| 摘要 |
PURPOSE:To reduce the inductance given from the outside and improve the band pass properties, by applying a conductive material to a resin case. CONSTITUTION:An elastic surface wave filter element 3 containing an input transducer and an output transducer is put on a metallic stem 4, and these element and the stem are stored in a resin case 5. Then a conductive material such as the carbon paste is applied on the surface of the case 5. As a result, the good band pass properties that exceeds by far the required value of inductance canbe obtained. And it is more effective to provide a conductive film at the side of the stem 4 than the side of the element 3. |
