Patent ID: 9510490
Filing Date: 2016-11-29
CPC Classification: H01L,H05K

Claim Text:
1. An electronic device comprising: a wiring board; a first electronic component which is mounted on the wiring board and emits an electromagnetic wave having a first frequency band; a second electronic component which is mounted on the wiring board and emits an electromagnetic wave having a second frequency band; a first magnetic thin film covering the wiring board, the first electronic component and the second electronic component, wherein the first magnetic thin film has a composition corresponding to the first frequency band and is a Mn—Zn ferrite film; and a second magnetic thin film covering the first magnetic thin film, wherein the second magnetic thin film has a composition corresponding to the second frequency band and is a Ni—Zn ferrite film, wherein a resonance frequency of the Mn—Zn ferrite film is smaller than that of the Ni—Zn ferrite film, wherein a resistivity of the first magnetic thin film is larger than that of the second magnetic thin film, wherein the first frequency band is different from the second frequency band, wherein the first magnetic thin film shields or attenuates the electromagnetic wave having the first frequency band, and the second magnetic thin film shields or attenuates the electromagnetic wave having the second frequency band.