Patent ID: 7859362

Claim:
A surface acoustic wave (SAW) duplexer comprising: a transmitting SAW filter having a first input portion and a first output portion; a receiving SAW filter having a second input portion and a second output portion; and a single piezoelectric substrate on which the transmitting and receiving SAW filters are arranged in series in an arranging direction, wherein the single piezoelectric substrate has first and second sides which face each other in an orthogonal direction, the orthogonal direction being orthogonal to the arranging direction, wherein the first output portion of the transmitting SAW filter is positioned closer to the first side than the second side, and the second input portion of the receiving SAW filter is positioned closer to the second side than the first side, wherein the single piezoelectric substrate has third and fourth sides which face each other in the arranging direction, and wherein the first output portion of the transmitting SAW filter is positioned closer to the third side than the fourth side, and the second input portion of the receiving SAW filter is positioned closer to the fourth side than the third side.