BAW duplexer without phase shifter

Details BAW duplexer without phase shifter BAW duplexer without phase shifter

2005-10-07

2008-03-04

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S189000, C455S082000

Reexamination Certificate

active

07339445

ABSTRACT:
A duplexer for connection with an antenna comprises an antenna port, a transmitting filter comprising bulk acoustic wave (BAW) resonators having a first antenna side impedance coupled with the antenna port, a receiving filter comprising BAW resonators having a second antenna side impedance coupled with the antenna port, and a shunt inductance coupled between the antenna port and ground. The shunt inductance and the first and second antenna side impedances of the transmitting filter and the receiving filter are selected in such a way that the shunt inductance turns the first and second input impedance in a negative direction in a Smith diagram.

REFERENCES:
patent: 6262637 (2001-07-01), Bradley et al.
patent: 6313715 (2001-11-01), Bergmann et al.
patent: 6927649 (2005-08-01), Metzger et al.
patent: 7034635 (2006-04-01), Nakamura et al.
patent: 7126440 (2006-10-01), Bradley et al.
patent: 2006/0066419 (2006-03-01), Iwaki et al.
patent: 2006/0139121 (2006-06-01), Jhung
patent: 2004-112277 (2004-04-01), None
patent: WO 2004/047290 (2004-06-01), None

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