| 摘要 |
PURPOSE:To decrease the variance of a characteristic impedance of a transmission line transformer and the variance of the degree of coupling of a coil by winding a coil on a drum core and giving wiring to a terminal provided to a base fitted to the side face of a flange of the drum core. CONSTITUTION:The 1st base 1 having the 1st and 2nd terminals 6, 7, the 2nd base 2 having the 3rd and 4th terminals 8, 9, a drum core 3 clipped by the 1st and 2nd bases, and the 1st, 2nd and 3rd windings 10, 11, 12 wound of the drum core are provided, the 1st winding is connected between the 1st and 3rd terminals, the 2nd winding is connected between the 2nd and 3rd terminals, and the 3rd winding is connected between the 2nd and 4th terminals respectively. The windings 10, 11, 12 are applied to the upper part of the terminals 6, 7, 8. 9 and the connection between the balun coil and the printed board is applied under the terminals 6, 7, 8, 9. In fitting the balun coil, even when a stress is applied to the terminals, the connection of the terminals and windings is not disconnected.
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