Shielded electrical terminal with knurling on inner contact wall

Abstract

A shielded electrical terminal (100) is presented. The shielded electrical terminal (100) includes a fixed portion (102) configured to be attached to an outer shield conductor of a shielded cable and a cylindrical mating portion (104) having an inner surface (106) configured to make electrical contact with a corresponding cylindrical shield terminal inserted within the mating portion (104). The inner surface (106) of the mating portion defines a plurality of protrusions (110) extending from the inner surface (106).

Description

Technical Field

[0001] This application claims priority to U.S. Patent Application No. 17 / 243,844, filed April 29, 2021, which is incorporated herein by reference.

[0002] This application relates to a shielded electrical terminal suitable for electrical interconnection with a shielded cable, and more particularly to a shielded electrical terminal with knurling on the inner contact wall. Background Technology

[0003] Electrical contact between terminals, such as shielded electrical terminals used to terminate the shielded conductor of a shielded cable (e.g., coaxial cable), typically relies on generating contact forces between the terminals. Shielded electrical terminals usually use one or more spring-loaded contact arms to provide this contact force. However, this arrangement often provides several small electrical contact points between the male and female shielded terminals. Furthermore, mechanical vibrations between the corresponding components can cause abrasion at the contact points, ultimately leading to the loss or degradation of the electrical contact as the conductive material wears down at these small contact points, for example, increasing resistance. To prevent this problem, complex geometries associated with the electrical contact can be used to ensure additional contact points. However, this additional complexity increases the time and cost associated with manufacturing the electrical contact.

[0004] It is beneficial to develop an electrical contact that provides a cost-effective system for increasing the number of contact points between corresponding terminals while maintaining electrical contact in the presence of mechanical vibration / abrasion and minimizing the air gap between corresponding terminals. Summary of the Invention

[0005] According to one or more aspects of this disclosure, a shielded electrical terminal includes a fixing portion and a cylindrical mating portion. The fixing portion is configured to attach the shielded electrical terminal to the outer shielding conductor of a shielded cable. The cylindrical mating portion has an inner surface configured to make electrical contact with a corresponding cylindrical shielded terminal inserted into the mating portion. The inner surface defines a plurality of protrusions extending from the inner surface.

[0006] In one or more embodiments of the shielded electrical terminals according to the preceding paragraph, the heights of the multiple protrusions are not uniform.

[0007] In one or more embodiments of the shielded electrical terminal according to any of the preceding paragraphs, the inner surface defines a knurled surface having a plurality of recesses, wherein a plurality of protrusions are arranged on the periphery of the plurality of recesses.

[0008] In one or more embodiments of the shielded electrical terminals according to any of the preceding paragraphs, each of the plurality of recesses is diamond-shaped.

[0009] In one or more embodiments of the shielded electrical terminal as described in any of the preceding paragraphs, the long axes of the plurality of rhomboid recesses are aligned substantially parallel to the longitudinal axis of the shielded electrical terminal, while the short axes of the plurality of rhomboid recesses are aligned substantially perpendicular to the longitudinal axis of the shielded electrical terminal.

[0010] In one or more embodiments of the shielded electrical terminals according to any of the preceding paragraphs, the outer wall of the mating portion is continuous and does not define an opening extending therethrough.

[0011] In one or more embodiments of the shielded electrical terminal according to any of the preceding paragraphs, the outer wall of the mating portion defines an axial gap aligned parallel to the longitudinal axis of the shielded electrical terminal.

[0012] In one or more embodiments of the shielded electrical terminals according to any of the preceding paragraphs, the mating portion and the fixing portion are formed of metal sheets. The thickness of the metal sheet forming the mating portion is equal to the thickness of the metal sheet forming the fixing portion.

[0013] In one or more embodiments of the shielded electrical terminals according to any of the preceding paragraphs, the mating portion is formed of a first metal sheet, and the fixing portion is formed of a second metal sheet. The thickness of the first metal sheet is less than the thickness of the second metal sheet.

[0014] In one or more embodiments of the shielded electrical terminals according to any of the preceding paragraphs, the size, shape, and arrangement of the plurality of protrusions are configured to minimize the air gap formed between the inner surface of the mating portion and the inserted respective cylindrical shielded terminal when inserted into the mating portion.

[0015] According to one or more aspects of this disclosure, a method for forming a shielded electrical terminal is provided. The shielded electrical terminal formed by this method has a mating portion and a fixing portion, the mating portion being configured to make electrical contact with a corresponding cylindrical shielded terminal inserted into the mating portion, and the fixing portion being configured to attach the shielded electrical terminal to the outer shielding conductor of a shielded cable. The method includes the following steps:

[0016] a) A terminal preform is formed from a first metal sheet;

[0017] b) Forming a plurality of protrusions in the surface of the terminal preform, such that the plurality of protrusions extend from the surface; and

[0018] c) Roll the terminal preform into a cylindrical shape to form a mating portion having an inner surface configured to make electrical contact with a corresponding cylindrical male shielding terminal inserted into the mating portion, wherein the inner surface is the inner surface of the mating portion.

[0019] In one or more embodiments of the method according to the preceding paragraph, the plurality of protrusions are formed to be non-uniform in height.

[0020] In one or more embodiments of the method according to any of the preceding paragraphs, step b) forming a plurality of protrusions in the surface of the terminal preform such that the plurality of protrusions extend from the surface further includes the following step:

[0021] d) A plurality of recesses are formed in the surface such that a plurality of protrusions are arranged on the periphery of the plurality of recesses.

[0022] In one or more embodiments of the method according to any of the preceding paragraphs, the plurality of protrusions and the plurality of recesses are formed using a knurling process.

[0023] In one or more embodiments of the method according to any of the preceding paragraphs, each of the plurality of recesses is rhomboid. The plurality of recesses are formed such that the long axes of the plurality of rhomboid recesses are aligned substantially parallel to the longitudinal axis of the shielded electrical terminal, and the plurality of recesses are shaped such that the short axes of the plurality of rhomboid recesses are aligned substantially perpendicular to the longitudinal axis of the shielded electrical terminal.

[0024] In one or more embodiments of the method according to any of the preceding paragraphs, the outer wall of the mating portion is continuous and does not define an orifice extending therethrough.

[0025] In one or more embodiments of the method according to any of the preceding paragraphs, the outer wall of the mating portion defines an axial gap aligned parallel to the longitudinal axis of the shielded electrical terminal.

[0026] In one or more embodiments of the method according to any of the preceding paragraphs, the method further includes the following steps:

[0027] e) A fixed portion is formed from a first metal sheet, wherein the thickness of the mating portion is equal to the thickness of the fixed portion.

[0028] In one or more embodiments of the method according to any of the preceding paragraphs, the method further includes the following steps:

[0029] f) A fixing portion is formed from the second metal sheet, wherein the thickness of the first metal sheet forming the mating portion is less than the thickness of the second metal sheet forming the fixing portion.

[0030] In one or more embodiments of the method according to any of the preceding paragraphs, the method further includes the following steps:

[0031] g) Insert the corresponding cylindrical shielding terminal into the mating portion, wherein the size, shape and arrangement of the plurality of protrusions are determined to minimize the air gap formed between the inner surface of the mating portion and the corresponding cylindrical shielding terminal. Attached Figure Description

[0032] The invention will now be described by way of example with reference to the accompanying drawings, in which:

[0033] Figure 1 This is a perspective view of shielded electrical terminals and corresponding mating shielded electrical terminals according to some embodiments;

[0034] Figure 2 According to some embodiments Figure 1 A partial 3D view of the shielded electrical terminals;

[0035] Figure 3 According to some embodiments Figure 1 A partial cross-sectional view of the shielded electrical terminals;

[0036] Figure 4 According to some embodiments Figure 1 Enlarged view of the knurling on the inner surface of the shielded electrical terminal;

[0037] Figure 5 According to some embodiments Figure 4 A cross-sectional view of the knurling;

[0038] Figure 6 It is shown that according to some embodiments Figure 4 A curve showing the height of the knurling;

[0039] Figure 7 This is a perspective view of shielded electrical terminals according to some embodiments;

[0040] Figure 8 According to some embodiments Figure 7 A cross-sectional view of the shielded electrical terminals;

[0041] Figure 9 This is a perspective view of shielded electrical terminals according to some embodiments;

[0042] Figure 10 According to some embodiments Figure 9 An alternative perspective view of the shielded electrical terminals rotated approximately 90 degrees around the longitudinal axis;

[0043] Figure 11 According to some embodiments Figure 9 A cross-sectional view of the shielded electrical terminals;

[0044] Figure 12 It is according to some embodiments for forming Figure 9A top view of the prefabricated terminal component of the shielded electrical terminal;

[0045] Figure 13 yes Figure 1 , 7 A schematic cross-sectional view of the shielded electrical terminals of or 9, showing Figure 1 , 7 Or the air gap between the shielded electrical terminal of or 9 and the corresponding mating shielded terminal; and

[0046] Figure 14 This is a flowchart of a method for forming shielded electrical terminals according to some embodiments.

[0047] In the accompanying drawings, different forms of elements in various embodiments share the last two digits of the reference numerals. Detailed Implementation

[0048] This document describes a shielded electrical terminal and a method for forming such a terminal. The shielded electrical terminal is configured as an outer shielding terminal connected to the shielding conductor of a shielded cable and an inner shielding terminal sliding within the outer shielding terminal. Instead of having resilient contact arms to provide contact force between the inner and outer shielding terminals, the outer shielding terminal has a knurled pattern on its inner surface defining a plurality of protrusions and recesses. When the inner shielding terminal is received within the outer shielding terminal, these protrusions are in an interference fit with the inner shielding terminal, thereby providing electrical contact points between the inner and outer shielding connectors.

[0049] Figures 1 to 5A first example of an externally shielded electrical terminal or a female-shielded electrical terminal, hereinafter referred to as terminal 100, is shown. The terminal has a retaining portion 102 defining features configured to attach terminal 100 to a shielded cable (not shown). Terminal 100 also has a mating portion 104 mechanically and electrically connected to the retaining portion 102. The mating portion 104 has a hollow cylindrical shape and is configured to interconnect with a corresponding mating internally shielded electrical terminal or a male-shielded electrical terminal 10 received within the mating portion 104. The inner surface 106 of the mating portion 104 is knurled to define a plurality of recesses 108, which in the illustrated example are diamond-shaped recesses surrounded by a plurality of protrusions 110 extending above the inner surface 106. These protrusions 110 are formed by material displacement caused by the knurling process. The height of the protrusions 110 produced by the knurling process is fairly random; therefore, the plurality of protrusions 110 have uneven heights. Due to the rhomboid shape of the recess 108, the height of the protrusion 110 above the inner surface 106 varies around the periphery of the recess 108. This is because there is more material displacement near the obtuse corner 112 of the recess 108 than at the acute corner 114. The height of the protrusion 110 above the inner surface 106 can also vary due to tolerance variations in the knurling process. The rhomboid recesses 108 are arranged in offset rows and columns such that the major axis of the rhomboid recesses is approximately parallel to the longitudinal axis X of the terminal 100, and the minor axis of the rhomboid recesses is approximately perpendicular to the longitudinal axis X of the terminal 100. As used herein, "approximately" parallel or perpendicular means ±10° of absolute parallelism or perpendicularity.

[0050] When a mating terminal is received within terminal 100, at least a portion of the protrusion 110 on the inner surface 106 of the terminal forms an interface engagement with the outer surface of the mating terminal. The highest protrusion 110 from the inner surface 106 of terminal 100 is in mechanical and electrical contact with the outer surface of the mating terminal, thereby providing multiple electrical connections between terminal 100 and the mating terminal, which reduces connection resistance and improves shielding efficiency. The height of the protrusion 110 extending from the inner surface 106 is typically between 0.03 and 0.07 mm. Figure 13 As shown, the air gap 12 between terminal 100 and mating terminal 10 is reduced to less than 0.1 mm, preferably less than 0.08 mm, more preferably less than 0.05 mm, and even more preferably less than 0.03 mm, which further improves the shielding efficiency of the connection between the terminal and the mating terminal. The protrusions 110 with different heights also improve the resistance of terminal 100 to triboelectric corrosion, because higher protrusions 110 that may degrade due to abrasion are replaced by protrusions 110 with a lower original height than the initial protrusion 110 being contacted. The recess 108 can also serve as a storage place for triboelectric corrosion debris, so that the debris does not interfere with the electrical connection between terminal 100 and the mating terminal.

[0051] Each of the plurality of protrusions 110 provides a possible electrical contact point between the mating portion 104 and the corresponding mating terminal. Furthermore, due to the uneven height of the protrusions, abrasion of one or more contact points on the inner surface results in the creation of new electrical contact points at different protrusions on the inner surface. Thus, friction does not cause loss or degradation of electrical contact between the corresponding terminals. Moreover, knurling can be formed using a cost-effective and simple stamping process, thereby forming the plurality of protrusions 110, so the formation of the plurality of protrusions 110 does not significantly increase the cost of the terminals.

[0052] exist Figure 1 In the example shown in -6, the outer wall 116 of the mating portion is continuous, meaning that it does not define any holes, openings, slits, slots, gaps, breaks, holes, or openings, except for the opening 118 at the end receiving the mating terminal.

[0053] Figure 6 This is a graph showing the heights of the recess 108 and protrusion 104 in a mating portion 104 according to some embodiments. The inner surface 106 of the mating portion 104 is assigned a zero reference height. In some embodiments, the recess 108 is defined by a depth of approximately -20 to -40 micrometers (μm), while the protrusion 110 is defined by a height of approximately 15 to 25 μm. In some embodiments, the depth of the recess 108 is greater than the height of the protrusion 110. In some embodiments, this is the result of a knurling process, wherein the recess is formed using a press comprising multiple patterned dies. The protrusion 110 is formed by the movement of material during the formation of the recess 108. For example, in Figure 6 In the illustrated embodiment, the protrusion 110 with the greatest height will create a first contact point between the mating portion 104 and the corresponding mating terminal, while the protrusion 110 with the smaller height will (at least initially) not contact the corresponding mating terminal. As the protrusion 110 with the greatest height abrades and wears away from the mating terminal, the protrusion 110 with the initially smaller height will begin to contact the mating terminal. Thus, despite abrasion and wear, electrical contact can still be maintained between the mating portion 104 and the corresponding mating terminal. It has been observed that forming multiple protrusions 110 on the inner surface of the mating portion can protect them from premature deformation during the manufacturing process and during the transport and handling of the terminals.

[0054] Figure 7 and Figure 8 A second example of a shielded electrical terminal 200 is shown. In this example, the metal sheet forming the mating portion 204 is thinner than the metal sheet forming the fixing portion 202, such as... Figure 8As best shown. The advantage of this is that, due to the lower circumferential strength of the mating portion 204 provided by the thinner metal sheet, the insertion force required to insert the corresponding mating terminal into the mating portion 204 is smaller, while still providing attachment features in the fixing portion 202, such as... Figure 7 and Figure 8 The crimping wing shown is thick enough to securely attach the terminal to the shielded cable. The mating portion 204 defines an axial slot 220 of an end opening that extends parallel to the longitudinal axis X of the terminal 200 from the opening toward the retaining portion 202. This slot 220 of the end opening reduces the circumferential strength of the mating portion 204, thereby reducing the mating engagement force.

[0055] Figure 9 -11 illustrates a third example of a shielded electrical terminal 300. In this example, the mating portion 304 and the retaining portion 302 are formed from a single metal sheet and have the same thickness. The mating portion 304 defines an end-closed slot 322 extending parallel to the longitudinal axis X of the terminal 300. This end-closed slot 322 reduces the circumferential strength of the mating portion 304, thereby reducing the mating engagement force. Figure 12 The image shows a terminal preform 324 cut from a single metal sheet for terminal 300. The terminal preform is attached to a traction strip 326, which is used to transport the terminal preform 324 through a forming process, and subsequently transport the fully formed terminal 300. The traction strip is then later removed from the terminal 300.

[0056] Although Figures 1 to 12 The terminals shown are generally arranged parallel to or in a straight line with the shielded cable, but alternative embodiments of the terminals are conceivable, in which the terminals are arranged generally at right angles to the cable. In other alternative embodiments of the terminals, the fixing portion may be configured to interconnect with conductive traces on a printed circuit board. Furthermore, although Figure 1 The example terminal shown in -12 has protrusions and recesses defined as rhombuses, but alternative embodiments may have other shapes, such as square, rectangular, triangular, circular, oval, etc.

[0057] Figure 14 A flowchart of a method 400 for forming a shielded electrical terminal having a mating portion and a fixing portion is shown, the shielded electrical terminal being, for example, one of the terminals described above. The method includes the following steps:

[0058] Step a) 402, forming a terminal preform from the first metal sheet, including, for example, forming a terminal preform 324 from the first metal sheet.

[0059] Step b) 404, forming a plurality of protrusions in the surface of the terminal preform, including: forming a plurality of protrusions 110, 210, 310 in the surface of the terminal preform 324, for example, such that the plurality of protrusions extend from the surface.

[0060] Step c) 408, rolling the terminal preform into a cylindrical shape, includes: rolling the terminal preform 324 into a cylindrical shape, for example, to form mating portions 104, 204, 304, which have inner surfaces 106, 206, 306, configured to make electrical contact with corresponding cylindrical male shielded terminals inserted into the mating portions 104, 204, 304.

[0061] Step d) 406, forming a plurality of recesses in the surface, is an optional sub-step of step b), including: forming a plurality of recesses 108, 208, 308 in the inner surfaces 106, 206, 306 such that a plurality of protrusions 110, 210, 310 are arranged on the periphery of the plurality of recesses 108, 208, 308.

[0062] Step e) 410, forming a fixing portion from the first metal sheet, wherein the thickness of the mating portion is equal to the thickness of the fixing portion, is an optional step and includes: forming a fixing portion 302 from the first metal sheet, wherein the thickness of the mating portion 304 is equal to the thickness of the fixing portion 302. Then, the fixing portion 302 is attached to the mating portion 304 formed in step c).

[0063] Step f) 412, forming a fixing portion from a second metal sheet, wherein the thickness of the first metal sheet forming the mating portion is less than the thickness of the second metal sheet forming the fixing portion, is an optional step and includes: forming a fixing portion 202 from the second metal sheet, wherein the thickness of the first metal sheet forming the mating portion 204 is less than the thickness of the second metal sheet forming the fixing portion 202. Then, the fixing portion 202 is attached to the mating portion 204 formed in step c).

[0064] Step g) 414, inserting the corresponding cylindrical shielding terminals into the mating portions, is an optional step, including: inserting the corresponding cylindrical shielding terminals 100, 200, 300 into the mating portions, wherein the size, shape, and arrangement of the plurality of protrusions 110, 210, 310 are configured to minimize the air gap 12 formed between the inner surfaces 106, 206, 306 of the mating portions 104, 204, 304 and the corresponding cylindrical shielding terminals 10.

[0065] Therefore, a shielded electrical terminal and a method for manufacturing such a shielded electrical terminal are provided. Compared with prior art shielded terminals, this terminal and method offer the benefit of improved shielding efficiency due to lower connection resistance and reduced air gap between the terminal and mating terminal. This terminal and method also allow for improved resistance to frictional corrosion. This terminal and method also provide a terminal that reduces the required mating force when interconnecting with a mating terminal, thereby improving the ergonomics of connecting the terminal to the mating terminal.

[0066] While the invention has been described with reference to one or more exemplary embodiments, those skilled in the art will understand that various changes can be made and its elements can be replaced by equivalents without departing from the scope of the invention. Furthermore, various modifications can be made to adapt particular circumstances or materials to the teachings of the invention without departing from its main scope. Therefore, the invention is not intended to be limited to the one or more embodiments disclosed, but rather to include all embodiments falling within the appended claims.

Claims

1. A shielded electrical terminal (200), comprising: A fixing portion (202) is configured to attach the shielded electrical terminal (200) to the outer shielding conductor of the shielded cable; as well as A cylindrical mating portion (204) having an inner surface (206) configured to make electrical contact with a corresponding cylindrical shielding terminal inserted into the mating portion, wherein the inner surface (206) defines a plurality of protrusions (210) extending from the inner surface (206). The mating portion (204) is formed of a first metal sheet, and the fixing portion (202) is formed of a second metal sheet, wherein the thickness of the first metal sheet is less than the thickness of the second metal sheet. The fixing portion (202) is configured to provide a crimping wing and be attached to the mating portion (204), wherein the attachment of the mating portion (204) to the fixing portion (202) is located between a plurality of recesses (208) and the crimping wing and along the longitudinal axis (X) of the shielded electrical terminal (200). The inner surface (206) defines a knurled surface having the plurality of recesses (208), and wherein the plurality of protrusions (210) are arranged on the periphery of the plurality of recesses (208), wherein each of the plurality of recesses (208) is rhomboid.

2. The shielded electrical terminal (200) according to claim 1, characterized in that, The heights of the plurality of protrusions (210) are not uniform.

3. The shielded electrical terminal (200) according to claim 1, characterized in that, The long axes of the plurality of rhomboid recesses are aligned parallel to the longitudinal axis (X) of the shielded electrical terminal (200), and the short axes of the plurality of rhomboid recesses are aligned perpendicular to the longitudinal axis (X) of the shielded electrical terminal (100).

4. The shielded electrical terminal (200) according to claim 1, characterized in that, The outer wall of the mating portion (204) is continuous and does not limit the orifice extending through it.

5. The shielded electrical terminal (200) according to claim 1, characterized in that, The outer wall of the mating portion (204) defines an axial gap (220) aligned with the longitudinal axis (X) of the shielded electrical terminal (200).

6. A shielded electrical terminal (300), comprising: A fixing portion (302) is configured to attach the shielded electrical terminal (300) to the outer shielding conductor of the shielded cable; as well as A cylindrical mating portion (304) has an inner surface (306) configured to make electrical contact with a corresponding cylindrical shielding terminal inserted into the mating portion. The inner surface (306) defines a plurality of protrusions (310) extending from it. Both the mating portion (304) and the fixing portion (302) are formed of sheet metal, and the sheet metal forming the mating portion (304) has the same thickness as the sheet metal forming the fixing portion (302). The fixing portion (302) and the mating portion (304) are arranged along the longitudinal axis (X) of the shielded electrical terminal (300), wherein the fixing portion (302) is disposed at a first end of the shielded electrical terminal (300), and the mating portion (304) is disposed at a second end of the shielded electrical terminal (300) opposite to the first end. The inner surface (306) defines a knurled surface having a plurality of recesses (308), and wherein the plurality of protrusions (310) are arranged on the periphery of the plurality of recesses (308). Each of the plurality of recesses (308) is rhomboid in shape.

7. The shielded electrical terminal (300) according to claim 6, characterized in that, The heights of the plurality of protrusions (310) are not uniform.

8. The shielded electrical terminal (300) according to claim 6, characterized in that, The long axes of the plurality of rhomboid recesses (308) are aligned parallel to the longitudinal axis (X) of the shielded electrical terminal (300), and the short axes of the plurality of rhomboid recesses (308) are aligned perpendicular to the longitudinal axis (X) of the shielded electrical terminal (300).

9. The shielded electrical terminal (300) according to claim 6, characterized in that, The outer wall of the mating portion (304) is continuous and does not limit the orifice extending through it.

10. The shielded electrical terminal (300) according to claim 6, characterized in that, The outer wall of the mating portion (304) defines an axial gap aligned with the longitudinal axis (X) of the shielded electrical terminal (300).

11. A method (400) for forming a shielded electrical terminal (300), the shielded electrical terminal having a mating portion (304) and a fixing portion (302), the mating portion being configured to make electrical contact with a corresponding cylindrical shielded terminal inserted into the mating portion (304), the fixing portion being configured to attach the shielded electrical terminal (300) to the outer shielding conductor of a shielded cable, the method comprising: a) A terminal preform (324) is formed from a first metal sheet; b) A plurality of protrusions (310) are formed in the surface (306) of the terminal preform (324) such that the plurality of protrusions (310) extend from the surface (306); c) Rolling the terminal preform (324) into a cylindrical shape to form the mating portion (304), the mating portion having an inner surface (306) configured to make electrical contact with a corresponding cylindrical male shielding terminal inserted into the mating portion (106), wherein the surface is the inner surface of the mating portion (304); and d) A fixing portion (302) is formed from the first metal sheet, wherein the thickness of the mating portion (204) is equal to the thickness of the fixing portion (302), wherein the fixing portion (302) and the mating portion (304) are arranged along the longitudinal axis (X) of the shielded electrical terminal (300), wherein the fixing portion (302) is disposed at a first end of the shielded electrical terminal (300), and the mating portion (304) is disposed at a second end of the shielded electrical terminal (300) opposite to the first end. The characteristic feature is that step b) of forming a plurality of protrusions (310) on the surface of the terminal preform, such that the protrusions extend from the surface, further includes: e) A plurality of recesses (308) are formed on the surface such that a plurality of protrusions (310) are arranged on the periphery of the plurality of recesses (308), wherein each of the plurality of recesses (308) is rhomboid.

12. The method (400) according to claim 11, characterized in that, The plurality of protrusions (310) are formed such that they are non-uniform in height.

13. The method (400) according to claim 11, characterized in that, The plurality of protrusions and the plurality of recesses are formed using a knurling process.

14. The method (400) according to claim 12, characterized in that, The plurality of recesses (308) are formed such that the long axis of the plurality of rhomboid recesses (308) is aligned parallel to the longitudinal axis (X) of the shielded electrical terminal (300), and wherein the plurality of recesses (308) are formed such that the short axis of the plurality of rhomboid recesses (308) is aligned perpendicular to the longitudinal axis (X) of the shielded electrical terminal (300).

15. The method (400) according to claim 11, characterized in that, The outer wall of the mating part is continuous and does not limit the orifice extending through it.

16. The method according to claim 11, characterized in that, The outer wall of the mating portion (304) defines an axial gap aligned with the longitudinal axis (X) of the shielded electrical terminal (300).

17. The method (400) according to claim 11, characterized in that, Also includes: g) Insert the corresponding cylindrical shielding terminal into the mating portion (304), wherein the size, shape and arrangement of the plurality of protrusions (310) are configured to minimize the air gap formed between the inner surface (306) of the mating portion (304) and the corresponding cylindrical shielding terminal.

18. A method (400) for forming a shielded electrical terminal (200), the shielded electrical terminal having a mating portion (204) and a fixing portion (202), the mating portion being configured to make electrical contact with a corresponding cylindrical shielded terminal inserted therein, the fixing portion being configured to attach the shielded electrical terminal (200) to the outer shielding conductor of a shielded cable, the method comprising: a) A terminal preform is formed from a first metal sheet; b) A plurality of protrusions (210) are formed in the surface (206) of the terminal preform, such that the protrusions extend from the surface (206); c) The terminal preform is wound into a cylindrical shape to form the mating portion (204), the mating portion having an inner surface (206) configured to make electrical contact with a corresponding cylindrical male shielding terminal inserted into the mating portion (206), wherein the surface (206) is the inner surface (206) of the mating portion (204); and d) A fixing portion (202) is formed from a second metal sheet, the fixing portion being configured to provide a crimping wing, wherein the thickness of the first metal sheet forming the mating portion (204) is less than the thickness of the second metal sheet forming the fixing portion (202), and the fixing portion (202) is attached to the mating portion (204) formed in step c), wherein the attachment of the mating portion (204) to the fixing portion (202) is located between a plurality of recesses (208) and the crimping wing, and is arranged along the longitudinal axis (X) of the shielded electrical terminal (200). Step b) of forming a plurality of protrusions (210) in the surface (206) of the terminal preform (224) and extending the protrusions from the surface (206) further includes: e) Forming a plurality of recesses (208) on the surface, such that the plurality of protrusions are arranged on the peripheral edges of the plurality of recesses (208). Each of the plurality of recesses (208) is rhomboid in shape.

19. The method (400) according to claim 18, characterized in that, The multiple protrusions are formed to be uneven in height.

20. The method (400) according to claim 18, characterized in that, The plurality of protrusions and the plurality of recesses are formed using a knurling process.

21. The method (400) according to claim 18, characterized in that, The plurality of recesses are formed such that the long axis of the plurality of rhomboid recesses is aligned parallel to the longitudinal axis (X) of the shielded electrical terminal, and wherein the plurality of recesses are formed such that the short axis of the plurality of rhomboid recesses is aligned perpendicular to the longitudinal axis (X) of the shielded electrical terminal.

22. The method (400) according to claim 18, characterized in that, The outer wall of the mating part is continuous and does not limit the orifice extending through it.

23. The method (400) according to claim 18, characterized in that, The outer wall of the mating portion (304) defines an axial gap aligned with the longitudinal axis (X) of the shielded electrical terminal (300).

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