携帯電話用CoFeB磁性薄膜方向性結合器の大振幅信号伝送特性(計測・高周波デバイス)

概要

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A directional coupler using a CoFeB magnetic/polyimide dielectric hybrid transmission line was fabricated and evaluated under a large-signal transmission condition from 0.5 to 2 W. The device consists of a [polyimide (1 μm)/CoFeB (1 μm)/polyimide (1 μm)] sandwich between upper Cu coupled lines (3 μm thick and 12 μm wide) and a lower Cu ground plane (3 μm). The electromagnetic coupling between the top main line and the sub-line is composed of the electric field coupling due to the stub capacitors and the magnetic field coupling through the inner magnetic film. The fabricated CoFeB magnetic thin film directional coupler exhibited excellent large-signal transmission characteristics even at a rating power of 2 W in a real cellular phone application. In addition, such a large-signal characteristic was acceptable for a wideband frequency of 0.8 to 2.4 GHz, which was mainly due to the non-resonance operation.
社団法人日本磁気学会の論文
2008-05-01