Patent ID: 6737936
Filing Date: 2004-05-18
Classification: H03H

Abstract:
A surface-acoustic-wave (SAW) duplexer comprising:a piezoelectric substrate having a first end and a second end opposite the first end; a first filter having a first SAW resonator and a second SAW resonator formed on the piezoelectric substrate, the first SAW resonator having a first resonance frequency, the second SAW resonator having a second resonance frequency higher than the first resonance frequency; and a second filter having a third SAW resonator and a fourth SAW resonator formed on the piezoelectric substrate, the third SAW resonator having a third resonance frequency higher than the first resonance frequency, the fourth SAW resonator having a fourth resonance frequency higher than the second resonance frequency and the third resonance frequency; wherein the second SAW resonator is disposed adjacent to the first end of the piezoelectric substrate and adjacent to the first SAW resonator, the second SAW resonator and the third SAW resonator being mutually separated.