| 摘要 |
<p>A surface acoustic wave filter (1) includes a surface acoustic wave element (3) including a piezoelectric substrate (3a) having IDTs (8a-e), input/output terminals (9a,9b), and reference potential terminals (9c,9e,9g) provided thereon and a package (2) enclosing the surface acoustic element and having electrode lands (5) and external terminals. The resonance frequency of the resonator defined by inductances generated by the reference potential terminals of the external terminals of the package, is positioned in the vicinity of an image frequency occurring at a time of performing frequency conversion in a super heterodyne system. <IMAGE></p> |
