US 11,909,377 B2
Acoustic wave filter with acoustic velocity adjustment structure
Joshua James Caron, Madison, NC (US); Rei Goto, Osaka (JP); Benjamin Paul Abbott, Irvine, CA (US); and Hiroyuki Nakamura, Osaka (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. 17/099,522.
Claims priority of provisional application 62/938,782, filed on Nov. 21, 2019.
Claims priority of provisional application 62/938,838, filed on Nov. 21, 2019.
Claims priority of provisional application 62/938,821, filed on Nov. 21, 2019.
Prior Publication US 2021/0159880 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 multi-mode surface acoustic wave filter comprising:
a first interdigital transducer electrode on a piezoelectric layer;
an acoustic reflector on the piezoelectric layer;
a second interdigital transducer electrode on the piezoelectric layer, the second interdigital transducer electrode longitudinally coupled to the first interdigital transducer electrode and positioned between the first interdigital transducer electrode and the acoustic reflector; and
an acoustic velocity adjustment structure positioned over at least a gap between the first interdigital transducer electrode and the second interdigital transducer electrode, the acoustic velocity adjustment structure arranged to increase an acoustic wave propagation velocity in a first region that includes the gap relative to a second region over at least a portion of the first interdigital transducer electrode.