Branching filter

Details Branching filter Branching filter

2007-06-21

2009-02-03

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S193000

Reexamination Certificate

active

07486158

ABSTRACT:
A branching filter suppresses the effect of a ripple at a high frequency side of a first band-pass filter having a relatively low frequency passband and achieves sufficient pass band widths of the first and second band-pass filters. The branching filter includes a first band-pass filter having a relatively low frequency passband and a second band-pass filter having a relatively high frequency passband. The first and second band-pass filters each have a SAW filter having a ladder circuit structure. The second band-pass filter has first to third parallel resonators. The first and second parallel resonators are commonly connected to a common-connection ground terminal. A first inductance is connected between the common-connection ground terminal and a ground potential. In the branching filter, a relationship f1>f0>f2is satisfied, wherein f0denotes an average of resonant frequencies of all the parallel resonators.

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Official Communication for PCT Application No. PCT/JP2005/021862; mailed Mar. 14, 2006.

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