JP2000040543A - Cable adapter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cable adapter that can connect a coaxial cable to a printed circuit board in conjunction with a good transmission characteristic and improved mechanical stability as compared with a conventional example. SOLUTION: This cable adapter integrally has a grounding pin 10 and a receiving means 11 to receive a coaxial cable 3. The receiving means 11 is composed as pipe part having a through hole 13 into which the coaxial cable 3 can be inserted. The cable connector is provided with a supporting face 12 to support the cable adapter 1 itself on a printed circuit board 2 leaving a clearance having a predetermined clearance height (a) between the printed circuit board 2 and an end face, facing to it, of the receiving means 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a connection between a printed circuit board and a coaxial cable.

[0002]

BACKGROUND OF THE INVENTION In order to transmit high frequency signals up to several GHz through a coaxial cable, a cable between the coaxial cable and a single-layer or multi-layer (single-sided or double-sided) printed circuit board is used. A connection is required.

As a solution to this problem, a conventional technique shown in FIG. 9 is known. In this technique, an inner conductor 30 of a coaxial cable 3 is inserted into a corresponding hole 20 of a corresponding printed circuit board 2 and soldered. Is attached. For ground connection, the shield 32 of the coaxial cable 3 is peeled off on the printed circuit board 2, twisted into a string, and soldered into the corresponding hole 20 for ground connection of the printed circuit board 2. This is done by: As another conventional structure example, solder is firstly put on a shield of a cable, and then the other end is inserted into a printed circuit board and soldered.

[0004] However, both of the conventional examples have a disadvantage that the coaxial cable is not shielded over a relatively long portion on the printed circuit board, which adversely affects the transmission characteristics.

[0005] Yet another disadvantage is that the soldered coaxial cable is easily bent, thereby impairing its transmission characteristics or being physically damaged.

GB-A-2 187 898 discloses a cable adapter as described in the first part of claim 1 of the present invention. It has cable fasteners that crimp around the outer insulation of the cable and terminals that are fastened around the bundled shield and routed through holes in the printed circuit board. Prior to being soldered to the conductor, the contact is maintained by a detent and stop.

Other devices for terminating coaxial cables to printed circuit boards are disclosed in US Pat. No. 3,743,748 and US Pat.
US-A-3,980,382.

[0008] It is therefore an object of the present invention to provide a connection between a coaxial cable and a printed circuit board having better transmission characteristics and improved mechanical stability compared to the above-mentioned conventional solutions. .

[0009]

According to the present invention, the above object is achieved by the features of claim 1 of the present invention. Furthermore, embodiments of the present invention are subject of the dependent claims of the present invention.

In the cable adapter according to the invention, the unshielded area of the coaxial cable can be reduced to a minimum, which also results in improved transmission and crosstalk characteristics. Also, a repeatable connection with high mechanical stability can be provided for the cable adapter.

Further, advantages and embodiments of the present invention include:
This will be described in more detail with reference to one embodiment description and the drawings.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

[Embodiment 1] In FIGS. 1-4, a cable adapter 1 according to a first embodiment of the present invention provides a connection between a printed circuit board 2 and a coaxial cable 3.
Is shown.

The cable adapter 1 is, in particular, a receiving means 1 for receiving the ground pin 10 and the coaxial cable 3.
1, the receiving means 11 is configured to receive the inner conductor 30 of the coaxial cable at a distance from the ground pin 10, whereby the inner conductor 30 and the ground pin 10 are correspondingly separated from each other. It can be inserted into the two pin holes 20 and 21 of the printed circuit board 2.

The cable adapter 1 also has a support surface 12 that allows the cable adapter 1 to be supported on the printed circuit board 2 and allows the cable adapter 1 to be mounted perpendicular to the printed circuit board 2. Have. The support surface 12 is advantageously in the peripheral area of the ground pin 10. In the illustrated example, the ground pins 10 protrude from substantially the center of the support surface 12 and extend vertically.

The receiving means 11 for receiving the coaxial cable 3 is formed as a cylindrical portion having a through hole 13 into which the coaxial cable 3 can be inserted. The through hole 13 of this example is the first
And a second region 13b having a second diameter smaller than the first diameter. However, in the present invention, the through holes may have the same diameter over the entire length. In such a case, it is preferable to use it for connection of a small-diameter coaxial cable.

As is known, the coaxial cable 3 includes, in order from the inside to the outside, an internal conductor 30, a dielectric 31, and a shield 3.
2 and coating 33. In the two first and second regions 13a and 13b of the through hole 13, the first diameter of the first region 13a is slightly larger than the diameter of the shield 32, and the second diameter of the second region 13b is Dielectric 3
The dimensions are set to be slightly larger than the diameter of the first.

For connection between the coaxial cable 3 and the cable adapter 1 and the printed circuit board 2, the coaxial cable 3 is prepared so as to form an inner conductor 30 whose one end is stripped as shown in FIG. You. The length of the stripped inner conductor 30 is slightly longer than the thickness of the printed circuit board 2. When the cable adapter 1 is assembled,
As a layer following the area where the inner conductor 30 is covered by the dielectric 31, the dielectric 31 extends from the beginning of the second area 13 b onto the surface of the printed circuit board 2. In the first region 13a of the through hole 13, a shield 32 is further provided. Furthermore, outside the cable adapter 1, the coaxial cable 3 has a coating 33.

In order to fix the coaxial cable 3 in the cable adapter 1, the receiving means 11 has a lateral hole 14 opened in the first area 13 a of the through hole 13. Side hole 1
Reference numeral 4 denotes an opening in a region where the shield 32 of the coaxial cable 3 is covered. The horizontal hole 14 allows the coaxial cable 3
Can be soldered to the cable adapter 1. Since the cable adapter 1 is made of a conductive material, the shield 3
2 and the ground pin 10 are electrically connected.

The cable adapter 1 is advantageously manufactured in one piece from a conductive material, and has a lateral extension 15 between the receiving means 11 and the ground pin 10. On one end side, the ground pin 10 extends in one direction perpendicular to the laterally extending portion 15, and on the other end side, the receiving means extends perpendicularly to the laterally extending portion 15 in the opposite direction.

The support surface 12 provided in the peripheral area of the ground pin 10 allows the cable adapter 1 to provide a predetermined gap height a between the printed circuit board 2 and the end face of the receiving means 11 opposed thereto. The printed circuit board 2 is supported on the printed circuit board 2 while leaving a gap. The end face of the receiving means 11 is preferably parallel to the printed circuit board 2.
This gap reliably prevents a short circuit between the internal conductor 30 and the ground due to soldering. The inductance of the unshielded portion in the gap of the coaxial cable 3 can be changed by changing the gap height a.

The cable adapter 1 is a printed circuit board 2
Advantageously, the size of the support surface 12 when supported thereon is at least 25%, preferably 30%, of the total base area of the cable adapter, as is evident from FIG. Thus, the cable adapter 1 is slightly pressed,
It may be disposed vertically above the support surface 12 and may be soldered in place.

As a result, the gap height a is reliably maintained in accordance with the geometrical shape of the cable adapter 1, and the gap height a is repeatedly reproduced throughout the soldering. Gap height a
By setting as appropriate, the connection impedance is
As a specific example, it can be adjusted to, for example, 50Ω.

Cable adapter 1 shown in FIGS.
Are manufactured as turned and / or machined parts.

[Embodiment 2] FIGS. 6 and 7 show a cable adapter according to Embodiment 2 of the present invention.
It is manufactured as a sheet material part obtained by bending a flat sheet metal material (see FIG. 5). To facilitate understanding, the same reference numerals are used for parts equivalent to those in the first embodiment.

This cable adapter uses the ground pin 10
And receiving means 11 for receiving the coaxial cable. The receiving means 11 is configured to receive the inner conductor 30 of the coaxial cable 3 at a distance from the ground pin 10. Thus, at the time of assembly, the internal conductor 30 and the ground pin 10 can be inserted into the two pin holes 20 and 21 of the printed circuit board 2 correspondingly separated.

In this structure, the through-hole 13 does not have a step inside because it is a bent plate material part. However, a lateral opening corresponding to the lateral hole 14 of the embodiment is provided, through which the coaxial cable inserted into the receiving means 11 can be soldered to the receiving means 11.

The cable adapter shown in FIGS.
It should be considered only an example. In particular, in the case where it is manufactured as a plate material part obtained by bending, many variations are conceivable.

An important point, however, is the structure of the support surface 12 as in the first embodiment, and this structure allows the cable adapter to be arranged in a predetermined vertical direction on the printed circuit board. To In the illustrated example, the support surface 12
Is constituted by two clip-like portions bent in opposite directions (see FIG. 7). In this example, the gap height a
A gap having the form is formed between the printed circuit board and the lower end of the receiving means 11.

The cable adapter according to the invention can also be manufactured by transfer casting or sintering.

Third Embodiment FIG. 8 shows a third embodiment of the present invention.
Discloses a cable adapter. Note that components equivalent to those in the first and second embodiments are denoted by the same reference numerals.

Embodiment 3 differs from Embodiment 1 described with reference to FIG. 1 in that the receiving means 11 is not oriented in the vertical direction, but is arranged at an angle α to the vertical direction. Is different. However, the end face of the receiving means 11 facing the printed circuit board 2 is the
Are parallel as well.

The cable adapter according to the present invention has substantially better transmission characteristics and crosstalk characteristics than the conventional example shown in FIG. Transmission measurement (S21 paramete
In r), in the range of 2 GHz to 4 GHz,
An improvement of -3 dB was achieved.

In addition, the cable adapter according to the present invention exhibits substantially high stability of the cable-to-printed circuit board connection, thereby preventing bending or breakage of the cable. Further, the receiving means 11 for the coaxial cable includes a dielectric 31.
Functions as a shield in the exposed area,
Only slightly in the region of the gap between the receiving means 11 and the printed circuit board 2 will there be no shielding. Due to the substantially improved shielding, the inductance of the connection is lower than in the prior art shown in FIG.

When the coaxial cable 3 is assembled on the printed circuit board 2, the coaxial cable 3 is soldered to the cable adapter 1 through the opening 14. Then, the ground pin 10 and the internal conductor are inserted into the corresponding pin holes 20 and 21 of the printed circuit board 2, respectively. By lightly pressing the upper part of the support surface 12 of the cable adapter 1, the cable adapter 1 takes a desired posture and can be soldered.

[0036]

The cable adapter according to the invention makes it possible to make a connection between a coaxial cable and a printed circuit board with better transmission characteristics and improved mechanical stability than in the prior art.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state in which a cable adapter according to a first embodiment of the present invention is assembled on a printed circuit board.

FIG. 2 is a side view of the cable adapter according to the first embodiment of the present invention.

FIG. 3 is a sectional view taken along the section line IV-IV in FIG. 2;

FIG. 4 is a bottom view of the cable adapter shown in FIG. 2;

FIG. 5 is a top view showing a sheet metal material for a cable adapter according to Embodiment 2 of the present invention.

FIG. 6 is a front view of a cable adapter according to Embodiment 2 of the present invention.

FIG. 7 is a bottom view of the cable adapter shown in FIG. 6;

FIG. 8 is a sectional view showing a state where a cable adapter according to a third embodiment of the present invention is assembled on a printed circuit board.

FIG. 9 is a cross-sectional view showing a connection between a coaxial cable and a printed circuit board according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cable adapter 2 Printed circuit board 3 Coaxial cable 10 Ground pin 11 Receiving means 12 Support surface 13 Through hole 13a First area 13b Second area 14 Lateral hole (opening) 15 Laterally extending part 20, 21 Pin hole 30 Inside Conductor 31 Dielectric 32 Shield 33 Coating

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Jens Dunks, Germany, Falkenstrasse, 81941 Munich, 34 (72) Inventor Klaus Helmreich, Germany, 90518 Altdorf by Nürnberg, Beim Steinbruch 18

Claims (13)

[Claims] A ground pin (10) for connecting a printed circuit board (2) and a coaxial cable (3);
The receiving means (1) for receiving the coaxial cable (3)
1) wherein the receiving means is configured to receive the inner conductor (30) of the coaxial cable at a distance from the ground pin, so that, when assembled, the inner conductor (30) is formed. 30) and a cable adapter which allows the ground pin (10) to be inserted into two pin holes (20, 21) of the printed circuit board (2) spaced correspondingly, wherein the coaxial cable (3) The receiving means (11) for receiving the printed circuit board is configured as a cylindrical portion having a through hole (13) into which the coaxial cable (3) can be inserted, and further faces the printed circuit board (2). A support for supporting the cable adapter on the printed circuit board (2) while leaving a gap having a predetermined gap height (a) between the end face of the receiving means (11). Cable adapter, characterized in that it comprises a (12). 2. The cable adapter according to claim 1, wherein the support surface allows the cable adapter to be mounted vertically on the printed circuit board. 3. The cable adapter according to claim 1, wherein the ground pin protrudes vertically from the support surface. 4. The through-hole (13) of the cylindrical portion is provided with a first
2. The device according to claim 1, further comprising a first region having a first diameter and a second region having a second diameter smaller than the first diameter. 3. Cable adapter. 5. The cable adapter according to claim 1, wherein the tubular portion has a lateral hole (14) for soldering a coaxial cable (3) inserted in the tubular portion. . 6. The cable adapter according to claim 1, wherein the cable adapter is manufactured integrally from a conductive material. 7. The cable adapter according to claim 1, wherein the cable adapter is manufactured as a machined and / or machined part. 8. The cable adapter according to claim 1, wherein the cable adapter is manufactured as a bent plate member. 9. The support surface according to claim 1, wherein said support surface is effective at least 25%, preferably at least 3% of the total footprint of the cable adapter.
The cable adapter according to claim 1, wherein the cable adapter is 0%. 10. The through-hole (13) of the cylindrical portion has a first area (13a) having a first diameter and a second area having a second diameter smaller than the first diameter. (13b), wherein the coaxial cable comprises a sheath (33), a shield (32), a dielectric (31), and an inner conductor (3).
0), the first diameter of the first region (13a) is slightly larger than the diameter of the shield (32), and the second diameter of the second region (13b) is The cable adapter according to claim 1, characterized in that the diameter is slightly larger than the diameter of the dielectric (31). 11. The through-hole (13) includes a first region (13a) having a first diameter and a second region (13b) having a second diameter smaller than the first diameter. 2. The cylindrical part according to claim 1, wherein the cylindrical portion further includes a horizontal hole (14) opened in the first region (13 a) of the through hole (13). 3. Cable adapter. 12. A laterally extending part (15) having said ground pin 10 at one end and receiving means 11 at the other end.
With respect to the lateral extension (15), the ground pin (10) extends vertically and in one direction, while the receiving means 11 extends vertically and in the opposite direction. The cable adapter according to claim 1, wherein: 13. The printed circuit board according to claim 1, wherein the end surface of the cylindrical portion is parallel to the printed circuit board.
Cable adapter as described in.