| 摘要 |
<p>Provided is an elastic wave filter device wherein the out-of-band attenuation on the high band side of a passing band can be improved without impairing insertion loss in the passing band even if the elastic wave filter device is made compact. A filter mounting pattern (22) for mounting a longitudinally coupled resonator elastic wave filter is formed on one major surface (22a) of a package substrate, a back surface terminal pattern is formed on the other major surface, and an internal electrode pattern is formed internally. When the elastic wave filter device is seen through from the direction normal to one major surface of the body of a substrate, first via conductors (23p, 23q, 23r) which connects between a ground pattern element (22d) being connected with the ground pad of a longitudinally coupled resonator elastic wave filter of the filter mounting pattern (22) and an internal ground pattern element of the internal electrode pattern electrically are arranged asymmetrically with respect to a center line (X-X) passing through an input pattern element (22a) of the filter mounting pattern (22) and passing between two output pattern elements (22b, 22c).</p> |
