US 11,909,378 B2
Acoustic wave device with velocity adjustment layer
Joshua James Caron, Madison, NC (US); Rei Goto, Osaka (JP); Benjamin Paul Abbott, Irvine, CA (US); and Hiroyuki Nakamura, Osaka-Fu (JP)
Assigned to Skyworks Solutions, Inc., Irvine, CA (US)
Filed by Skyworks Solutions, Inc., Irvine, CA (US)
Filed on Nov. 16, 2020, as Appl. No. 17/099,603.
Claims priority of provisional application 62/938,838, filed on Nov. 21, 2019.
Claims priority of provisional application 62/938,782, filed on Nov. 21, 2019.
Claims priority of provisional application 62/938,821, filed on Nov. 21, 2019.
Prior Publication US 2021/0159881 A1, May 27, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H03H 9/145 (2006.01); H03H 9/64 (2006.01); H03H 9/25 (2006.01); H03H 9/02 (2006.01); H03F 3/24 (2006.01); H04B 1/40 (2015.01)
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
OG exemplary drawing
 
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.