EP2549490B1 - Transmission unit with reduced crosstalk signal - Google Patents
Transmission unit with reduced crosstalk signal Download PDFInfo
- Publication number
- EP2549490B1 EP2549490B1 EP20110174312 EP11174312A EP2549490B1 EP 2549490 B1 EP2549490 B1 EP 2549490B1 EP 20110174312 EP20110174312 EP 20110174312 EP 11174312 A EP11174312 A EP 11174312A EP 2549490 B1 EP2549490 B1 EP 2549490B1
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- conductor
- sheath
- transmission unit
- surrounded
- earth
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- 230000005540 biological transmission Effects 0.000 title claims description 73
- 239000004020 conductor Substances 0.000 claims description 189
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 239000011888 foil Substances 0.000 claims description 2
- 230000005684 electric field Effects 0.000 description 12
- 239000003989 dielectric material Substances 0.000 description 11
- 230000008054 signal transmission Effects 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000012141 concentrate Substances 0.000 description 5
- 230000000007 visual effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
-
- 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
-
- 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
-
- 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
- H01B7/08—Flat or ribbon cables
Definitions
- the present invention relates to a transmission unit, and more particularly to a transmission unit that includes conductors surrounded by sheaths of different dielectric coefficients, so that a difference in dielectric property exists between the conductors to enable reduction of crosstalk occurred during high-speed signal transmission over the transmission unit.
- VCD video compact disk
- DVD digital versatile disk
- HDTV high-definition digital television
- video call and video conference all have been introduced into people's daily life.
- Most of the currently available audio video (AV) systems process voice and image information in a completely digitalized manner to meet the newest technological trend.
- Different specifications and standards for AV systems have been constantly established, revised and updated, so that the AV systems can provide audio and visual signals with higher quality and can be applied to more different application fields to meet consumers' demands.
- Digital signals must be transmitted at further increased speed without the need of compression.
- HDMI high-definition multimedia interface
- DVI digital visual interface
- DisplayPort Through digitized transmission of signals via these interfaces, images of enhanced quality can be displayed on electronic devices.
- the above-mentioned interfaces can be electrically connected to an adapter, a set-top box, a DVD player, a personal computer, a video game console, an integrated amplifier, a digital stereo system, etc. to enable long distance transmission of high quality signals at high speed, and are therefore widely welcome among consumers and can be seen everywhere now.
- the use of these standardized digital video interfaces to transmit video signals at high speed can provide better visual effect.
- Most cables for DisplayPort connector, DVI connector and HDMI connector are round cables or flat cables. Inside these cables, there is a plurality of metal conductors, which are respectively surrounded by an insulating layer to prevent short circuit between the metal signal conductors. Each signal pair is further surrounded by a metal shield to prevent crosstalk between the signal pair. While the metal shield can reduce the crosstalk between the signal pair, it makes the whole cable stiff, heavy and inconvenient for use. Further, to connect the cable to the terminals of the connector, it is necessary to strip a length of the metal shield from the signal pair. By doing this, scraps would be produced. Moreover, cables with conductors surrounded by metal shields could not be used with piercing terminals to enable automated assembling of cables.
- the transmission unit with reduced crosstalk signal includes a first conductor group, which includes at least one first conductor surrounded by a first sheath and at least one second conductor surrounded by a second sheath.
- the first and the second conductor are axially arranged corresponding to one another.
- the first sheath has a dielectric coefficient higher than that of the second sheath.
- the transmission unit including the first conductor surrounded by the high-dielectric first sheath can reduce the crosstalk occurred during high-speed signal transmission over the transmission unit.
- Fig. 1 is a cross sectional view of a transmission unit with reduced crosstalk signal according to a first embodiment of the present invention.
- the present invention is also briefly referred as a transmission unit and generally denoted by reference numeral 1 herein.
- the transmission unit 1 of the present invention includes a first conductor group 11.
- the first conductor group 11 includes at least one first conductor 111 surrounded by a first sheath 1111 and at least one second conductor 112 surrounded by a second sheath 1121.
- the first and the second conductor 111, 112 are axially parallelly arranged side by side.
- the first sheath 1111 has a dielectric coefficient higher than that of the second sheath 1121.
- the first conductor 111 is a signal conductor
- the second conductor 112 is an earth conductor.
- Fig. 2 is a cross sectional view of a transmission unit 1 according to a second embodiment of the present invention.
- the transmission unit 1 includes a first conductor group 11, a second conductor group 12 and a third conductor group 13. Since the first conductor group 11 is structurally similar to that in the first embodiment, it is not repeated described in details herein.
- the second conductor group 12 includes at least one third conductor 121 surrounded by a first sheath 1111 and at least one fourth conductor 122 surrounded by a second sheath 1121.
- the third conductor group 13 includes at least one fifth conductor 131 surrounded by a first sheath 1111 and at least one sixth conductor 132 surrounded by a second sheath 1121.
- the second embodiment there is a difference between the dielectric values of the first sheath 1111 and the second sheath 1121. Since a high-dielectric material has good ability to concentrate electric field, the use of a low-dielectric material for one conductor in each of the signal pairs can reduce electric field concentration and accordingly, reduce crosstalk noise interference between the signal pairs.
- Fig. 3 is a cross sectional view of a transmission unit 1 according to a third embodiment of the present invention.
- the transmission unit 1 includes a first conductor group 11 having at least one first conductor 111 surrounded by a first sheath 1111 and at least one second conductor 112; a second conductor group 12 having at least one third conductor 121 surrounded by a first sheath 1111 and at least one fourth conductor 122; a third conductor group 13 having at least one fifth conductor 131 surrounded by a first sheath 1111 and at least one sixth conductor 132; and a second sheath 1121 surrounding all the first sheaths 1111 and the second, fourth and sixth conductors 112, 122, 132.
- the transmission unit 1 includes a first conductor group 1 having at least one first conductor 111 surrounded by a first sheath 1111 and at least one second conductor 112 surrounded by a second sheath 1121; a second conductor group 12 having at least one third conductor 121 surrounded by a first sheath 1111 and at least one fourth conductor 122 surrounded by a second sheath 1121; a first earth conductor 14; a second earth conductor 15; a third earth conductor 16; and a third sheath 1131.
- the first and second conductor groups 11, 12 can be differential signal pairs.
- the second earth conductor 15 is arranged between the first and the second conductor group 11, 12; the first earth conductor 14 is arranged to one side of the first conductor group 11 opposite to the second earth conductor 15; and the third earth conductor 16 is arranged to one side of the second conductor group 12 opposite to the second earth conductor 15.
- the third sheath 1113 surrounds all the first and second sheaths 1111, 1121 and the first, second and third earth conductors 14, 15, 16.
- the first and the second sheath 1111, 1121 may have the same dielectric coefficient, which is higher than that of the third sheath 1113.
- the transmission unit 1 includes differential signal pairs and earth conductors. There is a difference between the dielectric values of the first and second sheaths 1111, 1121 and the third sheath 1113. Since a high-dielectric material has good ability to concentrate electric field, the use of a low-dielectric material for one conductor in each of the signal pairs can reduce electric field concentration and accordingly, reduce crosstalk noise interference between the signal pairs.
- Fig. 5 is a cross sectional view of a transmission unit 1 according to a fifth embodiment of the present invention.
- the transmission unit 1 includes a first conductor group 11 having at least one first conductor 111 surrounded by a first sheath 1111 and at least one second conductor 112 surrounded by a second sheath 1121; a second conductor group 12 having at least one third conductor 121 surrounded by a first sheath 1111 and at least one fourth conductor 122 surrounded by a second sheath 1121; a third conductor group 13 having at least one fifth conductor 131 surrounded by a first sheath 1111 and at least one sixth conductor 132 surrounded by a second sheath 1121; and a third sheath 1113 surrounding all the first sheaths 1111 and second sheaths 1121. All the first sheaths 1111 have a dielectric coefficient higher than that of the second sheaths 1121.
- the dielectric values of the first, the second and the third sheath 1111, 1121, 1113 There are differences between the dielectric values of the first, the second and the third sheath 1111, 1121, 1113. Since a high-dielectric material has good ability to concentrate electric field, the use of a low-dielectric material for one conductor in each of the signal pairs can reduce electric field concentration and accordingly, reduce crosstalk noise interference between the signal pairs.
- Fig. 6 is a cross sectional view of a transmission unit 1 according to a sixth embodiment of the present invention.
- the transmission unit 1 includes a first conductor group 11 having at least one first conductor 111 surrounded by a first sheath 1111 and at least one second conductor 112; and a second sheath 1121 surrounding the first sheath 1111 and the second conductor 112.
- the first and the second conductor 111, 112 are axially arranged corresponding to one another.
- Fig. 7 is a cross sectional view of a transmission unit 1 according to a seventh embodiment of the present invention.
- the transmission unit 1 includes a first conductor group 11, a second conductor group 12, a first earth conductor 14, a second earth conductor 15, and a third earth conductor 16.
- the first conductor group 11 includes at least one first conductor 111 and at least one second conductor 112, which are respectively surrounded by a first sheath 1111;
- the second conductor group 12 includes at least one third conductor 121 and at least one fourth conductor 122, which are respectively surrounded by a first sheath 1111.
- the first and the second conductor group 11, 12 are differential signal pairs.
- the second earth conductor 15 is arranged between the first and the second conductor group 11, 12; the first earth conductor 14 is arranged to one side of the first conductor group 11 opposite to the second earth conductor 15; and the third earth conductor 16 is arranged to one side of the second conductor groups 12 opposite to the second earth conductor 15.
- the first, second and third earth conductors 14, 15, 16 are respectively surrounded by a second sheath 1121.
- the first sheaths 1111 have a dielectric coefficient higher than that of the second sheaths 1121.
- the transmission unit 1 includes differential signal pairs and earth conductors. There is a difference between the dielectric values of the first sheaths 1111 and the second sheaths 1121. Since a high-dielectric material has good ability to concentrate electric field, the use of a low-dielectric material for one conductor in each of the signal pairs can reduce electric field concentration and accordingly, reduce crosstalk noise interference between the signal pairs.
- Fig. 8 is a cross sectional view of a transmission unit 1 according to an eighth embodiment of the present invention.
- the transmission unit 1 in the eighth embodiment is generally structurally similar to the seventh embodiment, except for a third sheath 1113 that surrounds all the first and second sheaths 1111, 1121.
- the transmission unit 1 includes differential signal pairs and earth conductors. There are differences between the dielectric values of the first sheaths 1111, the second sheaths 1121, and the third sheaths 1113. Since a high-dielectric material has good ability to concentrate electric field, the use of a low-dielectric material for one conductor in each of the signal pairs can reduce electric field concentration and accordingly, reduce crosstalk noise interference between the signal pairs.
- Fig. 9 is a cross sectional view of a transmission unit 1 according to a ninth embodiment of the present invention.
- the transmission unit 1 in the ninth embodiment is generally structurally similar to the eighth embodiment, except that the first and the second conductor group 11, 12 are respectively surrounded by a fourth sheath 1114 before being further surrounded by the third sheath 1113 along with the first, second and third earth conductors 14, 15, 16.
- the fourth sheath 1114 is aluminum foil in the ninth embodiment.
- Fig. 10 is a perspective view of a transmission unit 1 according to a tenth embodiment of the present invention.
- the transmission unit 1 in the tenth embodiment is generally structurally similar to the first embodiment, except that the at least one first conductor 111 and the at least one second conductor 112 are twisted together in axial direction to form the first conductor group.
- the transmission units according to different embodiments of the present invention are measured with a network analyzer (NA) under predetermined conditions, so as to find the influence of different combinations of the dielectric coefficients of the first and the second sheath 1111, 1121 on the signal transmission over the transmission units 1.
- NA network analyzer
- each type of the tested transmission units 1 according to the seventh embodiment has a different combination of the dielectric coefficients of the first sheaths 1111 and second sheaths 1121.
- Fig. 11 is a chart showing the result from an electromagnetic test conducted on a type "A" transmission unit 1 according to the seventh embodiment of the present invention, wherein the type "A" transmission unit 1 includes first and second sheaths 1111, 1121 both having a dielectric coefficient of 3.8.
- Fig. 12 is a chart showing the result from an electromagnetic test conducted on a type "B" transmission unit 1 according to the seventh embodiment of the present invention, wherein the type "B" transmission unit 1 includes first sheaths 1111 having a dielectric coefficient of 3.2 and second sheath 1121 having a dielectric coefficient of 3.8.
- Fig. 13 is a chart showing the result from an electromagnetic test conducted on a type "C" transmission unit 1 according to the seventh embodiment of the present invention, wherein the type "C" transmission unit 1 includes first sheaths 1111 having a dielectric coefficient of 3.8 and second sheath 1121 having a dielectric coefficient of 3.2.
- Fig. 14 is a chart showing the result from an electromagnetic test conducted on a type "D" transmission unit 1 according to the seventh embodiment of the present invention, wherein the type "D" transmission unit 1 includes first and second sheaths 1111, 1121 both having a dielectric coefficient of 3.2.
- the type "C" transmission unit according to the seventh embodiment of the present invention is proven in the electromagnetic test to show best data.
- the transmission unit can have effectively reduced crosstalk signal.
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Description
- The present invention relates to a transmission unit, and more particularly to a transmission unit that includes conductors surrounded by sheaths of different dielectric coefficients, so that a difference in dielectric property exists between the conductors to enable reduction of crosstalk occurred during high-speed signal transmission over the transmission unit.
- In recent years, the applications of audio and video signals have been constantly widened and improved. For example, video compact disk (VCD), digital versatile disk (DVD), high-definition digital television (HDTV), video call and video conference all have been introduced into people's daily life. Most of the currently available audio video (AV) systems process voice and image information in a completely digitalized manner to meet the newest technological trend. Different specifications and standards for AV systems have been constantly established, revised and updated, so that the AV systems can provide audio and visual signals with higher quality and can be applied to more different application fields to meet consumers' demands. Digital signals must be transmitted at further increased speed without the need of compression. Currently, there are many standardized digital video interfaces available for use, such as HDMI (high-definition multimedia interface), DVI (digital visual interface) and DisplayPort. Through digitized transmission of signals via these interfaces, images of enhanced quality can be displayed on electronic devices. The above-mentioned interfaces can be electrically connected to an adapter, a set-top box, a DVD player, a personal computer, a video game console, an integrated amplifier, a digital stereo system, etc. to enable long distance transmission of high quality signals at high speed, and are therefore widely welcome among consumers and can be seen everywhere now. The use of these standardized digital video interfaces to transmit video signals at high speed can provide better visual effect.
- Most cables for DisplayPort connector, DVI connector and HDMI connector are round cables or flat cables. Inside these cables, there is a plurality of metal conductors, which are respectively surrounded by an insulating layer to prevent short circuit between the metal signal conductors. Each signal pair is further surrounded by a metal shield to prevent crosstalk between the signal pair. While the metal shield can reduce the crosstalk between the signal pair, it makes the whole cable stiff, heavy and inconvenient for use. Further, to connect the cable to the terminals of the connector, it is necessary to strip a length of the metal shield from the signal pair. By doing this, scraps would be produced. Moreover, cables with conductors surrounded by metal shields could not be used with piercing terminals to enable automated assembling of cables.
-
DE 20 2007 017762 U1 describes a bus cable comprising a plurality of conductors and an isolating sheath covering the conductors, wherein the conductors are spaced equally parallel to one another, whereby the cable is flat and flexible and the isolating sheath comprises a material protecting against electromagnetic waves, whereby protection against electromagnetic waves is gained. - It is therefor a primary object of the present invention to provide a transmission unit that can reduce crosstalk occurred during high-speed signal transmission over the transmission unit.
- To achieve the above and other object, the transmission unit with reduced crosstalk signal according to the present invention includes a first conductor group, which includes at least one first conductor surrounded by a first sheath and at least one second conductor surrounded by a second sheath. The first and the second conductor are axially arranged corresponding to one another. The first sheath has a dielectric coefficient higher than that of the second sheath.
- In the present invention, there is a dielectric difference between the first sheath and the second sheath. When the first conductor is surrounded by the first sheath made of a high-dielectric material, the first conductor would have higher dielectric coefficient than the second conductor. In other words, when the first sheath has a high dielectric coefficient, the first conductor surrounded by the first sheath would correspondingly have a high dielectric coefficient. Since the high-dielectric coefficient material has good ability of concentrating electric field to enable easy storage of electric field energy, the transmission unit including the first conductor surrounded by the high-dielectric first sheath can reduce the crosstalk occurred during high-speed signal transmission over the transmission unit.
- The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein
-
Fig. 1 is a cross sectional view of a transmission unit with reduced crosstalk signal according to a first embodiment of the present invention; -
Fig. 2 is a cross sectional view of a transmission unit with reduced crosstalk signal according to a second embodiment of the present invention; -
Fig. 3 is a cross sectional view of a transmission unit with reduced crosstalk signal according to a third embodiment of the present invention; -
Fig. 4 is a cross sectional view of a transmission unit with reduced crosstalk signal according to a fourth embodiment of the present invention; -
Fig. 5 is a cross sectional view of a transmission unit with reduced crosstalk signal according to a fifth embodiment of the present invention; -
Fig. 6 is a cross sectional view of a transmission unit with reduced crosstalk signal according to a sixth embodiment of the present invention; -
Fig. 7 is a cross sectional view of a transmission unit with reduced crosstalk signal according to a seventh embodiment of the present invention; -
Fig. 8 is a cross sectional view of a transmission unit with reduced crosstalk signal according to an eighth embodiment of the present invention; -
Fig. 9 is a cross sectional view of a transmission unit with reduced crosstalk signal according to a ninth embodiment of the present invention; -
Fig. 10 is a perspective view of a transmission unit with reduced crosstalk signal according to a tenth embodiment of the present invention; -
Fig. 11 is a chart showing the result from an electromagnetic test conducted on a type "A" transmission unit according to the seventh embodiment of the present invention; -
Fig. 12 is a chart showing the result from an electromagnetic test conducted on a type "B" transmission unit according to the seventh embodiment of the present invention; -
Fig. 13 is a chart showing the result from an electromagnetic test conducted on a type "C" transmission unit according to the seventh embodiment of the present invention; and -
Fig. 14 is a chart showing the result from an electromagnetic test conducted on a type "D" transmission unit according to the seventh embodiment of the present invention. - The present invention will now be described with some preferred embodiments thereof and with reference to the accompanying drawings. For the purpose of easy to understand, elements that are the same in the preferred embodiments are denoted by the same reference numerals.
- Please refer to
Fig. 1 that is a cross sectional view of a transmission unit with reduced crosstalk signal according to a first embodiment of the present invention. For the purpose of conciseness, the present invention is also briefly referred as a transmission unit and generally denoted byreference numeral 1 herein. As shown, in the first embodiment, thetransmission unit 1 of the present invention includes afirst conductor group 11. - The
first conductor group 11 includes at least onefirst conductor 111 surrounded by afirst sheath 1111 and at least onesecond conductor 112 surrounded by asecond sheath 1121. The first and thesecond conductor first sheath 1111 has a dielectric coefficient higher than that of thesecond sheath 1121. - The
first conductor 111 is a signal conductor, and thesecond conductor 112 is an earth conductor. - Please refer to
Fig. 2 that is a cross sectional view of atransmission unit 1 according to a second embodiment of the present invention. As shown, in the second embodiment, thetransmission unit 1 includes afirst conductor group 11, asecond conductor group 12 and athird conductor group 13. Since thefirst conductor group 11 is structurally similar to that in the first embodiment, it is not repeated described in details herein. Thesecond conductor group 12 includes at least onethird conductor 121 surrounded by afirst sheath 1111 and at least onefourth conductor 122 surrounded by asecond sheath 1121. Thethird conductor group 13 includes at least onefifth conductor 131 surrounded by afirst sheath 1111 and at least onesixth conductor 132 surrounded by asecond sheath 1121. - In the second embodiment, there is a difference between the dielectric values of the
first sheath 1111 and thesecond sheath 1121. Since a high-dielectric material has good ability to concentrate electric field, the use of a low-dielectric material for one conductor in each of the signal pairs can reduce electric field concentration and accordingly, reduce crosstalk noise interference between the signal pairs. -
Fig. 3 is a cross sectional view of atransmission unit 1 according to a third embodiment of the present invention. As shown, in the third embodiment, thetransmission unit 1 includes afirst conductor group 11 having at least onefirst conductor 111 surrounded by afirst sheath 1111 and at least onesecond conductor 112; asecond conductor group 12 having at least onethird conductor 121 surrounded by afirst sheath 1111 and at least onefourth conductor 122; athird conductor group 13 having at least onefifth conductor 131 surrounded by afirst sheath 1111 and at least onesixth conductor 132; and asecond sheath 1121 surrounding all thefirst sheaths 1111 and the second, fourth andsixth conductors - Please refer to
Fig. 4 that is a cross sectional view of atransmission unit 1 according to a fourth embodiment of the present invention. As shown, in the fourth embodiment, thetransmission unit 1 includes afirst conductor group 1 having at least onefirst conductor 111 surrounded by afirst sheath 1111 and at least onesecond conductor 112 surrounded by asecond sheath 1121; asecond conductor group 12 having at least onethird conductor 121 surrounded by afirst sheath 1111 and at least onefourth conductor 122 surrounded by asecond sheath 1121; afirst earth conductor 14; asecond earth conductor 15; athird earth conductor 16; and a third sheath 1131. The first andsecond conductor groups second earth conductor 15 is arranged between the first and thesecond conductor group first earth conductor 14 is arranged to one side of thefirst conductor group 11 opposite to thesecond earth conductor 15; and thethird earth conductor 16 is arranged to one side of thesecond conductor group 12 opposite to thesecond earth conductor 15. Thethird sheath 1113 surrounds all the first andsecond sheaths third earth conductors second sheath third sheath 1113. - In the fourth embodiment, the
transmission unit 1 includes differential signal pairs and earth conductors. There is a difference between the dielectric values of the first andsecond sheaths third sheath 1113. Since a high-dielectric material has good ability to concentrate electric field, the use of a low-dielectric material for one conductor in each of the signal pairs can reduce electric field concentration and accordingly, reduce crosstalk noise interference between the signal pairs. -
Fig. 5 is a cross sectional view of atransmission unit 1 according to a fifth embodiment of the present invention. As shown, in the fifth embodiment, thetransmission unit 1 includes afirst conductor group 11 having at least onefirst conductor 111 surrounded by afirst sheath 1111 and at least onesecond conductor 112 surrounded by asecond sheath 1121; asecond conductor group 12 having at least onethird conductor 121 surrounded by afirst sheath 1111 and at least onefourth conductor 122 surrounded by asecond sheath 1121; athird conductor group 13 having at least onefifth conductor 131 surrounded by afirst sheath 1111 and at least onesixth conductor 132 surrounded by asecond sheath 1121; and athird sheath 1113 surrounding all thefirst sheaths 1111 andsecond sheaths 1121. All thefirst sheaths 1111 have a dielectric coefficient higher than that of thesecond sheaths 1121. - There are differences between the dielectric values of the first, the second and the
third sheath -
Fig. 6 is a cross sectional view of atransmission unit 1 according to a sixth embodiment of the present invention. As shown, in the sixth embodiment, thetransmission unit 1 includes afirst conductor group 11 having at least onefirst conductor 111 surrounded by afirst sheath 1111 and at least onesecond conductor 112; and asecond sheath 1121 surrounding thefirst sheath 1111 and thesecond conductor 112. The first and thesecond conductor -
Fig. 7 is a cross sectional view of atransmission unit 1 according to a seventh embodiment of the present invention. As shown, in the seventh embodiment, thetransmission unit 1 includes afirst conductor group 11, asecond conductor group 12, afirst earth conductor 14, asecond earth conductor 15, and athird earth conductor 16. Thefirst conductor group 11 includes at least onefirst conductor 111 and at least onesecond conductor 112, which are respectively surrounded by afirst sheath 1111; thesecond conductor group 12 includes at least onethird conductor 121 and at least onefourth conductor 122, which are respectively surrounded by afirst sheath 1111. The first and thesecond conductor group second earth conductor 15 is arranged between the first and thesecond conductor group first earth conductor 14 is arranged to one side of thefirst conductor group 11 opposite to thesecond earth conductor 15; and thethird earth conductor 16 is arranged to one side of thesecond conductor groups 12 opposite to thesecond earth conductor 15. The first, second andthird earth conductors second sheath 1121. Thefirst sheaths 1111 have a dielectric coefficient higher than that of thesecond sheaths 1121. - In the seventh embodiment, the
transmission unit 1 includes differential signal pairs and earth conductors. There is a difference between the dielectric values of thefirst sheaths 1111 and thesecond sheaths 1121. Since a high-dielectric material has good ability to concentrate electric field, the use of a low-dielectric material for one conductor in each of the signal pairs can reduce electric field concentration and accordingly, reduce crosstalk noise interference between the signal pairs. -
Fig. 8 is a cross sectional view of atransmission unit 1 according to an eighth embodiment of the present invention. As shown, thetransmission unit 1 in the eighth embodiment is generally structurally similar to the seventh embodiment, except for athird sheath 1113 that surrounds all the first andsecond sheaths - In the eighth embodiment, the
transmission unit 1 includes differential signal pairs and earth conductors. There are differences between the dielectric values of thefirst sheaths 1111, thesecond sheaths 1121, and thethird sheaths 1113. Since a high-dielectric material has good ability to concentrate electric field, the use of a low-dielectric material for one conductor in each of the signal pairs can reduce electric field concentration and accordingly, reduce crosstalk noise interference between the signal pairs. - Please now refer to
Fig. 9 is a cross sectional view of atransmission unit 1 according to a ninth embodiment of the present invention. As shown, thetransmission unit 1 in the ninth embodiment is generally structurally similar to the eighth embodiment, except that the first and thesecond conductor group fourth sheath 1114 before being further surrounded by thethird sheath 1113 along with the first, second andthird earth conductors fourth sheath 1114 is aluminum foil in the ninth embodiment. -
Fig. 10 is a perspective view of atransmission unit 1 according to a tenth embodiment of the present invention. As shown, thetransmission unit 1 in the tenth embodiment is generally structurally similar to the first embodiment, except that the at least onefirst conductor 111 and the at least onesecond conductor 112 are twisted together in axial direction to form the first conductor group. - The transmission units according to different embodiments of the present invention are measured with a network analyzer (NA) under predetermined conditions, so as to find the influence of different combinations of the dielectric coefficients of the first and the
second sheath transmission units 1. - For example, several types of the
transmission units 1 according to the seventh embodiment of the present invention are provided for measuring. Each type of the testedtransmission units 1 according to the seventh embodiment has a different combination of the dielectric coefficients of thefirst sheaths 1111 andsecond sheaths 1121. - Please refer to
Fig. 11 that is a chart showing the result from an electromagnetic test conducted on a type "A"transmission unit 1 according to the seventh embodiment of the present invention, wherein the type "A"transmission unit 1 includes first andsecond sheaths -
Fig. 12 is a chart showing the result from an electromagnetic test conducted on a type "B"transmission unit 1 according to the seventh embodiment of the present invention, wherein the type "B"transmission unit 1 includesfirst sheaths 1111 having a dielectric coefficient of 3.2 andsecond sheath 1121 having a dielectric coefficient of 3.8. -
Fig. 13 is a chart showing the result from an electromagnetic test conducted on a type "C"transmission unit 1 according to the seventh embodiment of the present invention, wherein the type "C"transmission unit 1 includesfirst sheaths 1111 having a dielectric coefficient of 3.8 andsecond sheath 1121 having a dielectric coefficient of 3.2. -
Fig. 14 is a chart showing the result from an electromagnetic test conducted on a type "D"transmission unit 1 according to the seventh embodiment of the present invention, wherein the type "D"transmission unit 1 includes first andsecond sheaths - The measured data are listed in Table 1 below.
Table 1 Influence of Different Combinations of Dielectric Coefficients On Signal Transmission Type Worst Near-end Crosstalk (NEXT) Value (< -26dB) Frequency at Worst Crosstalk Value (MHz) Result A -13.81 2099 Fail B -16.43 1190 Fail C -29.95 2805 Pass D -20.32 4455 Fail - As can be seen from Table 1, the type "C" transmission unit according to the seventh embodiment of the present invention is proven in the electromagnetic test to show best data. In conclusion, when the signal transmission conductors in the transmission unit have sheaths with a dielectric coefficient higher than that of the sheaths for other conductors, the transmission unit can have effectively reduced crosstalk signal.
- The present invention has been described with some preferred embodiments thereof and it is understood that many changes and modifications in the described embodiments can be carried out without departing from the scope of the invention that is intended to be limited only by the appended claims.
Claims (10)
- A transmission unit (1) with reduced crosstalk signal, comprising:a first conductor group (11) including at least one first conductor (111) surrounded by a first sheath (1111) andat least one second conductor (112) surrounded by a second sheath (1121);the first and second conductors (111, 112) being axially arranged corresponding to one another; characterized in that the first sheath (1111) having a dielectric coefficient higher than that of the second sheath (1121) and the first sheath (1111) surrounds a signal conductor and the second sheath (1121) surrounds an earth conductor.
- The transmission unit (1) as claimed in claim 1, further comprising a second conductor group (12) and a third conductor group (13); the second conductor group (12) including at least one third conductor (121) surrounded by a first sheath (1111) and at least one fourth conductor (122) surrounded by a second sheath (1121), and the third conductor group (13) including at least one fifth conductor (131) surrounded by a first sheath (1111) and at least one sixth conductor (132) surrounded by a second sheath (1121).
- The transmission unit (1) as claimed in claim 1, further comprising a second conductor group (12) and a third conductor group (13); the second conductor group (12) including at least one third conductor (121) surrounded by a first sheath (1111) and at least one fourth conductor (122), and the third conductor group (13) including at least one fifth conductor (131) surrounded by a first sheath (1111) and at least one sixth conductor (132); and the second sheath (1121) surrounding the second conductor (112) also surrounding all the first sheaths (1111), the fourth conductor (122) and the sixth conductor (132).
- The transmission unit (1) as claimed in claim 1, further comprising a second conductor group (12), a first earth conductor (14), a second earth conductor (15), a third earth conductor (16), and a third sheath (1113); the second conductor group (12) including at least one third conductor (121) surrounded by a first sheath (1111) and at least one fourth conductor (122) surrounded by a second sheath (1112); the first and second conductor groups (11, 12) being differential signal pairs; the second earth conductor (15) being arranged between the first and the second conductor groups (11, 12), the first earth conductor (14) being arranged to one side of the first conductor group (11) opposite to the second earth conductor (15), and the third earth conductor (16) being arranged to one side of the second conductor group (12) opposite to the second earth conductor (15); the third sheath (1113) surrounding the first and the second sheaths (1111, 1121) as well as the first, second and third earth conductors (14, 15, 16); and the first sheaths (1111) having a dielectric coefficient higher than that of the second sheaths (1121).
- The transmission unit (1) as claimed in claim 1, further comprising a second conductor group (12) and a third conductor group (13); the second conductor group (12) including at least one third conductor (121) and at least one fourth conductor (122) respectively surrounded by a first sheath (1111), and the third conductor group (13) including at least one fifth conductor (131) and at least one sixth conductor (132) respectively surrounded by a first sheath (1111); the second and the third conductor group (13) being single-ended signal pairs; the second sheath (1121) surrounding the second conductor (112) also surrounding all the first sheaths (1111); and the first sheaths (1111) having a dielectric coefficient higher than that of the second sheath (1121).
- The transmission unit (1) as claimed in claim 1, further comprising a second conductor group (12), a first earth conductor (14), a second earth conductor (15), and a third earth conductor (16); the first and second conductors (111, 112) included in the first conductor group (11) being respectively surrounded by a first sheath (1111); the second conductor group (12) including at least one third conductor (121) and at least one fourth conductor (122) respectively surrounded by a first sheath (1111); the first and second conductor groups (11, 12) being differential signal pairs; the second earth conductor (15) being arranged between the first and the second conductor groups (11, 12), the first earth conductor (14) being arranged to one side of the first conductor group (11) opposite to the second earth conductor (14), and the third earth conductor (16) being arranged to one side of the second conductor group (12) opposite to the second earth conductor (15); the first, second and third earth conductors (14, 15, 16) being respectively surrounded by a second sheath (1121); and the first sheaths (1111) having a dielectric coefficient higher than that of the second sheaths (1121).
- The transmission unit (1) as claimed in claim 1, wherein the first and the second conductor (111, 112) are parallelly arranged side by side.
- The transmission unit (1) as claimed in claim 1, wherein the first and the second conductor (111, 112) are axially twisted together.
- The transmission unit (1) as claimed in claim 6, further comprising a third sheath (1113).
- The transmission unit (1) as claimed in claim 9, further comprising a fourth sheath (1114) surrounding each of the first and the second conductor group (11, 12) to locate outside the first sheaths (1111); and the fourth sheath (1114) being aluminum foil.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20110174312 EP2549490B1 (en) | 2011-07-18 | 2011-07-18 | Transmission unit with reduced crosstalk signal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20110174312 EP2549490B1 (en) | 2011-07-18 | 2011-07-18 | Transmission unit with reduced crosstalk signal |
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EP2549490A1 EP2549490A1 (en) | 2013-01-23 |
EP2549490B1 true EP2549490B1 (en) | 2015-04-29 |
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EP20110174312 Active EP2549490B1 (en) | 2011-07-18 | 2011-07-18 | Transmission unit with reduced crosstalk signal |
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CN105529066A (en) * | 2016-02-18 | 2016-04-27 | 常熟泓淋电线电缆有限公司 | High-elasticity dual-branch special-shaped sound connecting line |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202007017762U1 (en) * | 2007-12-20 | 2008-04-10 | Yes Way Enterprise Corporation | Electromagnetic wave protecting bus cable |
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US4527135A (en) * | 1983-06-20 | 1985-07-02 | Woven Electronics Corp. | Woven controlled balanced transmission line |
DE3515724A1 (en) * | 1985-05-02 | 1986-11-06 | AEG KABEL AG, 4050 Mönchengladbach | Electrical flat stripline for telecommunications transmission |
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DE202007017762U1 (en) * | 2007-12-20 | 2008-04-10 | Yes Way Enterprise Corporation | Electromagnetic wave protecting bus cable |
Non-Patent Citations (1)
Title |
---|
"@BULLET Electric Potential Energy and Potential Difference @BULLETRelation between Electric Potential and Electric Field @BULLETEquipotential Lines @BULLETThe Electron Volt, a Unit of Energy @BULLETElectric Potential Due to Point Charges Units of Chapter 17 @BULLET Capacitance @BULLET Dielectrics @B", 1 January 2005 (2005-01-01), XP055116490, Retrieved from the Internet <URL:http://cherenkov.physics.iastate.edu/~mkpohl/teach/112/ch17.pdf> [retrieved on 20140506] * |
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