Electromagnetic wave-absorbing composite material comprising conductive wire and manufacturing method therefor

A method for manufacturing an electromagnetic wave-absorbing composite material, comprising the steps of:

• (1) preparing a polymer composite including a refractive index-adjusting material therein;
• and
• (2) forming a conductive wire on the polymer composite,
• wherein the average refractive index and thickness of the polymer composite and the line width and spacing of the conductive wires are controlled such that electromagnetic waves reflected in a matching frequency (f) range derived through Mathematical Formulas 1 to 3 below are 0.2 dB or less:
• 0
• .
• 6
• ⁢
• 7
• ⁢
• D
• eff
• n
• eff
• ⁢
• c
• ≤
• f
• (
• GHz
• )
• ≤
• 0
• .
• 8
• ⁢
• 3
• ⁢
• D
• eff
• n
• eff
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• c
• [
• Mathematical
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• Formula
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• 1
• ]
• wherein the lower limit of f is 15, and the upper limit thereof is a frequency of 80,
• Deff is the effective spacing of conductive wires represented by Mathematical Formula 2 below,
• Neff is the effective refractive index of an electromagnetic wave-shielding composite material represented by Mathematical Formula 3 below, and
• c is the speed of light in free space,
• Deff=1.53 exp(0.23(D−a)) [Mathematical Formula 2]
• wherein D is the average spacing of the conductive wires, and
• a is the average line width of the conductive wires,
• n
• eff
• =
• 1
• -
• n
• 2
• -
• 1
• n
• 2
• ⁢
• exp
• ⁢
• (
• -
• 1
• ⁢
• 8
• ⁢
• d
• D
• )
• ⁢
• n
• [
• Mathematical
• ⁢
• Formula
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• 3
• ]
• wherein n is the average refractive index of the polymer composite,
• D is the average spacing of the conductive wires, and
• d is the thickness of the polymer composite.