US 12,034,429 B2
Saw device with improved thermal management
Kamran Cheema, Apopka, FL (US); Bambang Kunardi, Singapore (SG); Yu Jen Chong, Singapore (SG); and Chong Choon Lee, Singapore (SG)
Assigned to RF360 Singapore Pte. Ltd., Singapore (SG)
Appl. No. 17/431,411
Filed by RF360 SINGAPORE PTE. LTD, Singapore (SG)
PCT Filed Jan. 24, 2020, PCT No. PCT/EP2020/051799
§ 371(c)(1), (2) Date Aug. 16, 2021,
PCT Pub. No. WO2020/173631, PCT Pub. Date Sep. 3, 2020.
Claims priority of application No. 10 2019 104 993.8 (DE), filed on Feb. 27, 2019.
Prior Publication US 2022/0140807 A1, May 5, 2022
Int. Cl. H03H 9/02 (2006.01); H03H 9/64 (2006.01)
CPC H03H 9/02834 (2013.01) [H03H 9/02992 (2013.01); H03H 9/6483 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A SAW filter device with a ladder type structure, comprising:
series resonators arranged in a series signal line;
respective shunt lines connected to respective nodes situated in the series signal line between two adjacent series resonators of the series resonators; and
parallel resonators each being arranged in a respective shunt line of the shunt lines, each of the parallel resonators comprising a first reflector, wherein:
each of the parallel resonators has a length measured in a longitudinal direction and a width measured in a transversal direction,
each of the two adjacent series resonators are connected via a common busbar extending over a length of the two adjacent series resonators,
a lateral extension of each of the common busbar forms a first section of each of the respective shunt lines,
each of the respective shunt lines comprises a broadened section that is broader than the respective common busbar, the broadened section located between the respective common busbar and a corresponding parallel resonator of the parallel resonators,
the broadened section extends over the width of the corresponding parallel resonator, and
the first reflector of each of the parallel resonators is formed at least in part from the broadened section.