| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface acoustic wave device, and a communication unit comprising it, in which the balance between balance signal terminals 11 and 12 is enhanced by a balance-unbalance converting function. SOLUTION: A substrate 30, provided with a surface acoustic element having a balance-unbalance converting function, is provided at the bottom plate part 32 of a container 31 comprising a plurality of layers. An electrical wiring part is provided between the upper layer 35 and the lower layer 36 of the bottom plate part 32, such that a delay line, reactance component or a resistive component is added to at least one of the balance signal terminals 11 and 12. External terminals 52 and 53 of balance signal for externally connecting the surface acoustic element are provided symmetric with respect to the center of the container 31. |
