US 11,658,688 B2
Multiplexer with bulk acoustic wave filter and multilayer piezoelectric substrate filter
Benjamin Paul Abbott, Irvine, CA (US); and Rei Goto, Osaka (JP)
Assigned to Skyworks Solutions, Inc., Irvine, CA (US)
Filed by Skyworks Solutions, Inc., Irvine, CA (US)
Filed on Apr. 30, 2020, as Appl. No. 16/863,030.
Claims priority of provisional application 62/841,663, filed on May 1, 2019.
Claims priority of provisional application 62/841,647, filed on May 1, 2019.
Prior Publication US 2020/0358464 A1, Nov. 12, 2020
Int. Cl. H03H 9/64 (2006.01); H03H 9/70 (2006.01); H03H 9/02 (2006.01); H04B 1/00 (2006.01); H03H 9/25 (2006.01)
CPC H04B 1/0057 (2013.01) [H03H 9/02574 (2013.01); H03H 9/25 (2013.01); H03H 9/6406 (2013.01); H03H 9/706 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A multiplexer with acoustic wave filters for filtering radio frequency signals, the multiplexer comprising:
a first acoustic wave filter having a first pass band, the first acoustic wave filter including bulk acoustic wave resonators having at least a first spurious mode below one or more resonant frequencies of the bulk acoustic wave resonators; and
a second acoustic wave filter coupled to the first acoustic wave filter at a common node, the second acoustic wave filter having a second pass band with a frequency range above the first pass band, the second pass band associated with a different frequency band than the first pass band, the second acoustic wave filter including multilayer piezoelectric substrate surface acoustic wave resonators having at least a second spurious mode above one or more resonant frequencies of the multilayer piezoelectric substrate surface acoustic wave resonators, the bulk acoustic wave resonators have a substantially constant first gamma in the second pass band, the multilayer piezoelectric substrate surface acoustic wave resonators having a substantially constant second gamma in the first pass band.