| 摘要 |
A directional coupler includes a laminate including a ground electrode substrate, a dielectric substrate that includes line electrodes thereon, a lead-out conductor substrate that includes lead-out conductors of the line electrodes, a ground electrode substrate, and a protection substrate. External electrodes for grounding, external electrodes for a main line, and external electrodes for a subordinate line are provided in the laminate. The inner line electrode and the outer line electrode preferably have a spiral or helical shape, and the corresponding currents are transmitted in the same direction through sections of these line electrodes that are adjacent and substantially parallel to each other.
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