# US 12,120,820 B2 · Electronic device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,120,820 B2 - Document ID: US12120820B2 - Status: Granted - Kind: B2 - Application number: 17/849,752 - Filed: 2022-06-27 - Published: 2022-10-13 - Granted: 2024-10-15 - Earliest claimed: 2020-01-20 - Assignees: Murata Manufacturing Co., Ltd. - Applicants: Murata Manufacturing Co., Ltd. - Inventors: Keiichi Ichikawa - Web page: https://patentgrep.com/patent/US12120820B2 ## CPC - H05K 1/147: {at least one of the printed circuits being bent or folded, e.g. by using a flexible printed circuit (H05K1/148 takes precedence)} - H01P 5/028: {between strip lines} - H05K 1/0218: {by printed shielding conductors, ground planes or power plane (H05K1/0236 takes precedence)} - H05K 1/0219: {Printed shielding conductors for shielding around or between signal conductors, e.g. coplanar or coaxial printed shielding conductors} - H05K 2201/056: Folded around rigid support or component - H05K 2201/09063: Holes or slots in insulating substrate not used for electrical connections - H05K 2201/09236: Parallel layout - H05K 2201/10098: Components for radio transmission, e.g. radio frequency identification [RFID] tag, printed or non-printed antennas - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B) ## Abstract An electronic device includes first and second circuit boards. The second circuit board includes a first portion facing a first main surface of the first circuit board, a second portion facing a second main surface opposite to the first main surface, and a bent portion connecting the first portion and the second portion to each other. The second circuit board includes an element, signal conductors, and a first opening. The first opening is between the signal conductors when viewed in a thickness direction of the element. The first opening extends from the first portion to the second portion through the bent portion. The first portion and the second portion each include a portion not including the first opening between the signal conductors. ## Claims ### Claim 1 An electronic device, comprising: a first circuit board including a first main surface and a second main surface opposite to each other; and a second circuit board including a first portion facing the first main surface, a second portion facing the second main surface, and a bent portion connecting the first portion and the second portion to each other; wherein the second circuit board includes: a circuit portion defining the first portion, the bent portion, and the second portion and having insulating properties; a plurality of signal conductors on the circuit portion, extending in a first direction in which the first portion, the bent portion, and the second portion are connected, and being spaced apart from each other in a second direction orthogonal or substantially orthogonal to the first direction; and a first opening between the plurality of signal conductors when viewed in a thickness direction of the circuit portion; the first opening extends from at least one of the first portion or the second portion to the bent portion; the first portion and the second portion each include a portion not including the first opening between the plurality of signal conductors; and the circuit portion included in the second circuit board has a relative permittivity lower than a relative permittivity of a circuit portion included in the first circuit board and having insulating properties. ### Claim 2 (depends on 1) The electronic device according to claim 1, wherein the bent portion has a thickness smaller than a thickness of the first portion and a thickness of the second portion. ### Claim 3 (depends on 1) The electronic device according to claim 1, wherein a length of the first opening in the second direction at an end portion in the first portion is smaller than a length of the first opening in the second direction at another portion. ### Claim 4 (depends on 1) The electronic device according to claim 1, wherein a length of the first opening in the second direction at the bent portion is larger than a length of the first opening in the second direction at portions overlapping the first portion and the second portion. ### Claim 5 (depends on 1) The electronic device according to claim 1, wherein the first circuit board has a length in the second direction larger than a length in the first direction. ### Claim 6 (depends on 1) The electronic device according to claim 1, wherein the first opening extends from the first portion to the second portion through the bent portion; and the first opening continuously extends in the first direction between both ends of the bent portion. ### Claim 7 (depends on 1) The electronic device according to claim 1, wherein the second circuit board includes a second opening between the plurality of signal conductors when viewed in the thickness direction of the circuit portion of the second circuit board; the second opening is in at least one of the second portion or the bent portion; the second opening is spaced apart from the first opening in the first direction; and the second portion includes a portion not including the second opening between the plurality of signal conductors. ### Claim 8 (depends on 7) The electronic device according to claim 7, wherein the first opening extends from the first portion to the bent portion; and the second opening extends from the second portion to the bent portion. ### Claim 9 (depends on 1) The electronic device according to claim 1, wherein the second circuit board includes a third opening between the plurality of signal conductors when viewed in the thickness direction of the circuit portion of the second circuit board; the third opening extends from at least one of the first portion or the second portion to the bent portion; the third opening is spaced apart from the first opening in the second direction; and the first portion and the second portion each include a portion not including the third opening between the plurality of signal conductors. ### Claim 10 An electronic device, comprising: a first circuit board including a first main surface and a second main surface opposite to each other; and a second circuit board including a first portion facing the first main surface, a second portion facing the second main surface, and a bent portion connecting the first portion and the second portion to each other; wherein the second circuit board includes: a circuit portion defining the first portion, the bent portion, and the second portion and having insulating properties; a plurality of signal conductors on the circuit portion, extending in a first direction in which the first portion, the bent portion, and the second portion are connected, and being spaced apart from each other in a second direction orthogonal or substantially orthogonal to the first direction; and a first opening between the plurality of signal conductors when viewed in a thickness direction of the circuit portion; the first opening extends from at least one of the first portion or the second portion to the bent portion; the first portion and the second portion each include a portion not including the first opening between the plurality of signal conductors; the second circuit board includes a planar ground conductor on the circuit portion of the second circuit board, facing the plurality of signal conductors, and spaced apart from the plurality of signal conductors in the thickness direction of the circuit portion; and the second circuit board has a strip line structure. ### Claim 11 (depends on 10) The electronic device according to claim 10, wherein the plurality of signal conductors in the second circuit board are located closer to the first circuit board than the ground conductor. ### Claim 12 (depends on 10) The electronic device according to claim 10, wherein the second circuit board includes, at the first portion, a plurality of external connection conductors respectively connected to the plurality of signal conductors; and the plurality of external connection conductors are located at a portion of the first portion not including the first opening. ### Claim 13 (depends on 12) The electronic device according to claim 12, wherein the ground conductor is located at the portion of the first portion not including the first opening. ### Claim 14 (depends on 13) The electronic device according to claim 13, wherein the ground conductor at the portion of the first portion not including the first opening has a length in the second direction that is larger than a length of the first opening in the second direction. ### Claim 15 (depends on 13) The electronic device according to claim 13, further comprising: an external connection conductor between the plurality of signal conductors, the external connection conductor being connected to the ground conductor at the portion of the first portion not including the first opening; and the external connection conductor between the plurality of signal conductors has a length in the second direction larger than a length of the first opening in the second direction. ### Claim 16 (depends on 10) The electronic device according to claim 10, wherein a length of the first opening in the second direction is larger than an unopposed width of a portion where the plurality of signal conductors and the ground conductor do not face each other; the unopposed width is larger than a width of the plurality of signal conductors; and the width of the plurality of signal conductors is larger than a distance between the plurality of signal conductors and the ground conductor. ### Claim 17 (depends on 10) The electronic device according to claim 10, wherein a length of the first opening in the second direction is larger than an unopposed width of a portion where the plurality of signal conductors and the ground conductor do not face each other; and the unopposed width is larger than a thickness of the circuit portion of the second circuit board. ### Claim 18 An electronic device, comprising: a first circuit board including a first main surface and a second main surface opposite to each other; and a second circuit board including a first portion facing the first main surface, a second portion facing the second main surface, and a bent portion connecting the first portion and the second portion to each other; wherein the second circuit board includes: a circuit portion defining the first portion, the bent portion, and the second portion and having insulating properties; a plurality of signal conductors on the circuit portion, extending in a first direction in which the first portion, the bent portion, and the second portion are connected, and being spaced apart from each other in a second direction orthogonal or substantially orthogonal to the first direction; and a first opening between the plurality of signal conductors when viewed in a thickness direction of the circuit portion; the first opening extends from at least one of the first portion or the second portion to the bent portion; the first portion and the second portion each include a portion not including the first opening between the plurality of signal conductors; and the circuit portion included in the second circuit board has a dielectric loss tangent lower than a dielectric loss tangent of a circuit portion included in the first circuit board. ### Claim 19 An electronic device, comprising: a first circuit board including a first main surface and a second main surface opposite to each other; and a second circuit board including a first portion facing the first main surface, a second portion facing the second main surface, and a bent portion connecting the first portion and the second portion to each other; wherein the second circuit board includes: a circuit portion defining the first portion, the bent portion, and the second portion and having insulating properties; a plurality of signal conductors on the circuit portion, extending in a first direction in which the first portion, the bent portion, and the second portion are connected, and being spaced apart from each other in a second direction orthogonal or substantially orthogonal to the first direction; and a first opening between the plurality of signal conductors when viewed in a thickness direction of the circuit portion; the first opening extends from at least one of the first portion or the second portion to the bent portion; the first portion and the second portion each include a portion not including the first opening between the plurality of signal conductors; a planar antenna conductor is located on the first main surface of the first circuit board; and the second circuit board is connected to the planar antenna conductor. ### Claim 20 An electronic device, comprising: a first circuit board including a first main surface and a second main surface opposite to each other; and a second circuit board including a first portion facing the first main surface, a second portion facing the second main surface, and a bent portion connecting the first portion and the second portion to each other; wherein the second circuit board includes: a circuit portion defining the first portion, the bent portion, and the second portion and having insulating properties; a plurality of signal conductors on the circuit portion, extending in a first direction in which the first portion, the bent portion, and the second portion are connected, and being spaced apart from each other in a second direction orthogonal or substantially orthogonal to the first direction; and a first opening between the plurality of signal conductors when viewed in a thickness direction of the circuit portion; the first opening extends from at least one of the first portion or the second portion to the bent portion; the first portion and the second portion each include a portion not including the first opening between the plurality of signal conductors; the second circuit board includes an auxiliary opening between the plurality of signal conductors when viewed in the thickness direction of the circuit portion of the second circuit board; the auxiliary opening overlaps a vertex of the bent portion; and the auxiliary opening is spaced apart from the first opening and the second opening in the first direction.