Coupled BAW resonator based duplexers

Details Coupled BAW resonator based duplexers Coupled BAW resonator based duplexers

2005-11-08

2005-11-08

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S189000, C333S192000, C310S335000, C310S366000

Reexamination Certificate

active

06963257

ABSTRACT:
A duplexer comprising a transmit resonator device and a receive resonator device for filtering transmit and receive signals. The resonator device has a first BAW resonator for generating an acoustic wave signal from an input electric signal, a first acoustic delay for delaying the acoustic wave signal, and an intermediate BAW resonator for receiving the delayed acoustic wave signal at one end and converting the delayed acoustic wave signal to an electric signal. Through electrical coupling, the electric signal also appears at another end of the intermediate BAW resonator for generating a further acoustic wave signal at the other end. The resonator further comprises a second delay for delaying the further acoustic wave signal, and a second BAW resonator for producing an output electric signal from the delayed further acoustic wave signal. The duplexer can be used in a transceiver in a mobile phone.

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IEEE 2001 Ultrasonics Symposium Paper 3E-6; K.M. Lakin et al.; “High Performance Stacked Crystal Filters for GPS and Wide Bandwidth Applications”; pp. 1-6; Oct. 9, 2001.

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