Patent ID: 6903643

Claim:
A laminated balun transformer, comprising: a first dielectric sheet on a surface of which a first strip line is provided; a second dielectric sheet on a surface of which a second strip line electro-magnetically coupled to the first strip line is provided; a third dielectric sheet on a surface of which a ground electrode is provided; a fourth dielectric sheet on a surface of which a third strip line is provided; an unbalanced signal electrode through which an unbalanced signal is to be input or output; and first and second balanced signal electrodes through which balanced signals are to be input or output; wherein the first strip line is connected to the ground electrode at one end thereof and connected to the unbalanced signal electrode at the other end thereof; and the second and third strip lines have respective first ends connected to each other and respective second ends connected to the first and second balanced signal electrodes, respectively.