| CPC H01P 5/18 (2013.01) | 10 Claims |
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1. A directional coupler, comprising:
a substrate comprising a plurality of dielectric layers;
a main line in the substrate;
a first sub-line in or on the substrate; and
a ground conductor in or on the substrate, wherein:
the main line comprises a first conductor line and a second conductor line that are electrically connected to each other,
the first sub-line comprises a third conductor line,
the first conductor line and the second conductor line are electromagnetically coupled to the third conductor line,
the first conductor line and the second conductor line are in different layers of the substrate,
when the substrate is view in cross section, the first conductor line is between the third conductor line and the second conductor line, and the second conductor line is between the first conductor line and the ground conductor,
the first conductor line has a first edge and a second edge that extend in a longitudinal direction and are on opposite sides,
the second conductor line has a third edge and a fourth edge that extend in a longitudinal direction and are on opposite sides,
the third conductor line has a fifth edge and a sixth edge that extend in a longitudinal direction and are on opposite sides, and
when the substrate is viewed in plan view, the fifth edge is between the first edge and the third edge, the third edge is between the fifth edge and the second edge, the second edge is between the third edge and the sixth edge, and the sixth edge is between the second edge and the fourth edge.
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