JP7164385B2 - coaxial connector - Google Patents

Description

The present invention relates to a coaxial connector, and more particularly to an angle-type coaxial connector in which coaxial lines are bent.

2. Description of the Related Art Conventionally, a so-called angle-type coaxial connector, in which a coaxial line is bent to connect coaxial cables at a predetermined angle such as a right angle, has been widely used in communication equipment and the like. As such an angle-type coaxial connector, for example, Patent Document 1 discloses a coaxial connector as shown in FIG. The coaxial connector has a metal shell 1 formed with a tubular passage T having two cylindrical portions and a center conductor 2 arranged along the tubular passage T of the metal shell 1 . The metal shell 1 has a first shell 1A having one cylindrical portion forming a tubular passage T and a second shell 1B having the other cylindrical portion. 1B are connected so that their cylindrical portions are orthogonal to each other. The center conductor 2 includes a straight portion 2A arranged on the central axis of the cylindrical portion of the first shell 1A, a straight portion 2B arranged on the central axis of the cylindrical portion of the second shell 1B, and two It is composed of an angle portion 2C connecting two straight portions 2A and 2B to each other.

JP 2011-204423 A

Generally, the characteristic impedance of a coaxial line in a coaxial connector is determined by the ratio of the outer diameter of the central conductor to the inner diameter of the outer conductor surrounding the central conductor. In order to perform stable signal transmission, it is desirable to maintain a uniform characteristic impedance over the entire length of the coaxial connector. Since the coaxial structure cannot be maintained, the characteristic impedance at this portion also fluctuates greatly, which may make it difficult to carry out stable signal transmission.

SUMMARY OF THE INVENTION An object of the present invention is to provide a coaxial connector capable of stable signal transmission even if it is of the angle type.

A coaxial connector according to the present invention comprises a metal shell having a tubular passage formed therein having two cylindrical portions that intersect and are connected to each other; a center conductor having two straight portions respectively arranged on two central axes of two cylindrical portions and an angle portion connecting the two straight portions so as to intersect each other; a tubular passage attached to a metal shell; and an impedance adjusting member having a protrusion projecting into the tubular passage from the inner wall surface of the central conductor toward the angle portion of the central conductor, wherein the tip of the protrusion of the impedance adjusting member is positioned closer to the angle of the central conductor than the inner wall surface of the tubular passage. It is an angle-type coaxial connector characterized by being close to the part.

The two cylindrical portions are orthogonal to each other, and the angle portion of the center conductor can connect the two straight portions so as to be orthogonal to each other.
The impedance adjusting member can have a flat inclined surface at the tip of the protrusion that intersects both of the two central axes of the two cylindrical portions.
At this time, it is preferable that the protrusion of the impedance adjusting member has a cylindrical shape and the inclined surface is inclined with respect to the central axis of the cylindrical shape.
Also, the impedance adjusting member may have a spring contact disposed near the inclined surface and in communication with the inner wall surface of the tubular passage.
At this time, the spring contact is preferably located at a position less than half the wavelength of the transmission signal from the tip of the protrusion.

One of the two cylindrical portions has a through hole that communicates the outside of the metal shell with the inside of the tubular passage, and the impedance adjusting member may be fitted in the through hole. can.
In this case, the impedance adjusting member preferably has a flange portion that abuts against the edge of the through hole that opens to the outer surface of the metal shell.
Furthermore, it is preferable that the impedance adjusting member has a positioning portion arranged on the flange portion and for determining the rotational position of the impedance adjusting member with respect to the through hole.
At this time, the positioning portion may be a flat portion formed on the flange portion.

Also, the metal shell includes a first shell formed with one of the two cylindrical portions, and a second shell connected to the first shell and formed with the other of the two cylindrical portions. can be done.

According to the present invention, a metal shell having a tubular passage formed therein having two cylindrical portions intersecting and connected to each other; a center conductor having two straight portions respectively arranged on two central axes of the shaped portion and an angle portion connecting the two straight portions so as to intersect each other; an impedance adjusting member having a protrusion projecting into the tubular passage from the wall surface toward the angle portion of the central conductor, wherein the tip of the protrusion of the impedance adjusting member is closer to the angle portion of the central conductor than the inner wall surface of the tubular passage. Because they are close to each other, stable signal transmission can be performed even with the angle type.

1 is a perspective view of a coaxial connector according to Embodiment 1 of the present invention as seen obliquely from above; FIG. 1 is a front view of a coaxial connector according to Embodiment 1; FIG. 1 is an exploded perspective view of a coaxial connector according to Embodiment 1; FIG. FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2; FIG. 4 is a perspective view of the second shell according to Embodiment 1, as viewed obliquely from below; 4 is a plan view of the second shell in Embodiment 1. FIG. 4 is a side view of the second shell in Embodiment 1. FIG. FIG. 8 is a cross-sectional view taken along line BB of FIG. 7; 4 is a perspective view of an impedance adjusting member according to Embodiment 1. FIG. 4 is a side view of the impedance adjusting member according to Embodiment 1. FIG. 4 is a plan view of the impedance adjusting member according to Embodiment 1. FIG. 2 is a cross-sectional view schematically showing a coaxial line; FIG. FIG. 10 is a perspective view of an impedance adjusting member according to Embodiment 2; FIG. 11 is a side view of an impedance adjusting member according to Embodiment 2; FIG. 10 is a vertical cross-sectional view of a coaxial connector according to Embodiment 2; FIG. 11 is a side view of an impedance adjusting member in a modified example of Embodiment 2; FIG. 11 is a side view of an impedance adjusting member in another modification of Embodiment 2; FIG. 10 is a side view of an impedance adjusting member in still another modification of Embodiment 2; 1 is a vertical sectional view showing a conventional coaxial connector; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
Embodiment 1
1 and 2 show a coaxial connector 11 according to Embodiment 1. FIG. As shown in FIGS. 1 and 2, the coaxial connector 11 has a metal shell 12 and a center conductor 13 arranged inside the metal shell 12 . The metal shell 12 is composed of a cylindrical metal first shell 14 extending in a predetermined direction and a metal second shell 15 connected to the end of the first shell 14 and having a substantially rectangular parallelepiped shape. ing. In the second shell 15, a metal impedance adjustment member 16 is attached to a rectangular parallelepiped top portion 15A, and four leg portions 15B project from the rectangular parallelepiped bottom portion. These legs 15B are connected to through holes of a circuit board by soldering or the like when the coaxial connector 11 is mounted on the circuit board (not shown). The coaxial connector 11 is fixed to the circuit board by connecting the four legs 15B to the through holes of the circuit board, and the metal shell 12 is connected to the ground pattern of the circuit board through the four legs 15B and the through holes. electrically connected.

Hereinafter, for the sake of explanation, the direction in which the first shell 14 extends is defined as the Y direction, the direction from the first shell 14 toward the second shell 15 is defined as the +Y direction, and the leg portion 15B of the second shell 15 is perpendicular to the Y direction. The +Z direction is the direction from the top 15A, and the X direction is the direction orthogonal to the Y direction and the Z direction.

As shown in FIG. 3, the coaxial connector 11 further includes a first insulator 17 for holding one end of the central conductor 13 inside the first shell 14 and the other end of the central conductor 13 to the second shell. 15 has a second insulator 18 for holding it inside. The first insulator 17 has a tubular portion 17A into which one end portion of the central conductor 13 is inserted, and a flange portion 17B formed at the +Y direction end portion of the tubular portion 17A. The second insulator 18 has a disk shape with a through hole formed in the center for inserting the other end of the central conductor 13 .

As shown in FIG. 4, inside the first shell 14, a cylindrical first hole H1 having a central axis along the Y direction is formed, and the -Y direction end of the first shell 14 is formed. Circular openings FA1 and FA2 communicating with the first hole H1 are formed in the portion and the +Y direction end, respectively. Further, inside the first hole portion H1, a projecting portion 14A extending annularly along the XZ plane is formed in the vicinity of the -Y direction end portion of the first shell 14. , a protruding portion 14B extending annularly along the XZ plane is formed in the vicinity of the +Y direction end of the first shell 14 .

Inside the second shell 15, a cylindrical second hole H2 having a center axis along the Z direction is formed. A circular through hole TH is formed in the top portion 15A of the second shell 15, and the impedance adjusting member 16 is fitted in the through hole TH.
Further, a flat abutment surface 15C that abuts against the protruding portion 14B of the first shell 14 is formed at the end of the second shell 15 in the -Y direction.
A second insulator 18 is arranged at the -Z direction end of the second shell 15, and the other end of the central conductor 13 projecting in the -Z direction is formed at the center of the second insulator 18. inserted into the hole.

The central conductor 13 includes a first linear portion LP1 extending along the central axis of the first hole portion H1 and having a −Y direction end portion inserted into the cylindrical portion 17A of the first insulator 17, and a second hole portion H1. A second straight portion LP2 extending along the central axis of the portion H2 and inserted through the second insulator 18, and an angle portion AP connecting the first straight portion LP1 and the second straight portion LP2 so as to be orthogonal to each other. have. Here, the center conductor 13 is processed into a so-called L shape by bending a rod-shaped metal material at the angle portion AP. , the diameter of the angle portion AP is designed to be smaller than the diameter of the first straight portion LP1 and the diameter of the second straight portion LP2.

In addition, a tubular passage TP in which two cylindrical portions are orthogonal to each other is formed inside the metal shell 12 by the first hole H1 of the first shell 14 and the second hole H2 of the second shell 15, The center conductor 13 is arranged in the tubular passage TP while being electrically insulated from the metal shell 12 by the first insulator 17 and the second insulator 18 .

Here, as shown in FIG. 5, the second shell 15 penetrates from the -Y direction end of the second shell 15 to the second hole H2, and the +Y direction end of the first shell 14 is fitted. A fitting hole MH is formed. The fitting hole MH has a cylindrical shape with a central axis extending in the Y direction, and has a circular open end EM surrounded by the abutment surface 15C at the -Y direction end of the second shell 15. . An opening SA communicating with the second hole H2 is formed in the bottom portion 15D of the second shell 15, and an annular opening for positioning the second insulator 18 is formed along the circumference of the opening SA. is formed. The second insulator 18 is arranged so as to be in contact with the stepped portion S.

As shown in FIG. 6, the through hole TH formed in the top portion 15A of the second shell 15 has a circular shape.
Moreover, as shown in FIGS. 5 to 7, the second shell 15 has a substantially rectangular parallelepiped shape.
FIG. 8 is a cross-sectional view of the second shell 15 taken along the XY plane passing through the fitting hole MH formed in the second shell 15. As shown in FIG. As shown in FIG. 8, the cylindrical shape of the fitting hole MH and the cylindrical shape of the second hole H2 are perpendicular to each other.

As shown in FIGS. 9 and 10, the impedance adjusting member 16 has a cylindrical protrusion 16A having a central axis extending in the Z direction, and a +Z direction end of the protrusion 16A is stretched along the XY plane. A protruding flange portion 16B is formed. A first vertical plane P1, an inclined plane P2 and a second vertical plane P3, which are sequentially connected in the +Y direction, are formed at the −Z direction end of the projecting portion 16A. The first vertical plane P1 and the second vertical plane P3 are planes perpendicular to the central axis extending in the Z direction of the cylindrical protrusion 16A and facing the -Z direction, respectively, and the inclined plane P2 is , -Y direction and -Z direction, and are flat surfaces that are inclined with respect to the central axis extending in the Z direction of the cylindrical projection 16A.

Further, as shown in FIG. 11, a notch-shaped positioning portion 16C formed of a plane along the XZ plane is formed at the -Y direction end portion of the flange portion 16B. This positioning portion 16C indicates the direction in which the inclined surface P2 faces, and when the impedance adjusting member 16 is fitted into the through hole TH formed in the top portion 15A of the second shell 15, the rotational position of the impedance adjusting member 16 is determined. It is used as a mark for making decisions.

Here, the coaxial connector 11 accommodates the first insulator 17 and the first straight portion LP1 of the central conductor 13 inside the first shell 14, and accommodates the second straight portion LP1 of the central conductor 13 inside the second shell 15. The +Y direction end portion of the first shell 14 is press-fitted into the fitting hole MH from the circular opening end EM of the second shell 15 in a state in which the portion LP2 is accommodated, and the step portion S of the opening portion SA of the second shell 15 is formed. The second insulator 18 is arranged in the second shell 15 , and the impedance adjusting member 16 is fitted into the through hole TH of the top portion 15 A of the second shell 15 .

At this time, the position of the impedance adjustment member 16 in the Z direction is determined by fitting the impedance adjustment member 16 into the through hole TH until the flange portion 16B of the impedance adjustment member 16 contacts the top portion 15A of the second shell 15. . Further, as shown in FIG. 1, the impedance adjustment member 16 is arranged in the XY plane so that the positioning portion 16C of the impedance adjustment member 16 faces the -Y direction, which is the connection direction of the coaxial connector 11 with a mating connector (not shown). is set. As a result, as shown in FIG. 4, the inclined surface P2 of the impedance adjusting member 16 faces the angle portion AP of the central conductor 13 and is more inclined to the angle portion of the central conductor 13 than the inner wall surface of any part of the tubular passage TP. It will be close to the AP.

Here, FIG. 12 schematically shows a cross section of the coaxial line. The coaxial line is composed of an outer peripheral surface of an inner conductor C1 having an outer diameter D1 and an inner peripheral surface of an outer conductor C2 having an inner diameter D2 disposed coaxially with the inner conductor C1 so as to surround the inner conductor C1. do. It is known that the characteristic impedance Z0 of the coaxial line is represented by the following equation (1), where E is the relative dielectric constant of the space between the inner conductor C1 and the outer conductor C2.
Z0=(138/E ^1/2 )·log ₁₀ (D2/D1) (1)
That is, the characteristic impedance Z0 of the coaxial line is generally determined by the ratio (D2/D1) of the inner diameter D2 of the outer conductor C2 to the outer diameter D1 of the inner conductor C1.

Assuming a case where the coaxial connector 11 shown in FIG. and the inner wall surface of the second shell 15, the distance between the first straight portion LP1 of the center conductor 13 and the inner wall surface of the first hole H1, and the distance between the second straight portion LP2 of the center conductor 13 and the second is longer than the distance from the inner wall surface of the hole H2. As a result, the characteristic impedance Z0 of the coaxial line may fluctuate, making stable signal transmission difficult.

According to the coaxial connector 11 of the present invention, since the metallic impedance adjusting member 16 is provided in the vicinity of the angle portion AP of the central conductor 13, fluctuations in the characteristic impedance Z0 of the coaxial line are reduced, and stable signal transmission is achieved. It can be performed. Also, the impedance adjusting member 16 can be easily attached by simply fitting it into the through hole TH formed in the top portion 15A of the second shell 15. The characteristic impedance Z0 around the angle portion AP can be adjusted by selecting the inclination of the inclined surface P2 formed at the tip of the angle portion AP.

In Embodiment 1, the central axis of the first hole portion H1 of the first shell 14 and the central axis of the second hole portion H2 of the second shell 15 are perpendicular to each other. It does not have to be orthogonal. In this case, the first straight portion LP1 and the second straight portion LP2 of the central conductor 13 are also not orthogonal to each other, and are aligned with the central axis of the first hole H1 of the first shell 14 and the second straight portion LP2. They must intersect at an angle equal to the angle of intersection with the central axis of shell 15 .

Also, the first hole H1 of the first shell 14 and the second hole H2 of the second shell 15 each have a cylindrical shape, but the shape is not particularly limited. However, the cylindrical first hole H1 and the second hole H2 can be easily formed by drilling the first shell 14 and the second shell 15 using, for example, a drill. The shape of the first hole H1 and the shape of the second hole H2 are preferably cylindrical.

Further, in Embodiment 1, the through hole TH is formed so as to penetrate from the top portion 15A of the second shell 15 to the second hole portion H2. The location where the through hole TH is formed is not particularly limited as long as it is close to the angle portion AP of 13 . For example, the through hole TH can be formed so as to penetrate the second hole portion H2 in the Y direction from the surface of the second shell 15 facing the +Y direction.

In addition, in Embodiment 1, the impedance adjusting member 16 is arranged so as to protrude into the tubular passage TP formed inside the metal shell 12 through the through hole TH. It is not limited to this. For example, although not shown, the impedance adjustment member 16 can be attached to the inner wall of the tubular passage TP.

Embodiment 2
13 and 14 show the impedance adjusting member 26 used in the coaxial connector according to the second embodiment. A coaxial connector according to the second embodiment uses an impedance adjusting member 26 in place of the impedance adjusting member 16 in the coaxial connector 11 of the first embodiment, and other constituent members are the same as those of the coaxial connector of the first embodiment. 11.

Similar to impedance adjustment member 16 in the first embodiment, impedance adjustment member 26 is made of metal and has cylindrical projection 26A having a central axis extending in the Z direction. , and a flange portion 26B projecting along the XY plane. A first vertical plane P1, an inclined plane P2 and a second vertical plane P3, which are sequentially connected in the +Y direction, are formed at the -Z direction end of the projecting portion 26A. The first vertical plane P1 has an arc-shaped edge on the -Y direction side, and the second vertical plane P3 has an arc-shaped edge on the +Y direction side. Further, as shown in FIG. 13, at the end of the projecting portion 26A in the -Z direction, a slit SL passing through the central axis of the projecting portion 26A and along the YZ plane extends from the second vertical plane P3 to the inclined plane P2. formed. Furthermore, as shown in FIG. 14, a spring contact 26C is formed at the -Z direction end of the projecting portion 26A and projects along the XY plane from the arcuate edge of the second vertical plane P3. The spring contact 26C can be elastically displaced in the Y direction by elastic deformation of the projecting portion 26A that has a slit SL along the YZ plane and extends in the Z direction.

Impedance adjusting member 26 is fitted into through-hole TH of second shell 15 as shown in FIG. It contacts the inner wall surface of the oriented metal shell 12 . Even if there is a spring contact 26C protruding along the XY plane from the projecting portion 26A, the second vertical plane on which the spring contact 26C is formed is obtained when the impedance adjusting member 26 is tilted in the YZ plane. The impedance adjustment member 26 can be easily fitted into the through hole TH of the second shell 15 by inserting it into the through hole TH from P3. Also, the spring contact 26C of the impedance adjusting member 26 is pressed against the inner wall surface of the second shell 15 by the elastic force of the protruding portion 26A, so that the spring contact 26C comes into contact with the inner wall surface of the second shell 15 reliably.

When the coaxial connector of the first embodiment is mounted on a circuit board (not shown), the legs 15B of the second shell 15 are connected to the ground pattern of the circuit board. A feedback current flows through the inner wall surface of the metal shell 12, but since the feedback current must flow around the surface of the impedance adjusting member 16 protruding into the second shell 15, there is no interaction with the signal current. A so-called stub, which is a large difference in transmission distance, occurs. On the other hand, in the coaxial connector of the second embodiment, the feedback current flows to the inner wall surface of the second shell 15 without going around the impedance adjusting member 26 due to the spring contact 26C. The difference in transmission distance becomes smaller. Therefore, for example, even when a signal having a very high frequency is transmitted through the central conductor 13, the impedance adjusting member 26 projecting inside the second shell 15 prevents the generation of a so-called stub. Therefore, stable signal transmission can be performed.
Furthermore, in order to prevent the resonance phenomenon of the feedback current, it is desirable to provide the spring contact 26C at a position less than half the wavelength of the transmission signal from the tip of the impedance adjusting member 26. FIG.

Further, in the second embodiment, as shown in FIGS. 13 and 14, a first vertical plane P1, an inclined plane P2, and a second vertical plane are formed on the −Z direction end of the projecting portion 26A of the impedance adjusting member 26. P3 is formed, but when the impedance adjusting member 26 is fitted into the through hole TH of the second shell 15, the -Z direction end of the protruding portion 26A and the angle portion AP of the central conductor 13 do not come close to each other. For example, the shape of the -Z direction end of the projecting portion 26A is not limited to the shapes shown in FIGS.

For example, as shown in FIG. 16, only one inclined surface P4 and one vertical surface P5 are connected in the +Y direction to the −Z direction end of the projecting portion 27A of the impedance adjustment member 27. A spring contact 27C may be formed to protrude along the XY plane from the arcuate edge. Inclined surface P4 is a flat surface inclined toward the -Y direction and the -Z direction, like inclined surface P2 of impedance adjustment member 16 in the first embodiment and inclined surface P2 of impedance adjustment member 26 in the second embodiment. It is an aspect. A vertical plane P5 is a flat plane perpendicular to the center axis of the projecting portion 27A extending along the Z direction.

Further, for example, as shown in FIG. 17, a first vertical plane P6, a second vertical plane P7, a third vertical plane P7, and a third vertical plane P6 are formed at the -Z direction end of the projecting portion 28A of the impedance adjusting member 28 toward the +Y direction. The vertical planes P8 may be formed stepwise in sequence, and spring contacts 28C projecting along the XY plane from arc-shaped edges of the third vertical plane P8 may be formed. The first vertical plane P6, the second vertical plane P7, and the third vertical plane P8 are all flat planes perpendicular to the central axis of the projecting portion 28A.

Further, for example, as shown in FIG. 18, one curved surface P9 and one vertical surface P10 are connected in the +Y direction to the −Z direction end of the projecting portion 29A of the impedance adjustment member 29, and the vertical surface P10 A spring contact 29C may be formed that protrudes along the XY plane from the arcuate edge of the . The curved surface P9 has a curved shape that is concave in the -Y direction and the -Z direction. Also, the vertical plane P10 is a flat plane perpendicular to the central axis of the projecting portion 29A.

16 to 18 are used instead of the impedance adjusting member 16 of the coaxial connector 11 according to the first embodiment by omitting the spring contacts 27C to 29C from the impedance adjusting members 27 to 29, respectively. can also

1 metal shell 1A first shell 1B second shell 2 central conductor 2A, 2B straight portion 2C angle portion T tubular passage;
11 coaxial connector 12 metal shell 13 center conductor 14 first shell 14A inner annular protrusion 14B outer annular protrusion 15 second shell 15A top 15B leg 15C facing surface 15D bottom 16, 26, 27, 28, 29 impedance adjustment member 16B, 17B flange portion 16A, 26A, 27A, 28A, 29A projection portion 16C positioning portion 17 first insulator 17A projection portion 18 second insulator AP angle portion , C1 inner conductor, C2 outer conductor, D1 outer diameter, D2 inner diameter, EM opening end, FA1, FA2, SA opening, H1 first hole, H2 second hole, LP1 first straight portion, LP2 Second straight portion, MH Fitting hole, P1, P6 First vertical surface, P2, P4 Inclined surface, P3, P7 Second vertical surface, P5, P10 Vertical surface, P8 Third vertical surface, P9 Curved face, S shoulder, SL slit, TH through-hole, TP tubular passage.

Claims (11)

a metal shell in which is formed a tubular passage having two cylindrical sections that intersect and are connected to each other;
two straight portions arranged along the tubular passage of the metal shell and arranged on two central axes of the two cylindrical portions; and the two straight portions intersecting each other. a central conductor having an angle portion that connects to
a metal impedance adjustment member attached to the metal shell and having a projection projecting into the tubular passage from the inner wall surface of the tubular passage toward the angle portion of the central conductor;
the tip of the projecting portion of the impedance adjusting member is closer to the angle portion of the central conductor than the inner wall surface of the tubular passage;
An angle-type coaxial connector , wherein the impedance adjusting member has a spring contact disposed near the tip of the projecting portion and electrically connected to the inner wall surface of the tubular passage . The two cylindrical portions are orthogonal to each other,
2. The coaxial connector according to claim 1, wherein the angle portion of the center conductor connects the two straight portions so as to be perpendicular to each other. 3. The coaxial connector according to claim 1, wherein the impedance adjusting member has a flat inclined surface at the tip of the projecting portion that intersects both of the two central axes of the two cylindrical portions. 4. The coaxial connector according to claim 3, wherein the projecting portion of the impedance adjusting member has a cylindrical shape, and the inclined surface is inclined with respect to the central axis of the cylindrical shape. 5. A coaxial connector according to claim 3 or 4 , wherein said spring contact is located near said inclined surface. 6. The coaxial connector of claim 5, wherein the spring contact is located less than one-half wavelength of the transmitted signal from the tip of the protrusion. having a through hole disposed in one of the two cylindrical portions and communicating between the outside of the metal shell and the inside of the tubular passage;
7. The coaxial connector according to claim 1, wherein said impedance adjusting member is fitted in said through hole. 8. The coaxial connector according to claim 7, wherein said impedance adjusting member has a flange portion that abuts against an edge of said through hole that opens to the outer surface of said metal shell. 9. The coaxial connector according to claim 8, wherein the impedance adjusting member has a positioning portion arranged on the flange portion for determining a rotational position of the impedance adjusting member with respect to the through hole. 10. The coaxial connector according to claim 9, wherein said positioning portion comprises a planar portion formed on said flange portion. The metal shell comprises a first shell formed with one of the two cylindrical portions, and a second shell connected to the first shell and formed with the other of the two cylindrical portions. A coaxial connector as claimed in any one of claims 1 to 10 comprising.

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