Homodyne Detection in Magnetic Resonance Imaging. IEEE Transactions on Medical Imaging, 10(2), 154–163.
 Datta, S., Shi, X., Mukherjee, S., Deng, Y., & Udpa, L. (2020). Model-Based Study of a Metamaterial Lens for Nondestructive Evaluation of Composites. Journal of Nondestructive Evaluation, Diagnostics and Prognostics of Engineering Systems, 3(4).
 Datta, S., Mukherjee, S., Shi, X., Haq, M., Deng, Y., Udpa, L., & Rothwell, E. (2021). Negative index metamaterial lens for subwavelength microwave detection. Sensors, 21(14), 1–16.
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