| 摘要 |
A surface acoustic wave device the frequency characteristics of which can be flexibly regulated in response to a system request and which can be downsized and enhanced in out-band characteristics, wherein a grounding terminal wired to a comb-teeth-shaped electrode of a 2-port surface acoustic wave element is extended to face the output sides of both input and output signal terminals so as to form a capacitance, and an attenuation region is provided in a frequency band away from a pass band of a surface acoustic wave element by means of a resonance system including the capacitance, whereby it is possible to downsize the device by flip-chip mounting, improve characteristics in a high-frequency band, and solve a problem that an attenuation region cannot be provided in a frequency band away from a pass band due to an inability of forming a resonance system using a bonding wire inductance. |
