| 摘要 |
The invention provides couplers that are thinner and smaller in size and still satisfy the required various properties of the couplers. According to an embodiment of the invention, a coupler has a first line L1 that includes a coiled main line L11 and is constituted by separate portions arranged in different layers; a second line L2 that includes a coiled secondary line L21 arranged to be opposed to the main line L11 via an insulating layer, the second line being constituted by separate portions arranged in different layers; a plurality of vias P11, P12, P21 and P22 that connect the separate portions of the first line arranged in the different layers to each other and connect the separate portions of the second line arranged in the different layers to each other; and a plurality of terminals T11, T12, T21 and T22 each connected to an end of the first and second lines L1 and L2. The vias include an extension via P11 connected to the main line or the secondary line and extending through the insulating layer, and the extension via P11 wires out at least one of the first line L1 and the second line L2 to the same side of the insulating layer as the other one of the first line L1 and the second line L2.
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