Patent ID: 7023299

Claim:
A thin-film common mode filter comprising: a pair of magnetic plates; an upper coil conductor and a lower coil conductor formed between said pair of magnetic plates, spirally wound in said magnetic plates surface direction, and overlapped each other; an upper lead conductor and a lower lead conductor, one ends of said upper lead conductor and said lower lead conductor connected electrically to one ends in center portions of said upper coil conductor and said lower coil conductor, respectively, and extended to external portions across said upper coil conductor and said lower coil conductor; an upper lead drawing terminal and a lower lead drawing terminal, the other ends of said upper lead conductor and said lower lead conductor connected to said upper lead drawing terminal and said lower lead drawing terminal, respectively; an upper coil drawing terminal and a lower coil drawing terminal, the other ends of said upper coil conductor and said lower coil conductor connected to said upper coil drawing terminal and said lower coil drawing terminal, respectively; and each of said lower lead drawing terminal, said lower coil drawing terminal, said upper coil drawing terminal and said upper lead drawing terminal having a structure where at least two of conductor layers to be patterned into said lower lead conductor, said lower coil conductor, said upper coil conductor and said upper lead conductor are stacked, and brought into conduction with each other.