JP2579583B2 - High frequency signal line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an open (leakage) or closed
High-frequency signal line that can be easily used for chain type (transmission)
About .

[0002]

2. Description of the Related Art A high-frequency signal line that is electromagnetically opened leaks transmission signals into the air and receives radio waves from space. Leakage or reception of transmission energy in the line lowers transmission efficiency in the leakage and functions as an antenna in reception, but causes mixing of external noise. Therefore, in general, electromagnetically closed coaxial cables are frequently used as high-efficiency transmission lines for such high-frequency signals.

When a coaxial cable is used to construct a cable television transmission network or an online communication network such as a personal computer, it is necessary to take out a wide variety of branches from these transmission buses to terminals.

Conventionally, in the case of a coaxial cable with an induced electric wire in a wired communication, a coaxial cable is provided by removing a protective jacket of the cable, taking out a center conductor disposed inside the outer conductor, and so on. Were connected to those of the coaxial cable for branching. For this reason, strip processing and post-processing of the cable terminal were very troublesome. Accordingly, the applicant of the present invention has previously proposed a simple branch connection means in a parallel cable in Japanese Patent Application Laid-Open No. 3-64221. According to this means, it is easy to couple the induced line to the parallel cable and induce a high-frequency signal in the induced line. However, this induced line
For open (leakage) or closed (transmission)
It was difficult. In addition, parallel cables and induced lines
Separate construction is required to make the joint of
Was needed .

[0005]

Therefore, the first aspect of the present invention
The purpose of the open (leaks) or dual height closed (transmission)
A second object of the present invention is to provide a simple structure of a branch structure using the frequency signal line .

[0006]

SUMMARY OF THE INVENTION A high-frequency signal line according to the present invention
Inside a long metal case to achieve the above purpose
The center conductor of the coaxial cable is extended and
A part of the case is provided with an opening for the line length, and this opening
A plurality of shielding covers divided in the longitudinal direction of
In addition to being provided so that it can be
At least one of the bars is placed in parallel with the center conductor
An induction line for high-frequency coupling is provided on the
Connect a matching resistor to one end and connect the other end to the branch line connection end.
It is characterized by having done.

[0007] The above Symbol metal case is a groove type of metal case
It is characterized by the following. The above metal case is a cylindrical metal case
Yes, filled with insulating material between the center conductor and the metal case
It is characterized by having.

[0008]

[Action] The metal case , which is partially open along the line length direction with respect to the center conductor arranged in the long metal case,
In this state, it functions as an open type (leakage) high-frequency signal line, and by attaching a shielding cover electrically connected to the metal case to the opening, the closed type (transmission) high- frequency signal line is provided.
It functions as a frequency signal line .

The central conductor has a metal casing containing the central conductor.
High frequency signal from the signal source is transmitted between the over scan.
Then, a high-frequency signal is induced in the induction line which is disposed in parallel with the center conductor in parallel with a predetermined interval by electromagnetic coupling therebetween. The metal case also functions as a shield case having an electromagnetic shielding function for this induced line coupling component.

[0010] The long metal case body has a divided shielding
Since it functions as a multiple installation body on the shield cover side with respect to the cover side , by arranging the above-described induced line coupling component parts on each of the shield cover sides or in the required number, the same signal line can be used. It is possible to obtain a take-out connection of a multi-branch output at the same location of

[0011]

FIG. 5 is an electrical equivalent connection diagram in the case of a branch configuration according to the present invention. In the figure, S is a signal source for transmitting a high frequency signal. Reference numeral 1 denotes a coaxial cable, which is shown as an intermediate transmission system of a high-frequency signal from the signal source S. Reference numeral 2 denotes a central conductor of the coaxial cable 1. This central conductor 2 is extended and arranged in the above-mentioned cylindrical or groove-shaped metal case,
The outer conductor 3 of the coaxial cable 1 is arranged parallel to the center conductor 1. These two conductors 2 and 3 have a terminal resistor ZR at their terminals.
Is connected.

On the other hand, reference numeral 4 denotes an induction line made of a copper wire or the like, which is arranged in parallel along a part of the central conductor 2, one end of which is connected to the external conductor 3 via a matching resistor Zr. The end is connected to the central conductor 6 of the coaxial cable 5 for branching. The outer conductor 7 of the coaxial cable 5 on the signal source S side is connected to the outer conductor 7 of the coaxial cable 5 for branching. In addition, the branch connection portion including the induction line 4 and the matching resistor Zr and the coaxial cable 5 for branching is arranged at the center and the outer conductors 2 and 3 where it is arranged.
Are separated from each other and connected to each other independently. In general, the amount of induction in this inductive coupling can be increased or decreased by the approach distance between the transmission line (center conductor 2 side) and the induction line 4 side and the length of the induction line. Since there is a risk that the approach of the transmission line may cause an uneven impedance on the transmission line side, the above-mentioned increase or decrease is adjusted by making the approach distance constant and varying the length. At this time, the length of the induced line is 2
If it is doubled, the induced amount increases by about 5 dB, and if it is doubled, it decreases by about 5 dB.

FIG. 1 is an exploded perspective view showing an embodiment of the present invention, and FIG.
In side view showing the longitudinal line A-A section of the upper, grooved metal cable
A central conductor of the coaxial cable 1 or an extended conductor thereof is arranged inside the case 15 in an insulated state in the case, and can be connected to the coaxial cable 1 via the connector 9. At the time of this connection, the outer conductor 3 and the case body 15 are also electrically connected.

The shielding cover 16 is provided on the metal case main body 1.
The length of the metal case 5 is divided into a fraction of the total length of the metal case 5 , and a plurality of the lengths are connected to each other so as to cover the entire length of the opening of the metal case main body 15 so as to be detachably mounted. is there. At least one of the shield covers 16 is provided between the connectors 11 and 12 at both inner ends thereof so that the guide line 4 is electrically insulated from the case. Further, if necessary, a position regulating piece 13 made of an insulating plate is provided between the stretches to maintain an insulation interval between the induced line 4 and the case, and at the same time, the shielding cover 16 is attached to the metal case body 15.
The central conductor 2 and the induction line 4 are arranged in a parallel arrangement when they are mounted on an insulator or when an insulator such as foamed polyethylene is disposed on the whole. This connector 11
Is connected to the coaxial cable 5 for branching, and the other connector 12 is connected to a component 14 having a built-in matching resistor Zr.

According to the illustrated embodiment having such a configuration, the induced line 4 connected to the center conductor 6 of the branching cable 5 of the center conductor 2 of the coaxial cable 1 on the signal source S side arranged close to and parallel to each other. And an electromagnetically induced coupling is performed between them, so that an induced signal can be sent to the branch side coaxial cable 5. In addition, the shielding prepared in advance on the metal case body 15
By covering and mounting the cover 16 , the conductor 2 and the line 4 are automatically arranged close to and parallel to each other, so that the inductive coupling between them can be performed, and the metal case main body 1 can be formed.
This portion is covered with the shielding cover 5 and the shielding cover 16 , so that a closed (transmission) branch connection can be easily formed. It should be noted that, in the drawing, metal Quai
The base body 15 on the lower side and the shielding cover 16 on the upper side.
May be reversed. Due to the installation of the shielding cover 16
Open (leakage) or closed (transmission) high-frequency signal line
It can be used very easily as a road.

[Embodiment 2] FIG. 3 is a partially omitted perspective view showing another embodiment.
And the center conductor of the coaxial cable 1 in the cylindrical metal case 8.
2 is extended and arranged, and the insulating material K is
And the center conductor 2. G is the above tubular metal
A part of the cylindrical shape of the case 8 and a part of the insulating material K are oriented in the wire length direction.
This is an open groove formed in the above. In addition, this insulation material
For example, foamed polyethylene may be used. This center conductor
2 is connected to a signal source via a connector
Is disgusted. The outer conductor 3 of the coaxial cable is also connected.
And connect it to this metal case 8
It is . In the figure, an opening of a groove G is formed in a metal case 8.
ing. The shielding cover 10 has several minutes
The shield cover 10 has a length divided into 1
Have connectors 11 and 12 at both ends as connecting parts.
Is provided. In addition, connectors 11 and 12
An induction line 4 is provided, and the periphery of the induction line 4 is formed by a groove.
Surrounded by an insulating material H formed so as to fit into the strip G
is there. Coaxial cable 5 for branching is connected to connector 11
The other connector 12 has the matching resistance Z
The component 14 containing r is connected. This shielding cover 1
0 is attached to the groove G and its opening,
Arrange so as to be parallel to the conductor 2 and make high frequency coupling
It is done .

In addition, the shielding cover may have any of the above
For the purpose of shielding only, eliminating connectors and induced lines
It has a shielding cover . This shielding cover is above
Both types can be detachably and stably attached to the above opening
It is formed as follows . In addition, the metal case has a corner or curved
If there is a part, attach a shielding cover of the corresponding shape.
Just wear it.

Attach the shielding cover to the entire length of the opening.
If the cylindrical metal case is closed (transmission) high-frequency signal line
Can be used as a road. Also, at least this shielding cover
Also provided with connectors 11, 12 and induced line 4
If a shielding cover is used, a closed (transmission) branch connection is possible.
It can be easily configured. In addition, if you remove the shielding cover, it will open
It can be used as a type (leakage) high frequency signal line.

[0019]

As described above, according to the structure of the present invention, first, the line is configured as an open type (leakage) high-frequency signal line.
Runode, can utilize as the antenna cable as it is used in an electromagnetic field, it is possible to function as a high-frequency signal transmission line of the closed type (transmission) by closing <br/> Gilles its structural open portion by a shielding cover . In addition, shielding cover with induced line
So that it can be detachably attached to this high-frequency signal line.
Because it is provided, it is not necessary to directly terminate the coaxial cable at the construction site as in the past, and it is possible to easily obtain a stable branch output without adversely affecting the transmission side, especially In this case, since the inductive coupling portion is performed in a shielded configuration, it is possible to prevent external noise from entering the transmission system well and to prevent external noise leakage. , The whole of the branch
Hand to allow, it is possible to obtain a highly efficient transmission effect.

Further, it is possible to easily add a branch output at any time from any position on the high-frequency signal line without interrupting the transmission of the high-frequency signal .
Accordingly, the configuration of the present invention can be widely used for a wired signal transmission line to realize high-density transmission. In the present invention, the long
Against the metal case constitutes a state of dividing the shielding cover a plurality, since there is provided independently branched connection thereto shielding cover each other, as well as a removable numerous branch output, inter branch output of this such Therefore, the configuration of the present invention is extremely practical because interference such as mutual interference between the two can be eliminated.

[Brief description of the drawings]

FIG. 1 is a partially exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a side view taken along a line AA in FIG.

FIG. 3 is a partially exploded perspective view showing another embodiment of the present invention.

FIG. 4 is a side view across the embodiment shown in FIG. 3;

FIG. 5 is an equivalent circuit illustrating the configuration of the present invention.

[Explanation of symbols]

 1, 5 Coaxial cable 2, 6 Center conductor 3, 7 Outer conductor 4 Induced line 8 Cylindrical metal case 9, 11, and 12 Connector 10 Shielding cover 14 Matching resistor 15 Groove type metal case 16 Shielding cover G Groove H Insulation material K Insulating material

Claims (3)

(57) [Claims] 1. A coaxial cable in a long metal case.
The center conductor is extended and arranged, and
An opening in the direction of the line length of
Attach the multiple shielding covers detachably to the opening
So that at least
High-frequency coupling in parallel with the center conductor
An induced line is provided, and a matching resistor is provided at one end of the induced line.
And connecting the other end to the branch line connection end.
High-frequency signal line to be used . 2. A top Symbol metal case Oh in the groove type of metal case
2. The high-frequency signal line according to claim 1, wherein: 3. The metal case is a cylindrical metal case.
Fill the insulating material between the center conductor and the metal case.
2. The high-frequency signal line according to claim 1, wherein: