Abstract: The present invention provides a coil filter suitable for surface mounting on an electronic circuit board by automatic mounting and capable of realizing wide band isolation excellent in high-frequency characteristics without requiring consideration for the mutual position of parts. The coil filter functions to block electromagnetic waves or high-frequency signals propagating while being superimposed on a DC power supply, signal, or the like of an electronic apparatus such as an electronic circuit board. Conducting wires are bonded electrically at coil end parts such that a conducting wire part wound by one turn or more constitutes a short ring conducting in a ring shape on both sides of an intermediate part in which electrically insulated conducting wires are wound. End parts of the conducting wire are positioned on the inner side of the outermost circumferential part of the coil-shaped end faces.

Abstract: The present invention provides a coil filter suitable for surface mounting on an electronic circuit board by automatic mounting and capable of realizing wide band isolation excellent in high-frequency characteristics without requiring consideration for the mutual position of parts. The coil filter functions to block electromagnetic waves or high-frequency signals propagating while being superimposed on a DC power supply, signal, or the like of an electronic apparatus such as an electronic circuit board. Conducting wires are bonded electrically at coil end parts such that a conducting wire part wound by one turn or more constitutes a short ring conducting in a ring shape on both sides of an intermediate part in which electrically insulated conducting wires are wound. End parts of the conducting wire are positioned on the inner side of the outermost circumferential part of the coil-shaped end faces.

Abstract: A choke coil is provided with a coil formed of a conducting wire covered by an insulating coating and wound in a coil shape; a conducting ring provided one on both ends of the coil; and a bar-shaped core formed of ferrite, ceramic, or the like and penetrating the coil. The ring has a prescribed width and has a centerline extending in the axial direction of the core.

Abstract: A choke coil is provided with a coil formed of a conducting wire covered by an insulating coating and wound in a coil shape; a conducting ring provided one on both ends of the coil; and a bar-shaped core formed of ferrite, ceramic, or the like and penetrating the coil. The ring has a prescribed width and has a centerline extending in the axial direction of the core.