US 11,888,226 B2
Radar-absorbing material having honeycomb sandwich structure and stealth structure using same
Young Woo Nam, Jinju-si (KR); Byeong Su Kwak, Busan (KR); Jin Ho Choi, Jinju-si (KR); and Jin Hwe Kweon, Jinju-si (KR)
Assigned to INDUSTRY-ACADEMIC COOPERATION FOUNDATION GYEONGSANG NATIONAL UNIVERSITY, Jinju-si (KR)
Appl. No. 17/780,557
Filed by INDUSTRY-ACADEMIC COOPERATION FOUNDATION GYEONGSANG NATIONAL UNIVERSITY, Jinju-si (KR)
PCT Filed Aug. 26, 2020, PCT No. PCT/KR2020/011356
§ 371(c)(1), (2) Date May 27, 2022,
PCT Pub. No. WO2021/107339, PCT Pub. Date Jun. 3, 2021.
Claims priority of application No. 10-2019-0154876 (KR), filed on Nov. 27, 2019.
Prior Publication US 2023/0136149 A1, May 4, 2023
Int. Cl. H01Q 17/00 (2006.01); B32B 3/12 (2006.01); B32B 5/02 (2006.01); B32B 5/26 (2006.01); B64D 7/00 (2006.01); B32B 7/12 (2006.01)
CPC H01Q 17/008 (2013.01) [B32B 3/12 (2013.01); B32B 5/02 (2013.01); B32B 5/26 (2013.01); B32B 7/12 (2013.01); B64D 7/00 (2013.01); B32B 2260/023 (2013.01); B32B 2260/046 (2013.01); B32B 2262/101 (2013.01); B32B 2262/12 (2013.01); B32B 2305/024 (2013.01); B32B 2307/206 (2013.01); B32B 2605/18 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An electromagnetic wave absorber having a honeycomb sandwich structure, which is capable of absorbing broadband electromagnetic waves using electromagnetic properties of a metal-coated glass fiber, the electromagnetic wave absorber comprising:
at least two honeycomb core layers in each of which hexagonal units formed of a material comprising the metal-coated glass fiber are continuously arranged; and
skin layers which are disposed on top surfaces and bottom surfaces of the at least two honeycomb core layers, the skin layers including a bottom layer, a top layer, and an intermediate layer;
wherein the honeycomb core layers are formed of a first electromagnetic wave absorbing layer formed by impregnating a nickel-coated second glass fiber having a complex permittivity of 11.23−j21.86 at 10 GHz with an epoxy resin,
wherein the bottom layer and top layer contain at least one sheet layer formed by impregnating a glass fiber with the epoxy resin, and the intermediate layer contains a sheet layer formed by impregnating the glass fiber with the epoxy resin and a plurality of second electromagnetic wave absorbing layers formed by impregnating a nickel-coated first glass fiber having a complex permittivity of 8.06−j12.68 at 10 GHz with the epoxy resin.