| 摘要 |
PURPOSE: A surface acoustic filter is provided to reduce the size of a device by minimizing volume an area required for a signal electrode and a ground electrode. CONSTITUTION: A package(30) is provided with a plurality of connecting terminals(30a-30f). A piezoelectric substrate(40) is provided within the package(30). A plurality of input IDTs(InterDigital Transducers)(50,60) and output IDTs(70,80) are formed on the piezoelectric substrate(40) in a pattern and filter a signal inputted from an outside to output the filtered signal. A ground unit(90) is provided between the input IDTs(50,60) and the output IDTs(70,80) to eliminate noise of the filtered signal. The input IDTs(50,60), the output IDTs(70,80), and the ground unit(90) are connected to the connecting terminals(30a-30f) through a wire bonding in order to input/output a signal. |
