| 摘要 |
PURPOSE: A high-frequency filter having a variable elimination band function is provided to control a high-frequency elimination band by varying a capacitance and an inductance. CONSTITUTION: An inductor is connected between input/output terminals in parallel. A plurality of capacitors(31,32,33,34) is connected to the inductor in parallel. A DIP(Dual In-line Package) switch(SW) selects a connection between the inductor and the capacitors(31,32,33,34) and is mounted so as to vary the capacitance connected to the inductor. The inductor is comprised of a first ferrite core(21), a second ferrite core(22), and a third ferrite core(23). The inductor is comprised of a variable coil. As the DIP switch is on/off, the capacitances of the capacitors(31,32,33,34) are varied. As a result, a cut-off frequency is changed so that the high-frequency elimination band is varied.
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