Duplexer having resonator filters

Details Duplexer having resonator filters Duplexer having resonator filters

2009-07-27

2011-11-22

Takaoka, Dean (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S189000

Reexamination Certificate

active

08063717

ABSTRACT:
A duplexer interfacing a receiver and a transmitter with an antenna includes first and second filters. The first filter includes at least four first series resonators, four first shunt resonators respectively connected between the four first series resonators and ground voltage, and a mutual inductance commonly connected between two adjacent first shunt resonators. The second filter includes at least four second series resonators, four second shunt resonators respectively connected between the four second series resonators and the ground voltage, and a cross-coupling capacitor connected between a first capacitor node connected to at least one of the second series resonators and a second capacitor node connected to one of the second shunt resonators, and an inductor connected in series between second capacitor node and ground. Three of the second series resonators and the second shunt resonator to which the cross-coupling capacitor is connected are between the first and second capacitor nodes.

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