SURFACE ACOUSTIC WAVE ELEMENT

摘要

In a surface acoustic wave element in which interdigital electrodes (2 and 3) composed mainly of aluminum are formed on a lithium tantalate or lithium niobate substrate (1), the ratio of the film thickness of the electrodes (2 and 3) to the finger pitch of a plurality of electrode fingers connected to a common terminal is set to within the range of 0.03-0.10 by optimizing the propagation loss as a target function. Therefore, the propagation loss of a surface acoustic wave element can be made smaller than that of the conventional example. <IMAGE>