Symmetrical eight-shaped balun (BALanced-to-UNbalanced converter) comprising a first and second eye (A, B), each eye comprising conducting tracks (10, 11) forming turns. The eyes (A, B) comprise an equal number of primary turns (11) which form a first conducting path from a first terminal (22) to a second terminal (21), in which in operation an electrical current flows in a first direction in a first eye and in a second direction in a second eye. Moreover, the eyes (A, B) further comprise an equal number of secondary turns (10) which form a second conducting path from a third terminal (16) to a fourth terminal (19), in which in operation an electrical current flows in a first direction in a first eye and in a second direction in a second eye. The geometrical and electrical middle points (13) of primary and secondary turns are all superposed and further are located in the same plane.