JPH04271502A - Directional coupler and its manufacture - Google Patents

Abstract

PURPOSE:To realize the small sized directional coupler of an integral structure which is manufactured at a low cost, in which a problem of the productivity of the directional coupler manufactured through pressing and baking of green sheets is solved. CONSTITUTION:The directional coupler 1 is formed with a center dielectric body 2, and outer dielectric bodies 3, 4 provided to both sides of the said center dielectric body 2, and a ground electrode 4 and a terminal electrode 5 are formed to both sides of the outer circumference. The terminal electrode 5 and the ground electrode 4 are separated by a half throughhole 7 to be insulated.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a directional coupler used in various electric circuits and a method for manufacturing the same, and more particularly to a structure of a triplate type directional coupler having three dielectric layers and a method for manufacturing the same. .

0002

BACKGROUND OF THE INVENTION As the above-mentioned triplate type directional coupler, a sheet material made of a mixture of an inorganic powder such as a ceramic powder and an organic binder, that is, a green sheet, is used as a dielectric material. It is described in No. 44408. This directional coupler was formed so that the ground electrodes and terminal electrodes on the outer surface were each individually connected by four flat end surfaces.

0003

[Problem to be solved by the invention] Therefore, the earth electrode (
There has been a problem in that only methods such as printing or brush painting can be used when forming the ground pattern (earth pattern) and terminal electrodes. Therefore, many production steps were required to form electrodes on this end face.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned productivity problem and to provide a directional coupler which can be produced at low cost, is compact, and has an integral structure.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a center dielectric and outer dielectrics provided on both sides of the center dielectric, each made of inorganic material powder such as ceramic powder. In a directional coupler formed of a sheet material made of a mixture with an organic binder, each dielectric material is laminated and pressed and fired, and has a terminal electrode and a ground electrode on its outer peripheral surface. and a directional coupler separated by a through hole, and in the method for manufacturing the directional coupler, the sheet material is a sheet material having a size equivalent to a plurality of directional couplers. A plurality of strip lines of a predetermined shape are formed on both sides of the sheet material that will serve as the center dielectric, and through holes are formed at predetermined positions corresponding to the outer periphery of the divided directional coupler. A sheet material that has been processed with through holes is laminated on both sides of the center dielectric as an outer dielectric, and after being crimped and fired, it is divided into individual sheets, and the strip is placed in the convex or concave portion of the end surface formed by the through hole. The present invention provides a method for manufacturing a directional coupler, characterized in that a terminal electrode connected to a line is provided, and a ground electrode is provided in a portion separated from the terminal electrode by the through hole.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in more detail below based on embodiments shown in the drawings.

First, in FIGS. 1 to 3, a directional coupler 1 is composed of a center dielectric 2 and outer dielectrics 3, 3 provided on both sides of the center dielectric 2. A ground electrode 4 and a terminal electrode 5 are formed on both sides of the outer peripheral surface. Both dielectrics 2 and 3 are each formed to have a predetermined shape and thickness depending on the performance of the directional coupler 1, and both sides of the center dielectric 2 are provided with a predetermined shape so as to overlap on the front and back. A strip line 6 (see FIG. 3) is formed. The strip line 6 has its end connected to the terminal electrode 5, and the ground electrode 4 is provided on substantially the entire surface of the directional coupler 1 while being insulated from the terminal electrode 5. In the directional coupler 1 shown in this embodiment, the terminal electrode 5 and the ground electrode 4 are separated by a half-through hole 7, and are insulated.

[0008] Such a directional coupler 1 can be manufactured by the method shown in FIGS. 2 and 3. First, using a green sheet 8 that is the size of a plurality of directional couplers, a plurality of predetermined strip lines 6 are formed on both sides of the green sheet 8, which will become the center dielectric 2, in correspondence with each directional coupler 1. At the same time, a through hole 10 is formed at a predetermined position corresponding to the cutting line 9 on the outer periphery of the directional coupler 1. This through hole 10 is provided at a position where a half through hole 7 for insulating and separating the terminal electrode 5 and the ground electrode 4 will be formed when the device is divided into individual directional couplers 1 in a later process.

Next, as outer dielectrics 3 on both sides of the center dielectric 2, green sheets in which through holes corresponding to the through holes 10 of the center dielectric 2 are formed are laminated. After stacking the three green sheets in this manner, the ground electrode 4 and the like are printed and sintered under pressure to integrate each dielectric.

After that, each directional coupler 1 is connected by cutting line 9.
Terminal electrode 5 and ground electrode 4 on the cut surface
is formed in a convex portion separated by a half-through hole 7. At this time, since the portions of the cut surface where the terminal electrodes 5 and the ground electrodes 4 are formed are separated by the half-through hole 7, a dipping method in which the necessary portions of the end surfaces are immersed in the electrode forming paste or roll printing can be used. You will be able to use it.

Furthermore, since the electrodes 4 and 5 are separated by the half-through hole 7, it is possible to reduce the occurrence of defects such as electrode shorts during manufacturing.

Next, FIGS. 4 and 5 show another embodiment of the present invention, in which the directional coupler 1 has a terminal electrode 5 and a ground electrode 4 formed by a half-through hole 7. It is formed within the recess. By forming both the electrodes 4 and 5 within the recess in this manner, the electrodes 4 and 5 are separated by the projection formed by the half-through hole 7. By arranging both electrodes in this way, it is possible to form the terminal electrodes on the end face simultaneously using through-hole printing when printing the outer peripheral surface pattern, and simply press and bake the pattern after forming it and separate it into individual parts. Thus, a directional coupler having a predetermined electrode can be obtained.

[0013]

[Effects of the Invention] As explained above, in the directional coupler of the present invention, since the terminal electrode and the ground electrode are separated by a through hole, electrode formation on the end face can be easily performed, and the quality can be improved at low cost. It is possible to obtain a directional coupler with a high integrated structure.

Furthermore, the method for manufacturing a directional coupler of the present invention uses a green sheet with through holes processed at the positions where it is to be cut and divided into individual parts, and after being crimped and fired, the terminal electrodes are divided into individual parts. Since the electrode and the ground electrode can be separated by a through hole, the end electrode can be easily formed, and the number of production steps and the occurrence of defects can be reduced.

Furthermore, since the directional coupler of the present invention is formed by pressing and firing the green sheet, it is possible to provide a directional coupler of an integrated structure with low cost and high quality.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a directional coupler showing an embodiment of the present invention.

2 is an explanatory diagram of the manufacturing process of the directional coupler shown in FIG. 1. FIG.

FIG. 3 is an enlarged view thereof.

FIG. 4 is a perspective view of a directional coupler showing another embodiment of the present invention.

5 is an explanatory diagram of the manufacturing process of the directional coupler shown in FIG. 4. FIG.

[Explanation of symbols]

1... Directional coupler 2... Center dielectric 3...
Outer dielectric 4... Earth electrode 5... Terminal electrode 6... Strip line 7
…Half through hole 8…G

Claims (2)

[Claims] Claim 1: A center dielectric and outer dielectrics provided on both sides of the center dielectric are each made of a sheet material made of a mixture of an inorganic powder such as a ceramic powder and an organic binder, and each dielectric What is claimed is: 1. A directional coupler which is laminated, pressed and fired, and has a terminal electrode and a ground electrode on its end face, the terminal electrode and the ground electrode being separated by a through hole. 2. A directional coupler in which a center dielectric and outer dielectrics provided on both sides of the center dielectric are each made of a sheet material made of a mixture of an inorganic powder such as a ceramic powder and an organic binder. In the manufacturing method of
As the sheet material, a sheet material having the size of multiple directional couplers is used, and a plurality of strip lines of a predetermined shape are formed on both sides of the sheet material that will become the center dielectric, and the directional properties after division are A through hole is formed at a predetermined position corresponding to the outer periphery of the coupler, and then a sheet material similarly processed with through holes is laminated on both sides of the center dielectric as an outer dielectric, and after being crimped and fired, the sheet material is individually laminated. A direction characterized in that a terminal electrode connected to the strip line is provided in a convex portion or a concave portion of the end face formed by the through hole, and a ground electrode is provided in a portion separated from the terminal electrode by the through hole. A method of manufacturing a sexual coupler.