| 摘要 |
PURPOSE:To improve pass frequency band width by forming a primary coil by a wire rod having an insulating coating and a large diameter and forming secondary coils by two wire rods having small diameters and insulating coatings adjacent to both sides of the primary coil in parallel. CONSTITUTION:An impedance converting transformer consists of a magnetic core and a primary coil and secondary coils wound on said magnetic core. The primary coil is composed of a copper wire 2 and an insulating coating 5, and made of a wire rod having a comparatively large diameter. The secondary coils consist of copper wires 1, 3 and insulating coatings 4, 6. These coils are arranged adjacently in parallel with both sides of the wire rod for the primary coil. These secondary coils are formed in relatively small diameters. When these coils are wound on the magnetic core 40' and connected as shown in the figure, the lowering of the resonance frequency of the primary coils 10, 30 is inhibited, and pass band width and coupling loss can be improved.
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