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Comment on "Superwide-band negative refraction of a symmetrical E-shaped metamaterial with two electromagnetic resonances"

: Paul, O.; Beigang, R.; Rahm, M.


Physical Review. E 81 (2010), No.4, Art. 048601, 2 pp.
ISSN: 1063-651X
ISSN: 1539-3755
Journal Article
Fraunhofer IPM ()

The metamaterial presented by Yan [Phys. Rev. E 77, 056604 (2008)] is claimed to exhibit a superwide band of negative refraction. However, a retrieval procedure of the refractive index including the phase advance of a propagating plane wave shows that the material provides two distinct narrow bands with a negative refractive index instead of a single superwide band and thus the central claim of the paper is incorrect.