JPH0786814A - Production of parallel strip line cable - Google Patents

Abstract

PURPOSE:To provide the manufacture of a parallel strip line cable capable of reducing the handling time by simplifying work processes by joining superimposed both-side copper-clad plate and one-side copper-clad plate and then turning both copper-plated plates to a shape corresponding to a conductor pattern. CONSTITUTION:The copper film 2a on one side of the both-side copper-clad plate 2 is patterned and the conductor pattern 5 of an optional shape is formed. Then, after superimposing the copper film unformed side of the one-side copper- clad plate 3 on the one side of the both-side copper-clad plate 2 where the conductor attern 5 is formed and joining them, both one-side copper-clad plate 3 and both-side copper-clad plate 2 are cut in the shape corresponding to the conductor pattern 5. Thus, it is required to pattern the copper film 2a on one side of the both-side copper-clad plate 2 at the time of forming the conductor pattern 5 to be the center conductor of this paralel strip line cable 1, however, for the external conductor, the copper film on the other side of the both-side copper-plated plate 2 and the copper film of the one-side copper-clad plate 3 can be utilized as they are and the need of especially forming the external conductor is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a parallel strip line cable used as a high frequency transmission line.

[0002]

2. Description of the Related Art Conventionally, in a miniaturized high frequency device such as a mobile phone, as shown in FIG. 7, a coaxial cable 20 which is a high frequency transmission line for transmitting a high frequency signal is provided to an antenna 21 and a circuit. Assembling is performed on a predetermined portion such as the substrate 22. In this figure, reference numeral 23 is a connector for connecting a coaxial cable, and 24 is an outer case. However, since the coaxial cable 20 whose characteristic impedance is selected as an important element has an unavoidably large outer diameter in terms of its structure, when a coaxial cable 20 of this type is incorporated into a high frequency device, Is the outer case 2
An extra space in 4 is required, which makes it difficult to downsize the entire device.

Therefore, recently, it has been proposed to use the parallel strip line cable 30 as a high-frequency transmission line, which has a thickness of about half that of the coaxial cable 20 when the characteristic impedances are the same. That is, as shown in FIGS. 8 and 9, the parallel stripline cable 30 has an insulator 32 of a predetermined thickness interposed between a pair of wide outer conductors 31 arranged to face each other, and A narrow central conductor 3 inside the object 32
It has a structure in which 3 is embedded.

[0004]

By the way, the outer conductor 31 in the parallel strip line cable 30 of the prior art is used.
When the center conductor 33 is manufactured, it is common to use a thin film forming technique such as sputtering or vapor deposition. Therefore, the manufacturing of these parallel stripline cables 30 requires the same type of working process a plurality of times, resulting in the inconvenience of requiring a great deal of labor.

The present invention was conceived in view of such inconvenience, and an object thereof is to provide a method for manufacturing a parallel stripline cable which can reduce labor by simplifying the working process. There is.

[0006]

In order to achieve such an object, the first method of the present invention is to pattern a copper film on one side of a double-sided copper clad plate to form a conductor pattern of an arbitrary shape, and , After the copper film non-formed surface of the single-sided copper-clad plate is overlaid and bonded on one side of the double-sided copper-clad plate with the conductor pattern formed, both the single-sided copper-clad plate and the double-sided copper-clad plate are compatible with the conductor pattern. The feature is that it is cut in the shape. The second of the method of the present invention is to pattern a copper film on one side of a double-sided copper-clad plate to form a plurality of conductor patterns in parallel, and to form one side of the double-sided copper-clad plate on which these conductor patterns are formed. After the copper film non-forming surface of the single-sided copper-clad plate is overlapped and joined, both the single-sided copper-clad plate and the double-sided copper-clad plate are cut in a shape corresponding to each of the conductor patterns. .

[0007]

According to the method described above, it is necessary to pattern the copper film on one side of the double-sided copper clad plate when forming the conductor pattern to be the central conductor of the parallel stripline cable. The copper film on the other side of the copper-clad plate and the copper film on the one-sided copper-clad plate can be used as they are, and it is not necessary to form these external conductors.

[0008]

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

First Embodiment FIG. 1 is a perspective view showing a schematic structure of a parallel strip line cable according to the first embodiment, FIG. 2 is an exploded perspective view thereof, and FIG.
Are process sectional views showing the manufacturing procedure thereof, and reference numeral 1 in these drawings indicates a parallel stripline cable.

In the parallel stripline cable 1 according to this embodiment, similarly to the conventional example, an insulator 32 having a predetermined thickness is interposed between a pair of wide outer conductors 31 which are arranged so as to face each other, and the insulator 32 is provided. A narrow center conductor 33 inside the
It has a structure in which is embedded. And FIG. 1 and FIG.
In the parallel stripline cable 1, one half of the outer conductor 31 and one half of the insulator 32 are the double-sided copper-clad plate 2 and the other outer conductor 3 as shown in FIG.
1, the center conductor 33 and the other half of the insulator 32 are formed by using the single-sided copper-clad plate 3 respectively, and the double-sided copper-clad plate 2 and the single-sided copper-clad plate 3 are mutually adhesively bonded. Face-to-face bonding is performed via the agent sheet 4.

Next, the manufacturing procedure of the parallel strip line cable 1 will be described with reference to the process sectional view of FIG.

First, a double-sided copper-clad plate 2 and a single-sided copper-clad plate 3 having flexibility in the thickness direction are prepared, and as shown in FIG. By patterning the one-sided copper film 2a, that is, removing unnecessary portions by etching, the conductor pattern 5 to be the center conductor 33 is formed. The shape of the conductor pattern 5 is not limited to the linear shape shown in FIG. 2, and it is needless to say that the shape is arbitrarily set as necessary. After that, as shown in FIG. 3B, after the adhesive sheet 4 is placed and covered on one surface of the double-sided copper clad board 2 on which the conductor pattern 5 is formed, the adhesive sheet 4 is interposed therebetween. Then, the copper film non-formed surface of the single-sided copper clad plate 3, that is, the surface on which the copper film is not formed, is superposed on one surface of the double-sided copper clad plate 2.

After the double-sided copper-clad board 2 and the single-sided copper-clad board 3 which have been superposed are joined by an adhesive sheet 4, both of the copper-clad boards 2 and 3 are formed into a shape corresponding to the conductor pattern 5. Cut along the thickness direction of both. Then, the parallel strip line cable 1 having the cross-sectional structure shown in FIG.
While each of the bases 3 corresponds to the insulator 32, each of the copper film on the other side of the double-sided copper-clad plate 2 and the copper film of the single-sided copper-clad plate 3 corresponds to the outer conductor 31.

That is, in the method of this embodiment, etching is required only when patterning the one-side copper film 2a of the double-sided copper clad plate 2. In the above description, the double-sided copper-clad board 2 and the single-sided copper-clad board 3 are bonded by the adhesive sheet 4, but it is not always necessary to use a sheet-shaped adhesive, and the adhesive itself. It goes without saying that both copper-clad plates 2 and 3 may be joined after applying the above.

Further, after obtaining the parallel strip line cable 1 having the cross-sectional structure shown in FIG. 3 (c), copper is plated on each of the cut surfaces of both copper clad plates 2 and 3 constituting the insulator 32. By connecting the outer conductors 31 with each other, the parallel stripline cable 7 called shield type as shown in the modified example of FIG. 4, that is, the entire circumference of the insulator 32 is covered with the outer conductor 31 in order to prevent leakage of electromagnetic waves. A parallel stripline cable 7 having a structure covered by is obtained. Although not shown, the outer conductor 31 of the parallel stripline cable 7 may be entirely covered with an insulating resin or the like, which can further improve the insulating property. Become.

Second Embodiment Next, a second embodiment of the method of the present invention will be described.

FIG. 5 is a perspective view showing a schematic structure of a parallel stripline cable according to the second embodiment, FIG. 6 is an exploded perspective view showing a manufacturing procedure thereof, and reference numeral 10 in FIG. 5 shows a parallel stripline cable. ing. The parallel stripline cable 10 is different from the parallel stripline cable 1 in the first embodiment only in that the middle part in the length direction is bent along the plane direction, and the other structures are the same. Since there is no difference in the points involved, in FIGS. 5 and 6, parts and portions that are the same as or correspond to those in FIGS. 1 to 3 will be assigned the same reference numerals, and detailed description thereof will be omitted here.

In manufacturing the parallel stripline cable 10 according to this embodiment, first, a double-sided copper-clad plate 2 and a single-sided copper-clad plate 3 having flexibility in the thickness direction are prepared, respectively, and as shown in FIG. Then, by patterning the one-side copper film 2a of the double-sided copper clad plate 2 in an arbitrary shape, the conductor patterns 5 to be the plurality of center conductors 33 are formed in parallel. Needless to say, the shape of these conductor patterns 5 corresponds to the shape required by the parallel stripline cable 10. Then, the adhesive sheet 4 is placed on one surface of the double-sided copper-clad board 2 on which the conductor patterns 5 are formed in parallel, the copper film-non-formed surface of the single-sided copper-clad board 3 is overlapped, and then the copper-clad board 2 is formed. , 3 are superposed on each other with an adhesive sheet 4, and the two copper clad plates 2, 3 are joined together to be integrated.

After that, as shown by the phantom line (two-dot chain line) in FIG.
When the parallel strip line cable 10 having the structure shown in FIG. That is,
When such a procedure is adopted, it is possible to mass-produce a plurality of parallel stripline cables 10 each having a bent portion very easily.

[0020]

As described above, according to the method of the present invention, it is possible to manufacture a parallel stripline cable only by patterning the conductor pattern serving as the central conductor, and it is necessary to use the thin film forming technique a plurality of times. As a result, the work process can be simplified and the labor can be reduced. In addition, it is possible to mass-produce a plurality of parallel stripline cables having an arbitrary shape very easily.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a schematic structure of a parallel stripline cable according to a first embodiment.

FIG. 2 is an exploded perspective view thereof.

FIG. 3 is a process sectional view showing the manufacturing procedure.

FIG. 4 is a sectional view showing a schematic structure of a parallel stripline cable according to a modification.

FIG. 5 is a partially cutaway perspective view showing a schematic structure of a parallel stripline cable according to a second embodiment.

FIG. 6 is an exploded perspective view showing the manufacturing procedure thereof.

FIG. 7 is a cross-sectional view showing a schematic structure of a high-frequency device configured using a coaxial cable according to a conventional example.

FIG. 8 is a partially cutaway perspective view showing a schematic structure of a parallel stripline cable according to a conventional example.

FIG. 9 is a sectional view showing a schematic structure of a parallel stripline cable according to a conventional example.

[Explanation of symbols]

 1 Parallel stripline cable 2 Double-sided copper clad plate 2a Single-sided copper film 3 Single-sided copper clad plate 5 Conductor pattern (center conductor)

Claims (2)

[Claims] 1. A copper film (2a) on one side of a double-sided copper clad plate (2).
To form a conductor pattern (5) of an arbitrary shape, and the copper film of the single-sided copper-clad plate (3) is not formed on one surface of the double-sided copper-clad plate (2) on which the conductor pattern (5) is formed. A parallel stripline cable characterized in that after the formation surfaces are superposed and joined, both the double-sided copper-clad plate (2) and the single-sided copper-clad plate (3) are cut in a shape corresponding to the conductor pattern (5). Production method. 2. A copper film (2a) on one side of a double-sided copper-clad plate (2).
To form a plurality of conductor patterns (5) in parallel, and on one surface of the double-sided copper-clad board (2) on which these conductor patterns (5) are formed, the copper of the single-sided copper-clad board (3) is formed. Double-sided copper-clad board (2)
A method for manufacturing a parallel stripline cable, characterized in that both of the single-sided copper clad plate (3) are cut in a shape corresponding to each of the conductor patterns (5).