Provided is a coupler including a first assembly of an input unit element, an intermediate unit element, and an output unit element. Each unit element includes a first coil and a second coil arranged in a cross having a general “H” shape. A first input terminal and a second input terminal of the intermediate unit element are coupled to a first output terminal and to a second output terminal of the input unit element, a first output terminal and a second output terminal of the intermediate unit element are coupled to a first input terminal and to a second input terminal of the output unit element, and the input unit element is spatially positioned between the intermediate unit element and the output unit element.