CN114071868B - FPC strip line and electronic equipment - Google Patents
FPC strip line and electronic equipment Download PDFInfo
- Publication number
- CN114071868B CN114071868B CN202111312068.XA CN202111312068A CN114071868B CN 114071868 B CN114071868 B CN 114071868B CN 202111312068 A CN202111312068 A CN 202111312068A CN 114071868 B CN114071868 B CN 114071868B
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- bending
- section
- signal
- strip line
- layer
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- 238000005452 bending Methods 0.000 claims abstract description 124
- 239000010410 layer Substances 0.000 claims abstract description 78
- 239000012790 adhesive layer Substances 0.000 claims abstract description 6
- 230000013011 mating Effects 0.000 claims 1
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 239000011889 copper foil Substances 0.000 description 3
- 241001391944 Commicarpus scandens Species 0.000 description 2
- 229920000106 Liquid crystal polymer Polymers 0.000 description 2
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 description 2
- 239000004696 Poly ether ether ketone Substances 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 229920002530 polyetherether ketone Polymers 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/11—Printed elements for providing electric connections to or between printed circuits
- H05K1/118—Printed elements for providing electric connections to or between printed circuits specially for flexible printed circuits, e.g. using folded portions
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0277—Bendability or stretchability details
- H05K1/028—Bending or folding regions of flexible printed circuits
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0296—Conductive pattern lay-out details not covered by sub groups H05K1/02 - H05K1/0295
- H05K1/0298—Multilayer circuits
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Structure Of Printed Boards (AREA)
Abstract
The invention discloses an FPC strip line, which sequentially comprises an upper conductive layer, a first insulating layer, a signal layer, an adhesive layer, a second insulating layer and a lower conductive layer from top to bottom, wherein the FPC strip line comprises a non-bending area and a bending area along the length direction, bonding pads are arranged at two ends of the upper conductive layer or the lower conductive layer along the length direction, the signal layer comprises at least one signal line, the bonding pads are respectively connected with two ends of the signal line through via holes, the signal line width of the bending area is larger than that of the non-bending area, the signal line width of the bending area is widened, and the bending life of the FPC strip line is greatly prolonged.
Description
Technical Field
The invention belongs to the technical field of radio frequency transmission lines, and particularly relates to an FPC (flexible printed circuit) strip line and electronic equipment.
Background
With the development of 5G technology, the radio frequency transmission line in the mobile terminal needs to cover more frequency bands and meet the requirement of low loss. The radio frequency transmission line in special scenes such as bendable mobile phones and notebook computers needs to cross a bending area, and further the radio frequency transmission line is required to have higher return loss and lower insertion loss after being bent for many times. Considering that the radio frequency transmission line may interfere with other radio frequency modules or radio frequency elements, the strip line has upper and lower floors, and can well shield own signals and block signals from the outside.
A flexible circuit board (Flexible Printed Circuit Board), called a flexible board for short, is commonly called an FPC in the industry, and is a printed circuit board made of a flexible insulating base material. The electronic product has the characteristics of free bending, winding, folding and the like, can greatly reduce the volume of the electronic product, and is suitable for the requirements of the development of the electronic product in the high-density, miniaturized and high-reliability directions.
At present, the FPC strip line is easy to break after being bent for many times, and the bending life is low.
Disclosure of Invention
The invention aims to provide an FPC strip line and electronic equipment, which can prolong bending life.
In order to solve the problems, the technical scheme of the invention is as follows:
An FPC strip line sequentially comprises an upper conductive layer, a first insulating layer, a signal layer, an adhesive layer, a second insulating layer and a lower conductive layer from top to bottom;
the FPC strip line comprises a non-bending area and a bending area along the length direction, and bonding pads are arranged at two ends of the upper conductive layer or the lower conductive layer along the length direction;
the signal layer comprises at least one signal wire, the bonding pads are respectively connected with two ends of the signal wire through the through holes, and the width of the signal wire in the bending region is larger than that of the signal wire in the non-bending region.
Preferably, the FPC strip line includes first non-bending region, bending region and second non-bending region in proper order along length direction, the signal line divide into first non-bending section, first matching section, bending section, second matching section and second non-bending section in proper order along length direction, just first non-bending section with first matching section is located first non-bending region, bending section's middle part is located bending region, bending section's both ends are located first non-bending region with second non-bending region respectively, second matching section with second non-bending section is located second non-bending region, bending section's width is greater than first matching section's width, first matching section's width is greater than first non-bending section's width, bending section's width is greater than second matching section's width, second matching section's width is greater than second non-bending section's width.
Preferably, the lengths of the first matching section and the second matching section are quarter wavelengths, the characteristic impedance of the first matching section is a quadratic root value of the product of the characteristic impedance of the first non-bending section and the characteristic impedance of the bending section, and the characteristic impedance of the second matching section is a quadratic root value of the product of the characteristic impedance of the second non-bending section and the characteristic impedance of the bending section.
Preferably, the shapes of the first matching section and the second matching section are rectangular, trapezoid or ladder-shaped.
Preferably, the signal layer includes two signal lines disposed in parallel and insulated from each other.
Preferably, the non-bending region is provided with a plurality of ground holes, the ground holes are connected with the upper conductive layer and the lower conductive layer, and the ground holes are arranged on two sides of the signal line.
Preferably, the signal layer further includes a floor board, and the floor board is disposed on a side surface of the signal lines, and is used for reducing interference between the signal lines and interference of the outside on the signal lines.
Based on the same inventive concept, the invention also provides electronic equipment comprising the FPC strip line.
By adopting the technical scheme, the invention has the following advantages and positive effects compared with the prior art:
1) The invention provides an FPC strip line, which sequentially comprises an upper conductive layer, a first insulating layer, a signal layer, an adhesive layer, a second insulating layer and a lower conductive layer from top to bottom, wherein the FPC strip line comprises a non-bending area and a bending area along the length direction, bonding pads are arranged at two ends of the upper conductive layer or the lower conductive layer along the length direction, the signal layer comprises at least one signal line, the bonding pads are respectively connected with two ends of the signal line through via holes, the signal line width of the bending area is larger than that of the non-bending area, the signal line width of the bending area is widened, and the bending life of the FPC strip line is greatly prolonged.
2) The signal line is sequentially divided into a first non-bending section, a first matching section, a bending section, a second matching section and a second non-bending section along the length direction, the width of the bending section is larger than that of the first matching section, the width of the first matching section is larger than that of the first non-bending section, the width of the bending section is larger than that of the second matching section, the width of the second matching section is larger than that of the second non-bending section, and the matching sections are arranged to increase the impedance bandwidth of the FPC strip line.
Drawings
Fig. 1 is a 3D perspective view of an FPC strip provided by the present invention;
Fig. 2 is a schematic diagram of a signal line structure of an FPC strip line according to the present invention;
fig. 3 is a schematic diagram of a ground hole distribution of an FPC strip line according to the present invention;
fig. 4 is a schematic diagram of a plurality of signal lines of an FPC strip line according to the present invention;
fig. 5 is a schematic diagram of distribution of a signal layer floor of an FPC strip line according to the present invention.
Reference numerals illustrate:
1: an upper conductive layer; 2: a first insulating layer; 3: signal layer: 31: a signal line; 311: a first non-bending section; 312: a first matching section; 313: bending sections; 314: a second matching section; 315: a second non-bending section; 32: a floor; 4: a bonding layer; 5: a second insulating layer; 6: a lower conductive layer; 7: a bonding pad; 8: a ground hole; 9: a via hole; a: a first non-inflection region; b: a bending region; c: a second non-inflection region.
Detailed Description
The following describes in further detail an FPC strip and an electronic device according to the present invention with reference to the drawings and the specific embodiments. Advantages and features of the invention will become more apparent from the following description and from the claims.
Example 1
Referring to fig. 1 to 5, the present embodiment provides an FPC strip line including, in order from top to bottom, an upper conductive layer 1, a first insulating layer 2, a signal layer 3, an adhesive layer 4, a second insulating layer 5, and a lower conductive layer 6;
The FPC strip line comprises a non-bending region and a bending region along the length direction, wherein the materials of an upper conductive layer 1 and a lower conductive layer 6 corresponding to the non-bending region are copper foils, the materials of the upper conductive layer 1 and the lower conductive layer 6 corresponding to the bending region are copper foils or composite conductive films, the composite conductive films sequentially comprise a protective film, copper foils and conductive adhesive from top to bottom, and the composite conductive films are attached to the insulating layer through one side of the conductive adhesive. The materials of the first insulating layer 2 and the second insulating layer 5 are generally the same, PI (polyimide) or LCP (liquid crystal polymer) or MPI (modified polyimide) or PEEK (polyether ether ketone) material is adopted, the bonding layer 4 is a prepreg, and has fluidity in a high-temperature state, and is used for realizing the bonding of the first insulating layer 2 and the second insulating layer 5, and bonding pads 7 are arranged at two ends of the upper conductive layer 1 or the lower conductive layer 6 along the length direction;
The signal layer 3 includes at least one signal line 31, the bonding pad 7 is connected with two ends of the signal line 31 through the via hole 9, and the width of the signal line 31 in the bending region is larger than that of the signal line 31 in the non-bending region, so that the signal line in the bending region is widened, the signal line is not easy to break after bending for a plurality of times, and the bending life of the signal line is greatly prolonged.
As a preferred example of this embodiment, referring to fig. 2, the FPC strip line sequentially includes a first non-bending region a, a bending region B and a second non-bending region C along the length direction, the signal line 31 is sequentially divided into a first non-bending section 311, a first matching section 312, a bending section 313, a second matching section 314 and a second non-bending section 315 along the length direction, the first non-bending section 311 and the first matching section 312 are located in the first non-bending region a, the middle part of the bending section 313 is located in the bending region B, two ends of the bending section 313 are respectively located in the first non-bending region a and the second non-bending region C, the second matching section 314 and the second non-bending section 315 are located in the second non-bending region C, the width of the bending section 313 is greater than the width of the first matching section 312, the width of the first matching section 312 is greater than the width of the first non-bending section 311, the width of the bending section 313 is greater than the width of the second matching section 314, the width of the second matching section 314 is greater than the width of the second non-bending section 315, and the matching section is used for increasing the impedance bandwidth of the FPC strip line;
the two ends of the upper conductive layer 1 along the length direction are respectively provided with a bonding pad 7, the bonding pad 7 on the left is connected with the first non-bending section 311 through the via hole 9, the bonding pad 7 on the right is connected with the second non-bending section 315 through the via hole 9, the lengths of the first matching section 312 and the second matching section 314 are quarter wavelengths, the widths are calculated according to the matching theory of the quarter wavelengths, but the line lengths and the line widths of the first matching section 312 and the second matching section 314 are only theoretical references, and the line widths and the lengths of the matching sections can be properly adjusted according to actual requirements; in this embodiment, the signal line 31 may include only the first matching section 312, the bending section 313 and the second matching section 314, and at this time, the left pad 7 is connected to the first matching section 312 through the via 9, and the right pad 7 is connected to the second matching section 314 through the via.
Preferably, the first matching section 312 and the second matching section 314 are rectangular or trapezoidal or stepped in shape.
As a preferred example of the present embodiment, referring to fig. 3, in the FPC strip line provided in the present embodiment, a plurality of ground holes 8 are provided in the non-bending region, the ground holes 8 are distributed around the signal line 31, and are specifically distributed on two sides of the first non-bending section 311, the first matching section 312, the partial bending section 313, the second matching section 314 and the second non-bending section 315, and the ground holes 8 are connected to the upper conductive layer 1 and the lower conductive layer 6 and are insulated from the signal line 31, so that the flat mode of the strip line can be suppressed, and the interference to the external environment can be reduced.
As a preferred example of the present embodiment, referring to fig. 4, the signal layer includes two parallel signal lines 31 insulated from each other, and the two signal lines 31 have the same structure, and the dimensions can be adjusted according to parameters such as actual frequency, and can be the same or different.
As a preferred example of the present embodiment, referring to fig. 5, the signal layer further includes a floor 32, and the floor 32 is distributed in an area other than the signal lines, so as to reduce interference between the plurality of signal lines and interference of the outside on the signal lines.
The invention provides an FPC strip line, which sequentially comprises an upper conductive layer 1, a first insulating layer 2, a signal layer 3, an adhesive layer 4, a second insulating layer 5 and a lower conductive layer 6 from top to bottom, wherein the FPC strip line comprises a non-bending area and a bending area along the length direction, bonding pads 7 are arranged at two ends of the upper conductive layer 1 or the lower conductive layer 6 along the length direction, the signal layer comprises at least one signal wire 31, the bonding pads 7 are respectively connected with two ends of the signal wire 31 through holes 9, the signal wire width of the bending area is larger than that of the non-bending area, the signal wire width of the bending area is widened, and the bending life of the FPC strip line is greatly prolonged.
Example two
Based on the same inventive concept, the invention also provides an electronic device, which comprises the FPC strip line in the first embodiment.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is within the scope of the appended claims and their equivalents to fall within the scope of the invention.
Claims (6)
1. An FPC strip line is characterized by comprising an upper conductive layer, a first insulating layer, a signal layer, an adhesive layer, a second insulating layer and a lower conductive layer from top to bottom in sequence;
the FPC strip line comprises a non-bending area and a bending area along the length direction, and bonding pads are arranged at two ends of the upper conductive layer or the lower conductive layer along the length direction;
The signal layer comprises at least one signal wire, the bonding pads are respectively connected with two ends of the signal wire through via holes, and the width of the signal wire in the bending region is larger than that of the signal wire in the non-bending region;
The FPC strip line sequentially comprises a first non-bending area, a bending area and a second non-bending area along the length direction, the signal line is sequentially divided into a first non-bending section, a first matching section, a bending section, a second matching section and a second non-bending section along the length direction, the first non-bending section and the first matching section are positioned in the first non-bending area, the middle part of the bending section is positioned in the bending area, two ends of the bending section are respectively positioned in the first non-bending area and the second non-bending area, the second matching section and the second non-bending section are positioned in the second non-bending area, the width of the bending section is larger than that of the first matching section, the width of the first matching section is larger than that of the first non-bending section, the width of the bending section is larger than that of the second matching section, and the width of the second matching section is larger than that of the second non-bending section.
And the lengths of the first matching section and the second matching section are quarter wavelengths, the characteristic impedance of the first matching section is a quadratic root value of the product of the characteristic impedance of the first non-bending section and the characteristic impedance of the bending section, and the characteristic impedance of the second matching section is a quadratic root value of the product of the characteristic impedance of the second non-bending section and the characteristic impedance of the bending section.
2. The FPC strip line of claim 1, wherein the first and second mating segments are rectangular or trapezoidal or stepped in shape.
3. The FPC strip line according to claim 1, wherein the signal layer includes two signal lines disposed in parallel and insulated from each other.
4. The FPC strip line according to claim 1, wherein the non-bending region is provided with a plurality of ground holes connecting the upper conductive layer and the lower conductive layer, the ground holes being arranged on both sides of the signal line.
5. The FPC strip line according to claim 1, wherein the signal layer further comprises a floor provided at a side of the signal lines for reducing interference between the signal lines and interference of the outside on the signal lines.
6. An electronic device comprising the FPC strip line according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111312068.XA CN114071868B (en) | 2021-11-08 | 2021-11-08 | FPC strip line and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111312068.XA CN114071868B (en) | 2021-11-08 | 2021-11-08 | FPC strip line and electronic equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114071868A CN114071868A (en) | 2022-02-18 |
| CN114071868B true CN114071868B (en) | 2024-05-03 |
Family
ID=80274138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111312068.XA Active CN114071868B (en) | 2021-11-08 | 2021-11-08 | FPC strip line and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114071868B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008010310A (en) * | 2006-06-29 | 2008-01-17 | Seiko Epson Corp | Flexible flat cable |
| CN103687290A (en) * | 2013-12-03 | 2014-03-26 | 广州杰赛科技股份有限公司 | Flex-rigid PCB and wiring method and device of signal transmission line of flex-rigid PCB |
| CN104733823A (en) * | 2015-04-14 | 2015-06-24 | 上海安费诺永亿通讯电子有限公司 | Bendable flat transmission line |
| CN105845222A (en) * | 2016-05-17 | 2016-08-10 | 上海安费诺永亿通讯电子有限公司 | Soft strip transmission line |
| CN206422204U (en) * | 2017-01-23 | 2017-08-18 | 苏州维信电子有限公司 | Low-loss tapered transmission lines |
| CN110602868A (en) * | 2019-08-16 | 2019-12-20 | 武汉光迅信息技术有限公司 | Flexible circuit board and corresponding optical module |
| CN111430863A (en) * | 2019-12-16 | 2020-07-17 | 瑞声科技(新加坡)有限公司 | Transmission line and terminal device |
-
2021
- 2021-11-08 CN CN202111312068.XA patent/CN114071868B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008010310A (en) * | 2006-06-29 | 2008-01-17 | Seiko Epson Corp | Flexible flat cable |
| CN103687290A (en) * | 2013-12-03 | 2014-03-26 | 广州杰赛科技股份有限公司 | Flex-rigid PCB and wiring method and device of signal transmission line of flex-rigid PCB |
| CN104733823A (en) * | 2015-04-14 | 2015-06-24 | 上海安费诺永亿通讯电子有限公司 | Bendable flat transmission line |
| CN105845222A (en) * | 2016-05-17 | 2016-08-10 | 上海安费诺永亿通讯电子有限公司 | Soft strip transmission line |
| CN206422204U (en) * | 2017-01-23 | 2017-08-18 | 苏州维信电子有限公司 | Low-loss tapered transmission lines |
| CN110602868A (en) * | 2019-08-16 | 2019-12-20 | 武汉光迅信息技术有限公司 | Flexible circuit board and corresponding optical module |
| CN111430863A (en) * | 2019-12-16 | 2020-07-17 | 瑞声科技(新加坡)有限公司 | Transmission line and terminal device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114071868A (en) | 2022-02-18 |
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