Surface acoustic wave device

Details Surface acoustic wave device Surface acoustic wave device

1995-06-28

1998-01-27

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310344, 310346, H01L 4108

Patent

active

057125236

ABSTRACT:
A SAW device (11) includes a SAW element (13) which is bonded onto a support substrate (12) in a face down mode through solder (19, 20), and a metal cap (21) enclosing the SAW element (13). Assuming that and .alpha..sub.1, .alpha..sub.2 and .alpha..sub.3 represent the thermal expansion coefficients of the SAW element (13), the support substrate (12) and the conductive cap (21) along the surface wave propagation direction respectively, .alpha..sub.3 .ltoreq..alpha..sub.1 when .alpha..sub.1 >.alpha..sub.2, and .alpha..sub.3 .ltoreq..alpha..sub.1 when .alpha..sub.1 <.alpha..sub.2.

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