Patent ID: 7479845

Claim:
A surface acoustic wave (SAW) duplexer comprising: a transmitting SAW filter having: a plurality of first SAW resonators connected to a ground, and an output portion; a receiving SAW filter having: a plurality of second SAW resonators connected to the ground, and an input portion, wherein a number of the second SAW resonators is larger than a number of the first SAW resonators; a single piezoelectric substrate on which the transmitting and receiving SAW filters are formed; a package base board on which the single piezoelectric substrate is mounted; an antenna terminal formed on the package base board, wherein the antenna terminal is connected to the output portion of the transmitting SAW filter and the input portion of the receiving SAW filter; an input terminal positioned on the package base board, the antenna terminal being electrically connected to the input portion of the receiving SAW filter through the input terminal of the package base board; and an output terminal positioned on the package base board, the antenna terminal being electrically connected to the output portion of the transmitting SAW filter through the output terminal of the package base board, wherein a distance between the input terminal and the output terminal of the package base board is greater than a distance between the output portion of the transmitting SAW filter and the input portion of the receiving SAW filter.