COMPOSITE LC FILTER CIRCUIT AND COMPOSITE LC FILTER COMPONENT

摘要

PROBLEM TO BE SOLVED: To provide a composite LC filter with a small insertion loss where the effect of a terminating state of input/output terminals on a pass band is small and to provide a composite LC filter component.;SOLUTION: A band pass filter F11 is connected between a common input output terminal 12 and an input output terminal 13 and a band pass filter F12 is connected between the common input output terminal 12 and an input output terminal 14 in the composite LC filter circuit 11. The band pass filter F11 comprises a series resonance circuit including an inductor L1 and a capacitor C1 and has a pass band f1 whose center frequency is the series resonance frequency. The band pass filter F12 comprises a series resonance circuit including an inductor L2 and a capacitor C2 and has a pass band f2 (f1) whose center frequency is the series resonance frequency.;COPYRIGHT: (C)2002,JPO