US Patent No. 10,716,247


Patent No. 10,716,247
Issue Date July 14, 2020
Title Electromagnetic Absorber
Inventorship Masao Fujita, Kyoto (JP)
Toshio Hiroi, Kyoto (JP)
Assignee MAXELL HOLDINGS, LTD., Kyoto (JP)

Claim of US Patent No. 10,716,247

1. An electromagnetic-wave absorber comprising an electromagnetic-wave absorbing layer in which a plurality of magnetic layers are stacked, each magnetic layer containing magnetic iron oxide that magnetically resonates at a high frequency in a band equal to or higher than a millimeter-wave band,wherein in each of the magnetic layers, the magnetic iron oxide in a particulate form is dispersed in a resin binder, and
a value of an anisotropic magnetic field (HA) of the magnetic iron oxide contained in at least one of the magnetic layers is different from that of the magnetic iron oxide contained in another of the magnetic layers.