Eight-shaped RF balun

A wireless communication device, comprising:

• one or more of a transmitter or receiver circuit operative to convert a signal to be transmitted or a received signal, respectively between a single-ended signal and a differential signal, the transmitter or receiver circuit including a balun to perform the conversion, the balun comprising first and second electrically conductive tracks, the tracks shaped into turns forming a first eye and a second eye;
• wherein the first conductive track of the balun includes an equal number of turns in each of the first and second eyes, and wherein in operation an electrical current flows through the first track in a first direction in the first eye and in a second direction in the second eye, and wherein the first conductive track forms a first conducting path from a first terminal to a second terminal;
• wherein the second conductive track of the balun includes an equal number of turns in each of the first and second eyes, and wherein in operation an electrical current flows through the second track in a first direction in the first eye and in a second direction in the second eye, and wherein the second conductive track forms a second conducting path from a third terminal to a fourth terminal;
• wherein at least one of the first and second conductive tracks of the balun forms successive turns alternately in the first and second eyes;
• and
• wherein geometrical and electrical middle points of first and second conductive tracks of the balun are all superposed and are located in the same plane in the balun.