| 摘要 |
A wirewound balun transformer for planar packaging comprises a flanged core (12) which has end flanges (13,14) at both ends, at least one centre flange (15), and two or more winding recesses (17,18). A flat core (16) is held in parallel with the flanged core (12), and windings (8,9,10,11) are coiled around the winding recesses (17,18). One side face (19) of the centre flange (15) is not flush with but is formed behind the plane that connects one side faces (20,21) on the same side of the end flanges (13,14). Each of the end flanges (13,14) of the flanged core (12) has an opposing pair of electrodes (7) formed on both side faces (20, 20', 21, 21'). The centre flange (15) has a single electrode (7) formed on the opposite side face (19'). <IMAGE> |
