US 12,132,254 B2
Impedance matching film for radio wave absorber, impedance matching film-attached film for radio wave absorber, radio wave absorber, and laminate for radio wave absorber
Yosuke Nakanishi, Osaka (JP); Hironobu Machinaga, Osaka (JP); and Sho Shibahara, Osaka (JP)
Assigned to NITTO DENKO CORPORATION, Ibaraki (JP)
Appl. No. 17/599,327
Filed by NITTO DENKO CORPORATION, Ibaraki (JP)
PCT Filed Mar. 27, 2020, PCT No. PCT/JP2020/014414
§ 371(c)(1), (2) Date Sep. 28, 2021,
PCT Pub. No. WO2020/203942, PCT Pub. Date Oct. 8, 2020.
Claims priority of application No. 2019-067027 (JP), filed on Mar. 29, 2019.
Prior Publication US 2022/0190483 A1, Jun. 16, 2022
Int. Cl. H01Q 17/00 (2006.01); B32B 7/02 (2019.01); B32B 7/025 (2019.01); B32B 15/08 (2006.01)
CPC H01Q 17/007 (2013.01) [B32B 7/025 (2019.01); B32B 15/08 (2013.01); B32B 2250/04 (2013.01); B32B 2255/10 (2013.01); B32B 2255/205 (2013.01); B32B 2307/202 (2013.01); B32B 2307/204 (2013.01); B32B 2307/732 (2013.01); B32B 2457/00 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An impedance matching film for a radio wave absorber, comprising:
a metallic element; and
a non-metallic element, wherein
the impedance matching film is a singular layer made of a mixture containing the metallic element and the non-metallic element,
the impedance matching film has a thickness of 10 to 200 nm,
the impedance matching film has a sheet resistance of 200 Ω/□ or more,
a content of an oxygen atom is less than 50% in terms of the number of atoms,
the metallic element is at least one element selected from the group consisting of Ni, Cr, Mo, and Ti, and
a total content of Ni, Cr, Mo, and Ti is 10% or more in terms of the number of atoms.