| 摘要 |
PURPOSE: An apparatus for preventing noise of a surface acoustic wave filter system is provided to minimize noise due to feedthrough by installing a shield portion between an input portion and an output portion of the surface acoustic wave filter system. CONSTITUTION: A surface acoustic wave filter system includes a package(10) and a shield portion(50). A circuit including a surface acoustic wave filter(40) is installed in inside of the package in order to protect and array the circuit. The shield portion shields particular signals which is directly transmitted from an input portion to an output portion instead of the surface acoustic wave filter. The shield portion is formed with a metal plate which is connected to an external earth portion. The shield portion is provided to a lid of the package. |
