Surface acoustic wave device having balanced and unbalanced terminals and a delay line

摘要

A surface acoustic wave device includes a first surface acoustic wave filter including at least two interdigital transducer IDTs arranged along a surface acoustic wave propagation direction on a piezoelectric substrate, and a second surface acoustic wave filter including at least two interdigital transducer IDTs arranged along the surface acoustic wave propagation direction on a piezoelectric substrate. The input terminals of the first and second surface acoustic wave filters are electrically connected to each other and to an unbalanced signal terminal via a common connection point. The output terminals of the surface acoustic wave filters are connected to balanced signal terminals, respectively. A delay line is introduced between the common connection point and the first surface acoustic wave filter on the piezoelectric substrate.