| 摘要 |
PURPOSE:To extend the length of a microstrip line and to easily perform the adjustment of inductance by connecting the microstrip line to a ground pattern with connection conductors formed in plural through holes and conducting spot facing to a terminal of the through hole. CONSTITUTION:A conductor of printed circuit board 11 is used, and the ground pattern 12 is formed on the back plane, and a microstrip 13 on the surface of the conductor. The plural through holes 14 are pierced in the longitudinal direction in the neighorhood of the terminal 13a of the strip line 13. The connection conductor 15 is formed on the hole 14, and the strip line 13 is connected to the ground pattern 12. The spot facing is conducted to the through hole on a terminal 13b side sequentially so as to set the resonance frequency of an oscillator within a prescribed range, and the spot facing is completed when it is set within the range. The diameter of the spot facing 16 is set larger than that of the through hole 14, and a spot facing plane can be set on either a line side or pattern side. In this way, the adjustment of the inductance can be easily performed by extending the line without cutting it. |
