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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 (1μm)/CoFeB (1μm)/polyimide (1μm)] sandwich between upper Cu coupled lines (3μm thick and 12μm wide) and a lower Cu ground plane (3μm). 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.

Large-Signal Transmission Characteristics of a CoFeB Magnetic Thin Film Directional Coupler for Cellular Phones