Ladder filter, branching filter, and communication apparatus

Details Ladder filter, branching filter, and communication apparatus Ladder filter, branching filter, and communication apparatus

2006-02-07

2006-02-07

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S189000, C333S193000, C333S195000

Reexamination Certificate

active

06995631

ABSTRACT:
A ladder filter includes series arm resonators and parallel arm resonators which are alternately connected to each other. The series arm resonators include a first series arm resonator connected in parallel with an inductor and a second series arm resonator not connected to the inductor. The ladder filter satisfies the relationship of fsr1<fsr2,where fsr1represents the resonant frequency of the first series arm resonator and fsr2represents the resonant frequency of the second series arm resonator.

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