Patent ID: 7023297
Filing Date: 2006-04-04
Classification: H03H

Abstract:
1. A surface acoustic wave duplexer comprising: an antenna terminal; a transmission-side surface acoustic wave filter connected to the antenna terminal; a receiving-side surface acoustic wave filter connected to the antenna terminal; a package material on which the transmission-side surface acoustic wave filter and the receiving-side surface acoustic wave filter are mounted; and a high-frequency wave element connected to the transmission-side surface acoustic wave filter and the receiving-side surface acoustic wave filter; wherein the high-frequency wave element has two trap attenuation poles at frequencies higher than the frequencies of the transmission-side pass band; and the high-frequency wave element includes first and second inductors and first, second, and third capacitance elements, and the two trap attenuation poles are formed by the first and the second inductors and the first, second, and third capacitance elements.