Cable impedance adjusting structure and coaxial cable

Abstract

The utility model provides a cable impedance adjusting structure and a coaxial cable. The cable impedance adjusting structure comprises a first annular conductor, a second annular conductor and a conductor sliding member. The first annular conductor is separated from the second annular conductor, the first annular conductor is located on the side, facing the butt joint direction, of the second annular conductor, and the axis of the first annular conductor coincides with the axis of the second annular conductor; the first annular conductor comprises a conductive part, the conductive part is bent in the rotating direction, the two opposite ends of the conductor sliding piece are attached to the outer side wall of the conductive part and the outer side wall of the second annular conductor respectively and are in sliding connection with the conductive part and the second annular conductor in the rotating direction, and the rotating direction is perpendicular to the butt joint direction; the rotation direction comprises the direction of the first rotor, and the width of the conductive part in the butt joint direction is gradually increased in the direction of the first rotor. According to the utility model, the characteristic impedance of the coaxial cable can be flexibly adjusted.

Description

Technical Field

[0001] The utility model relates to the technical field of coaxial cables, in particular to a cable impedance adjustment structure and a coaxial cable. Background Art

[0002] With the development of science and technology, the heat output of electronic products such as servers is increasing, and air cooling is gradually unable to meet the heat dissipation needs. However, since liquid cooling is more effective than air cooling, it has begun to be used in high-power density applications such as data centers.

[0003] Specifically, in data center immersion liquid cooling, coaxial cables, such as server high-speed transmission cables, are typically immersed in coolant to rapidly cool them. However, because the dielectric constant of coolant is higher than that of air, the characteristic impedance of the high-speed transmission cables immersed in the coolant changes, affecting their performance and causing server system instability.

[0004] Therefore, how to flexibly adjust the characteristic impedance of the coaxial cable has become an urgent problem that needs to be solved. Utility Model Content

[0005] To solve the above problems, the present invention provides a cable impedance adjustment structure and a coaxial cable, which can flexibly adjust the characteristic impedance of the coaxial cable by providing a first annular conductor, a second annular conductor and a conductor sliding member.

[0006] In a first aspect, the present invention provides a cable impedance adjustment structure, the cable impedance adjustment structure comprising: a first annular conductor, a second annular conductor, and a conductor sliding member;

[0007] The first annular conductor and the second annular conductor are separated from each other, the first annular conductor is located on a side of the second annular conductor facing the mating direction, and the axis of the first annular conductor coincides with the axis of the second annular conductor;

[0008] The first annular conductor includes a conductive portion, the conductive portion is bent along the rotation direction, and opposite ends of the conductor sliding member are respectively in contact with the conductive portion and the second annular conductor, and are respectively slidably connected to the conductive portion and the second annular conductor along the rotation direction, and the rotation direction is perpendicular to the docking direction;

[0009] The rotation direction includes the first rotor direction, and the width of the conductive portion in the docking direction gradually increases along the first rotor direction;

[0010] The farthest end of the conductor sliding member and the farthest end of the conductive part in the mating direction are both located in a plane perpendicular to the mating direction, or the farthest end of the conductor sliding member in the mating direction extends to one side of the conductive part in the mating direction.

[0011] Optionally, the conductive portion is a circular ring in the direction of the first rotor.

[0012] Optionally, the first annular conductor further includes an insulating portion, the rotation direction further includes a second rotor direction, and the first rotor direction is opposite to the second rotor direction;

[0013] The insulating portion is bent along the direction of the second rotor, and the insulating portion is fixedly connected to the conductive portion along the docking direction.

[0014] Optionally, the width of the insulating portion in the mating direction gradually increases along the direction of the second rotor.

[0015] Optionally, the cable adjustment structure further comprises: a driving member;

[0016] The driving component is located outside the conductor sliding component and is fixedly connected to the conductor sliding component.

[0017] Optionally, the driving member is made of insulating material.

[0018] Optionally, the driving member is annular in shape, and the driving member is coaxial with the first annular conductor.

[0019] In a second aspect, the present invention provides a coaxial cable, comprising the cable impedance adjustment structure according to any one of the first aspects.

[0020] Optionally, the coaxial cable further comprises: an inner transmission line, a first outer portion, and a second outer portion;

[0021] The first outer layer portion includes a first shielding layer, and the second outer layer portion includes a second shielding layer;

[0022] The first shielding layer is located on a side of the second shielding layer facing the docking direction, and the first shielding layer and the second shielding layer are both wrapped around the circumference of the internal transmission line and are separated from each other;

[0023] The axis of the first shielding layer coincides with the axis of the second shielding layer, the conductive portion is attached to the outer wall of the first shielding layer, and the second annular conductor is attached to the outer wall of the second shielding layer.

[0024] Optionally, a first limiting component is provided on the outer wall of the first outer layer portion, and a second limiting component is provided on the outer wall of the second outer layer portion;

[0025] The first limiting component and the second limiting component are used to limit the position of the cable impedance adjustment structure relative to the internal transmission line in the docking direction.

[0026] The cable impedance adjustment structure and coaxial cable provided by the embodiments of the present invention have a conductive portion on the first annular conductor whose width in the mating direction gradually increases along the direction of the first rotor, so that when the conductor slider rotates relative to the conductive portion, the contact area between the conductor slider and the conductive portion changes, thereby flexibly adjusting the resistance value of the cable impedance adjustment structure. That is, the larger the contact area between the conductor slider and the conductive portion, the smaller the resistance value of the cable impedance adjustment structure, thereby achieving flexible adjustment of the characteristic impedance of the coaxial cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 This is a schematic structural diagram of a coaxial cable according to an embodiment of the present application;

[0029] Figure 2 This is a schematic structural diagram of a first ring conductor according to an embodiment of the present application;

[0030] Figure 3 This is a schematic structural diagram of a first annular conductor connected to a conductor sliding member in an expanded state according to an embodiment of the present application;

[0031] Figure 4 This is a schematic structural diagram of a coaxial cable according to an embodiment of the present application;

[0032] Figure 5 This is a schematic structural diagram of a coaxial cable according to an embodiment of the present application;

[0033] Figure 6 This is a schematic structural diagram of a coaxial cable according to an embodiment of the present application;

[0034] Figure 7 This is a schematic structural diagram of a first annular conductor in an expanded state according to an embodiment of the present application;

[0035] Figure 8 This is a schematic structural diagram of a first ring conductor according to an embodiment of the present application;

[0036] Figure 9 This is a schematic structural diagram of a first annular conductor in an expanded state according to an embodiment of the present application;

[0037] Figure 10 This is a schematic structural diagram of a first ring conductor according to an embodiment of the present application;

[0038] Figure 11 This is a schematic partial cross-sectional view of a coaxial cable on a first outer layer portion according to an embodiment of the present application;

[0039] Figure 12 This is a schematic partial structural diagram of a coaxial cable according to an embodiment of the present application;

[0040] Figure 13 This is a schematic partial structural diagram of a coaxial cable according to an embodiment of the present application;

[0041] Figure 14 A schematic diagram illustrating changes in resistance value in a cable impedance adjustment structure according to an embodiment of the present application;

[0042] Figure 15 This is a schematic structural diagram of an immersion liquid cooling system according to an embodiment of the present application.

[0043] in, Figure 1 、 Figure 4 and Figure 6 The dotted lines in the figure represent part of the internal structure of the coaxial cable.

[0044] Reference numerals:

[0045] 1. First annular conductor; 11. Conductive part; 12. Insulating part; 2. Second annular conductor; 3. Conductor sliding part; 4. Driving part; 51. Cable impedance adjustment structure; 52. Internal transmission line; 53. First outer layer; 531. First shielding layer; 532. First filling dielectric layer; 533. First insulating layer; 54. Second outer layer; 541. Second shielding layer; 542. Second insulating layer; 55. First limiting component; 56. Second limiting component; 57. Fixed mark; 58. Rotating mark; 61. Coaxial cable; 62. Cable connector; 63. Board; 64. Chassis. DETAILED DESCRIPTION

[0046] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0048] Spatially relative terms such as "under," "beneath," "beneath," "under," "above," "above," etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that in addition to the orientations shown in the figures, spatially relative terms also include different orientations of the device in use and operation. For example, if the device in the drawings is turned over, the element or feature described as "under" or "beneath" or "beneath" the other elements will be oriented as "above" the other elements or features. Thus, the exemplary terms "under" and "under" can include both upper and lower orientations. In addition, the device can also include alternative orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0049] It should be noted that when an element is referred to as being "fixedly connected" to another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element. Conversely, when an element is referred to as being "directly on" another element, there are no intermediate elements. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0050] When used herein, the singular forms "a", "an", and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

[0051] First, the proper nouns involved in this utility model are explained:

[0052] Cooling liquid: Cooling liquid, used to transfer heat;

[0053] Characteristic impedance: During signal transmission, the internal transmission line of the coaxial cable is equivalent to a resistor. This equivalent resistance is called the characteristic impedance of the transmission line.

[0054] PCBA: Printed Circuit Board Assembly, the name of a printed circuit board plus components, also called a board.

[0055] Example 1

[0056] This embodiment provides a cable impedance adjustment structure 51, see Figure 1The cable impedance adjustment structure 51 includes: a first annular conductor 1 , a second annular conductor 2 and a conductor sliding member 3 .

[0057] The first annular conductor 1 and the second annular conductor 2 are separated from each other. The first annular conductor 1 is located on the side of the second annular conductor 2 facing the mating direction. The axis of the first annular conductor 1 coincides with the axis of the second annular conductor 2 .

[0058] Combine Figure 2 and Figure 3 The first annular conductor 1 includes a conductive portion 11. The conductive portion 11 is bent along the rotation direction. The opposite ends of the conductor slider 3 are respectively in contact with the outer wall of the conductive portion 11 and the outer wall of the second annular conductor 2, and are respectively slidably connected to the conductive portion 11 and the second annular conductor 2 along the rotation direction. The rotation direction is perpendicular to the docking direction.

[0059] The rotation direction includes the first rotor direction, and the width of the conductive portion 11 in the docking direction gradually increases along the first rotor direction.

[0060] The farthest end of the conductor slider 3 in the mating direction and the farthest end of the conductive portion 11 in the mating direction are both located in a plane perpendicular to the mating direction, or the farthest end of the conductor slider 3 in the mating direction extends to the side of the conductive portion 11 in the mating direction. By defining the relative positions of the farthest ends of the conductor slider 3 and the farthest ends of the conductive portion 11, it is possible to ensure that the contact area between the conductor slider 3 and the conductive portion 11 changes with the width of the conductive portion 11 in the mating direction when the conductor slider 3 rotates relative to the conductive portion 11.

[0061] It can be understood that the shape of the farthest end of the conductor slider 3 toward the docking direction can be a straight line segment, an arc segment or a pointed angle. The conductor slider 3 can slide in a clockwise or counterclockwise direction on the surface of the first annular conductor 1 and the second annular conductor 2. The orthographic projection of the conductive part 11 in the docking direction is an arc or a circular ring. The width of the conductive part 11 in the docking direction gradually increases along the direction of the first rotor, which means that the width of the conductive part 11 in the docking direction gradually increases within an angular range of less than 360 degrees. When the orthographic projection of the conductive part 11 in the docking direction is a circular ring, the width of the conductive part 11 in the docking direction gradually increases along the direction of the first rotor, which means that the end of the conductive part 11 with the largest width in the docking direction is relatively connected to the other end with the smallest width.

[0062] The conductive portion 11 in the unfolded state may be shaped like at least one of a triangle and a right trapezoid. In addition, the conductive portion 11 may be shaped like a curve on the oblique line of the right triangle or a curve on the oblique line of the right trapezoid, but the present invention is not limited thereto.

[0063] In this embodiment, the first annular conductor 1 is located to the left of the second annular conductor 2, meaning the mating direction is horizontal and facing leftward. The counterclockwise rotation direction of the conductor slider 3, viewed from left to right, is the first rotor direction. The orthographic projection of the conductive portion 11 in the mating direction is circular. The conductive portion 11, when deployed, is a right triangle. The conductor slider 3 is rectangular. The leftmost end of the conductor slider 3 is flush with the leftmost end of the conductive portion 11 and forms a straight line perpendicular to the mating direction.

[0064] The cable impedance adjustment structure 51 provided in this embodiment is provided with a conductive portion 11 on the first annular conductor 1, the width of which gradually increases along the direction of the first rotor in the mating direction. When the conductor slider 3 rotates relative to the conductive portion 11, the contact area between the conductor slider 3 and the conductive portion 11 changes, thereby flexibly adjusting the resistance value of the cable impedance adjustment structure 51. That is, the larger the contact area between the conductor slider 3 and the conductive portion 11, the smaller the resistance value of the cable impedance adjustment structure 51. When the cable impedance adjustment structure 51 is installed on the coaxial cable 61, the characteristic impedance of the coaxial cable 61 can be flexibly adjusted.

[0065] Furthermore, the first annular conductor 1 further includes an insulating portion 12. The rotation direction further includes a second rotor direction. The first rotor direction is opposite to the second rotor direction.

[0066] The insulating portion 12 is bent along the second rotor direction, and is fixedly connected to the conductive portion 11 along the docking direction, and an outer wall of the insulating portion 12 is flush with an outer wall of the conductive portion 11 .

[0067] It is understood that the insulating portion 12 can be located on one side of the conductive portion 11 or on opposite sides of the conductive portion 11. In this embodiment, the insulating portion 12 has the same thickness as the conductive portion 11 and is coaxial with the conductive portion 11. The orthographic projection of the insulating portion 12 along the mating direction is annular and is located on the side of the conductive portion 11 facing the mating direction. The conductor slider 3 also fits in contact with the insulating portion 12. The provision of the insulating portion 12 enhances the structural stability of the conductive portion 11.

[0068] Furthermore, the width of the insulating portion 12 in the mating direction gradually increases along the second rotor direction. By limiting the width of the insulating portion 12, the overall width of the first annular conductor 1 in the mating direction can be stabilized, thereby improving the overall structural stability of the first annular conductor 1.

[0069] In this embodiment, the shape of the insulating portion 12 is identical to that of the conductive portion 11. Specifically, the width of the insulating portion 12 in the mating direction follows the same trend as the width of the conductive portion 11 in the mating direction along the first rotor. The first annular conductor 1, consisting of the conductive portion 11 and the insulating portion 12, has an overall rectangular shape when deployed. The distal ends of the conductor slider 3 and the insulating portion 12, both facing the mating direction, lie within a plane perpendicular to the mating direction.

[0070] By limiting the shape of the insulating portion 12 and the position of the insulating portion 12 relative to the conductor slider 3 , the stability of the cable impedance adjustment structure 51 can be enhanced while also improving the space utilization of the cable impedance adjustment structure 51 .

[0071] Combine Figure 4 、 Figure 5 and Figure 6 The cable impedance adjustment structure further includes a driver 4. The driver 4 is located outside the conductor slider 3 and is fixedly connected to the conductor slider 3. The driver 4 facilitates the rotation of the conductor slider 3 relative to the first annular conductor 1, thereby improving the ease of operation of the cable impedance adjustment structure 51.

[0072] In this embodiment, the driver 4 is made of an insulating material and is annular in shape, coaxial with the first annular conductor 1. The conductor slider 3 is located inside the driver 4 and fixedly connected to its inner sidewall. The driver 4 is sleeved onto the outside of the first and second annular conductors 1, 2, and is rotationally connected thereto, respectively. By defining the shape and mounting position of the driver 4, the conductor slider 3 is protected while also ensuring rotational stability relative to the first annular conductor 1.

[0073] It is understandable that the conductor sliding member 3 and the conductive portion 11 are both made of conductive materials, and the insulating portion 12 is made of insulating material; the structure of the second annular conductor 2 may be the same as or different from that of the first annular conductor 1 .

[0074] In this embodiment, the second annular conductor 2 is made of a conductive material, that is, when the conductor slider 3 rotates relative to the second annular conductor 2 , the effective conductive contact area between the conductor slider 3 and the second annular conductor 2 remains unchanged.

[0075] In this embodiment, when the left end of the conductor slider 3 is in contact with the narrowest end of the conductive part 11, the resistance value of the cable impedance adjustment structure 51 is the largest; when the conductor slider 3 moves along the first rotor direction, the effective conductive contact area between the conductor slider 3 and the conductive part 11 gradually increases, and the resistance value of the cable impedance adjustment structure 51 gradually decreases; when the left end of the conductor slider 3 is in contact with the widest end of the conductive part 11, the resistance value of the cable impedance adjustment structure 51 is the largest.

[0076] The cable impedance adjustment structure 51 provided in this embodiment has a simple structure, low manufacturing cost, and is easy to operate. The resistance value of the cable impedance adjustment structure 51 can be adjusted simply by rotating the driver 4. When the cable impedance adjustment structure 51 is applied to a coaxial cable 61, the characteristic impedance of the coaxial cable 61 can be flexibly adjusted.

[0077] Example 2

[0078] This embodiment provides a cable impedance adjustment structure 51, which is different from the cable impedance adjustment structure 51 in embodiment 1 in that the conductive portion 11 and the insulating portion 12 in this embodiment have different shapes. Figure 7 and Figure 8 In this embodiment, the conductive portion 11 is shaped like a right trapezoid when deployed, while the insulating portion 12 is shaped like a right triangle. The orthographic projection of the insulating portion 12 in the mating direction is an arc. Furthermore, the length of the widest end of the conductive portion 11 in the direction of the first rotor is greater than or equal to the length of the conductor slider 3 in the direction of the first rotor. Thus, when the conductor slider 3 is fully aligned with the widest end of the conductive portion 11, the resistance of the cable impedance adjustment structure 51 is minimal and close to zero.

[0079] Example 3

[0080] This embodiment provides a cable impedance adjustment structure 51, which is different from the cable impedance adjustment structure 51 in embodiment 1 in that the shapes of the conductive portion 11 and the insulating portion 12 in this embodiment are different. Figure 9 and Figure 10In this embodiment, the conductive portion 11 and the insulating portion 12 are both rectangular trapezoids in their unfolded state; the orthographic projections of the insulating portion 12 and the conductive portion 11 in the mating direction are both arc-shaped, and the length of the widest end of the conductive portion 11 in the first rotor direction and the length of the widest end of the insulating portion 12 in the second rotor direction are both greater than or equal to the length of the conductor slider 3 in the first rotor direction. Thus, when the conductor slider 3 and the widest ends of the conductive portion 11 are fully aligned, the resistance of the cable impedance adjustment structure 51 is minimal and close to 0. When the conductor slider 3 and the widest ends of the insulating portion 12 are fully aligned, the resistance of the cable impedance adjustment structure 51 is maximized. In this embodiment, the maximum resistance of the cable impedance adjustment structure 51 is 100 ohms, but is not limited thereto.

[0081] Example 4

[0082] This embodiment provides a coaxial cable 61, see Figure 1 and Figure 6 The coaxial cable 61 includes the cable impedance adjustment structure 51 as described in any one of the first or second aspects, which is not specifically limited in this example.

[0083] The coaxial cable 61 further includes an inner transmission line 52, a first outer layer 53, and a second outer layer 54. The first outer layer 53 is located on the side of the second outer layer 54 facing the mating direction. The first outer layer 53 and the second outer layer 54 are both wrapped around the inner transmission line 52 and separated from each other.

[0084] The first outer portion 53 includes a first shielding layer 531, and the second outer portion 54 includes a second shielding layer 541. The first shielding layer 531 is located on the side of the second shielding layer 541 facing the mating direction. The first shielding layer 531 and the second shielding layer 541 are both wrapped around the inner transmission line 52 and separated from each other.

[0085] The axis of the first shielding layer 531 coincides with the axis of the second shielding layer 541 . The conductive portion 11 is attached to the outer wall of the first shielding layer 531 , and the second annular conductor 2 is attached to the outer wall of the second shielding layer 541 .

[0086] In this embodiment, the rightmost end of the first shielding layer 531 is flush with the rightmost end of the first ring conductor 1, and the leftmost end of the second shielding layer 541 is flush with the leftmost end of the second ring conductor 2, that is, the inner wall of the first ring conductor 1 is completely in contact with the first shielding layer 531, and the inner wall of the second ring conductor 2 is completely in contact with the second shielding layer 541.

[0087] Combine Figure 11 and Figure 12The first outer layer 53 further includes a first filling dielectric layer 532 and a first insulating layer 533. The first filling dielectric layer 532 is coated on the outer peripheral side of the internal transmission line 52. The first shielding layer 531 is coated on the outer peripheral side of the first filling dielectric layer 532. The first insulating layer 533 is coated on the outer peripheral side of the first filling dielectric layer 532. Figure 4 and Figure 5 The second outer layer 54 also includes a second filling dielectric layer and a second insulating layer 542. The second filling dielectric layer is coated on the outer peripheral side of the internal transmission line 52. The second shielding layer 541 is coated on the outer peripheral side of the second filling dielectric layer. The second insulating layer 542 is coated on the outer peripheral side of the second filling dielectric layer.

[0088] Among them, the internal transmission line 52 is the medium that actually transmits the signal, and its material is copper but not limited to this; the materials of the first shielding layer 531 and the second shielding layer 541 are both conductive metals, such as copper but not limited to this, which are used to prevent external interference sources from interfering with the signal transmission of the internal transmission line 52.

[0089] The first filling dielectric layer 532 and the second filling dielectric layer respectively separate the outer first shielding layer 531 and the second shielding layer 541 from the internal transmission line 52. The materials thereof may be, but are not limited to, thermoplastic resins such as fluororesin and polyolefin, silicone rubber, fluororubber, polyvinyl chloride (PVC), and polyurethane. The first filling dielectric layer 532 and the second filling dielectric layer are preferably made of thermoplastic resins such as fluororesin and polyolefin. In this embodiment, the first filling dielectric layer 532 and the second filling dielectric layer are made of polyolefin thermoplastic resin, which has excellent properties such as flexibility and extrudability. Compared to other insulating materials, it has a low dielectric constant, high volume resistivity, and high insulation properties.

[0090] The first insulating layer 533 and the second insulating layer 542 are the sheaths of the coaxial cable 61 , and the materials used therefor may be fluororesin, polyvinyl chloride, polyurethane, polyethylene, polyamide resin, polyimide resin, polyester elastomer, etc., but are not limited thereto.

[0091] In a further optional embodiment of this embodiment, in combination with Figure 4 A first limiting member 55 is provided on the outer wall of the first outer layer 53, and a second limiting member 56 is provided on the outer wall of the second outer layer 54. The first limiting member 55 and the second limiting member 56 are used to limit the position of the cable impedance adjustment structure 51 relative to the internal transmission line 52 in the docking direction.

[0092] Among them, the first limiting component 55 can be a protrusion fixed on the surface of the first outer layer part 53, or it can be an annular protrusion fixedly sleeved on the outer circumference of the first outer layer part 53, or it can be an annular groove recessed inwardly on the surface of the first outer layer part 53; the second limiting component 56 can be a protrusion fixed on the surface of the second outer layer part 54, or it can be an annular protrusion fixedly sleeved on the outer circumference of the second outer layer part 54, or it can be an annular groove recessed inwardly on the surface of the second outer layer part 54.

[0093] In this embodiment, the outer surface of the conductive part 11 is flush with the outer surface of the first insulating layer 533, and the structure of the first limiting component 55 is an annular protrusion and is fixed on the outer surface of the first insulating layer 533; the outer surface of the second annular conductor 2 is flush with the outer surface of the second insulating layer 542, and the structure of the second limiting component 56 is an annular protrusion and is fixed on the outer surface of the second insulating layer 542.

[0094] The first limiting member 55 is located on the side of the driver 4 facing the mating direction and abuts the left end of the driver 4. The second limiting member 56 is located on the side of the driver 4 facing away from the mating direction and abuts the right end of the driver 4. The provision of the first limiting member 55 and the second limiting member 56 prevents the driver 4 from causing the conductive slider 3 to move axially along the coaxial cable 61, thereby affecting the adjustment of the characteristic resistance of the coaxial cable 61.

[0095] It should be noted that the space between the first loop conductor 1 and the second loop conductor 2 may be filled with insulating material.

[0096] In this embodiment, the first filling dielectric layer 532 is directly connected to the second filling dielectric layer to cover the internal transmission line 52, and the space between the first shielding layer 531 and the second shielding layer 541 and the space between the first ring conductor 1 and the second ring conductor 2 are filled with the material of the first insulating layer 533, but the present invention is not limited thereto.

[0097] In this embodiment, the conductive slider 3 is rotated by rotating the driving member 4, thereby adjusting the resistance between the first shielding layer 531 and the second shielding layer 541, and thereby adjusting the characteristic impedance of the internal transmission line 52. Specifically, when the resistance of the cable impedance adjustment structure 51 increases, the characteristic impedance of the internal transmission line 52 increases; when the resistance of the cable impedance adjustment structure 51 decreases, the characteristic impedance of the internal transmission line 52 decreases.

[0098] The characteristic impedance Z0 of the internal transmission line 52 is expressed as follows, which is related to the inductance L and the capacitance C, as shown in Formula 1:

[0099]

[0100] The size of the capacitor C will affect the size of the current return. The larger the capacitor C, the larger the return current, as shown in the following formula 2:

[0101] I=C·dV / dt Formula 2

[0102] Where dV / dt is the rate of change of voltage with time (volts per second).

[0103] The magnitude of the current is related to the resistance in the path. The greater the resistance, the smaller the current, and vice versa, the smaller the resistance, the greater the current, as shown in the following formula 3:

[0104]

[0105] In this way, when the current signal passes through the internal transmission line 52, the current will flow back through the first shielding layer 531 and the second shielding layer 541, and the magnitude of the return current will affect the characteristic impedance of the internal transmission line 52. The present invention adjusts the impedance of the internal transmission line 52 by adjusting the magnitude of the return resistance, that is, the resistance magnitude of the cable impedance adjustment structure 51.

[0106] The greater the resistance of the cable impedance adjustment structure 51, the smaller the current flowing through the first shielding layer 531 and the second shielding layer 541, and the smaller the capacitance value C of the capacitor formed by the first shielding layer 531, the second shielding layer 541 and the internal transmission line 52, and the impedance Z0 of the internal transmission line 52 will increase.

[0107] The smaller the resistance of the cable impedance adjustment structure 51, the greater the current flowing through the first shielding layer 531 and the second shielding layer 541, and the larger the capacitance C of the capacitor formed by the first shielding layer 531, the second shielding layer 541 and the internal transmission line 52, and the impedance Z0 of the internal transmission line 52 will decrease.

[0108] In a further optional embodiment of this embodiment, in combination with Figure 13 The surface of the first outer portion 53 or the second outer portion 54 is provided with a fixed mark 57, and the outer surface of the driving member 4 is provided with a rotation mark 58. When the fixed mark 57 and the rotation mark 58 are aligned, it indicates that the conductor slider 3 is in contact with the widest end of the conductive portion 11.

[0109] Combine Figure 9 、 Figure 10 and Figure 13 Taking the cable impedance adjustment structure 51 in Example 3, where the widest end of the conductive portion 11 is located below the narrowest end, as an example, when the fixed mark 57 and the rotating mark 58 are aligned, the upper side of the conductor slider 3 coincides with the upper side of the widest end of the conductive portion 11. At this time, the resistance value of the cable impedance adjustment structure 51 is the smallest. When the driving member 4 is rotated clockwise, the resistance of the cable impedance adjustment structure 51 increases linearly. Figure 14, until the upper side of the conductor slider 3 is separated from the conductive portion 11 and the left end of the conductor slider 3 completely overlaps with the widest end of the insulating portion 12. At this point, the resistance of the cable impedance adjustment structure 51 is maximum, at 100 ohms. The rotation angle range x1 over which the resistance of the cable impedance adjustment structure 51 changes linearly is less than 360 degrees. The specific value is determined by the effective width of the widest end of the conductive portion 11 and the effective width of the widest end of the insulating portion 12, and is not specifically limited in this embodiment. When x1 is 0, it indicates that the left end of the conductor slider 3 completely overlaps with the widest end of the conductive portion 11 and overlaps with the upper side of the conductor slider 3 and the lower side of the narrowest end of the insulating portion 12. A resistance value of 0 is ideal.

[0110] The coaxial cable 61 provided in this embodiment can flexibly adjust its characteristic impedance, improving its usability and scalability, allowing it to be used in scenarios with varying characteristic impedances. This coaxial cable 61 is particularly suitable for use in servers, such as high-speed transmission cables used to connect different PCBAs and immersed in coolant. There is no concern about the coolant's effect on the characteristic impedance of the coaxial cable 61. Furthermore, the coaxial cable 61 has a simple structure, is easy to implement, has low manufacturing costs, and offers reliable performance.

[0111] Example 5

[0112] This embodiment provides an immersion liquid cooling system. Figure 15 The immersion liquid cooling system includes a chassis 64 filled with coolant and a coaxial cable 61 as described in Example 4 located within the chassis 64. Cable connectors 62 are connected to corresponding boards 63 at both ends of the coaxial cable 61. Both the cable connectors 62 and the corresponding boards 63 are located within the chassis 64.

[0113] Throughout this specification, references to terms such as "some embodiments," "other embodiments," and "desired embodiments" indicate that a particular feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present application. The schematic descriptions of these terms throughout this specification do not necessarily refer to the same embodiment or example.

[0114] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0115] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A cable impedance adjustment structure, characterized in that: The cable impedance adjustment structure includes: a first annular conductor, a second annular conductor and a conductor sliding member; The first annular conductor and the second annular conductor are separated from each other, the first annular conductor is located on a side of the second annular conductor facing the mating direction, and the axis of the first annular conductor coincides with the axis of the second annular conductor; The first annular conductor includes a conductive portion, the conductive portion is bent along the rotation direction, and opposite ends of the conductor sliding member are respectively in contact with the conductive portion and the second annular conductor, and are respectively slidably connected to the conductive portion and the second annular conductor along the rotation direction, and the rotation direction is perpendicular to the docking direction; The rotation direction includes a first rotor direction, and the width of the conductive portion in the docking direction gradually increases along the first rotor direction; The farthest end of the conductor sliding member toward the mating direction and the farthest end of the conductive portion toward the mating direction are both located in a plane perpendicular to the mating direction, or the farthest end of the conductor sliding member toward the mating direction extends to one side of the conductive portion toward the mating direction.

2. The cable impedance adjustment structure according to claim 1, wherein: The conductive portion is a circular ring in the direction of the first rotor.

3. The cable impedance adjustment structure according to claim 1, wherein: The first annular conductor further includes an insulating portion, the rotation direction further includes a second rotor direction, and the first rotor direction is opposite to the second rotor direction; The insulating portion is bent along the direction of the second rotor, and the insulating portion is fixedly connected to the conductive portion along the docking direction.

4. The cable impedance adjustment structure according to claim 3, wherein: The width of the insulating portion in the mating direction gradually increases along the direction of the second rotor.

5. The cable impedance adjustment structure according to any one of claims 1 to 4, characterized in that: The cable adjustment structure further includes: a driving member; The driving member is located outside the conductor sliding member and is fixedly connected to the conductor sliding member.

6. The cable impedance adjustment structure according to claim 5, characterized in that: The driving member is made of insulating material.

7. The cable impedance adjustment structure according to claim 5, characterized in that: The driving member is in a ring shape and is coaxial with the first ring conductor.

8. A coaxial cable, characterized in that: The coaxial cable includes the cable impedance adjustment structure according to any one of claims 1 to 7.

9. The coaxial cable according to claim 8, wherein: The coaxial cable further comprises: an inner transmission line, a first outer portion, and a second outer portion; The first outer layer portion includes a first shielding layer, and the second outer layer portion includes a second shielding layer; The first shielding layer is located on a side of the second shielding layer facing the docking direction, and the first shielding layer and the second shielding layer are both wrapped around the circumference of the internal transmission line and are separated from each other; The axis of the first shielding layer coincides with the axis of the second shielding layer, the conductive portion is attached to the outer wall of the first shielding layer, and the second annular conductor is attached to the outer wall of the second shielding layer.

10. The coaxial cable according to claim 9, wherein: A first limiting component is provided on the outer wall of the first outer layer part, and a second limiting component is provided on the outer wall of the second outer layer part; the first limiting component and the second limiting component are used to limit the position of the cable impedance adjustment structure relative to the internal transmission line in the docking direction.

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