# US 2022/0286111 A1 · Acoustic resonator filter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2022/0286111 A1 - Document ID: US20220286111A1 - Status: Published application - Kind: A1 - Application number: 17/476,797 - Filed: 2021-09-16 - Published: 2022-09-08 - Earliest claimed: 2021-03-02 - Assignees: Samsung Electro-Mechanics Co., Ltd. - Applicants: Samsung Electro-Mechanics Co., Ltd. - Inventors: Hyun Min HWANG - Web page: https://patentgrep.com/patent/US20220286111A1 ## CPC - H03H 9/568: {consisting of a ladder configuration} - H03H 9/02125: {of parasitic elements} - H03H 9/17: having a single resonator (crystal tuning forks H03H9/21) - H03H 9/542: {including passive elements (H03H9/545 takes precedence)} - H03H 9/564: {implemented with thin-film techniques} - H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P) ## Abstract An acoustic resonator filter includes a series portion including at least one series acoustic resonator electrically connected, in series, between first and second ports of the acoustic resonator filter configured to pass a radio-frequency (RF) signal from the first port to the second port, a shunt portion including a plurality of shunt acoustic resonators electrically connected to each other, in anti-series, between one node of the series portion and a ground, and a DC voltage terminal configured to generate a DC voltage across at least one of the plurality of shunt acoustic resonators by an electrical connection of the DC voltage terminal to a first electrode of the at least one of the plurality of shunt acoustic resonators and to a different second electrode of the at least one of the plurality of shunt acoustic resonators. A DC voltage may be generated across the at least one series acoustic resonator. ## Claims ### Claim 1 An acoustic resonator filter comprising: a series portion of the acoustic resonator filter, the series portion including at least one series acoustic resonator electrically connected, in series, between first and second ports of the acoustic resonator filter configured to pass a radio-frequency (RF) signal from the first port to the second port; a shunt portion of the acoustic resonator filter, the shunt portion including a plurality of shunt acoustic resonators electrically connected to each other, in anti-series, between one node of the series portion and a ground; and a DC voltage terminal configured to generate a DC voltage across at least one of the plurality of shunt acoustic resonators by an electrical connection of the DC voltage terminal to a first electrode of the at least one of the plurality of shunt acoustic resonators and to a different second electrode of the at least one of the plurality of shunt acoustic resonators. ### Claim 2 (depends on 1) The acoustic resonator filter of claim 1, wherein the DC voltage terminal is configured to generate the DC voltage between a node, between two of the plurality of shunt acoustic resonators, and the ground. ### Claim 3 (depends on 1) The acoustic resonator filter of claim 1, wherein the DC voltage terminal is configured to generate a first DC voltage across at least one first shunt acoustic resonator of the at least one of the plurality of shunt acoustic resonators that is different from a DC voltage across at least one other shunt acoustic resonator of the plurality of shunt acoustic resonators when the first DC voltage is generated. ### Claim 4 (depends on 1) The acoustic resonator filter of claim 1, wherein the at least one series acoustic resonator includes a plurality of series acoustic resonators, and the DC voltage terminal is further configured to generate another DC voltage across at least one of the plurality of series acoustic resonators by another electrical connection of the DC voltage terminal to a first electrode of the at least one of the plurality of series acoustic resonators and to a different second electrode of the at least one of the plurality of series acoustic resonators. ### Claim 5 (depends on 1) The acoustic resonator filter of claim 1, wherein, with the DC voltage terminal configured to generates the DC voltage, a difference between a plurality of anti-resonant frequencies of the plurality of shunt acoustic resonators is smaller than a difference between a plurality of resonant frequencies of the plurality of shunt acoustic resonators when the DC voltage is generated. ### Claim 6 (depends on 1) The acoustic resonator filter of claim 1, wherein the DC voltage terminal is configured to generate the DC voltage to have a magnitude greater than 10V. ### Claim 7 (depends on 6) The acoustic resonator filter of claim 6, wherein the DC voltage terminal is further configured to generate the DC voltage to have a magnitude of 50V or less. ### Claim 8 (depends on 1) The acoustic resonator filter of claim 1, further comprising: a capacitor connected electrically, in parallel, with one or more shunt acoustic resonators of the at least one of the plurality of shunt acoustic resonators. ### Claim 9 (depends on 8) The acoustic resonator filter of claim 8, wherein the at least one of the plurality of shunt acoustic resonators includes two or more of the plurality of shunt acoustic resonators, and the one or more shunt acoustic resonators is a single shunt acoustic resonator. ### Claim 10 An acoustic resonator filter comprising: a series portion of the acoustic resonator filter, the series portion including a plurality of series acoustic resonators electrically connected, in anti-series, between first and second ports of the acoustic resonator filter configured to pass a radio-frequency (RF) signal from the first port to the second port; a shunt portion of the acoustic resonator filter, the shunt portion including at least one shunt acoustic resonator electrically connected between one node of the series portion and a ground; and a DC voltage terminal configured to generate a DC voltage across at least one of the plurality of series acoustic resonators by an electrical connection of the DC voltage terminal to a first electrode of the at least one of the plurality of series acoustic resonators and to a different second electrode of the at least one of the plurality of series acoustic resonators. ### Claim 11 (depends on 10) The acoustic resonator filter of claim 10, wherein the DC voltage terminal is configured to generate a first DC voltage across at least one first series acoustic resonator of the at least one of the plurality of series acoustic resonators that is different from a DC voltage across at least one other series acoustic resonator of the plurality of series acoustic resonators when the first DC voltage is generated. ### Claim 12 (depends on 10) The acoustic resonator filter of claim 10, wherein, with the DC voltage terminal configured to generates the DC voltage, a difference between a plurality of anti-resonant frequencies of the plurality of series acoustic resonators is smaller than a difference between a plurality of resonant frequencies of the plurality of series acoustic resonators when the DC voltage is generated. ### Claim 13 (depends on 10) The acoustic resonator filter of claim 10, wherein the DC voltage terminal is configured to generate the DC voltage to have a magnitude greater than 10V. ### Claim 14 An acoustic resonator comprising: a series portion of the acoustic resonator filter, the series portion including at least one series acoustic resonator electrically connected, in series, between first and second ports of the acoustic resonator filter configured to pass a radio-frequency (RF) signal from the first port to the second port; a shunt portion of the acoustic resonator filter, the shunt portion including a plurality of shunt acoustic resonators electrically connected to each other between one node of the series portion and a ground; and a DC voltage terminal configured to generate a DC voltage across at least one of the plurality of shunt acoustic resonators by an electrical connection of the DC voltage terminal to a first electrode of the at least one of the plurality of shunt acoustic resonators and to a different second electrode of the at least one of the plurality of shunt acoustic resonators, and wherein, with the DC voltage terminal configured to generates the DC voltage, a difference between a plurality of anti-resonant frequencies of the plurality of shunt acoustic resonators is smaller than a difference between a plurality of resonant frequencies of the plurality of shunt acoustic resonators when the DC voltage is generated. ### Claim 15 (depends on 14) The acoustic resonator filter of claim 14, wherein, with the DC voltage terminal configured to generates the DC voltage, the difference between the plurality of resonant frequencies of the plurality of shunt acoustic resonators is smaller than a difference between a resonant frequency, among the plurality of resonant frequencies, and a resonant frequency of the at least one series acoustic resonator when the DC voltage is generated, and wherein the resonant frequency, among the plurality of resonant frequencies, is higher than the resonant frequency of the at least one series acoustic resonator. ### Claim 16 (depends on 14) The acoustic resonator filter of claim 14, wherein the series portion and the shunt portion provide a pass band, each of the plurality of anti-resonant frequencies of the plurality of shunt acoustic resonators are positioned within the pass band, and each of the plurality of resonant frequencies of the plurality of shunt acoustic resonators are positioned outside the pass band. ### Claim 17 (depends on 14) The acoustic resonator filter of claim 14, wherein the DC voltage terminal is configured to generate the DC voltage between a node, between two of the plurality of shunt acoustic resonators, and the ground. ### Claim 18 (depends on 14) The acoustic resonator filter of claim 14, wherein the DC voltage terminal is configured to generate the DC voltage to have a magnitude greater than 10V. ### Claim 19 (depends on 18) The acoustic resonator filter of claim 18, wherein the DC voltage terminal is further configured to generate the DC voltage to have a magnitude of 50V or less. ### Claim 20 (depends on 14) The acoustic resonator filter of claim 14, further comprising: a capacitor connected electrically, in parallel, with one or more shunt acoustic resonators of the plurality of shunt acoustic resonators.