| 摘要 |
PURPOSE:To use a trap circuit in common with a resonator circuit, by using a resonance element as a capacitor of a parallel resonance circuit, which shows a small impedance at a frequency to be trapped and a very large impedance at frequencies apart from a prescribed frequency. CONSTITUTION:A coil 11 and a resonance element 10 acting like a capacitor form the parallel resonance circuit. This resonance element 10 shows a small impedance at the frequency to be trapped and a very large impedance at frequencies apart from the frequency. Thus, the required frequency is picked up at the parallel resonance circuit and the other frequencies are trapped, then no separate trap circuit is required and the number of circuit components is reduced. |
