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US 2022/0045663 A1Published application
Acoustic filter with improved reflectivity
AssigneeRf360 Europe GmbH
InventorsSimone COLASANTI, Samir TAZARINE, Robert KOCH, Franz KUBAT
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Abstract
A filter circuit comprises a main operating unit (MU) arranged in the series signal line providing most of the filter function of the filter circuit. A micro acoustic last series resonator (RLs) as a last element of the main operating unit in the series signal line is prone to excite a spurious mode that is damped with a final series capacitance (CEs) circuited between the last element and the antenna terminal (AT).
Claims11
A filter circuit that provides a pass band, comprising:
- a series signal line (SLS) that connects a first terminal (T1) and an antenna terminal (AT);
- a main operating unit (MU) arranged in the series signal line providing most of the filter function of the filter circuit;
- a micro acoustic last series resonator (RSL) that is a last element in the series signal line and part of the main operating unit;
- and
- a final series capacitance (CES) circuited between the last element and the antenna terminal.
2 more elements
Dependencies are inferred from the claim text.