CN212849181U - Connector for coaxial cable - Google Patents

Abstract

The present disclosure relates to a connector for a coaxial cable, comprising: a center conductor including a proximal portion and a distal portion that are different in diameter from each other; an outer conductor provided with a stepped portion on an inner surface thereof; and a dielectric spacer disposed between the center conductor and the outer conductor, the dielectric spacer including a center conductor receiving portion and an outer conductor abutting portion connected to each other, the center conductor receiving portion being configured to completely receive a proximal portion of the center conductor in an inner chamber thereof, and the outer conductor abutting portion projecting radially outward from a proximal end portion of the center conductor receiving portion and abutting on a step portion of the outer conductor, wherein a maximum thickness of the outer conductor abutting portion in a longitudinal direction is 1 to 2 times a thickness of a side wall of the center conductor receiving portion in a radial direction. The connector of the present disclosure avoids the problem of voids or bubbles being created near the outer conductor abutment after the solder has cooled.

Description

Connector for coaxial cable

Technical Field

The present disclosure relates generally to the field of connectors. More particularly, the present disclosure relates to a connector for coaxial cables.

Background

Coaxial cables are commonly used in Radio Frequency (RF) communication systems. A typical coaxial cable includes a center conductor, an outer conductor, a layer of dielectric material separating the center conductor from the outer conductor, and a sheath covering the outer conductor. In radio frequency communication systems where higher accuracy and reliability are required, coaxial connectors may be used to terminate coaxial cables.

Fig. 1 shows a prior art coaxial connector 1 'comprising a center conductor 3', an outer conductor 5 ', and a dielectric spacer 4' located between the center conductor 3 'and the outer conductor 5'. The dielectric spacer 4 ' includes a center conductor receiving portion 41 ' and an outer conductor abutment portion 47 '. The center conductor receiving portion 41 'has a center through hole to fix a distal portion of the center conductor 3'. The outer conductor abutment 47 ' is cylindrical and has a hollow interior for receiving a proximal portion of the center conductor 3 ' and a proximal end face for abutting the exposed outer conductor layer 25 ' and the dielectric material layer 24 ' of the coaxial cable 2 '. Solder is placed in the space 54 ' between the inner surface of the outer conductor 5 ', the outer surface of the outer conductor layer 25 ' of the cable 2 ', and the proximal end face of the outer conductor abutment 47 ' to solder the outer conductor 5 ' and the outer conductor layer 25 '.

When the solder is heated, the generated heat diffuses outwards along the periphery, including in the direction towards the dielectric spacers 4'. However, since the side walls of the dielectric spacer 4 ' are thick in the longitudinal direction, heat is not easily diffused through the side walls, and therefore, the diffusion speed of heat is not uniform in the direction toward the dielectric spacer 4 ' and in other directions, whereby the solder can generate voids or bubbles that do not satisfy the performance requirements at the portion near the dielectric spacer 4 '.

In addition, the space 54 ' between the inner surface of the outer conductor 5 ', the outer surface of the outer conductor layer 25 ' of the cable 2 ', and the proximal end face of the outer conductor abutment 47 ' is narrow, and it is difficult to put solder therein.

Furthermore, the center conductor 3 ' needs to be connected to the center conductor 23 ' of the coaxial cable 2 ' by means of soldering. The soldering operation not only increases the cost of the solder, but also increases the number of operation steps.

SUMMERY OF THE UTILITY MODEL

The present disclosure provides a coaxial connector that overcomes at least one of the above-mentioned deficiencies of prior art products.

An aspect of the present disclosure relates to a coaxial connector for a coaxial cable, wherein the coaxial connector includes:

a center conductor including a proximal portion and a distal portion that are different in diameter from each other;

an outer conductor provided with a stepped portion on an inner surface thereof; and

a dielectric spacer disposed between the center conductor and the outer conductor, the dielectric spacer including a center conductor receiving portion and an outer conductor abutting portion connected to each other, the center conductor receiving portion being configured to completely receive a proximal portion of the center conductor in an inner chamber thereof, and the outer conductor abutting portion projecting radially outward from the proximal portion of the center conductor receiving portion and abutting on a step portion of the outer conductor, wherein a maximum thickness of the outer conductor abutting portion in a longitudinal direction is 1 to 2 times a thickness of a sidewall of the center conductor receiving portion in a radial direction.

In some embodiments, the outer conductor abutment has a stepped cross section and a step is provided between the central conductor receiving portion and the outer conductor abutment.

In some embodiments, the thickness of the outer conductor abutment in the longitudinal direction is substantially evenly distributed along the radial direction.

In some embodiments, a thickness of the outer conductor abutment in the longitudinal direction is substantially equal to a thickness of the sidewall of the center conductor receiver in the radial direction.

In some embodiments, the outer diameter of the outer conductor abutting portion is larger than the inner diameter of the stepped portion of the outer conductor, but smaller than the inner diameter of a portion of the outer conductor from the proximal end portion thereof to the stepped portion.

In some embodiments, the inner chamber of the center conductor receptacle has a diameter equal to or slightly larger than the outer diameter of the proximal portion of the center conductor and a length equal to or greater than the length of the proximal portion of the center conductor.

In some embodiments, the distal portion of the center conductor is exposed from the center conductor receiving portion and extends distally.

In some embodiments, a step is provided between the proximal portion and the distal portion of the center conductor, the distal end of the center conductor receiving portion is provided with a flange projecting radially inward, and the step of the center conductor abuts against the flange of the center conductor receiving portion, the distal portion of the center conductor projecting outward from the central hole of the flange of the center conductor receiving portion.

In some embodiments, the proximal portion of the center conductor is provided with a recess recessed inwardly from its proximal end face, the recess configured to receive the center conductor of the coaxial cable.

In some embodiments, the center conductor is provided with a plurality of fingers on a sidewall surrounding the recess, and the plurality of fingers are evenly or unevenly spaced from each other by a gap.

In some embodiments, the fingers have resilient free ends that are cantilevered and project proximally from the bottom of the recess.

In some embodiments, the inner profile of the plurality of fingers forms a circle having an inner diameter slightly less than or equal to the outer diameter of the center conductor of the coaxial cable.

In some embodiments, the step of the outer conductor is closer to the proximal end of the outer conductor than the distal end of the outer conductor.

In some embodiments, a space is formed between an inner surface of the outer conductor proximate the proximal end portion thereof and an outer surface of the outer conductor layer of the coaxial cable, and the space is configured to place solder to solder the outer conductor and the outer conductor layer of the coaxial cable together.

In some embodiments, the inner diameter of the portion of the outer conductor near its proximal end gradually increases in the proximal direction, forming an expanded opening portion.

In some embodiments, the coaxial connector further comprises a fastener, and the fastener is configured to fasten the coaxial connector to a mating connector.

In some embodiments, the fastener is provided with a radially inwardly projecting flange at its proximal end, the outer conductor includes a retaining ring projecting radially outwardly from its outer surface, and the fastener is rotatably connected to the outer conductor by its flange abutting against the retaining ring and surrounding the distal end of the outer conductor.

In some embodiments, the retention ring is located at a position between the distal end and the proximal end of the outer conductor in the longitudinal direction.

In some embodiments, the fastener secures the coaxial connector to the mating connector by a threaded connection.

Another aspect of the present disclosure relates to a coaxial connector for a coaxial cable, wherein the coaxial connector comprises:

a center conductor including a proximal portion and a distal portion that are different in diameter from each other;

an outer conductor provided with a stepped portion on an inner surface thereof; and

a dielectric spacer disposed between the center conductor and the outer conductor, the dielectric spacer including a center conductor receiving portion and an outer conductor abutting portion connected to each other, the center conductor receiving portion being configured to fully receive a proximal portion of the center conductor in an inner chamber thereof, and the outer conductor abutting portion projecting radially outward from a proximal end portion of the center conductor receiving portion and abutting on a step portion of the outer conductor, wherein the outer conductor abutting portion has a stepped cross section.

Additional features and advantages of the disclosed subject technology will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosed subject technology. The advantages of the subject technology of the present disclosure will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the subject technology of the present disclosure as claimed.

Drawings

Various aspects of the disclosure will be better understood upon reading the following detailed description in conjunction with the drawings in which:

FIG. 1 shows a cross-sectional view of a prior art coaxial connector terminated to a coaxial cable;

fig. 2 shows a cross-sectional view of a coaxial connector terminated to a coaxial cable according to an embodiment of the present disclosure;

FIG. 3 shows a perspective view of the prepared end of the coaxial cable shown in FIG. 2; and

fig. 4A and 4B show a sectional view and a perspective view of the coaxial connector shown in fig. 2.

Detailed Description

The present disclosure will now be described with reference to the accompanying drawings, which illustrate several embodiments of the disclosure. It should be understood, however, that the present disclosure may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, the embodiments described below are intended to provide a more complete disclosure of the present disclosure, and to fully convey the scope of the disclosure to those skilled in the art. It is also to be understood that the embodiments disclosed herein can be combined in various ways to provide further additional embodiments.

It should be understood that like reference numerals refer to like elements throughout the several views. In the drawings, the size of some of the features may be varied for clarity.

It is to be understood that the terminology used in the description is for the purpose of describing particular embodiments only, and is not intended to be limiting of the disclosure. All terms (including technical and scientific terms) used in the specification have the meaning commonly understood by one of ordinary skill in the art unless otherwise defined. Well-known functions or constructions may not be described in detail for brevity and/or clarity.

As used in this specification, the singular forms "a", "an" and "the" include plural referents unless the content clearly dictates otherwise. The terms "comprising," "including," and "containing" when used in this specification specify the presence of stated features, but do not preclude the presence or addition of one or more other features. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items. The terms "between X and Y" and "between about X and Y" as used in the specification should be construed to include X and Y. The term "between about X and Y" as used herein means "between about X and about Y" and the term "from about X to Y" as used herein means "from about X to about Y".

In the description, when an element is referred to as being "on," "attached" to, "connected" to, "coupled" to, or "contacting" another element, etc., another element may be directly on, attached to, connected to, coupled to, or contacting the other element, or intervening elements may be present. In contrast, when an element is referred to as being "directly on," "directly attached to," directly connected to, "directly coupled to," or "directly contacting" another element, there are no intervening elements present. In the description, one feature is disposed "adjacent" another feature, and may mean that one feature has a portion overlapping with or above or below an adjacent feature.

In the specification, spatial relations such as "upper", "lower", "left", "right", "front", "rear", "high", "low", and the like may explain the relation of one feature to another feature in the drawings. It will be understood that the spatial relationship terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, features originally described as "below" other features may be described as "above" other features when the device in the figures is inverted. The device may also be otherwise oriented (rotated 90 degrees or at other orientations) and the relative spatial relationships may be interpreted accordingly.

Fig. 2 shows a schematic connection state of the coaxial connector 1 and the coaxial cable 2 according to an embodiment of the present disclosure. The coaxial connector 1 electrically and mechanically connects a coaxial cable 2 to another coaxial cable or communication equipment by mating with a mating connector. As shown, the coaxial cable 2 includes a center conductor 23, a dielectric material layer 24 surrounding the center conductor 23, and an outer conductor layer 25 surrounding the dielectric material layer 24. In fig. 2, the outer conductor layer 25 is shown as being corrugated to facilitate bending and/or buckling of the coaxial cable 2; in other embodiments, the outer conductor layer 25 may also have a relatively smooth and uniform diameter. The outer conductor layer 25 may be surrounded by a protective sheath 26.

Fig. 3 shows an end portion of a coaxial cable 2 that has been prepared for termination with a coaxial connector 1. As shown, a length of the sheath 26 is removed from the end of the coaxial cable 2 to expose the underlying outer conductor layer 25. Thereafter, the outer conductor layer 25 and underlying dielectric material layer 24 are removed from a distal length of the exposed outer conductor layer 25 to expose a length of the center conductor 23. Thereby, on the end portion of the coaxial cable 2, the exposed outer conductor layer 25 projects outwardly from the outer end face of the sheath 26, and the exposed center conductor 23 projects outwardly from the outer end faces of the outer conductor layer 25 and the dielectric material layer 24.

Fig. 4A and 4B show a sectional view and a perspective view of the coaxial connector 1. As shown, the coaxial connector 1 includes a center conductor 3, an outer conductor 5, and a dielectric spacer 4 disposed between the center conductor 3 and the outer conductor 5. The center conductor 3 and the outer conductor 5 are each made of metal and have conductivity. The center conductor 3 is electrically and mechanically connected to the center conductor 23 of the coaxial cable 2 for transmitting RF signals. The outer conductor 5 is electrically and mechanically connected to the outer conductor layer 25 of the coaxial cable 2 for transmitting RF signals and for electrically shielding the radially inner center conductor. The dielectric spacer 4 serves to insulate and space apart the center conductor 3 and the outer conductor 5.

The outer conductor 5 has a substantially hollow cylindrical shape, and has an open distal end portion 51 and a proximal end portion 52. The outer conductor 5 receives the dielectric spacer 4 in a hollow interior intermediate the distal end portion 51 and the proximal end portion 52, receives the outer conductor layer 25 of the prepared end portion of the coaxial cable 2 in the hollow interior near the proximal end portion 52, and is received in the outer conductor of the mating connector at a portion near the distal end portion 51. The inner diameter of the portion of the outer conductor 5 near the proximal end 52 is larger than the outer diameter of the bare outer conductor layer 25 of the prepared end of the coaxial cable 2, so that a space 54 (see fig. 2) is formed between the inner surface of the outer conductor 5 near the proximal end 52 and the outer surface of the outer conductor layer 25 of the coaxial cable 2. This space 54 is used for placing solder to solder the outer conductor 5 and the outer conductor layer 25 of the coaxial cable 2 together, thereby establishing stable electrical and mechanical connection between the outer conductor 5 and the outer conductor layer 25. In some embodiments, the inner diameter of the portion of the outer conductor 5 near the proximal end portion 52 gradually increases in the proximal direction, thereby forming an expanded opening portion. The flared opening of the outer conductor 5 facilitates easier insertion of various solders (e.g., solder rings, solder wires, etc.) and other preforms.

The center conductor 3 has a substantially elongated cylindrical shape. The center conductor 3 includes a distal portion 31 having a smaller diameter and a proximal portion 32 having a larger diameter, and a step 33 is formed between the distal portion 31 and the proximal portion 32. A distal portion 31 is exposed from the dielectric spacer 4 and extends distally for electrical and mechanical connection to the center conductor of the mating connector. The proximal portion 32 is received within the dielectric spacer 4 and is used to electrically and mechanically connect to the bare center conductor 23 of the prepared end of the coaxial cable 2. The proximal portion 32 is provided with a recess 34 recessed inwardly from its proximal end face for receiving the bare center conductor 23 of the coaxial cable 2. In some embodiments, the center conductor 3 is provided with a plurality of fingers 35 on a sidewall surrounding the recess 34, and the fingers 35 are evenly or unevenly spaced from each other by a gap. The fingers 35 have elastic free ends in cantilever form and project in a proximal direction from the bottom of the recess 34. The inner diameter of the circle formed by the inner contours of these fingers 35 is slightly smaller than or equal to the outer diameter of the center conductor 3 of the coaxial cable 2, and the center conductor 23 of the coaxial cable 2 can be easily inserted into the recess 34 against the elastic force of the fingers 35. After insertion, the fingers 35 firmly grip the center conductor 23 of the coaxial cable 2 by their elastic force, thereby establishing a stable electrical and mechanical connection between the center conductor 3 and the center conductor 23 of the coaxial cable 2. In some embodiments, the recess 34 of the center conductor 3 may be free of the finger 35, but connected to the center conductor 23 of the coaxial cable 2 by interference fit, threaded connection, or welding, etc.

The dielectric spacer 4 serves to fix the center conductor 3 at a radially central position of the outer conductor 5 and to insulate and space the center conductor 3 and the outer conductor 5. The dielectric spacer 4 includes a center conductor receiving portion 41 and an outer conductor abutting portion 47 connected to each other, and the center conductor receiving portion 41 is located on the far side of the outer conductor abutting portion 47.

The central conductor receiving portion 41 is generally hollow cylindrical in shape and includes an interior chamber 46, and open distal and proximal end portions 42, 43. The distal portion 42 is provided with a radially inwardly projecting annular flange 44, and the annular flange 44 surrounds the central bore 45, while the proximal portion 43 is not provided with a radially inwardly projecting annular flange. The diameter of the inner chamber 46 is equal to or slightly larger than the outer diameter of the proximal portion 32 of the center conductor 3, and the length of the inner chamber 46 is equal to or larger than the length of the proximal portion 32, so that the proximal portion 32 can be completely contained within the inner chamber 46 and not exposed from the inner chamber 46. The diameter of the central bore 45 of the distal end portion 42 is slightly larger than the outer diameter of the distal portion 31 of the center conductor 3, but smaller than the outer diameter of the proximal portion 32, so that the step 33 of the center conductor 3 can abut against the inner surface of the annular flange 44, and the distal portion 31 projects outwardly from the central bore 45.

The outer conductor abutment portion 47 is generally annular and projects radially outwardly from the proximal end portion 43 of the center conductor receiving portion 41. The outer conductor 5 is provided with a step portion 55 on an inner surface thereof, and the step portion 55 is closer to the proximal end portion 52 of the outer conductor 5 with respect to the distal end portion 51 of the outer conductor 5. The outer diameter of outer conductor abutting portion 47 is larger than the inner diameter of step portion 55, but smaller than the inner diameter of the portion of outer conductor 5 from proximal end portion 52 to step portion 55, so that outer conductor abutting portion 47 can enter the hollow interior from proximal end portion 52 of outer conductor 5 and abut on step portion 55 of outer conductor 5. The outer conductor abutment 47 may have a stepped cross-section and a step 48 is provided between the central conductor receiving portion 41 and the outer conductor abutment 47 to optimise the performance of the standing wave. The maximum thickness of the outer conductor abutment 47 in the longitudinal direction may be between about 1 and about 2 times the thickness of the sidewall of the center conductor-receiving portion 41 in the radial direction. In other embodiments, the outer conductor abutment 47 may not be provided with the step 48, and the thickness in the longitudinal direction is substantially evenly distributed along the radial direction and is between about 1 and about 2 times the thickness of the sidewall of the center conductor receiving portion 41 in the radial direction. In some embodiments, the thickness of the outer conductor abutment 47 in the longitudinal direction is substantially equal to the thickness of the sidewall of the center conductor receptacle 41 in the radial direction.

The coaxial connector 1 further comprises a fastener 6, and the fastener 6 is used to fasten the coaxial connector 1 to a mating connector. In the illustrated embodiment, the fastener 6 is a coupling nut. The fastener 6 is substantially cylindrical and is provided with a flange 61 projecting radially inward at its proximal end portion. The outer conductor 5 includes a retaining ring 34 that projects radially outward from its outer surface, and the retaining ring 34 is located at a position between the distal end portion 51 and the proximal end portion 52 in the longitudinal direction. The inner diameter of the flange 61 of the fastener 6 is larger than the outer diameter of the outer surface of the outer conductor 5, but smaller than the outer diameter of the retaining ring 34. Thus, the fastener 6 is rotatably connected to the outer conductor 5 by the flange 61 abutting on the retaining ring 34 and surrounds the distal end portion 51 of the outer conductor 5. The fastener 6 has an internal thread formed on an inner surface thereof to removably engage an external threaded portion of a mating connector. In other embodiments, the fastener 6 may have external threads to be received in an internally threaded portion of a mating connector. The fastener 6 may have a hexagonal outer profile to allow a hex wrench to tighten the fastener 6 to a mating externally threaded connector. In other embodiments, the fastener 6 may have other shapes of outer contours. The fastener 6 may be made of metal and have conductivity. A gasket may be disposed within the fastener 6 and surrounding the distal end 51 of the outer conductor 5 to form a moisture-tight seal therebetween.

The connection procedure of the coaxial connector 1 and the coaxial cable 2 according to the embodiment of the present disclosure will be described below with reference to fig. 2. First, the connection end portion of the coaxial cable 2 is prepared such that the bare outer conductor layer 25 projects outwardly from the outer end face of the sheath 26, and the bare center conductor 23 projects outwardly from the outer end faces of the outer conductor layer 25 and the dielectric material layer 24.

The bare center conductor 23 of the coaxial cable 2 is inserted into the recess 34 of the center conductor 3, and the finger 35 of the center conductor 3 firmly grips the center conductor 23 of the coaxial cable 2 by an elastic force.

The center conductor 3 of the coaxial connector 1 is inserted into the center conductor receiving portion 41 of the dielectric spacer 4 such that the proximal portion 32 of the center conductor 3 is fully received within the interior chamber 46 of the center conductor receiving portion 41, the step 33 abuts against the interior surface of the annular flange 44 of the center conductor receiving portion 41, and the distal portion 31 projects outwardly from the central bore 45 of the center conductor receiving portion 41.

The dielectric spacer 4 of the coaxial connector 1 is pushed into the outer conductor 5 together with the prepared end of the coaxial cable 2 from the proximal end 51 of the outer conductor 5 until the outer conductor abutment 47 of the dielectric spacer 4 abuts against the step 55 in the outer conductor 5.

Solder (typically in the form of a solder ring or wire) is inserted into the space 54 between the exposed outer conductor layer 25 of the coaxial cable 2 and the inner surface of the outer conductor 5, and the outer conductor 5 and the outer conductor layer 25 of the coaxial cable 2 are soldered together by heating the solder.

Thereby, stable electrical and mechanical connections between the outer conductor 5 and the outer conductor layer 25 of the coaxial cable 2, and between the center conductor 3 and the center conductor 23 of the coaxial cable 2 are established.

The coaxial connector 1 according to the embodiment of the present disclosure significantly reduces the thickness of the outer conductor abutting portion 47 of the dielectric spacer 4, thereby making the heat dissipation speed of the solder more uniform in all directions, and avoiding the problem of voids or bubbles in the vicinity of the outer conductor abutting portion 47 after the solder cools.

The coaxial connector 1 according to the embodiment of the present disclosure uses the elastic fingers 35 of the center conductor 3 to grip the center cable 23 of the coaxial cable 2, which is simple to operate and effectively saves the solder cost and the time required for soldering.

The coaxial connector 1 according to the embodiment of the present disclosure adopts the shape of an expanded opening at the proximal opening of its outer conductor 5 and is shortened in length, thereby facilitating the insertion of a smaller solder and even the insertion of a wire.

Although exemplary embodiments of the present disclosure have been described, it will be understood by those skilled in the art that various changes and modifications can be made to the exemplary embodiments of the present disclosure without substantially departing from the spirit and scope of the present disclosure. Accordingly, all changes and modifications are intended to be included within the scope of the present disclosure as defined in the appended claims. The disclosure is defined by the following claims, with equivalents of the claims to be included therein.

Claims (20)

1. A coaxial connector for a coaxial cable, the coaxial connector comprising:

a center conductor including a proximal portion and a distal portion that are different in diameter from each other;

an outer conductor provided with a stepped portion on an inner surface thereof; and

a dielectric spacer disposed between the center conductor and the outer conductor, the dielectric spacer including a center conductor receiving portion and an outer conductor abutting portion connected to each other, the center conductor receiving portion being configured to completely receive a proximal portion of the center conductor in an inner chamber thereof, and the outer conductor abutting portion projecting radially outward from the proximal portion of the center conductor receiving portion and abutting on a step portion of the outer conductor, wherein a maximum thickness of the outer conductor abutting portion in a longitudinal direction is 1 to 2 times a thickness of a sidewall of the center conductor receiving portion in a radial direction.

2. The coaxial connector of claim 1, wherein the outer conductor abutment portion has a stepped cross-section and a step is provided between the center conductor receiving portion and the outer conductor abutment portion.

3. The coaxial connector of claim 1, wherein the outer conductor abutment has a thickness in the longitudinal direction that is substantially evenly distributed along the radial direction.

4. The coaxial connector of claim 3, wherein a thickness of the outer conductor abutment portion in the longitudinal direction is substantially equal to a thickness of the sidewall of the center conductor receiving portion in the radial direction.

5. The coaxial connector according to claim 1, wherein an outer diameter of the outer conductor abutting portion is larger than an inner diameter of the stepped portion of the outer conductor but smaller than an inner diameter of a portion of the outer conductor from a proximal end portion thereof to the stepped portion.

6. The coaxial connector of any one of claims 1-5, wherein the inner chamber of the center conductor receptacle has a diameter equal to or slightly larger than an outer diameter of the proximal portion of the center conductor and a length equal to or greater than a length of the proximal portion of the center conductor.

7. The coaxial connector of any one of claims 1-5, wherein the distal portion of the center conductor is exposed from the center conductor receiver and extends distally.

8. The coaxial connector of claim 7, wherein a step is provided between the proximal portion and the distal portion of the center conductor, the distal end of the center conductor receiving portion is provided with a radially inwardly projecting flange, and the step of the center conductor abuts against the flange of the center conductor receiving portion, the distal portion of the center conductor projecting outwardly from the central bore of the flange of the center conductor receiving portion.

9. The coaxial connector of any of claims 1-5, wherein the proximal portion of the center conductor is provided with a recess recessed inwardly from a proximal end face thereof, the recess configured to receive the center conductor of the coaxial cable.

10. The coaxial connector of claim 9, wherein the center conductor is provided with a plurality of fingers on a sidewall surrounding the recess, and the plurality of fingers are evenly or unevenly spaced from each other by a gap.

11. The coaxial connector of claim 10, wherein the fingers have resilient free ends that are cantilevered and project proximally from the bottom of the recess.

12. The coaxial connector of claim 10, wherein an inner diameter of a circle formed by the inner profiles of the plurality of fingers is slightly less than or equal to an outer diameter of a center conductor of a coaxial cable.

13. The coaxial connector of any of claims 1-5, wherein the step portion of the outer conductor is closer to the proximal end portion of the outer conductor than the distal end portion of the outer conductor.

14. The coaxial connector of any of claims 1-5, wherein an inner surface of the outer conductor proximate the proximal end portion thereof and an outer surface of the outer conductor layer of the coaxial cable form a space therebetween, and wherein the space is configured to receive solder to solder the outer conductor and the outer conductor layer of the coaxial cable together.

15. The coaxial connector according to any one of claims 1 to 5, wherein an inner diameter of a portion of the outer conductor near the proximal end portion thereof gradually increases in a proximal direction, thereby forming an expanded opening portion.

16. The coaxial connector of any of claims 1-5, further comprising a fastener, and wherein the fastener is configured to fasten the coaxial connector to a mating connector.

17. The coaxial connector of claim 16, wherein the fastener is provided with a radially inwardly projecting flange at its proximal end, the outer conductor includes a retaining ring projecting radially outwardly from its outer surface, and the fastener is rotatably connected to the outer conductor by its flange abutting against the retaining ring and surrounding the distal end of the outer conductor.

18. The coaxial connector of claim 17, wherein the retaining ring is located in the longitudinal direction at a position between the distal end and the proximal end of the outer conductor.

19. The coaxial connector of claim 16, wherein the fastener secures the coaxial connector to the mating connector by a threaded connection.

20. A coaxial connector for a coaxial cable, the coaxial connector comprising:

a center conductor including a proximal portion and a distal portion that are different in diameter from each other;

an outer conductor provided with a stepped portion on an inner surface thereof; and

a dielectric spacer disposed between the center conductor and the outer conductor, the dielectric spacer including a center conductor receiving portion and an outer conductor abutting portion connected to each other, the center conductor receiving portion being configured to fully receive a proximal portion of the center conductor in an inner chamber thereof, and the outer conductor abutting portion projecting radially outward from a proximal end portion of the center conductor receiving portion and abutting on a step portion of the outer conductor, wherein the outer conductor abutting portion has a stepped cross section.

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