Abstract: A filter inductor assembly is provided. The filter inductor assembly of this invention comprises a magnetic body and a coil. The magnetic body has an even number of winding sections. The winding sections comprise a first section and a second section, while the second section is adjacent to the first section. The first coil is wound onto the first section on a surface of the magnetic body in a first direction, while the second coil is wound onto the second section on the surface of the magnetic body in a second direction, wherein the first direction is substantially opposite to the second direction. By using an even number of winding sections, the impedance frequency bandwidth of each winding section of the coil is increased.