Electrical connectors – Including or for use with coaxial cable
Reexamination Certificate
2003-07-07
2004-12-28
Zarroli, Michael C. (Department: 2839)
Electrical connectors
Including or for use with coaxial cable
C174S08800C
Reexamination Certificate
active
06835096
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention provides a connecting structure of a coaxial cable and a coaxial connector.
2. Description of the Related Art
A conventional connecting structure of a coaxial cable and a coaxial connector electrically and mechanically connects a coaxial cable and a coaxial connector. A braided conductor is exposed at an end of the coaxial cable. Connecting conductor portions formed continuously from an end of a shell (for example, a grounded shell) of the coaxial connector are inserted into a space between the braided conductor and a metal tape conductor (or a dielectric material) inside the braided conductor. Then, a cylindrical sleeve is caulked.
Conventional examples of the outside contours of the cross section of the caulked sleeve
4
are shown in
FIGS. 12-14
.
FIG. 12
shows an outside contour
101
of the cross section of the caulked sleeve
4
formed into an almost hexagonal shape (type 1);
FIG. 13
shows an outside contour
102
of the cross section of the caulked sleeve
4
formed into an almost elliptical shape (type 2); and
FIG. 14
shows an outside contour
103
of the cross section of the caulked sleeve
4
which is shaped like a letter O (type 3).
However, it is difficult to have sufficient tensile strength and high-frequency performance at the same time using the conventional examples of a caulked sleeve
4
as shown in
FIGS. 12-14
.
For example, when the outside contour of the cross section of the caulked sleeve
4
is shaped as shown in
FIG. 12
,
13
, or
14
, the VSWR (Voltage Standing Wave Ratio) deteriorates when the tensile strength is a certain value. In the conventional examples of
FIGS. 12-14
, this problem occurs since the contours of the cross sections of the dielectric material and the external conductor, which surround the central conductor of the coaxial cable, deform from their original concentric circular shapes. This deformation occurs at a higher degree as the tensile strength increases.
SUMMARY OF THE INVENTION
In view of the foregoing problems, the present invention provides a connecting structure of a coaxial cable and a coaxial connector, which can have sufficient tensile strength and high-frequency performance at the same time.
Extensive experiments have been conducted repetitively to be able to set tensile strength to a certain value while preventing deterioration of high-frequency performance in a connecting structure of a coaxial cable and a coaxial connector by forming the contour of a cross section of a dielectric material
12
and an exterior conductor, which surround a central conductor
11
of a coaxial cable
1
, into an almost concentric shape. It was discovered that both of the respective desired ranges of tensile strength and high-frequency performance can be achieved when an outside contour
5
of a cross section of the caulked sleeve
4
having a crimp height H
1
is formed into an almost circular shape by jointing two opposing almost semi-circular members
43
. An outside contour of each of the two opposing almost semi-circular members
43
has a radius R
1
so that R
1
and H
1
satisfy Equations (1) and (2), respectively:
R
1
=
P
1
×(
D
+2
×T
1
) and (1)
H
1
=
P
2
×
R
1
(2)
where D is an outside diameter of the coaxial cable
1
, T
1
as a plate thickness of the sleeve
4
, P
1
is a numerical value set within the range from 0.45 to 0.48, and P
2
is a numerical value set within the range from 2.02 to 2.12.
The present invention provides a connecting structure of a coaxial cable and a coaxial connector that electrically and mechanically connects a coaxial cable
1
and a coaxial connector
2
. In an embodiment of the present invention, an exterior conductor of the coaxial cable
1
comprises a braided conductor
14
and a metal tape conductor
13
that is located inside the braided conductor
14
. The braided conductor
14
is exposed at an end of the coaxial cable
1
. Connecting conductor portions
26
formed continuously at an end of a shell
21
of the coaxial connector
2
are inserted into a space between the braided conductor
14
and the metal tape conductor
13
. Then, the cylindrical sleeve
4
is caulked. An outside contour
5
of a cross section of the caulked sleeve
4
is formed into an almost circular shape having a crimp height H
1
by jointing two opposing almost semi-circular members
43
. An outside contour of each of the two opposing almost semi-circular members
43
has a radius R
1
so that R
1
and H
1
satisfy Equations (1) and (2) above, respectively, where D is an outside diameter of the coaxial cable
1
and T
1
is a plate thickness of the sleeve
4
.
According to this embodiment of the present invention, the exterior conductor of the coaxial cable
1
comprises the braided conductor
14
and the metal tape conductor
13
. The outside contour
5
of the cross section of the caulked sleeve
4
is formed into an almost circular shape having the crimp height H
1
by jointing two opposing almost semi-circular members
43
. The outside contour of each of the two opposing almost semi-circular members
43
has the radius R
1
so that R
1
and H
1
satisfy Equations (1) and (2) above, respectively. Therefore, deterioration of high-frequency performance can be prevented without sacrificing tensile strength, and the respective desired ranges of both tensile strength and high-frequency performance can be achieved.
In another embodiment of the present invention, a connecting structure of a coaxial cable and a coaxial connector for electrically and mechanically connecting a coaxial cable
1
and a coaxial connector
2
is provided. The coaxial cable
1
, according to this embodiment of the present invention, comprises an exterior conductor which only comprises a braided conductor
14
. A dielectric material
12
is located inside the braided conductor
14
. The braided conductor
14
is exposed at an end of the coaxial cable
1
, and connecting conductor portions
26
formed continuously at an end of a shell
21
of the coaxial connector
2
are inserted into a space between the braided conductor
14
and the dielectric material
12
. Then, the cylindrical sleeve
4
is caulked. Therefore, an outside contour
5
of a cross section of the caulked sleeve
4
is formed into an almost circular shape having a crimp height H
1
by jointing two opposing almost semi-circular members
43
. An outside contour of each of the two opposing almost semi-circular members
43
has a radius R
1
so that R
1
and H
1
satisfy Equations (1) and (2) above, respectively, where D is an outside diameter of the coaxial cable
1
and T
1
is a plate thickness of the sleeve
4
.
In the connecting structure of the coaxial cable
1
and the coaxial connector
2
according to this embodiment of the present invention in which the exterior conductor of the coaxial cable
1
comprises the braided conductor
14
alone, the outside contour
5
of the cross section of the caulked sleeve
4
is arranged in the same manner as the outside contour
5
of the cross section of the caulked sleeve
4
according to the embodiment of the present invention in which the exterior conductor of the coaxial cable
1
comprises the braided conductor
14
and the metal tape conductor
13
. Therefore, deterioration of high-frequency performance can be prevented without sacrificing tensile strength while being able to achieve the respective desired ranges of both tensile strength and high-frequency performance.
Another embodiment of the present invention provides the connecting structure of a coaxial cable and a coaxial connector according to any of the embodiments described above. Furthermore, an outside contour of a cross section of a joint portion
42
which connects each end of an outside contour of the cross section of the two opposing almost semi-circular members
43
, which each have the radius R
1
, to an outside contour
51
of a cross section of protruding strips
41
on an outer circumference of the caulked sleeve
4
. Thus,
Darby & Darby
SMK Corporation
Zarroli Michael C.
LandOfFree
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