Patent ID: 8525614

Claim:
A coupler comprising: a first line that includes a coiled main line and is constituted by separate portions arranged in different layers; a second line that includes a coiled secondary line arranged to be opposed to the main line via an insulating layer, the second line being constituted by separate portions arranged in different layers; a plurality of vias connecting the separate portions of the first line arranged in the different layers to each other and connecting the separate portions of the second line arranged in the different layers to each other; and a plurality of terminals each connected to an end of the first and second lines, wherein: all the terminals are arranged on a periphery. along a same planar surface, and separate from the coiled main line and the coiled secondary line, the vias include an extension via connected to the main line or the secondary line and extending through the insulating layer, and the extension via wires the first line to the insulating layer on a same side as the second line, and the extension via wires the second line to the insulating layer on a same side as the first line.