Acoustic wave duplexer

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.