COIL FILTER AND METHOD FOR MANUFACTURING THE SAME

摘要

A coil filter suitable for automatic surface mounting on an electronic circuit board and realizing a wide band isolation excellent in high frequency characteristics without requiring a significant consideration of the mutual arrangement of parts. In the filter for blocking an electromagnetic wave or a high frequency signal propagating while being superposed on the DC power supply or the signal of an electronic apparatus, e.g. an electronic circuit board, conductor wires are bonded electrically at the coil end part such that the conductor wire part wound by one turn or more constitutes a short ring (1b) conducting in ring shape on the opposite sides of an intermediate part (1a) where electrically insulated conductor wires are coiled and the end part (1c) of the conductor wire is located on the inner side of the outermost circumferential part of the coil−shaped end face.