JPH05110314A - Directional coupler and its manufacture - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To make it easy to mass-produce directional couplers, to easily adjust and correct their characteristics, and to make them compact. [Structure] The directional coupler includes plate-shaped dielectrics 20, 10,
A ground pattern 21 and a central conductor pattern 22 are provided on the upper and lower surfaces of 30, and the opposing ground patterns 21 on the upper and lower surfaces are connected by through holes 23 penetrating in the vertical direction, and the central conductor pattern 22 and the internal coupling circuit are connected. Are connected by through holes 25 extending in the vertical direction.
Further, in order to improve the characteristics of the directional coupler, a correction through hole 24 for connecting the ground patterns 21 on the upper and lower surfaces facing each other is provided near the coupling circuit. [Effect] Since the ground pattern, the central conductor pattern, and the various through holes are gathered on the upper surface and the lower surface of the dielectric body, it is easy to manufacture a large number of pieces and is suitable for mass production.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a directional coupler and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, as a directional coupler of this type,
For example, there is one disclosed in Japanese Utility Model Laid-Open No. 2-44408, and this conventional directional coupler includes a central dielectric and outer dielectrics provided on both surfaces of the central dielectric. ing. And this conventional directional coupler is formed as follows. That is, the center dielectric and the outer dielectric are each formed of a material made of a mixture of an inorganic material powder such as ceramic powder and an organic binder, and the center dielectric having predetermined strip lines formed on both sides as a coupling circuit is used as the outer dielectric. The body is sandwiched and fired, and a terminal electrode and a ground pattern connected to the strip line are formed on the outer peripheral surface of the body.

In addition, in the conventional directional coupler, in order to remove the resonance mode and improve the characteristics, a hole is formed in the central dielectric near the coupling circuit and is sandwiched by a ground pattern through a metal pin for correction and the ground pattern. Connecting comrades was done.

[0004]

In such a conventional directional coupler, the terminal electrodes are arranged on all six outer peripheral surfaces of the plate-like dielectric formed of the central dielectric and the outer dielectric. Since it is configured as described above, it is not suitable for mass production because a large number of electrodes cannot be manufactured at the same time in electrode formation.

Further, in the conventional method of using the correction pin for improving the characteristics of the directional coupler, there is a limit in thinning the correction pin to be used, and the position where the correction metal pin is inserted is restricted accordingly. As a result, the fine correction cannot be performed, the number of man-hours required for the correction is increased, the size reduction is hindered, and the price of the directional coupler is increased.

An object of the present invention is to provide a directional coupler and a method for manufacturing the same, which can solve the above-mentioned problems of the prior art.

[0007]

According to one aspect of the present invention, there is provided a directional coupler in which a ground pattern and a central conductor pattern are provided on the upper and lower surfaces of a plate-shaped dielectric material, and the opposing ground patterns on the upper and lower surfaces are defined as described above. The central conductor pattern and the internal coupling circuit are connected to each other by a through hole extending in the upper and lower surface directions.

A directional coupler according to another aspect of the invention is
A ground pattern is provided on the upper and lower surfaces of the plate-shaped dielectric, a coupling circuit is provided inside, and a correction through hole that connects the opposing ground patterns on the upper and lower surfaces is provided near the coupling circuit.

The method of manufacturing a directional coupler according to the present invention comprises:
A coupling circuit, a dielectric plate formed by aligning a plurality of pairs of through holes connected to the coupling circuit and a through hole for connecting to the ground pattern in a matrix, a ground pattern, a through hole connected to the ground pattern, A dielectric plate formed by aligning a plurality of pairs of center conductor patterns and through holes connected to the center conductor pattern in a matrix is laminated so that corresponding through holes overlap each other, and the laminated dielectric plate. Is cut along a cutting line that passes substantially through the diameter of the through hole.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in more detail with reference to the accompanying drawings.

FIG. 1 is a schematic perspective view showing an embodiment of the directional coupler according to the present invention. As shown in FIG. 1, the directional coupler of this embodiment is formed by sandwiching a central dielectric 10 between two outer dielectrics 20 and 30. A ground pattern 21 is formed on almost the entire surface of the outer dielectric 20 except for the four corners, and a center conductor pattern 22 is formed at the four corners. Further, the outer dielectric 20 has four through holes 23 connected to the ground pattern 21 at the four positions.
The correction through holes 24 connected to 1 are formed at two locations, and the through holes 25 connected to each central conductor pattern 22 are formed at four locations. The other outer dielectric 30
Although not shown in FIG. 1 on the lower surface of the outer dielectric 20,
A ground pattern 21, a center conductor pattern 22, through holes 23 and 25 formed on the upper surface of the same, and a ground pattern similar to the correction through hole 23, a center conductor pattern, a through hole, and a correction through hole are formed at corresponding positions, respectively. Has been done.

On the other hand, as shown in the enlarged top view of FIG. 2, the central dielectric 10 has a stripline 11A forming a coupling circuit formed on its top surface 10A, and FIG. As shown in the enlarged bottom view, the bottom surface 10B has a stripline 11A on the top surface 10A.
A strip line 11B forming a coupling circuit is formed at a position corresponding to. Furthermore, this central dielectric 10
As shown in FIGS. 2 and 3, through holes 13 are formed at four positions, and these through holes 13 connect the central dielectric 10 to the outer dielectrics 20 and 30.
Is formed at a position aligned with the through holes 23 of the outer dielectrics 20 and 30 when sandwiched by. Further, the central dielectric 10 has four through holes 14 respectively connected to the lead electrodes 12A, 13A, 12B and 13B of the strip lines 11A and 11B.

Moreover, as best shown in FIGS. 2 and 3, the central dielectric 10 extends over an area, such as the reference numeral 15, near the striplines 11A and 11B forming the coupling circuit. , A small diameter, for example, φ0.2 through holes are formed as many as possible. These regions 15 are positioned so as to be aligned with each of the correction through holes 24 when the central dielectric 10 is sandwiched by the outer dielectrics 20 and 30, and among the through holes formed in these regions. , Through hole 24 for correction
The parts aligned with each other form a part of the correction through hole that exhibits the function described below.

Since the directional coupler of this embodiment has the structure as described above, the plate-shaped dielectrics 10, 20 and 3 are used.
A ground pattern 21 and a central conductor pattern 22 are provided on the upper and lower surfaces of 0, and the ground patterns 21 and 21 on the upper and lower surfaces facing each other are connected by through holes 23, 13 and 23 penetrating in the vertical direction. The central conductor pattern 22 and the internal coupling circuits 11A and 11B are connected to each other through through holes 25, 14 and 25 extending in the vertical direction, and the ground patterns 21 and 21 facing each other on the upper and lower surfaces are connected to each other. The correction through holes 24, 15 and 24 are connected in the vicinity.

As described above, in the directional coupler of this embodiment, the ground pattern 21, the through holes 23 connecting the opposing ground patterns 21 and the correction through holes 24, the center conductor pattern 22, and the center conductor pattern 22 are provided. The through holes 25 connecting the coupling circuit 11A and the coupling circuit 11B are all integrated into the dielectric 2.
The plate-shaped dielectric body composed of 0, 10 and 30 is put together on two surfaces of the upper surface and the lower surface.

The formation position of the correction through hole 24 is determined by trial and error finding the optimum position where the resonance mode can be removed to improve the characteristics.

Next, an example of a method of manufacturing the directional coupler of this embodiment will be described with reference to FIG. Figure 4
A plurality of pairs of strip lines 11A and 11B as described with reference to FIGS. 1 to 3, through holes 14 connected to these strip lines, through holes 13 for connecting to the ground pattern, and correction through holes 15 are arranged in a matrix. Ceramic plates formed by aligning,
The ground pattern 21, the through hole 23 connected to the ground pattern 21, the central conductor pattern 22, the through hole 25 connected to the central conductor pattern 22, and the correction through hole 24 connected to the ground pattern 21 as described with reference to FIG. In the form sandwiched by two ceramic plates formed by aligning multiple pairs in a matrix,
FIG. 3 is an enlarged top view showing a state where a large plate-shaped dielectric body is formed by stacking the layers on each other and firing them.

If such a large plate-shaped dielectric is cut along the vertical cutting line 100 and the horizontal cutting line 200 as shown in FIG. 4, a plurality of directional couplers as shown in FIG. 1 are obtained. It is possible to produce a large number of pieces at once.

Next, an embodiment of the method of manufacturing the directional coupler according to the present invention will be described with reference to FIGS. FIG. 5 is an enlarged top view showing a large plate-shaped dielectric body formed by stacking and firing ceramic plates similarly to FIG. Since this manufacturing method is largely the same as that described with reference to FIG. 4, the same parts will not be repeatedly described, and only different parts will be described.

As shown in FIG. 5, the central conductor pattern 22 and the through holes 22 and 14 connected thereto are
In the figure, it is formed so as to straddle two vertically adjacent modules, and the through holes 23 and 13 connected to the ground pattern 21 are formed so as to straddle between two modules that are horizontally adjacent in the figure. ing. If such a large plate-shaped dielectric is cut along the vertical cutting line 101 and the horizontal cutting line 201 as shown in FIG. 5, a plurality of directional couplers as shown in FIG. Can be produced in large quantities.

According to the manufacturing method as shown in FIG. 5, the central conductor pattern 22, the through holes 22 and 14 connected thereto, and the through holes 23 and 13 are shared between the adjacent modules. Therefore, as compared with the manufacturing method as described with reference to FIG. 4, a smaller directional coupler can be obtained.

In the embodiment described above, the coupling circuit is
Although it is formed by sandwiching the central dielectric, the present invention
The present invention is not limited to this, and can be applied to directional couplers including other various types of coupling circuits.

[0023]

According to the structure of the directional coupler of the present invention,
Since the ground pattern, center conductor pattern, and various through holes are put together on the upper and lower surfaces of the dielectric,
It is easy to manufacture multiple pieces and is suitable for mass production. Further, by using a manufacturing method in which the central conductor pattern and various through holes are shared by adjacent modules, a large number of smaller directional couplers can be mounted and the cost can be reduced.

Further, since the characteristic of the directional coupler can be improved by the correction through hole, the degree of freedom in space utilization becomes larger than that when the conventional correction pin is used, and finer characteristic adjustment and correction can be made. It can be performed.

[Brief description of drawings]

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

2 is an enlarged top view of a central dielectric of the directional coupler of FIG. 1. FIG.

3 is an enlarged bottom view of the central dielectric of the directional coupler of FIG. 1. FIG.

FIG. 4 is a plan view for explaining an example of a method of manufacturing the directional coupler of FIG.

FIG. 5 is a plan view for explaining one embodiment of the method for manufacturing a directional coupler according to the present invention.

FIG. 6 is a schematic perspective view showing a directional coupler manufactured by the manufacturing method of FIG.

[Explanation of symbols]

 10 Central Dielectric 11A Stripline 11B Stripline 13 Through Hole 14 Through Hole 20 Outer Dielectric 21 Ground Pattern 22 Center Conductor Pattern 23 Through Hole 24 Correction Through Hole 25 Through Hole 30 Outer Dielectric 100 Vertical Cutting Line 101 Vertical Cutting Line 200 horizontal cutting line 201 horizontal cutting line

Claims (4)

[Claims] 1. A ground pattern and a central conductor pattern are provided on the upper and lower surfaces of a plate-shaped dielectric, and the opposing ground patterns on the upper and lower surfaces are connected by through holes penetrating in the upper and lower surfaces, and the central conductor. A directional coupler, wherein a pattern and an internal coupling circuit are connected by a through hole extending in the vertical direction. 2. The directional coupler according to claim 1, further comprising a through hole for correction for connecting the ground patterns facing each other on the upper and lower surfaces in the vicinity of the coupling circuit. 3. A ground pattern is provided on the upper and lower surfaces of a plate-shaped dielectric material, a coupling circuit is provided inside, and a correction through hole is provided near the coupling circuit to connect the opposing ground patterns on the upper and lower surfaces. Characteristic directional coupler. 4. A dielectric plate formed by arranging a plurality of pairs of a coupling circuit, a through hole connected to the coupling circuit, and a through hole for connecting to the ground pattern in a matrix, a ground pattern, and the ground pattern. A through-hole to be connected, a central conductor pattern, and a dielectric plate formed by aligning a plurality of pairs of through-holes to be connected to the central conductor pattern in a matrix are laminated so that the corresponding through-holes are overlapped, A method for manufacturing a directional coupler, comprising cutting the laminated dielectric plates along a cutting line that substantially passes through the diameter of the through hole.