A coupler includes a first and second coupler element, with a respective first and second transmission element. In an embodiment, a first signal contact for connection to a signal conductor is arranged on a first end of the first transmission element; a second signal contact for connection to a signal conductor is arranged on a first end of the second transmission element; the first transmission element forms a plurality of first U-shaped curves between the first end and a second end; and the second transmission element forms a plurality of second U-shaped curves between the first end and a second end. The first transmission element is configured, in operation, to transmit a signal supplied at the first signal contact to the second transmission element via directional coupling and the second transmission element is configured, in operation, to receive and output the signal via the second signal contact.