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Kebanyakan logam memiliki tetapan dielektrik (n 2 ) yang kompleks.Penjalaran gelombang permukaan pada perbatasan antara logamdan bahan dielektrik mengalami hambatan ohmik.Oleh sebab itu penjalaran akan mengalami atenuasi sepanjangsumbu-z.n ′ ′′ ′ ′′ ′ ′′2 2 22= n2− in2→ n2= n2− n2− i2n2n21/ 22 2⎛ n ⎞1n2ωβ = ⎜⎟ → β = β ′ − iβ′2 2⎝ n1+ n2⎠ c38

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