We experimentally investigated the defect effects of LHMs when panel-allocated defects SRRs are introduced. By measuring the X-band transmission through metamaterial with different sizes and orientations panel-allocated defect SRRs, it was found that characters of resonant peak, including resonance frequency, magnitude and band pass, markedly change. And the panel-allocated defects in LHMs have more effect on electromagnetic behavior than that of dot and linear ones. It is thought that the existences of panel-allocated defects break the symmetry of perfect LHMs and result in a new electromagnetic resonance.
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