CPC H03H 9/02685 (2013.01) [H03F 3/245 (2013.01); H03H 9/02574 (2013.01); H03H 9/02834 (2013.01); H03H 9/02842 (2013.01); H03H 9/145 (2013.01); H03H 9/25 (2013.01); H03H 9/6406 (2013.01); H03H 9/6483 (2013.01); H04B 1/40 (2013.01); H03F 2200/451 (2013.01)] | 20 Claims |
1. A surface acoustic wave device comprising:
a piezoelectric layer;
a first reflector over the piezoelectric layer;
a second reflector over the piezoelectric layer;
an interdigital transducer electrode structure over the piezoelectric layer and positioned between the first reflector and the second reflector, the interdigital transducer electrode structure having a first side closer to the first reflector and a second side closer to the second reflector; and
a high speed layer positioned over at least a portion between the first side and the first reflector such that an acoustic wave propagation velocity in a fast region overlapping the high speed layer is greater than an acoustic wave propagation velocity in a region between the first side and the second side.
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