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US 10,476,479 B2Granted
Filter and filter module
AssigneeSamsung Electro-Mechanics Co., Ltd.
InventorsYoon Sok Park, June Kyoo Lee, Won Kyu Jeung
Life of this patent
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Abstract
A filter includes: series resonators connected to each other in series; shunt resonators connected to first nodes between some of the series resonators; and a variable capacitor connected to a second node between some of the series resonators, and forming a pole configured to suppress harmonics.
Claims15
A filter, comprising:
- series resonators connected to each other in series;
- shunt resonators connected to first nodes between some of the series resonators;
- and
- a variable capacitor connected to a second node between some of the series resonators
- wherein the variable capacitor is formed by a wiring electrode corresponding to the second node, a dummy connection pad disposed below the wiring electrode, and a substrate disposed between the wiring electrode and the dummy connection pad.
2 more elements
A filter module, comprising:
- a filter comprising
- bulk acoustic resonators each formed by a substrate, and a first electrode, a piezoelectric layer, and a second electrode that are sequentially stacked on the substrate, and
- at least one dummy connection pad disposed below the substrate;
- and
- a main substrate connected to a connection pad connected to either one or both of the first electrode and the second electrode via a bump,
- wherein the at least one dummy connection pad is disposed below a wiring electrode connecting adjacent bulk acoustic resonators among the bulk acoustic resonators.
3 more elements
A filter, comprising:
- a first series resonator and a second series resonator connected to each other in series;
- a shunt resonator connected to a first node between the first series resonator and the second series resonator;
- and
- a variable capacitor connected to a second node between the first series resonator and the second series resonator,
- wherein the variable capacitor is formed by a wiring electrode interconnecting the first series resonator and the second series resonator, a dummy connection pad disposed below the wiring electrode, and a substrate disposed between the wiring electrode and the dummy connection pad.
2 more elements
Dependencies are inferred from the claim text.