Patent ID: 7804380

Claim:
An acoustic wave duplexer comprising: a substrate; a reception acoustic wave filter chip; and a transmission acoustic wave filter chip; wherein the reception acoustic wave filter chip and the transmission acoustic wave filter chip are mounted on the substrate; the substrate includes first and second balanced terminals, a common terminal, and a signal terminal; each of the transmission acoustic wave filter chip and the reception acoustic wave filter chip includes at least one acoustic wave excitation electrode; and at least one of the transmission acoustic wave filter chip and the reception acoustic wave filter chip is a balanced filter unit that includes, as an input terminal or an output terminal, a first balanced signal end and a second balanced signal end; the acoustic wave duplexer further comprising: a first interconnection arranged to connect the balanced filter unit and the first balanced terminal and a second interconnection arranged to connect the balanced filter unit and the second balanced terminal; wherein the first balanced signal end of the balanced filter unit includes a junction of the balanced filter unit and the first interconnection, and the second balanced signal end thereof includes a junction of the balanced filter unit and the second interconnection; and the first and second interconnections intersect with each other and are insulated from each other.