	US 12,250,801 B2
	Electromagnetic wave-absorbing composite material comprising conductive wire and manufacturing method therefor
Byeong Jin Park, Changwon-si (KR); Tae Hoon Kim, Changwon-si (KR); Sang Bok Lee, Changwon-si (KR); Byung Mun Jung, Changwon-si (KR); Seung Han Ryu, Changwon-si (KR); Yu Kyung Han, Changwon-si (KR); and Suk Jin Kwon, Changwon-si (KR)
Assigned to KOREA INSTITUTE OF MATERIALS SCIENCE, Changwon-si (KR)
Appl. No. 18/284,720
Filed by KOREA INSTITUTE OF MATERIALS SCIENCE, Changwon-si (KR)
PCT Filed Aug. 2, 2022, PCT No. PCT/KR2022/011360 § 371(c)(1), (2) Date Sep. 28, 2023, PCT Pub. No. WO2023/027367, PCT Pub. Date Mar. 2, 2023.
Claims priority of application No. 10-2021-0111859 (KR), filed on Aug. 24, 2021.
Prior Publication US 2024/0196581 A1, Jun. 13, 2024
Int. Cl. H05K 9/00 (2006.01); H01Q 17/00 (2006.01)

CPC H05K 9/009 (2013.01) [H01Q 17/005 (2013.01)]

18 Claims

1. An electromagnetic wave-absorbing composite material, comprising:

a polymer composite including a refractive index-adjusting material therein; and

a plurality of conductive wires which are formed on at least one surface of the polymer composite,

wherein electromagnetic waves reflected in a matching frequency (f) range derived through Mathematical Formulas 1 to 3 below are 0.2 dB or less:

wherein the lower limit of f is 15, and the upper limit thereof is a frequency of 80,

D_effis the effective spacing of conductive wires represented by Mathematical Formula 2 below,

N_effis 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,

D_eff=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,

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.