Duplexer and ladder type filter

Details Duplexer and ladder type filter Duplexer and ladder type filter

2006-08-08

2009-08-11

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S193000, C333S195000, C333S189000

Reexamination Certificate

active

07573354

ABSTRACT:
A duplexer includes an antenna terminal, a first filter connected to the antenna terminal, and a second filter connected to the antenna terminal. At least one of the first filter and the second filter is a ladder type filter in which a parallel resonator and multiple series resonators are included, one or more first inductors are respectively connected in parallel with one or more series resonators out of the multiple series resonators, and one of the one or more first inductors is connected in parallel with one of the multiple series resonators that is arranged closest to the antenna terminal.

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Machine translation of Noguchi et al. JP 2002-223147, Aug. 9, 2002.
C.W. Seabury et al.; “Thin Film ZnO Based Bulk Acoustic Mode Filters”; 1997 IEEE Microwave Symposium Digest; vol. 1, pp. 181-184, Jun. 8-13, 1997.

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