JP2007081658A - Strip line and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thin strip line excellent in thermal resistance that can be simply manufactured in a short period of time without using a special device. <P>SOLUTION: The strip line is formed by adhesively fixing first/second substrates 1, 2 with each other by using a two-sided adhesive tape 4 so as to sandwich a line 3. The two-sided adhesive tape 4 is composed of an acryl adhesive and release paper. The tape 4 is thin because of no base material and excellent in thermal resistance. By this, it is possible to eliminate the adhesion under a high-temperature/high-pressure environment as a conventional strip-line manufacturing step. Consequently, it is possible to adhere both substrates in a short period of time by applying pressure like pressing with a hand under normal temperature. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a strip line used as a high-frequency transmission line and a manufacturing method thereof.

  The transmission line is a mechanism for propagating electromagnetic waves along the transmission line, and typical examples include a waveguide and a coaxial line. The strip line is one of the transmission lines, and is characterized by being strong against external noise and having good transmission characteristics. In particular, in printed boards (formed by laminating dielectrics, hereafter referred to as substrates), ground planes (generally copper foil is attached to both layers adjacent to the wiring layer) A strip line can be easily formed by providing a conductor). When a substrate having a low dielectric constant and a low dielectric loss tangent is selected from the viewpoint of transmission loss, most of the substrates are molded using a fluororesin (tetrafluoroethylene resin) as a base material.

On the other hand, in the field of tapes and adhesives, transfer tapes using acrylic pressure-sensitive adhesives that exhibit high adhesiveness are provided (see, for example, Non-Patent Document 1). This type of tape is extremely thin because it has no base material, but has excellent heat resistance.
3M Technical Data Sheet “3M” 300LSE Adhesive Transfer Tape 9671LE 9672LE, Sumitomo 3M Limited, Tape and Adhesive Products Division

  When the strip line is formed of a substrate, it is necessary to closely contact the line with a dielectric so as to sandwich the line. In the case of a strip line with a small shape, this structure can be realized by applying a metal plate to both sides and tightening the metal plate from both sides with screws, but this method increases the shape and increases the weight when it becomes large. It causes and is hardly adopted. At present, strip lines are formed by bonding substrates with large shapes. However, the above-mentioned fluororesin is one of the materials that are very difficult to bond, and in conventional stripline manufacturing, special equipment is used to bond using a special adhesive material in a high temperature and high pressure environment. I was going. For this reason, there existed a problem of increase in manufacturing cost and prolongation of a construction period.

  The present invention has been made paying attention to the above circumstances, and the object of the present invention is to provide a strip line that can be manufactured easily and in a short time without using a special device, and is thin and excellent in heat resistance, and a method for manufacturing the strip line. Is to provide.

  In order to achieve the above object, the strip line and the method of manufacturing the same according to the present invention are provided when the first substrate and the second substrate on which the transmission line is formed are bonded and fixed so that the transmission line is sandwiched between them. Then, after uniformly applying a double-sided adhesive tape made of an acrylic adhesive on the adhesive fixing surface of the first or second substrate, the release paper is peeled off, and the second or first adhesive is applied on the remaining adhesive. It is characterized in that the substrate is placed and bonded and fixed.

  In the strip line and the manufacturing method according to the above configuration, it is only necessary to apply a light pressure without requiring a high pressure for bonding the substrates, and since the bonding is completed in a short time, an inexpensive product can be manufactured in a short time. Become. At this time, since the pressure-sensitive adhesive remaining after peeling the release paper from the double-sided adhesive tape becomes a very thin layer, it is possible to reduce the thickness. Moreover, since it is an acrylic adhesive, it also has excellent heat resistance.

  Therefore, according to the present invention, it is possible to provide a strip line that can be manufactured easily and in a short time without using a special device, is thin and has excellent heat resistance, and a method for manufacturing the strip line.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing a basic structure of an embodiment of a strip line according to the present invention. This strip line includes a first substrate 1 and a second substrate 2, and is configured to adhere and fix the first substrate 1 and the second substrate 2 with a double-sided adhesive tape 4. The 1st board | substrate 1 is comprised by the dielectric material base material 12 with which the copper foil ground conductor 11 was provided in the single side | surface. For the dielectric substrate 12, for example, a fluororesin (tetrafluoroethylene resin) is used. The second substrate 2 is constituted by a dielectric base material 22 having a copper foil ground conductor 11 on one side and a line 3 formed of copper foil patterned on the other side.

  FIG. 2 is a diagram showing the configuration of the double-sided adhesive tape 4. The double-sided adhesive tape 4 is composed of an acrylic pressure-sensitive adhesive and release paper. Since there is no base material, it is thin and has excellent heat resistance (compatible with −30 ° C. to 60 ° C.), so it can be used for various applications and adherends. In order not to affect the transmission characteristics of the strip line, the double-sided adhesive tape 4 is preferably very thin, for example, having a thickness of 0.05 mm or 0.13 mm.

Next, the manufacturing method of this strip line is demonstrated. The double-sided adhesive tape 4 is affixed to the entire surface of the dielectric substrate 12 of the first substrate 1 or the surface of the dielectric substrate 22 of the second substrate 2. And after peeling off the release paper of the double-sided adhesive tape 4, the 1st board | substrate 1 and the 2nd board | substrate 2 are adhere | attached. In conventional stripline manufacturing, as shown in FIG. 3, a bonding film corresponding to fluororesin is sandwiched between substrates, and a high temperature / high pressure environment (for example, heating condition: 218 ° C., pressurization) The process of bonding under the condition: 7 kg / cm ² , time: about 4 hours) was necessary. For this reason, the number of special devices that can bond a large substrate of 1 m or more is very limited, causing an increase in manufacturing costs and a long construction period.

  On the other hand, the strip line of this invention can adhere | attach both board | substrates in a short time by applying the pressure of the grade suppressed by hand at normal temperature. Further, there is no increase in weight or expansion of the shape as in the case of tightening with a screw and a metal plate. Furthermore, compared to the case where an adhesive is applied to the substrate, the double-sided adhesive tape can be used to easily bond regardless of the size of the substrate, and the thickness of the entire strip line can be made uniform. it can.

  As described above, in the present invention, the strip line is formed by bonding and fixing the first substrate 1 and the second substrate 2 using the double-sided adhesive tape 4 so as to sandwich the line 3. This double-sided adhesive tape 4 is composed of an acrylic pressure-sensitive adhesive and a release paper, and since it has no base material, it is thin and has excellent heat resistance. This eliminates the need for bonding in a high temperature / high pressure environment, which is a conventional stripline manufacturing process, and allows both substrates to be bonded in a short time by applying a pressure that can be held by hand at room temperature. Can do.

  Therefore, according to the present invention, it is possible to provide a strip line that can be manufactured easily and in a short time without requiring a special device, is thin, and has excellent heat resistance. As a result, it is possible to reduce the cost of the product and shorten the construction period.

  The present invention is not limited to the above embodiment. In the said embodiment, although demonstrated taking the board | substrate of the fluororesin base material as an example, a board | substrate may use an epoxy resin and a phenol resin as a base material not only in this. Further, the present invention can be applied not only to a two-layer structure but also to a multilayer structure.

  In short, the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

The figure which shows the basic structure of one Embodiment of the stripline which concerns on this invention. The figure which shows the structure of the double-sided adhesive tape shown in FIG. The figure which shows an example of the basic structure of the conventional stripline.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... 1st board | substrate, 2 ... 2nd board | substrate, 11, 21 ... Ground conductor, 12, 22 ... Dielectric base material, 3 ... Line | wire, 4 ... Double-sided adhesive tape.

Claims (4)

A first substrate;
A second substrate on which a transmission line is formed;
An adhesive fixing means for bonding and fixing the first substrate and the second substrate so that the transmission line is sandwiched;
The adhesive fixing means uniformly applies a double-sided adhesive tape made of an acrylic pressure-sensitive adhesive on the adhesive fixing surface of the first or second substrate, peels the release paper, and places the first adhesive on the remaining pressure-sensitive adhesive. A strip line comprising two or first substrates mounted and bonded and fixed.   2. The stripline according to claim 1, wherein the first or second substrate is made of a fluororesin as a base material. In the method for manufacturing a strip line, in which the first substrate and the second substrate on which the transmission line is formed are bonded and fixed so that the transmission line is sandwiched,
A step of uniformly applying a double-sided adhesive tape made of an acrylic pressure-sensitive adhesive on the adhesive fixing surface of the first or second substrate;
Peeling the release paper of the double-sided adhesive tape;
And a step of mounting and fixing the second or first substrate on the adhesive remaining on the adhesive fixing surface.   The strip line manufacturing method according to claim 3, wherein the first or second substrate is made of a fluororesin as a base material.

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