SURFACE ACOUSTIC WAVE FILTER DEVICE, DUPLEXER INCLUDING THE SAME, AND ELECTRONIC APPARATUS INCLUDING THE SAME

摘要

PROBLEM TO BE SOLVED: To reduce insertion loss degradation of band high-frequency parts of a surface acoustic wave filter device, and to provide a duplexer and an electronic apparatus using the same. SOLUTION: In order to solve the problem, this surface acoustic wave filter device 10 includes a first surface acoustic wave filter 15 and a second surface acoustic wave filter 16, wherein the first surface acoustic wave filter 15 includes a first longitudinally-coupled surface acoustic wave filter 15a and a second longitudinally-coupled surface acoustic wave filter 15e; a first unbalanced signal input port 15b and a second unbalanced signal input port 15f are electrically connected to an input port 12; and a first balanced signal output port 15c and a third balanced signal output port 15g are electrically connected to an input/output ports 13a; and a second balanced signal output port 15d and a fourth balanced signal output port 15h are electrically connected to an input/output port 13b. COPYRIGHT: (C)2011,JPO&INPIT