Patent ID: 7355493

Claim:
A filter element comprising: a coil part having a generally tubular shape comprising a layered pair of generally belt-shape signal transmitting conductors and a generally belt-shape grounding conductor with a generally belt-shape insulator in between and wound so that the belt-shape grounding conductor is outside the pair of belt-shape signal transmitting conductors; a magnetic body being attached to a center of the coil part; a pair of input terminals that are connected to respective outermost circumferential parts of the pair of belt-shape signal transmitting conductors and are respectively led from outer circumferential positions of the coil part; a pair of output terminals that are connected to respective innermost circumferential parts of the pair of belt-shape signal transmitting conductors and are respectively led from central positions of the coil part located on an opposite side to lead positions of the pair of input terminals with the magnetic body in between; and a grounding terminal that is connected to an outermost circumferential part of the belt-shape grounding conductor and is led from an outer circumferential position of the coil part located on an opposite side to the lead positions of the pair of input terminals with lead positions of the pair of output terminals in between, thereby providing superior attenuation characteristics.