JPH0636933A - Planar transformer - Google Patents

Abstract

PURPOSE:To obtain a planar antenna, from which electrodes are easily taken out without performing a special work on magnetic materials. CONSTITUTION:Spiral first coil patterns 11 and 12 are formed on both surfaces of a base material 10 consisting of an insulating material. Magnetic materials 15 and 16 consisting of ferrite are respectively provided on the sides of the respective outer surfaces of the patterns 11 and 12 in such a way that electrodes 13a and 13b and 14a and 14b, which are respectively formed at both ends of both patterns 11 and 12, are exposed. Parts, which are covered with the magnetic materials 15 and 16, of the patterns 11 and 12 are formed into the same form and the parts obtain a strong electromagnetic coupling by overlapping with each other via the base material 10. Parts, which are not covered with the magnetic materials 15 and 16, of the patterns 11 and 12 are respectively formed into different forms, which do not overlap with each other via the material 10, and a capacity component between both coil patterns 11 and 12 is significantly reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plane transformer used as a signal transmission transformer such as a balanced-unbalanced conversion circuit.

[0002]

2. Description of the Related Art As a conventional example of a plane transformer, there is a so-called spiral type transformer as shown in FIG. In this conventional example, as shown in FIG. 5, a conductor layer to be a primary coil 3 and a conductor layer to be a secondary coil 4 are spirally arranged on a lower magnetic layer 2 disposed on a substrate 1. The magnetic layer 5 is formed in a rectangular pattern and the upper magnetic layer 5 is disposed above the magnetic layer 2 and each conductor layer. It is insulated. In addition, the magnetic layer 5 corresponding to the central portion of the spiral pattern
Also, an opening 7 is provided in the center of the insulator layer 6 to take out the electrodes 8a and 8b at one end of the coils 3 and 4, respectively. The electrodes 9a and 9b at the other ends of the coils 3 and 4 are led out from the insulating layer 6.

[0003]

In the above-mentioned conventional example, the electrode 8 is formed by providing the opening 7 at the center of the spiral pattern.
There is a problem that the manufacturing process becomes complicated because the structure is such that a and 8b are taken out. Further, since the planar conductor layers are arranged close to each other, a capacitive component is generated, which causes a problem that characteristics at high frequencies are deteriorated.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a planar antenna in which electrodes can be easily taken out. In addition to the above object, another object of the present invention is to provide a flat transformer in which deterioration of high frequency characteristics due to a capacitive component is suppressed.

[0005]

In order to achieve the above object, the invention of claim 1 provides a first spiral coil pattern made of a conductor layer on one surface of a thin plate-like base material made of an insulating material. And forming a second spiral coil pattern made of a conductor layer on the other side, and forming the first and second coil patterns.
The magnetic material is disposed on the outer surface side of each coil pattern so that both ends of the coil pattern are exposed. Most of the first and second coil patterns covered with the magnetic material overlap with each other through the base material, and most of the first and second coil patterns not covered with the magnetic material overlap with the base material. Both coil patterns are formed so as not to overlap.

According to a second aspect of the present invention, most of the first and second coil patterns covered with the magnetic material are overlapped with each other through the base material, and the first and second coil patterns are not covered with the magnetic material. Both coil patterns are formed so that most of the coil patterns do not overlap with each other via the base material.

[0007]

According to the constitution of the invention described in claim 1, there is no need to perform special processing on the magnetic body to expose the electrode portions formed at the end portions of both coil patterns, which facilitates the production. There is. According to the configuration of the invention described in claim 2, the electromagnetic coupling between the first coil pattern and the second coil pattern is strengthened, and the characteristics of the transformer can be improved.
Further, most of the first and second coil patterns that are not covered with the magnetic material do not overlap with each other through the base material, so that the capacitance component between the first coil pattern and the second coil pattern can be significantly reduced. It has an effect.

[0008]

The present invention will be described below with reference to the drawings. Figure 1
As shown in FIG. 3, in this embodiment, a spiral first coil pattern 11 made of a conductor layer is formed on one surface of a thin plate-shaped substrate 10 made of an insulating material, and a spiral made of a conductor layer is formed on the other surface. The second coil pattern 12 is formed. The base material 10 is made of an insulating film having a thickness of several tens of μm, and the coil patterns 11 and 12 are formed by laminating copper films and etching. In addition, the electrodes 13a and 13 formed on both ends of the coil patterns 11 and 12, respectively.
Coil pattern 1 so that b, 14a and 14b are exposed
A magnetic body 1 made of ferrite on the outer surface side of each of 1 and 12
5, 16 are arranged. Therefore, the electrodes 13a, 13b,
It is not necessary to perform special processing to expose 14a and 14b, and it can be easily taken out.

Further, the first, covered with the magnetic members 15 and 16,
The portions of the second coil patterns 11 and 12 are formed in the same shape, and by overlapping through the base material 10, strong electromagnetic coupling is obtained. Further, the portions of the first and second coil patterns 11 and 12 that are not covered with the magnetic bodies 15 and 16 are formed in a shape that does not overlap with each other with the base material 10 interposed therebetween, and between the first and second coil patterns 11 and 12. It is designed to greatly reduce the capacity component.

The above electrodes 13a, 13b, 14a, 1
Notches may be provided around the magnetic bodies 15 and 16 to expose 4b.

[0011]

According to the invention of claim 1, the first spiral coil pattern made of a conductor layer is formed on one surface of a thin plate-like base material made of an insulating material, and the second spiral coil pattern made of a conductor layer is formed on the other surface. Since the spiral coil pattern is formed and the magnetic material is arranged on the outer surface side of each of the first and second coil patterns so that both ends of the first and second coil patterns are exposed,
There is no need to perform special processing on the magnetic body or the like to expose the electrode portions formed at the end portions of both coil patterns, so that there is an effect that the production is facilitated.

According to a second aspect of the present invention, most of the first and second coil patterns covered with the magnetic material overlap with each other through the base material, and the first and second coil patterns are not covered with the magnetic material. Since both coil patterns are formed so that most of the coil patterns do not overlap with each other through the base material, the first coil pattern and the second coil pattern are formed.
This has the effect of significantly reducing the capacitance component between the coil pattern and the coil pattern.

[Brief description of drawings]

FIG. 1 is a top view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a top view of a conventional example.

FIG. 5 is a sectional view of the same.

[Explanation of symbols]

 10 Base Material 11 First Coil Pattern 12 Second Coil Pattern 13a Electrode 13b Electrode 14a Electrode 14b Electrode 15 Magnetic Material 16 Magnetic Material

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[Procedure amendment]

[Submission date] November 9, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Change

[Correction content]

[0005]

In order to achieve the above object, the invention of claim 1 provides a first spiral coil pattern made of a conductor layer on one surface of a thin plate-like base material made of an insulating material. And forming a second spiral coil pattern made of a conductor layer on the other side, and forming the first and second coil patterns.
Of As both ends of the coil pattern is exposed on the outer surface side of each of the two coil patterns Ru der those disposed magnetic material.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006] The inventions of claim 2, the invention smell of claim 1,
Te, first, a substantial part of the second coil pattern is duplicated through a substrate covered with a magnetic material, a first which is not covered with the magnetic material,
Also, both coil patterns are formed so that most of the second coil patterns do not overlap with each other via the base material.

Claims (2)

[Claims] 1. A first spiral coil pattern made of a conductor layer is formed on one surface of a thin plate-like base material made of an insulating material, and a second spiral coil pattern made of a conductor layer is formed on the other surface. A planar transformer, which is formed by disposing magnetic materials on the outer surface sides of both coil patterns so that both ends of the first and second coil patterns are exposed. 2. Most of the first and second coil patterns covered with a magnetic material overlap with each other via a base material, and most of the first and second coil patterns not covered with a magnetic material are provided. The planar transformer according to claim 1, wherein both coil patterns are formed so as not to overlap with each other with the base material interposed therebetween.