US 12,237,825 B2
Filter device comprising two connected filter circuits
Georgiy Sevskiy, Munich (DE); Stefan Freisleben, Neubiberg (DE); Patric Heide, Vaterstetten (DE); Oleksandr Ruban, Munich (DE); and Igor Ielegechev, Munich (DE)
Assigned to RF360 Singapore Pte. Ltd., Singapore (SG)
Appl. No. 17/628,201
Filed by RF360 SINGAPORE PTE. LTD., Republic Plaza (SG)
PCT Filed Jul. 9, 2020, PCT No. PCT/EP2020/069405
§ 371(c)(1), (2) Date Jan. 18, 2022,
PCT Pub. No. WO2021/018543, PCT Pub. Date Feb. 4, 2021.
Claims priority of application No. 10 2019 120 312.0 (DE), filed on Jul. 26, 2019.
Prior Publication US 2022/0255529 A1, Aug. 11, 2022
Int. Cl. H03H 9/05 (2006.01); H03H 9/72 (2006.01); H03H 9/74 (2006.01); H03H 1/00 (2006.01)
CPC H03H 9/0576 (2013.01) [H03H 9/0561 (2013.01); H03H 9/725 (2013.01); H03H 9/74 (2013.01); H03H 2001/0085 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A filter device comprising:
a multilayer panel with wiring;
a piezoelectric substrate mounted to the multilayer panel;
a first filter circuit;
a signal path comprising a second filter circuit, wherein the first filter circuit and the second filter circuit are both filter circuits being realized on a top surface of the piezoelectric substrate and connected to a common antenna terminal on the piezoelectric substrate;
a first matching circuit having a first end connected to the common antenna terminal on the piezoelectric substrate and a second end connected to the signal path with the second filter circuit, the first matching circuit including the wiring in the multilayer panel; and
a common node to which the first filter circuit, the signal path and the common antenna terminal are connected to, the common node being a pad located on the top surface of the piezoelectric substrate.