| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology for reducing a directional coupler in size. SOLUTION: A directional coupler 10 comprises a wiring board having a plurality of stacked insulating layers and a plurality of wiring layers wired in a specified pattern on the surface of respective insulating layers, a main line (first wiring) 11 that is formed in a single wiring layer among the plurality of wiring layers, and a sub line (second wiring) 12 which is formed across the plurality of wiring layers and comprises extensions 13a, 13b and 13c extending along the main line 11. The main line 11 comprises no bent part while the sub line 12 is formed to form a coil-like loop on one side surface side of the main line 11. COPYRIGHT: (C)2009,JPO&INPIT
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