| 摘要 |
The purpose of the present invention is to provide a technique enabling improvement isolation properties between a transmitting filter element and a receiving filter element without increasing the scale of a splitter. A filter route (C1) which has excellent attenuation properties for transmission signals and is less susceptible to the impact of transmission signals inputted to a transmitting SAW filter element (14a) is disposed close to a transmission terminal (17a), and a filter route (C2) which has poor attenuation properties for a transmission signal band and is more susceptible to the impact of transmission signals inputted to the transmitting SAW filter element (14a) is disposed apart from the transmission terminal (17a). Therefore, the isolation properties in a differential mode of a splitter (10) can be improved, and the isolation properties between the transmitting SAW filter element (14a) and a receiving SAW filter element (15a) can be improved without the scale of the splitter (10) being increased such as by the provision of a shielding means such as a shield electrode as in the prior art. |
