“attenuation constant(symbol: α)”的概念、定义、翻译、参考文献-科学参考

单词	attenuation constant(symbol: α)
释义	attenuation constant(symbol: α) Electronics and Electrical Engineering The rate of exponential decrease in amplitude of voltage, current, or field-component in the direction of propagation of a plane progressive wave, at a given frequency. If I₂ and I₁ are the currents at two points a distance d apart (I₁ being nearer the source of the wave), then $I_{2} = I_{1} exp (- α d)$ α is usually expressed in nepers or decibels.
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