| 摘要 |
PROBLEM TO BE SOLVED: To reduce a thermal resistance difference between a signal terminal and a reference potential terminal while excellently keeping filter characteristics in a filter and a duplexer, and to improve the reliability of soldering at the time of mounting. SOLUTION: The filter or the duplexer is provided with the signal terminal for external connection, the reference potential terminal and a common reference potential part electrically connected with the reference potential terminal, which are all formed of conductors, on one surface of a package, and a slit part for partially separating the common reference potential part and the reference potential terminal is provided between the common reference potential part and the reference potential terminal. The common reference potential part is formed over the almost entire one surface of the package, the slit part and a bridging part composed of the conductor are provided between the common reference potential part and the reference potential terminal, and the reference potential terminal is formed of solder resist. COPYRIGHT: (C)2006,JPO&NCIPI
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