| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a directional coupler that allows easy and relatively-inexpensive adjustment of a degree of coupling. Ž<P>SOLUTION: A coupling part 22 in three-staged coupling parts 21, 22 and 23 is formed in a substrate 200 different from a substrate 100. Then, the substrate 200 is mounted onto a coupling-part 21, 23 forming face of the substrate 100. When adjusting a degree of coupling, the substrate 200 is replaced with a new substrate without replacing the substrate 100 itself. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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