# US 11,909,088 B2 · Transmission line member including first and third transmission line portions connected by a second coplanar waveguide portion of reduced thickness and greater width > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,909,088 B2 - Document ID: US11909088B2 - Status: Granted - Kind: B2 - Application number: 17/335,366 - Filed: 2021-06-01 - Published: 2021-09-16 - Granted: 2024-02-20 - Earliest claimed: 2018-12-20 - Assignees: Murata Manufacturing Co., Ltd. - Applicants: Murata Manufacturing Co., Ltd. - Inventors: Shigeru Tago - Web page: https://patentgrep.com/patent/US11909088B2 ## CPC - H01P 3/082: {Multilayer dielectric} - H01P 3/003: {Coplanar lines} - H01P 3/081: {Microstriplines} - H01P 3/088: {Stacked transmission lines} - H01P 5/028: {between strip lines} - H05K 1/02: Details - H05K 1/028: {Bending or folding regions of flexible printed circuits (H05K1/0283 takes precedence)} - H05K 1/0219: {Printed shielding conductors for shielding around or between signal conductors, e.g. coplanar or coaxial printed shielding conductors} - H05K 1/0221: {Coaxially shielded signal lines comprising a continuous shielding layer partially or wholly surrounding the signal lines} - H05K 1/0227: {Split or nearly split shielding or ground planes} - H05K 1/025: {Impedance arrangements, e.g. impedance matching, reduction of parasitic impedance (H05K1/024 and H05K1/0243 take precedence; for semiconductor devices H10W44/20)} - H05K 3/4691: {Rigid-flexible multilayer circuits comprising rigid and flexible layers, e.g. having in the bending regions only flexible layers} - H05K 2201/0191: wherein the thickness of the dielectric plays an important role - H05K 2201/056: Folded around rigid support or component - H05K 2201/0715: provided by an outer layer of PCB - H05K 2201/09027: Non-rectangular flat PCB, e.g. circular - H05K 2201/09036: Recesses or grooves in insulating substrate - H05K 2201/09063: Holes or slots in insulating substrate not used for electrical connections - H05K 2201/09236: Parallel layout - H05K 2201/09309: Core having two or more power planes; Capacitive laminate of two power planes - H05K 2201/09327: Special sequence of power, ground and signal layers in multilayer PCB - H05K 2201/09336: Signal conductors in same plane as power plane - H05K 2201/09618: Via fence, i.e. one-dimensional array of vias - H05K 2201/09663: Divided layout, i.e. conductors divided in two or more parts - H05K 2201/09727: Varying width along a single conductor; Conductors or pads having different widths - H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B) - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS ## Abstract A transmission line member includes a base body extending along a transmission direction of a high-frequency signal, and a first transmission line, a second transmission line, and a third transmission line. The base body includes a first portion including the first transmission line, a second portion including the second transmission line, and a third portion including the third transmission line. The second portion is connected between the first and third portions. A thickness of the second portion is smaller than a thickness of the first and third portions. The second transmission line includes only a conductor pattern extending more in the transmission direction than in a direction of the thickness. ## Claims ### Claim 1 A transmission line member comprising: a base body extending along a transmission direction of a high-frequency signal; and a first transmission line, a second transmission line, and a third transmission in the base body and sequentially connected along the transmission direction; wherein the base body includes: a first portion in which the first transmission line is provided; a second portion in which the second transmission line is provided; and a third portion in which the third transmission line is provided; the first transmission line and the third transmission line include a first signal conductor; the second transmission line includes a second signal conductor; the second portion is connected between the first portion and the third portion; a thickness of the second portion is smaller than a thickness of the first portion and a thickness of the third portion; the second transmission line is a coplanar line and includes only a conductor pattern extending more in the transmission direction than in a direction of the thickness; and a width of the second signal conductor is larger than a width of the first signal conductor. ### Claim 2 (depends on 1) The transmission line member according to claim 1, wherein the first transmission line and the third transmission line are each a stripline including; a first ground conductor and a second ground conductor separated from each other along a thickness direction of the base body; the first signal conductor between the first ground conductor and the second ground conductor; and an interlayer connection conductor connecting the first ground conductor and the second ground conductor to each other and extending in the thickness direction of the base body. ### Claim 3 (depends on 2) The transmission line member according to claim 2, wherein the second transmission line further includes: a third ground conductor; and a fourth ground conductor; the second signal conductor, the third ground conductor, and the fourth ground conductor are at predetermined positions in the thickness direction of the base body; and in the coplanar line, the second signal conductor is sandwiched between the third ground conductor and the fourth ground conductor in a width direction of the base body. ### Claim 4 (depends on 2) The transmission line member according to claim 2, wherein a distance between a side end portion of the interlayer connection conductor of the first portion closest to the second portion and a side end portion of the interlayer connection conductor of the third portion closest to the second portion is about ¼ or less of a wavelength of the high-frequency signal. ### Claim 5 (depends on 2) The transmission line member according to claim 2, further comprising: a fourth portion in which the second transmission line is connected to the first transmission line and a fifth portion in which the second transmission line is connected to the third transmission line; wherein the fourth portion and the fifth portion each include a microstripline including a third signal conductor and a fifth ground conductor separated from each other along the thickness direction of the base body. ### Claim 6 (depends on 5) The transmission line member according to claim 5, wherein a thickness of the fourth portion is smaller than the thickness of the first portion and larger than the thickness of the second portion; and a thickness of the fifth portion is smaller than the thickness of the third portion and larger than the thickness of the second portion. ### Claim 7 (depends on 5) The transmission line member according to claim 5, wherein a width of the third signal conductor is smaller than the width of the second signal conductor and larger than the width of the first signal conductor. ### Claim 8 (depends on 1) The transmission line member according to claim 1, wherein the second portion includes a hole extending in the direction of the thickness thereof and having a smaller thickness than the first portion and the third portion. ### Claim 9 (depends on 1) The transmission line member according to claim 1, wherein the second portion is bent in the thickness direction of the base body. ### Claim 10 (depends on 9) The transmission line member according to claim 9, wherein the second portion is bent in a plurality of different directions at a plurality of different positions. ### Claim 11 (depends on 1) The transmission line member according to claim 1, further comprising: a sixth portion including a sixth transmission line; wherein the sixth transmission line has a same or substantially a same structure as the first transmission line and the third transmission line; and the sixth portion is located at an intermediate position of the second portion. ### Claim 12 (depends on 11) The transmission line member according to claim 11, wherein a principal surface of the first portion orthogonal or substantially orthogonal to the direction of the thickness thereof and a principal surface of the third portion orthogonal or substantially orthogonal to the direction of the thickness thereof are orthogonal or substantially orthogonal to a principal surface of the sixth portion orthogonal or substantially orthogonal to the direction of the thickness thereof. ### Claim 13 (depends on 1) An electronic device comprising: a circuit board; the transmission line member according to claim 1 on the circuit board; and an electronic component on the circuit board. ### Claim 14 (depends on 13) The electronic device according to claim 13, wherein the first transmission line and the third transmission line are each a stripline including; a first ground conductor and a second ground conductor separated from each other along a thickness direction of the base body; the first signal conductor between the first ground conductor and the second ground conductor; and an interlayer connection conductor connecting the first ground conductor and the second ground conductor to each other and extending in the thickness direction of the base body. ### Claim 15 (depends on 14) The electronic device according to claim 14, wherein the second transmission line further includes: a third ground conductor; and a fourth ground conductor; the second signal conductor, the third ground conductor, and the fourth ground conductor are at predetermined positions in the thickness direction of the base body; and in the coplanar line, the second signal conductor is sandwiched between the third ground conductor and the fourth ground conductor in a width direction of the base body. ### Claim 16 (depends on 14) The electronic device according to claim 14, further comprising: a fourth portion in which the second transmission line is connected to the first transmission line and a fifth portion in which the second transmission line is connected to the third transmission line; wherein the fourth portion and the fifth portion each include a microstripline including a third signal conductor and a fifth ground conductor separated from each other along the thickness direction of the base body. ### Claim 17 (depends on 16) The electronic device according to claim 16, wherein a thickness of the fourth portion is smaller than the thickness of the first portion and larger than the thickness of the second portion; and a thickness of the fifth portion is smaller than the thickness of the third portion and larger than the thickness of the second portion. ### Claim 18 (depends on 16) The electronic device according to claim 16, wherein a width of the third signal conductor is smaller than the width of the second signal conductor and larger than the width of the first signal conductor.