Patent ID: 6972646

Claim:
A filter circuit device comprising: a circuit part in which a plurality of circuit layers are stacked, each circuit layer including an insulating layer made of a dielectric insulating material and a wiring layer made of a pattern conductor; and a filter element in which a first set of parallel filter lines and a second set of parallel filter lines, are respectively provided in different ones of the circuit layers so that the two sets of filter lines are substantially parallel to each other in their longitudinal direction, the first filter line set and the second filter line set being electrically connected at one end; wherein, the first filter line set is formed by a thin film forming technique as a high-impedance line having a smaller thickness and a smaller width than the second filter line set and the second filter line set is formed as a low-impedance line by a thick film forming technique, and wherein a ground part is provided between the first filter line and the second filter line.