US 12,395,148 B2
Double-mode surface-acoustic-wave (DMS) filter having a transition region with a partly uniform geometric property
Charles Binninger, Saint-Jeannet (FR); Jacques-Antoine Damy, Nice (FR); Aimeric Bisognin, Antibes (FR); and Xavier Perois, Mouans Sartoux (FR)
Assigned to RF360 Singapore Pte. Ltd., Republic Plaza (SG)
Filed by RF360 Singapore Pte. Ltd., Singapore (SG)
Filed on Dec. 20, 2022, as Appl. No. 18/069,050.
Prior Publication US 2024/0204747 A1, Jun. 20, 2024
Int. Cl. H03H 9/145 (2006.01); H03H 3/08 (2006.01); H03H 9/64 (2006.01)
CPC H03H 9/14544 (2013.01) [H03H 3/08 (2013.01); H03H 9/6433 (2013.01)] 29 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a double-mode surface-acoustic-wave filter comprising:
at least one interdigital transducer comprising multiple fingers, the multiple fingers comprising:
a first set of fingers having a geometric property; and
a second set of fingers positioned adjacent to the first set of fingers and associated with an outer edge of the at least one interdigital transducer, wherein each finger of the first set of fingers and the second set of fingers has a uniform width with respect to other fingers of the first set of fingers and the second set of fingers, the geometric property across a first subset of the second set of fingers being substantially uniform, a value of the geometric property across the first subset of the second set of fingers being different than a value of the geometric property across the first set of fingers, wherein the geometric property across a second subset of the second set of fingers incrementally increases or decreases between the value of the geometric property across the first subset of the second set of fingers and the value of the geometric property across the first set of fingers.