Duplexer and communications equipment

Details Duplexer and communications equipment Duplexer and communications equipment

2007-12-26

2010-06-08

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S193000

Reexamination Certificate

active

07733197

ABSTRACT:
A duplexer includes a piezoelectric substrate, a transmitting filter, and a receiving filter. A transmitting filter includes a ladder filter having a first resonator group which has one or more resonators in one or more series arms and one or more resonators in one or more parallel arms. A receiving filter has a passband higher than that of the transmitting filter, and includes a second resonator group which has one or more resonators in one or more series arms and one or more resonators in one or more parallel arms. A node connects both the transmitting filter and the receiving filter. The receive-side closest resonator closest to the node in the parallel arm is closer to the node than a resonator which is closest to the node in the series arm, and a resonance frequency of the receive-side closest resonator is lower than the passband of the transmitting filter.

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Machine Translation of JP 09-294048 published Nov. 11, 1997.

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