# US 12,191,835 B2 · LC filter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,191,835 B2 - Document ID: US12191835B2 - Status: Granted - Kind: B2 - Application number: 17/970,648 - Filed: 2022-10-21 - Published: 2023-02-09 - Granted: 2025-01-07 - Earliest claimed: 2020-05-25 - Assignees: Murata Manufacturing Co., Ltd. - Applicants: Murata Manufacturing Co., Ltd. - Inventors: Hiroto Motoyama - Web page: https://patentgrep.com/patent/US12191835B2 ## CPC - H03H 7/0115: {comprising only inductors and capacitors (H03H7/075, H03H7/09, H03H7/12, H03H7/13 take precedence)} - H03H 7/03: comprising means for compensation of loss - H01F 27/00: Details of transformers or inductances, in general - H01G 4/40: Structural combinations of fixed capacitors with other electric elements, the structure mainly consisting of a capacitor, e.g. RC combinations - H03H 1/00: Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network (constructional details of electromechanical transducers H03H9/00) - H03H 7/0138: {Electrical filters or coupling circuits} - H03H 7/0161: {Bandpass filters (H03H7/12 takes precedence)} - H03H 7/1741: {Comprising typical LC combinations, irrespective of presence and location of additional resistors (when resistors are present, also classify in H03H7/06 - H03H7/07)} - H03H 2001/0085: {Multilayer, e.g. LTCC, HTCC, green sheets} - H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P) - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10) ## Abstract An LC filter includes an input terminal, an output terminal, a multilayer body, plate electrodes, connection electrodes connecting the plate electrodes, capacitor electrodes, and a inductor vias. Each of the capacitor electrodes opposes the plate electrode. One end of an inductor via is connected with the input terminal with a capacitor electrode interposed therebetween. Another end of the inductor via is connected to an intermediate point of a connection electrode. An inductor via is connected between the plate electrode and a capacitor electrode. An inductor via is connected between the plate electrode and a capacitor electrode. One end of an inductor via is connected with the output terminal with a capacitor electrode interposed therebetween. Another end of the inductor via is connected to an intermediate point of a connection electrode. ## Claims ### Claim 1 An LC filter comprising: an input terminal; an output terminal; a multilayer body including a plurality of dielectric layers; a first electrode and a second electrode provided on different dielectric layers of the plurality of dielectric layers from each other in the multilayer body; connection electrodes connecting the first electrode and the second electrode; a first capacitor electrode, a second capacitor electrode, a third capacitor electrode, and a fourth capacitor electrode each opposing the second electrode; a first inductor via connected with the first capacitor electrode; a second inductor via connected with the second capacitor electrode; a third inductor via connected with the third capacitor electrode; and a fourth inductor via connected with the fourth capacitor electrode; wherein one end of the first inductor via is connected with the input terminal with the first capacitor electrode interposed therebetween; another end of the first inductor via is connected at a position on one of the connection electrodes between the first electrode and the second electrode; the second inductor via is connected between the first electrode and the second capacitor electrode; the third inductor via is connected between the first electrode and the third capacitor electrode; one end of the fourth inductor via is connected with the output terminal with the fourth capacitor electrode interposed therebetween; and another end of the fourth inductor via is connected at a position on one of the connection electrodes between the first electrode and the second electrode. ### Claim 2 (depends on 1) The LC filter according to claim 1, further comprising: a ground terminal; wherein the first electrode and the second electrode are connected with the ground terminal; the multilayer body is provided in a rectangular parallelepiped including a first side surface and a second side surface opposite each other; the connection electrodes include a first ground via and a second ground via extending in a layering direction of the multilayer body; and when viewed in plan from the layering direction of the multilayer body: the first ground via and the third inductor via are located along the first side surface; and the second ground via and the second inductor via are located along the second side surface. ### Claim 3 (depends on 2) The LC filter according to claim 2, wherein when viewed in plan from the layering direction of the multilayer body, a first imaginary line connecting the second inductor via and the third inductor via intersects with a second imaginary line connecting the first ground via and the second ground via. ### Claim 4 (depends on 3) The LC filter according to claim 3, wherein the second imaginary line intersects with the first imaginary line at a midpoint of the first imaginary line. ### Claim 5 (depends on 4) The LC filter according to claim 4, wherein the second imaginary line intersects with the first imaginary line at a midpoint of the second imaginary line. ### Claim 6 (depends on 2) The LC filter according to claim 2, further comprising: a fifth capacitor electrode opposing the second electrode; and a fifth inductor via located along the second side surface and connected with the first electrode and the fifth capacitor electrode; wherein when viewed in plan from the layering direction of the multilayer body: the connection electrodes further include a third ground via located along the first side surface and connecting the first electrode and the second electrode; the second ground via is located between the second inductor via and the fifth inductor via; and the third inductor via is located between the first ground via and the third ground via. ### Claim 7 (depends on 6) The LC filter according to claim 6, wherein the first ground via and the third ground via are located adjacent to a first side surface of the multilayer body and the second ground via is located adjacent to a second side surface of the multilayer body which is opposite to the first side surface. ### Claim 8 (depends on 6) The LC filter according to claim 6, wherein the first through third ground vias are located on two sides of signal transfer paths between respective ones of the first through third inductor vias. ### Claim 9 (depends on 6) The LC filter according to claim 6, wherein the first through third ground vias and the first through third inductor vias are arranged symmetrically within the multilayer body. ### Claim 10 (depends on 2) The LC filter according to claim 2, further comprising: a fourth ground via and a fifth ground via that connect the first electrode and the second electrode; wherein when viewed in plan from the layering direction of the multilayer body: the third inductor via is located between the first ground via and the fourth ground via along the first side surface; and the second inductor via is located between the second ground via and the fifth ground via along the second side surface. ### Claim 11 (depends on 10) The LC filter according to claim 10, wherein the first through fifth ground vias are located on two sides of signal transfer paths between respective ones of the first through fifth inductor vias. ### Claim 12 (depends on 2) The LC filter according to claim 2, wherein at least one of the first ground via and the second ground via are located at a corner of the multilayer body. ### Claim 13 (depends on 1) The LC filter according to claim 1, wherein the first capacitor electrode, the second capacitor electrode, the third capacitor electrode, and the fourth capacitor electrode each define capacitances together with the second electrode. ### Claim 14 (depends on 1) The LC filter according to claim 1, wherein the multilayer body is a rectangular parallelepiped including a first side surface and a second side surface opposite each other; and the connection electrodes are plate-shaped electrodes provided on the first side surface and the second side surface. ### Claim 15 (depends on 1) The LC filter according to claim 1, wherein the multilayer body is made of ceramic. ### Claim 16 (depends on 1) The LC filter according to claim 1, wherein the LC filter is a band pass filter.