CN114005578A - High-speed FFC winding displacement - Google Patents
High-speed FFC winding displacement Download PDFInfo
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- CN114005578A CN114005578A CN202111280318.6A CN202111280318A CN114005578A CN 114005578 A CN114005578 A CN 114005578A CN 202111280318 A CN202111280318 A CN 202111280318A CN 114005578 A CN114005578 A CN 114005578A
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- 238000006073 displacement reaction Methods 0.000 title claims description 6
- 238000004804 winding Methods 0.000 title claims description 6
- 239000010410 layer Substances 0.000 claims abstract description 268
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 50
- 239000011888 foil Substances 0.000 claims abstract description 50
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000000853 adhesive Substances 0.000 claims abstract description 28
- 230000001070 adhesive effect Effects 0.000 claims abstract description 28
- 239000012790 adhesive layer Substances 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims description 6
- 239000004020 conductor Substances 0.000 claims description 4
- 238000007731 hot pressing Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 15
- 238000010586 diagram Methods 0.000 description 4
- 230000008054 signal transmission Effects 0.000 description 4
- 238000003825 pressing Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
- H01B7/0208—Cables with several layers of insulating material
- H01B7/0225—Three or more layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
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Abstract
The invention relates to a high-speed FFC (flexible flat cable) which comprises a signal layer and a shielding layer; the signal layer comprises a signal wire and insulating plastic; the shielding layer comprises an aluminum foil layer, conductive adhesive, a grounding wire and a first insulating layer; the signal layer and the shielding layer are bonded through the adhesive layer, and the impedance of the FFC flat cable is regulated and controlled through the filled dielectric body. The invention also provides a manufacturing method of the high-speed FFC flat cable, which adjusts the impedance of the FFC flat cable through the distance between the signal and the shielding layer as well as the ground wire, reduces the thickness and increases the flexibility of the wire.
Description
Technical Field
The invention relates to the technical field of transmission lines, in particular to a high-speed FFC (flexible flat circuit) flat cable, which is used for high-speed differential signal transmission among internal devices of a server and utilizes the characteristics of a flexible transmission line and a signal pair of a Flexible Flat Circuit (FFC).
Background
However, in the prior art, one method for transmitting signals between devices inside the server is to use a flat cable, which can be bent 180 degrees. This type of cable is called an FFC or a flexible flat cable. The flexible flat cable can minimize crosstalk between adjacent and opposing signal pairs by adjusting the manner in which the signal pairs and ground wires are arranged.
However, the flexible flat cable FFC in the prior art has the following problems: first, for example, in a flexible flat cable FFC provided with a single signal pair, a ground line and a pair of ground lines of the flexible flat cable FFC are coplanar and spaced apart from each other. It is difficult to maintain a constant impedance and a high-speed signal transmission speed on a transmission line. Second, in the flexible flat cable FFC of the related art, when the flexible printed circuit board FPC is used, signal attenuation is large. Therefore, the spacing of the ground and signal lines also becomes critical to controlling the impedance of the transmission line.
Disclosure of Invention
The invention overcomes the defects of the prior art and provides the high-speed FFC flat cable which has a simple structure, is convenient to prepare and has the performance of promoting differential signal transmission.
In order to achieve the purpose, the invention adopts the technical scheme that: a high-speed FFC flat cable comprises a base layer, a plurality of pairs of signal pairs and at least one grounding wire, wherein the signal pairs and the at least one grounding wire are arranged on the base layer; the base layer comprises a first insulating layer, a second insulating layer, at least one grounding wire arranged on the first insulating layer, and a plurality of signal pairs arranged on the second insulating layer.
In a preferred embodiment of the present invention, the second insulating layer provided with the signal pair is a signal layer, and the first insulating layer provided with the ground wire is a shielding layer; the signal layer and the shielding layer are combined through a connecting layer; an aluminum foil layer, conductive adhesive and a plurality of grounding wires embedded in the insulating layer are arranged in the first insulating layer of the shielding layer; and a plurality of signal pairs are arranged in the second insulating layer of the signal layer, and each signal pair comprises a pair of signal lines arranged at intervals and a plurality of dielectric bodies arranged on the second insulating layer.
In a preferred embodiment of the present invention, the insulating layer includes an insulating layer a and an insulating layer b, an aluminum foil layer and a conductive adhesive are disposed between the insulating layer a and the insulating layer b, and a plurality of ground wires are disposed between the conductive adhesive and the insulating layer b.
In a preferred embodiment of the present invention, the adjacent ground lines are arranged at intervals between the conductive paste and the insulating layer b.
In a preferred embodiment of the present invention, the second insulating layer includes an insulating layer c and an insulating layer d, a plurality of signal lines are disposed between the insulating layer c and the insulating layer d, and a plurality of dielectric bodies are disposed between the insulating layer c and the connecting layer.
In a preferred embodiment of the invention, the bonding layer is an adhesive layer; or/and the grounding wire, the signal wire and the dielectric body are arranged in a relatively staggered manner.
In a preferred embodiment of the present invention, the first insulating layer and the second insulating layer are made of insulating plastic.
In a preferred embodiment of the present invention, the FFC bus line corresponds to the center distance W of the signal line, corresponds to the single width W1 of the signal line, and corresponds to the single thickness T1 of the signal line; the two signal lines form a signal pair, and the signal pair is a differential signal of the FFC flat cable; the distance T between the aluminum foil and the signal wire, the center distance W2 between the signal wire and the grounding wire and the dielectric body are filled; the requirement of impedance is met by adjusting one or more of center distance W, single width W1, single thickness T1, distance T, center distance W2 and medium bodies.
In a preferred embodiment of the invention, the impedance Z is setdiffOc of the distance T between the signal pair and the aluminum foil; or/and, impedance ZdiffOc of the center distance W2 between the signal line and the ground line; or/and, impedance ZdiffOc signal to the spacing W between conductors; or/and the single width W1 and the single thickness T1 of the signal wire; or/and, the insulating dielectric coefficient between the aluminum foil and the signal pair, the insulating dielectric coefficient between the ground wire and the signal pair and the filling of the signal layer and the shielding layer bonding medium body; satisfy Z among FFC winding displacementdiff=85±5 ohm or Zdiff=100 ± 5 ohms.
In a preferred embodiment of the present invention, a method for manufacturing a high-speed FFC flat cable comprises: the insulating layer c, the signal line and the insulating layer d in the signal layer are formed by hot pressing; the insulating layer a, the aluminum foil, the ground wire and the insulating layer b in the shielding layer are bonded through conductive adhesive; the signal layer and the shielding layer are bonded through the adhesive layer.
The invention solves the defects existing in the background technology, and has the beneficial effects that:
the invention discloses an improved impedance flexible transmission line which can be used for high-speed signal transmission of internal equipment of a server; it can also be used with a PCB board, with a scheme of signal and ground lines arranged on a base layer that facilitates the transmission of differential signals through transmission lines.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is a schematic structural view of an end section of a shield layer of a medium-high speed FFC bus bar according to a preferred embodiment of the present invention;
fig. 2 is a schematic structural view of an end section of a signal layer of a medium-high speed FFC bus according to a preferred embodiment of the present invention;
fig. 3 is a schematic structural view of an end section of a medium-high speed FFC bus bar according to a preferred embodiment of the present invention (two pairs of signal pairs and one ground line are fixedly arranged);
fig. 4 is a first structural schematic diagram (a first structural schematic diagram of three pairs of signal pairs and three ground wires in a fixed arrangement) of an end section of a high-speed FFC flat cable in a second preferred embodiment of the present invention;
fig. 5 is a second structural schematic diagram (a schematic diagram of a structure of three pairs of signal pairs and three ground lines in a fixed arrangement) of an end section of a high-speed FFC flat cable in a second preferred embodiment of the present invention;
fig. 6 is a schematic structural view of an end section of a high-speed FFC flat cable in a third preferred embodiment of the present invention (a schematic structural view of six pairs of signal pairs and seven ground wires in a fixed arrangement);
fig. 7 is a schematic structural view of an end section of a high-speed FFC bus bar in a fourth preferred embodiment of the present invention (a schematic structural view of twelve pairs of signal pairs and thirteen ground wires in a fixed arrangement);
fig. 8 is an electromagnetic simulation test chart of differential impedance of a high-speed FFC bus line in the second preferred embodiment of the present invention;
in the figure: 1-insulating layer a, 201-aluminum foil layer, 3-conductive adhesive, 401-grounding wire, 5-insulating layer b, 6-adhesive layer, 7-insulating layer c, 8-signal wire, 801-signal pair, 9-insulating layer d, 10-dielectric body, W-signal pair center distance, T-aluminum foil layer and signal pair distance, W1-signal pair single width, T1-signal pair single thickness, and W2-signal wire and grounding wire center distance.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings and examples, which are simplified schematic drawings and illustrate only the basic structure of the invention in a schematic manner, and thus show only the constituents relevant to the invention.
It should be noted that, if directional indications (such as up, down, bottom, top, etc.) are involved in the embodiment of the present invention, the directional indications are only used for explaining the relative position relationship, motion situation, etc. of each component in a certain posture, and if the certain posture is changed, the directional indications are changed accordingly. The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Unless expressly stated or limited otherwise, the terms "disposed," "connected," and "connected" are intended to be inclusive and mean, for example, that there may be a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1 to 6, a high-speed FFC cable includes a base layer, and a plurality of signal pairs 801 and at least one ground line 401 disposed on the base layer; the base layer comprises a first insulating layer, a second insulating layer, at least one grounding wire 401 arranged on the first insulating layer, and a plurality of signal pairs 801 arranged on the second insulating layer; the first insulating layer and the second insulating layer are made of insulating plastic. The second insulating layer provided with the signal pair 801 is a signal layer, and the first insulating layer provided with the grounding wire 401 is a shielding layer; the signal layer and the shielding layer are combined through a bonding layer, and the bonding layer adopts an adhesive layer 6. An aluminum foil layer 201, conductive adhesive 3 and a plurality of grounding wires 401 embedded in the insulating layer are arranged in the insulating layer I of the shielding layer; and a plurality of signal pairs 801 are arranged in the second insulating layer of the signal layer, and each signal pair 801 comprises a pair of signal lines 8 arranged at intervals and a plurality of dielectric bodies 10 arranged on the second insulating layer. The insulating layer I comprises an insulating layer a1 and an insulating layer b5, an aluminum foil layer 201 and a conductive adhesive 3 are arranged between the insulating layer a1 and the insulating layer b5, and a plurality of grounding wires 401 are arranged between the conductive adhesive 3 and the insulating layer b 5. Adjacent ground lines 401 are arranged at intervals between the conductive paste 3 and the insulating layer b 5. The insulating layer II comprises an insulating layer c7 and an insulating layer d9, a plurality of signal lines 8 are arranged between the insulating layer c7 and the insulating layer d9, and a plurality of dielectric bodies 10 are arranged between the insulating layer c7 and the connecting layer. The grounding wire 401, the signal wire 8 and the dielectric body 10 are arranged in a relatively staggered manner.
The FFC flat cable conforms to the center distance W of the signal wire, the single width W1 of the signal wire and the single thickness T1 of the signal wire; the two signal lines 8 form a signal pair 801, and the signal pair 801 is a differential signal of an FFC (flexible flat cable); the distance T between the aluminum foil layer and the signal wire, the center distance W2 between the signal wire and the grounding wire and the filling medium body 10 are met; the impedance requirement is satisfied by adjusting one or more of the center distance W, the single width W1, the single thickness T1, the distance T, the center distance W2 and the medium body 10. W =0.7 to 1.0 mm; w1=0.2 to 0.4 mm; t1=0.06 to 0.12 mm; t =0.15 to 0.35 mm; w2=0.55 to 0.12 mm; the dielectric constant of the dielectric body is more than 2.2, and the dielectric loss of the dielectric body is less than 0.06.
By setting the impedance ZdiffOc of the distance T between the signal pair and the aluminum foil; or/and, impedance ZdiffOc of the center distance W2 between the signal line and the ground line; or/and, impedance ZdiffOc signal to the spacing W between conductors; or/and, a single width W1 of the signal line and a signalWire individual thickness T1; or/and, the insulating dielectric coefficient between the aluminum foil and the signal pair, the insulating dielectric coefficient between the ground wire and the signal pair and the filling of the special medium body 10 bonded with the signal layer and the shielding layer; satisfy Z among FFC winding displacementdiff=85 ± 5 ohm or Zdiff=100 ± 5 ohms.
ZdiffRepresenting differential impedance (in Ω); e is the base of the natural logarithm, Z0Represents the single-ended characteristic impedance when uncoupled, W represents the distance between the signals; t represents the thickness of the medium between the signal and return path planes; w1 represents line width (in mils), T1 represents metal thickness (in mils),
represents the dielectric constant. The impedance of the FFC flat cable is adjusted through the distance between the signal and the shielding layer and the distance between the signal and the ground wire, the thickness is reduced, and the flexibility of the wire is improved.
Example one
As shown in fig. 1 to 4, a high-speed FFC bus includes an insulating layer a1, an aluminum foil layer 201, a conductive adhesive 3, a ground line 401, an insulating layer b5, an adhesive layer 6, an insulating layer c7, a pair of signal pairs 801, an insulating layer 9, and a dielectric body 10. The first insulating layer and the second insulating layer are made of insulating plastic.
A grounding wire 401 is pressed on the aluminum foil layer 201 through the conductive adhesive 3 and the insulating layer b 5; two signal lines 8 spaced apart from each other in the pair of signal pairs 801 are thermocompression bonded to each other through an insulating layer c7 and an insulating layer 9, and a dielectric member 10 is provided on the insulating layer c 7. The dielectric body 10 is disposed correspondingly outside the insulating layer c7 at the interval between the two signal lines 8. Ensuring the size of the center distance W of the signal wire 8, firstly ensuring the sizes of the single width W1 and the single thickness T1 of the signal wire; then the aluminum foil is pressed by the insulating layer a1, the aluminum foil layer 201, the conductive adhesive 3, the grounding wire 401, the insulating layer b5, the adhesive layer 6, the insulating layer c7, the pair of signal pairs 801, the insulating layer 9 and the dielectric body 10 arranged on the insulating layer c7, so as to ensure that the aluminum foil is pressedThe layer and signal pair spacing T and the center-to-center distance W2 of the signal and ground lines. When the sizes of the center distance W of the signal pair, the width W1 of a single signal pair, the center distance W2 of the signal wire and the grounding wire, the distance T between the aluminum foil layer and the signal pair and the thickness T1 of the single signal pair are determined, the impedance Z of the high-speed FFC flat cable can be obtaineddiff. When the aluminum foil 2 and the ground wire 4 are completely pressed, the impedance Z of the high-speed FFC flat cable can be effectively ensureddiff，I.e. the parameters of the impedance can be stabilized within the specified ranges. An arrangement of signal and ground lines disposed on a base layer that facilitates transmission of differential signals through the transmission line.
Example two
As shown in fig. 5 and 8, in the first embodiment, the high-speed FFC flat cable includes an insulating layer a1, an aluminum foil layer 201, a conductive adhesive 3, three ground wires 401, an insulating layer b5, an adhesive layer 6, an insulating layer c7, three pairs of signal pairs 801, an insulating layer 9, and a dielectric body 10. The first insulating layer and the second insulating layer are made of insulating plastic.
Three grounding wires 401 arranged at intervals are pressed on the aluminum foil layer 201 through the conductive adhesive 3 and the insulating layer b 5; six signal lines 8 arranged at intervals between the three pairs of signal pairs 801 are thermocompression bonded to the insulating layer 9 via the insulating layer c7, and the dielectric member 10 is provided on the insulating layer c 7. The dielectric body 10 is disposed correspondingly outside the insulating layer c7 at the intervals between the six signal lines 8. Ensuring the size of the center distance W of the signal wire 8, firstly ensuring the sizes of the single width W1 and the single thickness T1 of the signal wire; then, the aluminum foil layer and the signal pair spacing T and the center distance W2 between the signal line and the grounding line are ensured by pressing the insulating layer a1, the aluminum foil layer 201, the conductive adhesive 3, the three grounding lines 401, the insulating layer b5, the adhesive layer 6, the insulating layer c7, the three pairs of signal pairs 801, the insulating layer 9 and the dielectric body 10 arranged on the insulating layer c 7. When the sizes of the center distance W of the signal pair, the width W1 of a single signal pair, the center distance W2 of the signal wire and the grounding wire, the distance T between the aluminum foil layer and the signal pair and the thickness T1 of the single signal pair are determined, the impedance Z of the high-speed FFC flat cable can be obtaineddiff. When the aluminum foil 2 and the ground wire 4 are completely pressed, the impedance Z of the high-speed FFC flat cable can be effectively ensureddiff，I.e. the parameters of the impedance can be stabilized within the specified ranges. ClothA scheme of signal lines and ground lines disposed on a base layer that facilitates transmission of differential signals through a transmission line.
As shown in the electromagnetic simulation test chart of the differential impedance of the high-speed FFC flat cable in fig. 8, the tolerance of the impedance of the flat cable in the prior art is generally controlled by 5%, and the simulated differential impedance fluctuation of the high-speed FFC flat cable in the present invention is smaller by 2%.
EXAMPLE III
As shown in fig. 6, in the first embodiment, a high-speed FFC bus includes an insulating layer a1, an aluminum foil layer 201, a conductive adhesive 3, seven ground wires 401, an insulating layer b5, an adhesive layer 6, an insulating layer c7, six pairs of signal pairs 801, an insulating layer 9, and a dielectric body 10. The first insulating layer and the second insulating layer are made of insulating plastic.
Seven grounding wires 401 arranged at intervals are pressed on the aluminum foil layer 201 through the conductive adhesive 3 and the insulating layer b 5; twelve signal lines 8 arranged at intervals of six pairs of signal pairs 801 are thermocompression bonded to an insulating layer 9 via an insulating layer c7, and a dielectric member 10 is provided on the insulating layer c 7. The dielectric body 10 is disposed correspondingly to the outside of the insulating layer c7 at the intervals between the twelve signal lines 8. Ensuring the size of the center distance W of the signal wire 8, firstly ensuring the sizes of the single width W1 and the single thickness T1 of the signal wire; then, the aluminum foil layer and the signal pair spacing T and the center distance W2 of the signal line and the grounding line are ensured by pressing the insulating layer a1, the aluminum foil layer 201, the conductive adhesive 3, the seven grounding lines 401, the insulating layer b5, the adhesive layer 6, the insulating layer c7, the six pairs of signal pairs 801, the insulating layer 9 and the dielectric body 10 arranged on the insulating layer c 7. When the sizes of the center distance W of the signal pair, the width W1 of a single signal pair, the center distance W2 of the signal wire and the grounding wire, the distance T between the aluminum foil layer and the signal pair and the thickness T1 of the single signal pair are determined, the impedance Z of the high-speed FFC flat cable can be obtaineddiff. When the aluminum foil 2 and the ground wire 4 are completely pressed, the impedance Z of the high-speed FFC flat cable can be effectively ensureddiff，I.e. the parameters of the impedance can be stabilized within the specified ranges. An arrangement of signal and ground lines disposed on a base layer that facilitates transmission of differential signals through the transmission line.
Example four
As shown in fig. 7, in addition to the first embodiment, the high-speed FFC flat cable includes an insulating layer a1, an aluminum foil layer 201, a conductive adhesive 3, thirteen ground wires 401, an insulating layer b5, an adhesive layer 6, an insulating layer c7, twelve pairs of signal pairs 801, an insulating layer 9, and a dielectric body 10. The first insulating layer and the second insulating layer are made of insulating plastic.
Thirteen grounding wires 401 arranged at intervals are pressed on the aluminum foil layer 201 through the conductive adhesive 3 and the insulating layer b 5; twelve signal lines 8 arranged at intervals between twelve pairs of signal pairs 801 are thermocompression bonded to an insulating layer 9 via an insulating layer c7, and a dielectric member 10 is provided on the insulating layer c 7. The dielectric body 10 is disposed correspondingly outside the insulating layer c7 at the intervals between twenty-four signal lines 8. Ensuring the size of the center distance W of the signal wire 8, firstly ensuring the sizes of the single width W1 and the single thickness T1 of the signal wire; then, the aluminum foil layer and the signal pair spacing T and the center distance W2 of the signal line and the grounding line are ensured by pressing the insulating layer a1, the aluminum foil layer 201, the conductive adhesive 3, the thirteen grounding lines 401, the insulating layer b5, the adhesive layer 6, the insulating layer c7, the twelve pairs of signal pairs 801, the insulating layer 9 and the dielectric body 10 arranged on the insulating layer c 7. When the sizes of the center distance W of the signal pair, the width W1 of a single signal pair, the center distance W2 of the signal wire and the grounding wire, the distance T between the aluminum foil layer and the signal pair and the thickness T1 of the single signal pair are determined, the impedance Z of the high-speed FFC flat cable can be obtaineddiff. When the aluminum foil 2 and the ground wire 4 are completely pressed, the impedance Z of the high-speed FFC flat cable can be effectively ensureddiff，I.e. the parameters of the impedance can be stabilized within the specified ranges. An arrangement of signal and ground lines disposed on a base layer that facilitates transmission of differential signals through the transmission line.
EXAMPLE five
A method for preparing a high-speed FFC flat cable.
The insulating layer c7, the signal line 8 and the insulating layer d9 in the signal layer are formed by hot pressing; the insulating layer a1, the aluminum foil layer 201, the grounding wire 401 and the insulating layer b5 in the shielding layer are bonded by the conductive adhesive 3; the signal layer and the shield layer are bonded by an adhesive layer 6. The manufacturing method of the high-speed FFC flat cable adjusts the impedance of the FFC flat cable through the distance between the signal wire 8 and the shielding layer as well as the grounding wire 401, reduces the thickness and increases the flexibility of the wire.
The FFC flat cable conforms to the center distance W of the signal wire, the single width W1 of the signal wire and the single thickness T1 of the signal wire; the two signal lines form a signal pair, and the signal pair is a differential signal of the FFC flat cable; the distance T between the aluminum foil and the signal wire, the center distance W2 between the signal wire and the grounding wire and a filling medium body are met; the requirement of impedance is met by adjusting one or more of center distance W, single width W1, single thickness T1, distance T, center distance W2 and medium bodies.
By setting the impedance ZdiffOc of the distance T between the signal pair and the aluminum foil; or/and, impedance ZdiffOc of the center distance W2 between the signal line and the ground line; or/and, impedance ZdiffOc signal to the spacing W between conductors; or/and the single width W1 and the single thickness T1 of the signal wire; or/and the insulating dielectric coefficient between the aluminum foil layer 201 and the signal pair, the insulating dielectric coefficient between the grounding wire 401 and the signal pair and the filling of the signal layer and the shielding layer bonding medium body 10; satisfy Z among FFC winding displacementdiff=85 ± 5 ohm or Zdiff=100 ± 5 ohms.
The working principle is as follows:
as shown in fig. 1 to 7, the high-speed FFC bus disclosed in the present invention has an FFC base, and utilizes a first insulating layer and a second insulating layer (i.e. a top elongated supporting plastic and a bottom elongated supporting plastic) opposite to each other. The first insulating layer and the second insulating layer are used as a base layer, a plurality of pairs of signal pairs are fixedly arranged on the base layer, and a plurality of grounding wires are fixedly arranged on the first insulating layer and are communicated through a conductive adhesive and an aluminum foil layer. The ground lines are associated with only signal pairs, i.e., differential signal pairs. The ground lines are spaced wider from each other than the signal pairs of each differential signal (the spacing of the two ground lines 4 and the contrast of the signal W), but are spaced closer from each other than the spacing between adjacent differential signal pairs. In this way, Z in the FFC bus line can be satisfied reliablydiff=85 ± 5 ohm or Zdiff=100 ± 5 ohms.
In light of the foregoing description of the preferred embodiment of the present invention, it is to be understood that various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. A high-speed FFC flat cable comprises a base layer, a plurality of pairs of signal pairs and at least one grounding wire, wherein the signal pairs and the at least one grounding wire are arranged on the base layer; the method is characterized in that: the base layer comprises a first insulating layer, a second insulating layer, at least one grounding wire arranged on the first insulating layer, and a plurality of signal pairs arranged on the second insulating layer.
2. The high speed FFC flex cable of claim 1 wherein: the second insulating layer provided with the signal pairs is a signal layer, and the first insulating layer provided with the grounding wire is a shielding layer; the signal layer and the shielding layer are combined through a connecting layer; an aluminum foil layer, conductive adhesive and a plurality of grounding wires embedded in the insulating layer are arranged in the first insulating layer of the shielding layer;
and a plurality of signal pairs are arranged in the second insulating layer of the signal layer, and each signal pair comprises a pair of signal lines arranged at intervals and a plurality of dielectric bodies arranged on the second insulating layer.
3. The high speed FFC flex cable of claim 2 wherein: the insulating layer I comprises an insulating layer a and an insulating layer b, an aluminum foil layer and conductive adhesive are arranged between the insulating layer a and the insulating layer b, and a plurality of grounding wires are arranged between the conductive adhesive and the insulating layer b.
4. The high speed FFC ribbon cable of claim 3 further comprising: the adjacent grounding wires are arranged between the conductive adhesive and the insulating layer b at intervals.
5. The FFC flex cable of claim 4, wherein: the second insulating layer comprises an insulating layer c and an insulating layer d, a plurality of signal lines are arranged between the insulating layer c and the insulating layer d, and a plurality of dielectric bodies are arranged between the insulating layer c and the connecting layer.
6. The high speed FFC flex cable of claim 1 wherein: the bonding layer is an adhesive layer;
or/and the grounding wire, the signal wire and the dielectric body are arranged in a relatively staggered manner.
7. The high speed FFC flex cable of claim 1 wherein: the first insulating layer and the second insulating layer are made of insulating plastic.
8. The high speed FFC flex cable of claim 2 wherein:
the FFC bus line conforms to the center-to-center distance W of the signal lines,
corresponding to the single width W1 of the signal line,
a single thickness T1 corresponding to the signal line;
the two signal lines form a signal pair, and the signal pair is a differential signal of the FFC flat cable; in accordance with the pitch T of the aluminum foil and the signal lines,
according to the center distance W2 between the signal wire and the grounding wire,
and filling the dielectric body;
the requirement of impedance is met by adjusting one or more of center distance W, single width W1, single thickness T1, distance T, center distance W2 and medium bodies.
9. The high speed FFC flex cable of claim 1 wherein:
by setting the impedance ZdiffOc of the distance T between the signal pair and the aluminum foil;
or/and, impedance ZdiffOc of the center distance W2 between the signal line and the ground line;
or/and, impedance ZdiffOc signal to the spacing W between conductors;
or/and the single width W1 and the single thickness T1 of the signal wire;
or/and, the insulating dielectric coefficient between the aluminum foil and the signal pair, the insulating dielectric coefficient between the ground wire and the signal pair and the filling of the signal layer and the shielding layer bonding medium body 10;
satisfy Z among FFC winding displacementdiff=85 ± 5 ohm or Zdiff=100 ± 5 ohms.
10. The method for preparing a high-speed FFC flat cable according to any one of claims 1 to 8, wherein the method comprises the following steps: the insulating layer c, the signal line and the insulating layer d in the signal layer are formed by hot pressing; the insulating layer a, the aluminum foil, the ground wire and the insulating layer b in the shielding layer are bonded through conductive adhesive; the signal layer and the shielding layer are bonded through the adhesive layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111280318.6A CN114005578B (en) | 2021-11-01 | High-speed FFC winding displacement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111280318.6A CN114005578B (en) | 2021-11-01 | High-speed FFC winding displacement |
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| CN114005578A true CN114005578A (en) | 2022-02-01 |
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