# US 11,121,692 B2 · Noise filter circuit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,121,692 B2 - Document ID: US11121692B2 - Status: Granted - Kind: B2 - Application number: 16/641,384 - Filed: 2017-09-12 - Published: 2020-06-18 - Granted: 2021-09-14 - Earliest claimed: 2017-09-12 - Assignees: Mitsubishi Electric Corporation - Applicants: Mitsubishi Electric Corporation - Inventors: Satoshi Yoneda - Web page: https://patentgrep.com/patent/US11121692B2 ## CPC - H03H 7/09: Filters comprising mutual inductance - H03H 1/0007: {of radio frequency interference filters} - H03H 7/0115: {comprising only inductors and capacitors (H03H7/075, H03H7/09, H03H7/12, H03H7/13 take precedence)} - H03H 7/425: {Balance-balance networks} - H05K 1/0216: {Reduction of cross-talk, noise or electromagnetic interference (grounding H05K1/0215)} - H05K 1/162: {incorporating printed capacitors} - H05K 1/165: {incorporating printed inductors} - H03H 2001/0085: {Multilayer, e.g. LTCC, HTCC, green sheets} - H05K 1/0233: {Filters, inductors or a magnetic substance} - H05K 1/16: incorporating printed electric components, e.g. printed resistors, capacitors or inductors - H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P) - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS ## Abstract An input loop line (5) is disposed in a region inside or outside the loop of an output loop line (9) as viewed in the thickness direction of a dielectric layer (2). ## Claims ### Claim 1 A noise filter circuit comprising: a dielectric layer having one side on which an input line, an input loop line, a capacitor connection line, and an output line are formed, the input line, the input loop line, and the capacitor connection line being connected in series in this order, and having another side on which an output loop line connected between the capacitor connection line and the output line and a ground conductor surrounding the output loop line are formed, the capacitor connection line being branched from a route formed by the input loop line and the output loop line at a node at which the input loop line and the output loop line are connected; and a capacitor having one end connected to the capacitor connection line and another end connected to the ground conductor, wherein a winding direction of the input loop line from the input line to the capacitor connection line is same as a winding direction of the output loop line from the capacitor connection line to the output line, and the input loop line is disposed in a region inside or outside the output loop line as viewed in a thickness direction of the dielectric layer. ### Claim 2 (depends on 1) The noise filter circuit according to claim 1, wherein each of the input loop line and the output loop line has a partially opened rectangular loop shape. ### Claim 3 (depends on 1) The noise filter circuit according to claim 1, wherein each of the input loop line and the output loop line has a partially opened circular loop shape. ### Claim 4 (depends on 1) The noise filter circuit according to claim 1, wherein the input loop line is disposed in the region inside or outside the output loop line as viewed in the thickness direction of the dielectric layer, so that a mutual inductance between the input loop line and output loop line is suppressed in a case of misalignment between the input loop line and output loop line. ### Claim 5 A noise filter circuit comprising: a dielectric layer having one side on which a positive-electrode-side input line, a positive-electrode-side input loop line, a positive-electrode-side capacitor connection line, a positive-electrode-side output line, a negative-electrode-side input line, a negative-electrode-side input loop line, a negative-electrode-side capacitor connection line, and a negative-electrode-side output line are formed, the positive-electrode-side input line, the positive-electrode-side input loop line, and the positive-electrode-side capacitor connection line being connected in series in this order, the negative-electrode-side input line, the negative-electrode-side input loop line, and the negative-electrode-side capacitor connection line being connected in series in this order, and having another side on which a positive-electrode-side output loop line connected between the positive-electrode-side capacitor connection line and the positive-electrode-side output line and a negative-electrode-side output loop line connected between the negative-electrode-side capacitor connection line and the negative-electrode-side output line are formed, the positive-electrode-side capacitor connection line being branched from a route formed by the positive-electrode-side input loop line and the positive-electrode-side output loop line at a node at which the positive-electrode-side input loop line and the positive-electrode-side output loop line are connected, and the negative-electrode-side capacitor connection line being branched from a route formed by the negative-electrode-side input loop line and the negative-electrode-side output loop line at a node at which the negative-electrode-side: input loop line and the negative-electrode-side output loop line are connected; and a capacitor having one end connected to the positive-electrode-side capacitor connection line and another end connected to the negative-electrode-side capacitor connection line, wherein a winding direction of the positive-electrode-side input loop line from the positive-electrode-side input line to the positive-electrode-side capacitor connection line is same as a winding direction of the positive-electrode-side output loop line from the positive-electrode-side capacitor connection line to the positive-electrode-side output line, a winding direction of the negative-electrode-side input loop line from the negative-electrode-side input line to the negative-electrode-side capacitor connection line is same as a winding direction of the negative-electrode-side output loop line from the negative-electrode-side capacitor connection line to the negative-electrode-side output line, the positive-electrode-side input loop line is disposed in a region inside or outside of the positive-electrode-side output loop line as viewed in a thickness direction of the dielectric layer, and the negative-electrode-side input loop line is disposed in a position inside or outside of the negative-electrode-side output loop line as viewed in the thickness direction of the dielectric layer. ### Claim 6 (depends on 5) The noise filter circuit according to claim 5, wherein each of the positive-electrode-side input loop line, the positive-electrode-side output loop line, the negative-electrode-side input loop line, and the negative-electrode-side output loop line has a partially opened rectangular loop shape. ### Claim 7 (depends on 5) The noise filter circuit according to claim 5, wherein each of the positive-electrode-side input loop line, the positive-electrode-side output loop line, the negative-electrode-side input loop line, and the negative-electrode-side output loop line has a partially opened circular loop shape. ### Claim 8 A noise filter circuit comprising: a dielectric layer having one side on which a positive-electrode-side input line, a positive-electrode-side input loop line, a positive-electrode-side capacitor connection line, a positive-electrode-side output line, a negative-electrode-side input line, a negative-electrode-side input loop line, a negative-electrode-side capacitor connection line, and a negative-electrode-side output line are formed, the positive-electrode-side input line, the positive-electrode-side input loop line, and the positive-electrode-side capacitor connection line being connected in series in this order, the negative-electrode-side input line, the negative-electrode-side input loop line, and the negative-electrode-side capacitor connection line being connected in series in this order, and having another side on which a positive-electrode-side output loop line connected between the positive-electrode-side capacitor connection line and the positive-electrode-side output line and a negative-electrode-side output loop line connected between the negative-electrode-side capacitor connection line and the negative-electrode-side output line are formed, the positive-electrode-side capacitor connection line being branched from a route formed by the positive-electrode-side input loop line and the positive-electrode-side output loop line at a node at which the positive-electrode-side input loop line and the positive-electrode-side output loop line are connected, and the negative-electrode-side capacitor connection line being branched from a route formed by the negative-electrode-side input loop line and the negative-electrode-side output loop line at a node at which the negative-electrode-side input loop line and the negative-electrode-side output loop line are connected; and a capacitor having one end connected to the positive-electrode-side capacitor connection line and another end connected to the negative-electrode-side capacitor connection line, wherein a winding direction of the positive-electrode-side input loop line from the positive-electrode-side input line to the positive-electrode-side capacitor connection line is same as a winding direction of the positive-electrode-side output loop line from the positive-electrode-side capacitor connection line to the positive-electrode-side output line, a winding direction of the negative-electrode-side input loop line from the negative-electrode-side input line to the negative-electrode-side capacitor connection line is same as a winding direction of the negative-electrode-side output loop line from the negative-electrode-side capacitor connection line to the negative-electrode-side output line, each of the positive-electrode-side input loop line and the positive-electrode-side output loop line has a partially opened rectangular loop shape, and a long side of the positive-electrode-side input loop line and a long side of the positive-electrode-side output loop line are orthogonal to each other as viewed in a thickness direction of the dielectric layer, and each of the negative-electrode-side input loop line and the negative-electrode-side output loop line has a partially opened rectangular loop shape, and a long side of the negative-electrode-side input loop line and a long side of the negative-electrode-side output loop line are orthogonal to each other as viewed in a thickness direction of the dielectric layer. ### Claim 9 A noise filter circuit comprising: a dielectric layer having one side on which an input line, an input loop line, a capacitor connection line, and an output line are formed, the input line, the input loop line, and the capacitor connection line being connected in series in this order, and having another side on which an output loop line connected between the capacitor connection line and the output line and a ground conductor surrounding the output loop line are formed, the capacitor connection line being branched from a route formed by the input loop line and the output loop line at a node at which the input loop line and the output loop line are connected; and a capacitor having one end connected to the capacitor connection line and another end connected to the ground conductor, wherein a winding direction of the input loop line from the input line to the capacitor connection line is same as a winding direction of the output loop line from the capacitor connection line to the output line, and each of the input loop line and the output loop line has a partially opened rectangular loop shape, and a long side of the input loop line and a long side of the output loop line are orthogonal to each other as viewed in a thickness direction of the dielectric layer.