Patent ID: 8791770
Filing Date: 2014-07-29
Classification: H01P

Abstract:
1. A directional coupler comprising: a laminated body including a plurality of insulator layers that are laminated to one another and a mounting surface parallel or substantially parallel to a lamination direction of the plurality of insulator layers; and a main line and a sub-line embedded in the laminated body, the main line including a first spiral-shaped portion and the sub-line including a second spiral-shaped portion having central axes parallel or substantially parallel to the lamination direction, and the main line and the sub-line being electromagnetically coupled to each other; wherein the main line and the sub-line have substantially the same shapes and are provided within regions coinciding or substantially coinciding with each other in a direction perpendicular or substantially perpendicular to the mounting surface; the first spiral-shaped portion includes a plurality of first signal conductors disposed on at least two of the plurality of insulator layers; the second spiral-shaped portion includes a plurality of second signal conductors disposed on at least two of the plurality of insulator layers; and at least a portion of the first spiral-shaped portion of the main line and at least a portion of the second spiral-shaped portion of the sub-line are disposed on at least one common insulator layer of the plurality of insulator layers.