JP2013098121A - Coaxial connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coaxial connector that can be strongly fixed to a coaxial cable and can prevent characteristic impedance from deviating from a predetermined characteristic impedance.SOLUTION: A housing 12 includes: a cylindrical part 20 having a central axis substantially orthogonal to an extension direction in which a coaxial cable 220 extends; and a holding part 23 extending from the cylindrical part 20 along the coaxial cable 220. A bushing 14 is attached to the housing 12. A socket 16 is located at the center of the cylindrical part 20 when plan-viewed from a direction in which the central axis extends, and is insulated from the housing 12 by the bushing 14 and is connected to a center conductor 224. The holding part 23 includes: a swaging part 28 to hold an external conductor 222; and a contact part 30 that contacts with an insulating film 221. Protrusions 60a and 60b, each having an insulating portion formed at an end thereof, are provided on a surface of the insulating film 221 on which the contact part 30 is contacted.

Description

  The present invention relates to a coaxial connector, and more particularly to a coaxial connector attached to the tip of a coaxial cable.

  As a conventional coaxial connector, for example, a coaxial connector described in Patent Document 1 is known. The coaxial connector includes a connecting member that is wound around an outer covering material of a coaxial cable. The connecting member is provided with a plurality of protrusions that pierce the exterior coating material. Thereby, a coaxial connector comes to be firmly connected with respect to a coaxial cable.

  However, in the coaxial connector described in Patent Document 1, the characteristic impedance may deviate from the desired characteristic impedance. More specifically, the connecting member is made of a thin metal plate. For this reason, when the protrusion pierces the exterior coating material, the protrusion approaches the central conductor of the coaxial cable. As a result, a capacitance is formed between the protrusion and the coaxial cable, and the characteristic impedance of the coaxial connector deviates from a desired characteristic impedance (for example, 50Ω).

JP-A-5-217638

  Accordingly, an object of the present invention is to provide a coaxial connector that can be firmly fixed to a coaxial cable and that can suppress a characteristic impedance from deviating from a predetermined characteristic impedance.

  A coaxial connector according to an aspect of the present invention includes a first center conductor, an insulator provided around the first center conductor, a first outer conductor provided around the insulator, and A coaxial cable formed of an insulating coating provided around the first outer conductor, wherein the insulating coating is removed at the tip to expose the first outer conductor and A coaxial connector attached to a coaxial cable from which the outer conductor is removed and the insulator is exposed, the cylindrical portion having a central axis substantially orthogonal to the extending direction in which the coaxial cable extends; And a housing including a holding portion extending along the coaxial cable from the cylindrical portion, a bushing attached to the housing, and the plan view when viewed from the direction in which the central axis extends. Cylindrical part A socket located in the center and insulated from the housing by the bushing, the socket being connected to the first central conductor, and the holding portion is provided with the first external portion. A protrusion having a first caulking portion for holding a conductor and a contact portion in contact with the insulating coating, and an insulating portion formed at a tip of the contact portion in contact with the insulating coating Is provided.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to fix to a coaxial cable firmly, it can suppress that characteristic impedance shifts | deviates from predetermined | prescribed characteristic impedance.

1 is an external perspective view of a coaxial connector according to an embodiment of the present invention. It is a disassembled perspective view of a coaxial connector. It is a cross-section figure of a coaxial connector. It is a perspective view in the middle of the assembly of the housing of a coaxial connector. It is a disassembled perspective view in the middle of the assembly of a coaxial connector. It is a disassembled perspective view in the middle of the assembly of a coaxial connector. It is the graph which showed the result of computer simulation. It is the graph which showed the result of computer simulation. It is an external appearance perspective view of the coaxial connector which concerns on a modification. It is a disassembled perspective view of the coaxial connector which concerns on a modification.

  A coaxial connector according to an embodiment of the present invention will be described below with reference to the drawings.

(Configuration of coaxial connector)
FIG. 1 is an external perspective view of a coaxial connector 10 according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the coaxial connector 10. FIG. 3 is a cross-sectional structure diagram of the coaxial connector 10. FIG. 4 is a perspective view of the coaxial connector 10 during the assembly of the housing 12. 1 to 3 (see FIG. 2 in particular), a direction in which the housing 12, the bushing 14, and the socket 16 are overlapped is defined as a z-axis direction. The positive direction in the z-axis direction is a direction from the housing 12 toward the socket 16. The direction in which the coaxial cable 220 extends is defined as the x-axis direction, and the direction orthogonal to the x-axis direction and the z-axis direction is defined as the y-axis direction. A positive direction in the x-axis direction is a direction from the coaxial cable 220 toward the socket 16. The x-axis direction is orthogonal to the z-axis direction.

  As shown in FIGS. 1 and 2, the coaxial connector 10 includes a housing 12, a bushing 14, and a socket 16. As shown in FIGS. 3A and 3B, the coaxial connector 10 can be attached to and detached from the receptacle 230 shown having an outer conductor 232 and a center conductor 234.

  As shown in FIG. 2, the coaxial cable 220 includes an insulating coating 221, an outer conductor 222, an insulator 223, and a center conductor 224. The insulator 223 is provided around the central conductor 224 and has elasticity. The outer conductor 222 is provided around the insulator 223. The insulating coating 221 is provided around the outer conductor 222 and has elasticity. In addition, the insulating coating 221 is removed at the tip of the coaxial cable 220 to expose the outer conductor 222. Further, the outer conductor 222 is removed at the tip of the coaxial cable 220 to expose the insulator 223.

  The housing 12 is made of a single metal plate (for example, spring phosphor bronze), and includes a cylindrical portion 20, a back surface portion 21, a holding portion 23, and a fixing portion 24 as shown in FIGS. .

  The cylindrical portion 20 has a central axis extending in the z-axis direction, and as illustrated in FIG. 4, the cylindrical portion 20 is positioned on the positive side in the z-axis direction and on the negative direction side in the z-axis direction. It has an opening O2. However, a part of the cylindrical portion 20 (a portion on the negative direction side in the x-axis direction) is notched.

  The back surface portion 21 is connected to the cylindrical portion 20 and is a plate-like member that is bent by 90 degrees from the state of FIG. 4 and covers the opening O2 of the cylindrical portion 20 as shown in FIG. A bushing 14 is placed on the back surface portion 21.

  The fixing portion 24 is connected to the cylindrical portion 20 and sandwiches the bushing 14 from both sides in the y-axis direction as shown in FIG. As shown in FIG. 4, the fixing portion 24 is provided at each of the end portions of the cylindrical portion 20 when the opening O <b> 1 is viewed from the positive direction side in the z-axis direction. More specifically, the two fixing portions 24 are plate-like members that extend from two end portions formed by cutting out the cylindrical portion 20 to the negative side in the x-axis direction and face each other. It is.

  Further, the fixed portion 24 is provided with a bending portion 33. As shown in FIG. 4, the bending portion 33 is formed by bending a part of the fixing portion 24 toward the positive direction side or the negative direction side in the y-axis direction so that the interval between the fixing portions 24 is widened.

  As shown in FIGS. 1 and 2, the holding portion 23 extends from the cylindrical portion 20 along the coaxial cable 220, and is specifically connected to the negative side of the back surface portion 21 in the x-axis direction. ing. As shown in FIG. 4, the holding portion 23 has caulking portions 26 and 28 and a contact portion 30.

  As shown in FIG. 2, the caulking portion 26 is a U-shaped plate-like member provided on the negative direction side of the back surface portion 21 in the x-axis direction before the coaxial connector 10 is assembled. The caulking portion 26 is wound around the bushing 14, the fixing portion 24, and the insulator 223 by being bent as shown in FIG. 1. As a result, the caulking portion 26 is in pressure contact with the fixing portion 24 and the insulator 223. At this time, the fixing portion 24 and the insulator 223 are pressed against the bushing 14 by being pushed by the caulking portion 26. Therefore, the fixing part 24 and the caulking part 26 hold the bushing 14. As described above, the caulking portion 26 plays a role of fixing the bushing 14, the socket 16, and the coaxial cable 220 to the housing 12.

  As shown in FIG. 4, the caulking portion 28 is a U-shaped plate-like member provided on the negative side of the caulking portion 26 in the x-axis direction before the coaxial connector 10 is assembled. The caulking portion 28 is bent as shown in FIG. 1 and is wound around the outer conductor 222 to hold the outer conductor 222 of the coaxial cable 220. Thereby, the caulking portion 28 plays a role of fixing the coaxial cable 220 to the housing 12.

  As shown in FIGS. 2 and 4, the contact portion 30 is a flat member provided on the negative side of the caulking portion 28 in the x-axis direction. As shown in FIG. 1, the contact portion 30 contacts the insulating coating 221 when the caulking portion 28 is wound around the outer conductor 222.

  Further, the surface of the contact portion 30 that contacts the insulating coating 221 (that is, the surface on the positive direction side in the z-axis direction) is provided with protrusions 60a and 60b that protrude toward the positive direction side in the z-axis direction. . The protrusions 60a and 60b have a pointed shape at the front end on the positive side in the z-axis direction, and specifically, are triangular prisms that are laid down. The protrusions 60a and 60b are arranged so as to be aligned in the y-axis direction.

  Furthermore, insulating portions are formed on the surfaces of the protrusions 60a and 60b by applying an insulating material such as resin. The protrusions 60a and 60b come into the insulating coating 221 when the contact portion 30 contacts the insulating coating 221. Accordingly, the protrusions 60 a and 60 b serve to fix the coaxial cable 220 to the housing 12. The height of the metal portions of the protrusions 60a and 60b in the z-axis direction is, for example, 20 μm or more and 100 μm or less.

  For example, the insulating part may be formed by applying fluorine having a dielectric constant of less than 2.3, or may be formed by spraying ceramic such as alumina having a dielectric constant of 9 to 10, or having a dielectric constant of 4.4 Plastic such as epoxy may be sprayed. The height of the insulating part in the z-axis direction is preferably 10 μm or more and 100 μm or less.

  The insulating portion only needs to be formed at least at the tip of the protrusions 60a and 60b. Therefore, it is preferable that the surface of the metal portion at the tips of the protrusions 60a and 60b is processed so as to be rougher than other portions. Thereby, it is suppressed that an insulating part peels.

  The bushing 14 is made of an insulator made of resin (for example, liquid crystal polymer), and plays a role of insulating the housing 12 and the socket 16. The bushing 14 is attached to the housing 12 and includes a circular portion 36 and a holding portion 38 as shown in FIG.

  The circular portion 36 plays a role of holding the socket 16 and is composed of a back surface portion 39 and a cylindrical portion 41 as shown in FIG. The back surface portion 39 is a plate-like member having a circular shape when viewed in plan from the z-axis direction. When the bushing 14 is attached to the housing 12, the back surface portion 39 is accommodated in the cylindrical portion 20 as shown in FIG. It is a part.

  As shown in FIG. 2, the cylindrical portion 41 is provided on a surface on the positive side of the back surface portion 39 in the z-axis direction, and has a central axis extending in the z-axis direction. The central axis of the cylindrical part 41 and the central axis of the cylindrical part 20 substantially coincide.

  The holding portion 38 plays a role of holding the socket 16 and includes a back surface portion 42 and a pressing portion 46 as shown in FIG. The back surface portion 42 is a rectangular plate-like member extending from the back surface portion 39 of the circular portion 36 toward the negative direction side in the x-axis direction. As shown in FIG. 2, the socket 16 is placed on the back surface portion 42.

  The pressing portion 46 is a plate-like member perpendicular to the x-axis direction and is provided on the back surface portion 42. However, a gap Sp is provided between the end portion on the negative direction side in the z-axis direction of the pressing portion 46 and the surface on the positive direction side in the z-axis direction of the back surface portion 42. Similarly, a gap Sp is also provided between the cylindrical portion 41 and the surface of the back surface portion 42 on the positive direction side in the z-axis direction. Thereby, the space on the negative side in the x-axis direction of the pressing portion 46 and the inside of the cylindrical portion 41 communicate with each other through the gap Sp.

  The bushing 14 can be separated into two as shown in FIG. Specifically, the bushing 14 is divided into a V-shape into a half on the positive direction side in the y-axis direction and a half on the negative direction side in the y-axis direction. As a result, a socket 16 described later can be attached to the bushing 14.

  The socket 16 is made of a single metal plate (for example, phosphor bronze for spring), and is attached to the bushing 14 and insulated from the housing 12 by the bushing 14 as shown in FIGS. As shown in FIG. 2, the socket 16 includes a cylindrical portion 48, a back surface portion 50, and a mounting portion 52. As shown in FIG. 2, the cylindrical portion 48 is connected to the positive direction side of the back surface portion 50 in the x-axis direction, and has a shape in which a part of the ring is notched when viewed in plan from the z-axis direction. have. The radius of the cylindrical portion 48 is smaller than the radius of the cylindrical portion 41 of the bushing 14. Therefore, the cylindrical portion 48 is accommodated in the cylindrical portion 41 as shown in FIG. 1 when the coaxial connector 10 is assembled. Furthermore, the cylindrical part 48 is located at the center of the cylindrical part 20 when viewed in plan from the direction (z-axis direction) in which the central axis of the cylindrical part 20 extends.

  The back surface portion 50 is a plate-like member extending on the negative side in the x-axis direction so as to pass through the gap Sp from the cylindrical portion 41. The attachment portion 52 is provided by being bent perpendicularly to the positive direction side in the z-axis direction at the end portion on the negative direction side in the x-axis direction of the back surface portion 50 and connected to the central conductor 224 of the coaxial cable 220. The More specifically, the attachment portion 52 is configured by two cutting pieces 52a and 52b arranged with a predetermined gap therebetween. Then, the coaxial cable 220 is caulked by the caulking portion 26 from the positive direction side in the z-axis direction to the negative direction side so that the central conductor 224 of the coaxial cable 220 is sandwiched by a predetermined gap between the cutting pieces 52a and 52b. It is pressed against the cutting pieces 52a and 52b. As a result, the cutting pieces 52 a and 52 b are pressed against the insulator 223 of the coaxial cable 220 by the force from the caulking portion 26. Then, the cutting pieces 52 a and 52 b cut (break) a part of the insulator 223 of the coaxial cable 220 and are connected to the center conductor 224.

  The coaxial connector 10 configured as described above is assembled according to the procedure described below. 5 and 6 are exploded perspective views of the coaxial connector 10 being assembled.

  First, as shown in FIG. 5, the socket 16 is attached to the bushing 14. More specifically, the socket 16 is sandwiched by the bushing 14 from both sides in the y-axis direction so that the cylindrical portion 48 is accommodated in the cylindrical portion 41 and the back surface portion 50 is accommodated in the gap Sp.

  Next, as shown in FIG. 6, a bushing 14 is attached to the housing 12. More specifically, the bushing 14 is pushed into the housing 12 from the positive side in the z-axis direction so that the circular portion 36 is accommodated in the cylindrical portion 20 and the holding portion 38 is accommodated between the fixed portions 24. Install.

  Next, as shown in FIG. 6, the coaxial cable 220 is placed on the attachment portion 52. At this time, the coaxial cable 220 is processed so that the outer conductor 222 and the insulator 223 are exposed at the tip. However, the center conductor 224 is not exposed. The coaxial cable 220 is placed on the socket 16 so that the insulator 223 is located on the attachment portion 52, the outer conductor 222 is located between the caulking portions 28, and the insulating coating 221 is located on the contact portion 30.

  When the coaxial cable 220 is placed, the caulking process of the caulking portions 26 and 28 is performed. In the caulking step of the caulking portion 26, the insulator 223 is pressed against the cutting pieces 52a and 52b by bending the caulking portion 26. At this time, a part of the insulator 223 is cut by the cutting pieces 52a and 52b, and the cutting pieces 52a and 52b and the central conductor 224 are connected.

  Further, in the caulking process of the caulking portion 28, the caulking portion 28 is bent to wind the caulking portion 28 around the external conductor 222. At this time, the contact portion 30 comes into pressure contact with the insulating coating 221, and the protrusions 60 a and 60 b pierce the insulating coating 221. Through the above steps, the coaxial connector 10 has a configuration as shown in FIG.

  Next, attachment / detachment of the coaxial connector 10 to / from the receptacle 230 will be described. As shown in FIG. 3, the receptacle 230 includes an outer conductor 232 and a center conductor 234. The outer conductor 232 is a cylindrical electrode. The center conductor 234 is an electrode that protrudes in the negative z-axis direction at the center of the outer conductor 232.

  When the coaxial connector 10 is attached to the receptacle 230, the outer conductor 232 is inserted into the cylindrical portion 20 through the opening O1, as shown in FIGS. 3 (a) and 3 (b). Thereby, the inner peripheral surface of the cylindrical portion 20 and the outer peripheral surface of the outer conductor 232 are in contact with each other, so that the outer conductor 222 of the coaxial cable 220 and the outer conductor 232 of the receptacle 230 are electrically connected via the housing 12. become. At this time, the cylindrical portion 20 is expanded by the outer conductor 232. As a result, the inner peripheral surface of the cylindrical portion 20 comes into pressure contact with the outer peripheral surface of the outer conductor 232, and the coaxial connector 10 is prevented from being easily detached from the receptacle 230.

  Further, at the same time as the outer conductor 232 is inserted into the cylindrical portion 20, the center conductor 234 is inserted into the cylindrical portion 48 of the socket 16 as shown in FIGS. 3 (a) and 3 (b). As a result, the outer peripheral surface of the central conductor 234 and the inner peripheral surface of the cylindrical portion 48 are in contact with each other, so that the central conductor 224 of the coaxial cable 220 and the central conductor 234 of the receptacle 230 are electrically connected via the socket 16. become.

(effect)
According to the coaxial connector 10 configured as described above, the coaxial connector 10 can be firmly fixed to the coaxial cable 220. More specifically, in the coaxial connector 10, projections 60 a and 60 b are provided on the surface where the contact portion 30 that contacts the insulating coating 221 contacts the insulating coating 221. As a result, when the caulking portion 28 is wound around the outer conductor 222, the contact portion 30 comes into pressure contact with the insulating coating 221, and the protrusions 60 a and 60 b pierce the insulating coating 221. As a result, the coaxial connector 10 is firmly fixed to the coaxial cable 220.

  Furthermore, according to the coaxial connector 10, it can suppress that characteristic impedance shift | deviates from predetermined characteristic impedance. More specifically, in the coaxial connector 10, insulating portions are formed at the ends of the protrusions 60a and 60b. Thereby, the distance between the metal portions of the protrusions 60a and 60b and the central conductor 224 in the coaxial connector 10 is larger than the distance between the protrusion and the central conductor in the coaxial connector described in Patent Document 1 by the thickness of the insulating portion. . Therefore, the capacity formed between the protrusions 60a and 60b and the center conductor 224 in the coaxial connector 10 is smaller than the capacity formed between the protrusion and the center conductor in the coaxial connector described in Patent Document 1. As a result, in the coaxial connector described in Patent Document 1, the characteristic impedance is less likely to deviate from the desired characteristic impedance as compared with the coaxial connector described in Patent Document 1.

(Computer simulation)
The inventor of the present application performed a computer simulation described below in order to clarify the effect of the coaxial connector 10. Specifically, the first model in which the insulating part is formed on the entire protrusions 60a and 60b, the second model in which the insulating part is formed in a range of 100 μm from the tip of the protrusions 60a and 60b, and the insulating part A third model was formed which was not formed. The first model and the second model correspond to examples of the present invention, and the third model corresponds to a comparative example. Then, in the first model to the third model, the characteristic impedance of the coaxial connector 10 when the gap between the protrusions 60a and 60b and the central conductor 224 is changed was calculated. FIG. 7 is a graph showing the results of computer simulation. The vertical axis represents impedance, and the horizontal axis represents a gap with the center conductor 224. The other simulation conditions are listed below.

Diameter of center conductor 224: 0.12 mm
Diameter of insulator 224: 0.43 mm
Dielectric constant of insulator 224: 2.3
Diameter of outer conductor 222: 0.5 mm
Height of projections 60a and 60b in the z-axis direction: 0.05mm
Insulation part thickness: 10 μm
Dielectric constant of insulating part: 2.3

  According to FIG. 7, in the third model, the characteristic impedance decreases as the protrusions 60 a and 60 b approach the center conductor 224. On the other hand, in the first model and the second model, even when the protrusions 60a and 60b approach the center conductor 224, the characteristic impedance hardly fluctuates. In particular, in the first model, the characteristic impedance does not fluctuate. Thereby, in the coaxial connector 10, it turns out that the fluctuation | variation of characteristic impedance is suppressed.

  Next, the inventor of the present application calculated the characteristic impedance when the dielectric constant of the insulating portion was changed in the first model. FIG. 8 is a graph showing the results of computer simulation. The vertical axis represents impedance, and the horizontal axis represents the dielectric constant of the insulating portion. The dielectric constant was changed to 2.3, 5, 10, and 20. A material having a dielectric constant of 2.3 corresponds to fluorine, a material having a dielectric constant of 5 corresponds to epoxy, and a material having a dielectric constant of 10 corresponds to alumina.

  As can be seen from FIG. 8, the characteristic impedance decreases as the dielectric constant increases. Therefore, it is preferable that the dielectric constant of the insulating portion is small. For example, in order to keep the characteristic impedance in the range of 45Ω to 50Ω, the dielectric constant of the insulating portion is preferably 6 or less.

(Modification)
Below, the coaxial connector which concerns on a modification is demonstrated, referring drawings. FIG. 9 is an external perspective view of a coaxial connector 10a according to a modification. FIG. 10 is an exploded perspective view of a coaxial connector 10a according to a modification.

  In the coaxial connector 10 a, a caulking portion 30 a is provided instead of the contact portion 30. Since the other structure of the coaxial connector 10a is the same as that of the coaxial connector 10, description is abbreviate | omitted.

  The caulking portion 30a is a U-shaped plate-like member provided on the negative side of the caulking portion 28 in the x-axis direction, as shown in FIG. 10, in a state before the coaxial connector 10a is assembled. The caulking portion 30 a is bent as shown in FIG. 9 and is wound around the insulating coating 221 to hold the insulating coating 221 of the coaxial cable 220. Thereby, the caulking portion 30 a plays a role of fixing the coaxial cable 220 to the housing 12.

  Furthermore, as shown in FIG. 10, a plurality of (two) protrusions 60 projecting toward the insulating coating 221 are provided on the surface where the caulking portion 30 a contacts the insulating coating 221. An insulating part is formed on the surface of the protrusion 60 by applying an insulating material such as resin.

  In the coaxial connector 10 a configured as described above, when the caulking portion 30 is wound around the insulating coating 221, the protrusion 60 is inserted into the insulating coating 221. Accordingly, the coaxial connector 10a is firmly fixed to the coaxial cable 220. Further, in the coaxial connector 10a, as in the coaxial connector 10, since the insulating portion is provided in the protrusion 60, the characteristic impedance is prevented from deviating from the predetermined characteristic impedance.

  As described above, the present invention is useful for a coaxial connector, and is particularly excellent in that it can be firmly fixed to a coaxial cable and the characteristic impedance can be prevented from deviating from a predetermined characteristic impedance.

DESCRIPTION OF SYMBOLS 10,10a Coaxial connector 12 Housing 14 Bushing 16 Socket 20 Cylindrical part 23 Holding part 30 Contact part 26,28,30a Caulking part 60,60a, 60b Protrusion 220 Coaxial cable 221 Insulating film 222 External conductor 223 Insulator 224 Central conductor 230 Receptacle 232 Outer conductor 234 Central conductor

Claims (5)

A first center conductor, an insulator provided around the first center conductor, a first outer conductor provided around the insulator, and a periphery of the first outer conductor A coaxial cable composed of an insulating coating, wherein the insulating coating is removed at a tip to expose the first outer conductor, and the first outer conductor is removed to remove the insulator. Is a coaxial connector attached to the exposed coaxial cable,
A cylindrical portion having a central axis substantially orthogonal to the extending direction in which the coaxial cable extends, and a housing including a holding portion extending from the cylindrical portion along the coaxial cable;
A bushing attached to the housing;
A socket that is located in the center of the cylindrical portion when viewed in plan from the direction in which the central axis extends and is insulated from the housing by the bushing, and is connected to the first central conductor When,
With
The holding part is
A first caulking portion for holding the first outer conductor;
A contact portion that contacts the insulating coating;
Have
The surface where the contact portion comes into contact with the insulating coating is provided with a protrusion having an insulating portion formed at the tip,
Coaxial connector characterized by The contact portion is a second caulking portion that holds the insulating coating;
The coaxial connector according to claim 1. The second caulking portion is a plate-like member wound around the insulating coating;
The coaxial connector according to claim 2. The holding part is
A third caulking portion for holding the bushing;
In addition,
The coaxial connector according to any one of claims 1 to 3, wherein: A cylindrical second outer conductor of the receptacle is inserted into the cylindrical portion,
A second center conductor of a receptacle is connected to the socket;
The coaxial connector according to any one of claims 1 to 4, wherein:

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