Filter device comprising two connected filter circuits
AssigneeRF360 Singapore Pte. Ltd.
InventorsGeorgiy Sevskiy, Stefan Freisleben, Patric Heide, Oleksandr Ruban, Igor Ielegechev
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Abstract
A filter device having a reduced sensitivity to production tolerances comprises a multilayer panel with integrated wiring, a piezoelectric substrate mounted to the panel. A first filter circuit (FC1) and a signal path (SP) comprising a second filter circuit are realized on the substrate and connected to a common antenna terminal (AT) as well as to a common node (CN) located on top of the piezoelectric substrate. A first matching circuit (MC1) and further matching circuits (MC2) are realized by the wiring in the multilayer panel.
Claims10
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.
Dependencies are inferred from the claim text.