公开(公告)号：US09793608B2

公开(公告)日：2017-10-17

申请号：US14555159

申请日：2014-11-26

Applicant: TDK CORPORATION

Inventor： Tomokazu Ishikura ,  Shin Takane ,  Norizumi Asano ,  Kosuke Kunitsuka

IPC: H01Q7/06 ,  H01Q7/08 ,  C02F1/46 ,  H01Q1/22 ,  H01F1/34 ,  G06K19/077 ,  C04B35/26 ,  C04B35/638

CPC classification number: H01Q7/06 ,  C04B35/26 ,  C04B35/638 ,  C04B2235/3232 ,  C04B2235/3277 ,  C04B2235/3279 ,  C04B2235/3281 ,  C04B2235/3284 ,  C04B2235/6562 ,  C04B2235/72 ,  G06K19/07771 ,  H01F1/344 ,  H01Q1/2225

Abstract: An object is to provide a ferrite composition suitable for an antenna element with a long communication distance in a high-frequency band (for example, 13.56 MHz), a ferrite plate formed of the ferrite composition, a magnetic member for an antenna element formed of the ferrite plate, and an antenna element provided with a member for an antenna element. A ferrite composition, wherein: main components contain, with Fe2O3 conversion, 45.0-49.5 mol % of iron oxide, with CuO conversion, 4.0-16.0 mol % of copper oxide, with ZnO conversion, 19.0-25.0 mol % of zinc oxide, a remaining portion is constituted by nickel oxide, an inevitable impurity is removed with respect to the main components, and as accessory components, with TiO2 conversion, 0.5-2 weight % of titanium oxide, with CoO conversion, 0.35-2 weight % of cobalt oxide are contained.