JP3274695B2 - Flat type transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat transformer used for a balun, a distribution circuit, a branch circuit, and the like mainly in a high frequency region such as a TV broadcast frequency.

[0002]

2. Description of the Related Art Conventionally, various transformers such as a transmission line type transformer, a balun, a distribution transformer, and a branch transformer have been used in a high frequency region such as a TV broadcast frequency.

As shown in FIG. 11, a transmission line type transformer T1 inverts a signal input from an input terminal IN and transmits the inverted signal from an output terminal OUT.
As shown in FIG. 1B, the winding 12 is wound around a cylindrical core 11 called a bead type or a toroidal type.

A balun is a device for connecting an unbalanced line and a balanced line. For example, a balun for connecting a 75 Ω coaxial cable and a 300 Ω balanced type cable is shown in FIG.
As shown in FIG. 3, transformers T21 and T2 having a turn ratio of 1: 1
2 is used so that the impedance ratio between input and output is 1: 4. Such transformers T21, T
As shown in FIG. 14, reference numeral 22 denotes a structure in which a winding 12 is wound around a core 11 called a glasses type having a pair of through holes 13.

As shown in FIG. 15, the distribution circuit divides a signal input from an input terminal IN equally by a distribution transformer T3, and sends outputs equally from two output terminals OUT1 and OUT2. is there. As shown in FIG. 16, the distribution transformer T3 is configured by winding a winding 12 around a core 11 called a bead type similar to a transmission line transformer.

As shown in FIG. 17, for example, the branch circuit uses a branch transformer T4 configured such that the turns ratio of windings n1, n2 and windings n3, n4 is 1: 3, and an input terminal. The signal input from IN is output to the output terminal O
It is configured to transmit from the UT and the branch output terminal BOUT. The branch transformer T4 is configured by winding a winding 12 around a core 11 called a glasses type similar to a balun as shown in FIG.

[0007] Each of the above-mentioned transformers is formed by winding a winding 12 through a core 11 having a through hole, and the core 11 is cylindrical and bulky. Therefore, there is a problem that the overall shape becomes relatively large. Further, there is a problem that it is difficult to mechanize the operation of winding the winding 12 because the winding 12 is inserted into the core 11, and furthermore, the position of the winding 12 with respect to the core 11 is likely to be shifted, and the characteristics are often varied. There's a problem.

To solve such a problem, FIG.
As shown in the figure, three magnetic layers 1 functioning as a core
It is considered that a, 1b, and 1c are laminated, and a coil pattern is formed on each of the conductor layers 2a and 2b laminated on both the front and back surfaces of the central magnetic layer 1c. Both coil patterns are arranged so as to be magnetically coupled, and this coil pattern functions as a winding. In the flat transformer thus formed, the coil pattern is fixed to the magnetic layer 1c and the magnetic layers 1a, 1b, 1c are laminated, so that the coil pattern and the magnetic layers 1a, 1c are stacked.
Since there is no positional deviation from b and 1c, and the position and dimensions of the coil pattern with respect to the magnetic layer 1c can be precisely controlled by a printed wiring technique or the like, there is an advantage that the characteristics are stable. I have.

[0009]

However, in the planar transformer having the above-described structure, the opposing portions of the two coil patterns are provided.
Since a magnetic material exists between the coil patterns, part of the magnetic flux generated around each coil pattern passes through the magnetic material layer 1c between the opposing portions of the coil patterns without interlinking each other. become. The presence of such a magnetic flux causes a problem that the coupling coefficient becomes small and the transmission loss increases. That is, the conventional planar transformer having the configuration shown in FIG. 19 has a problem that transmission loss is large and is not suitable for practical use.

An object of the present invention is to solve the above-mentioned problems. The present invention is small in size, easy to manufacture, has stable characteristics, and has a large coupling coefficient. It is an object of the present invention to provide a planar transformer with less loss.

[0011]

The invention of claim 1 [Summary of], in order to achieve the above object, a first conductive layer forming a coil pattern in one plane, the other in the other one plane of <br/> second conductor layer and the two coils forming a coil pattern
In flat <br/> surface transformer the pattern is arranged to magnetically couple to face, a first magnetic layer formed by magnetic paste laminated on the substrate, the first magnetic body An insulating layer formed of a non-magnetic insulating material laminated on the layer, and a second magnetic layer formed of a magnetic paste laminated on the insulating layer; Tomo conductive layer is embedded in the insulating layer together when stacked on the first magnetic layer, a second conductor layer when laminated on the insulating layer
The second is embedded in the magnetic material layer, between the opposing part of the coil pattern in the first conductive layer and the second conductive layer, characterized in that provided with no magnetic material.

[0012] According to a second aspect of the present invention , a coil is provided in one plane.
A first conductor layer on which a pattern is formed and another one plane
And a second conductor layer having another coil pattern formed therein.
Arranged so that both coil patterns are opposed and magnetically coupled.
In the placed planar transformer, the coil of the first conductive layer is
Plate-shaped first magnetic layer having a magnetic pattern attached on one surface
And the coil pattern of the second conductor layer is adhered on one surface.
Plate-shaped second magnetic layer, the first conductive layer and the second conductive layer.
Made of non-magnetic insulating material interposed between conductor layers
A first conductor layer and a second conductor layer
A magnetic body is installed between the opposing parts of the coil pattern in
It is characterized in that it does not emit light.

[0013] According to a third aspect of the present invention , a coil is provided in one plane.
A first conductor layer on which a pattern is formed and another one plane
And a second conductor layer having another coil pattern formed therein.
Distribution so that both coils pattern is magnetically coupled to face
In the placed planar transformer, the coil of the first conductive layer is
Plate-shaped first magnetic layer having a magnetic pattern attached on one surface
A first conductor layer is formed in the first magnetic layer.
The first conductor layer is buried on one side of the above
An insulating layer formed of a magnetic insulating material;
A second conductive layer laminated on the insulating layer,
A first conductive layer and a second conductive layer.
A magnetic body is installed between the opposing parts of the coil pattern of the conductor layer.
It is characterized in that it does not emit light.

The invention according to claim 4 is the invention according to claims 1 to
In the third invention, the first magnetic layer and the second magnetic layer
Through the through hole formed in at least one of
The terminal of the coil pattern of the electric conductor layer and the second electric conductor layer
It is drawn out so that it can be connected to an external line.

[0015] The invention of claim 5 is the invention of claims 1 to
In the invention of the fourth aspect, the first conductive layer and the second conductive layer
At least a part of the layer except for the opposing part of the coil pattern
The insulating layer is formed of a magnetic material.

[0016] The invention of claim 6 includes a first conductive layer forming a coil pattern in one plane, the other one plane
And a second conductor layer having another coil pattern formed therein.
Distribution so that both coil pattern is magnetically coupled to face
In location the flat surface type transformer, the first conductor layer and
A gap is provided between the opposing portions of the coil pattern of the second conductor layer
No magnetic material is provided.

[0017] The invention of claim 7 is the invention according to claim 6.
The coil pattern of the first conductor layer is
The first magnetic layer in the form of a plate and the coil conductor of the second conductive layer
A plate-like second magnetic layer having a turn attached to one surface thereof,
Coil pattern of first conductor layer and second conductor layer
Via a spacer provided at a different site from the
And the first magnetic layer and the second magnetic layer have an insulating property.
It is formed of a magnetic material having the same.

The invention of claim 8 is the invention according to claim 6.
With a first insulating layer made of an insulating material on one side
To form a first conductive layer on the other surface made of an insulating material.
The first magnetic layer on which the substrates are laminated is insulated on one side
A second conductor layer is laminated via a second insulating layer made of a material.
A second substrate having a second substrate made of an insulating material laminated on the other surface.
A first conductive layer and a second conductive layer
A coil provided at a location different from the location facing the coil pattern
They face each other via a pacer.

According to the ninth aspect of the present invention, there is provided the method of claim 7 or claim
In the invention of Item 8, the spacer is made of a magnetic material .

[0020]

The structure common to the inventions according to the above-mentioned claims and
Then, the first conductor layer and the second conductor layer are disposed between the magnetic layers, and the first conductor layer and the second conductor layer are disposed between the opposing portions of the coil pattern of the first conductor layer and the second conductor layer. provided with a magnetic material to
Not so, as in the conventional structure as a planar transformer, it is possible to precisely form the coil pattern, such as by printed wiring technology, of course it can be reduced variations in characteristics in a high frequency band Accordingly, the magnetic flux passing between the opposing portions of the two coil patterns is reduced, the coupling coefficient is increased, and the transmission loss can be reduced.
In addition, since there is no magnetic material between the opposing portions of the two coil patterns, the core loss inside the magnetic material is small, and thus the transmission loss can be reduced .

According to the first aspect, since magnetic material layer is formed by a magnetic paste, manufacturing is facilitated. Here, the first conductor layer is buried in the insulating layer on the first magnetic layer, and the second conductor layer is laid on the insulating layer in the second magnetic layer. By adopting the structure embedded in the layers, the first and second conductor layers are brought into close contact with the first and second magnetic layers without gaps, respectively, thereby increasing the self-inductance and reducing the number of turns. As a result, it is possible to provide a transformer having a small stray capacitance and suitable for high frequency use, and to reduce the size of the transformer.

According to the configuration of the second aspect , the first and the second
The coil pattern of the second conductor layer of the
Since it is attached to one surface of the first and second magnetic layers,
Lamination work becomes easy. In addition, sheet-like insulation layer
Insulating material can be used, and the thickness of the insulating layer
Control becomes easier and the characteristics can be further stabilized.
Wear.

According to the structure of the third aspect, the first conductor layer
Coil pattern adheres to one surface of the plate-shaped first magnetic layer
So that the first conductor layer is laminated on the first magnetic layer.
Embedded in the insulating layer formed on the
The second conductive layer is sandwiched between the second magnetic layer and the insulating layer.
Therefore, when managing the positional relationship between both conductor layers precisely,
It is advantageous.

According to the structure of the fourth aspect, the coil pattern
Terminal of each coil pattern without using a line that straddles
Can be connected to an external line.

According to the structure of the fifth aspect, the first conductor layer
And secondly, a portion of the conductor layer facing the coil pattern is removed.
At least part of the insulating layer is made of a magnetic material
Therefore, a magnetic material is provided between the first magnetic material layer and the second magnetic material layer.
Magnetic path is formed and the magnetic efficiency increases.
Thus, transmission loss can be further reduced.

According to the configuration of claim 6, the core of both conductor layers is
Gap between the opposing parts of the
The relative permittivity between the coil patterns becomes almost 1, and both coils
When the space between the metal patterns is filled with insulating material
The stray capacitance can be reduced by
The entanglement state can be prevented.

According to the seventh and eighth aspects, both conductor layers are provided.
Spacers except for the area between the opposing parts of the coil pattern
Is formed, so a gap is formed between both conductor layers.
Providing the support material has the effect of reducing stray capacitance.
can get.

According to the ninth aspect of the present invention, since the magnetic spacers are provided in portions of the two conductor layers other than between the opposing portions of the coil pattern, the magnetic flux formed around the coil pattern can be reduced. As a result, the magnetic resistance of the passing magnetic path is reduced, and the transmission loss can be reduced. In addition, since the spacer is also used as a support material for forming a gap between the two conductor layers, the effect of increasing the magnetic efficiency and the effect of reducing the stray capacitance can be obtained with a small number of components .

[0029]

Embodiment 1 As shown in FIG. 1, a first magnetic layer 1a is formed by applying a magnetic paste on the surface of a substrate 4 which is a glass substrate.
Is formed. On the first magnetic layer 1a, a first conductor layer 2a having a coil pattern formed thereon is laminated. An insulating layer 3 made of an insulating material is laminated on the first magnetic layer 1a, and the first conductive layer 2a is formed in the insulating layer 3.
Will be buried. On the insulating layer 3, a second conductor layer 2b on which a coil pattern is formed is laminated. Further, the second magnetic layer 1b is laminated on the insulating layer 3 by applying a magnetic paste, and the second conductor layer 2b is embedded in the second magnetic layer 1b. become. Various shapes such as a ring shape, a spiral shape, and a meandering shape can be considered as a shape of the coil pattern formed on the first conductive layer 2a and the second conductive layer 2b, but a spiral shape is adopted here. And In this case, one end of each coil pattern formed on the first conductor layer 2 a and the second conductor layer 2 b is connected to the first magnetic layer 1 a or the second magnetic layer 1 b and the insulating layer 3. The other end of the coil pan is pulled out from above into the substrate 4, and the other end of the coil pan is formed with a through hole (not shown) in the second magnetic layer 1 b and the insulating layer 3 near the center of the spiral.
Is drawn out using a through-hole plating method or a wire bonding method.

As the magnetic paste, for example, by using a ferrite paste having an insulating property, the first magnetic layer 1a and the first conductor layer 2a, and the second magnetic layer 1b and the second magnetic layer 1b are formed. Even if the conductor layers 2b are in direct contact with each other, no short circuit occurs in the coil pattern. The insulating layer 3 is formed by, for example, applying a polymer coating material such as polyimide or depositing SiO ₂ or the like.

According to the above configuration, the first conductor layer 2a
Is close to the first magnetic layer 1a, and the second conductive layer 2b is close to the second magnetic layer 1b. Therefore, as shown in FIG. And the magnetic flux density of the magnetic flux φ generated around the second conductor layer 2b becomes higher in the first magnetic layer 1a and the second magnetic layer 1b. Further, since the coil pattern and the magnetic material is provided between the opposing portions of the coil pattern of the second conductive layer 2b of the first conductor layer 2a is not interposed, the majority of the magnetic flux φ, a first conductive It reaches the other magnetic layers 1a, 1b without passing between the opposing portions of the coil pattern of the body layer 2a and the coil pattern of the second conductor layer 2b. As a result, there is almost no magnetic flux φ ₁ that does not interlink between both coil patterns,
Since the coupling coefficient becomes large, the transmission loss can be reduced as compared with the conventional case. In particular, when the self-inductance is large, of the magnetic flux φ, the magnetic flux φ ₁ that does not pass through both coil patterns increases the transmission loss due to the loss term (core loss) of the complex magnetic permeability of the magnetic layers 1a and 1b. but it becomes, with in comparison with the conventional configuration such flux phi ₁ is small, since the length through the magnetic layer 1a, the inside of 1b is equal to or less than half, is less affected by the core loss transmission Loss can be reduced.

The planar transformer having such a structure can be used as a transmission line transformer, a float balun, an impedance conversion balun, a branch transformer, a distribution transformer, a pulse transformer, and the like.

Embodiment 2 In the above embodiment, the first magnetic layer 1a and the second magnetic layer 1b are completely separated from each other via the insulating layer 3 made of an insulating material. In the example, as shown in FIG. 3, a part of the insulating layer 3 is formed of a magnetic material.
That is, the first conductor layer 2a and the second
The portion other than the portion of the coil pattern facing the conductor layer 2b is formed of a magnetic material.

In order to form the insulating layer 3 in such a shape, a required portion of the insulating layer 3 is removed after forming the insulating layer 3 with an insulating material in the same manner as in the first embodiment, or a necessary portion is removed in advance. After forming the insulating layer 3 made of an insulating material, a part of the insulating layer 3 may be made of a magnetic material at the same time as the second magnetic layer 1b by applying a magnetic paste. By forming a part of the insulating layer 3 from a magnetic material in this way, the first magnetic layer 1a and the second magnetic layer 1b are magnetically interposed through the magnetic material that has entered the insulating layer 3. Will be combined. As a result, the first conductor layer 2a and the second
For the magnetic flux formed around the coil pattern of the conductor layer 2b, a magnetic path close to a closed magnetic path is formed, and the inductance increases. Other configurations are the same as in the first embodiment.

(Embodiment 3) In each of the above embodiments, the first magnetic layer 1a and the second magnetic layer 1b are each formed of a magnetic paste, but in this embodiment, FIG. As described above, each of the magnetic layers 1a and 1b is formed of a plate of a magnetic material having an insulating property, and the insulating layer 3 is formed of a sheet-shaped insulating material.

That is, each plate-like magnetic layer 1a, 1
b, conductor layers 2a and 2 each having a coil pattern formed on one surface thereof.
b is applied to each of the two conductor layers 2
The two magnetic layers 1a and 1b are opposed to each other so that a and 2b face each other with the insulating layer 3 interposed therebetween. The coil patterns of the conductor layers 2a and 2b may be formed by printing or etching as in the first embodiment. Each magnetic layer 1
Ferrite thin plates and green sheets are used as a and 1b. One end of the coil pattern of each of the conductor layers 2a and 2b forms a through-hole (not shown) in the magnetic layers 1a and 1b, and is drawn out by a through-hole plating method. The other end of the coil pattern is connected to the magnetic layer 1a,
1b is connected to the terminal provided on the side. In this configuration,
The thickness of each of the magnetic layers 1a and 1b and the insulating layer 3 can be easily controlled, and particularly stable characteristics can be obtained. Other configurations are the same as in the first embodiment.

Embodiment 4 In this embodiment, as shown in FIG. 5, a plate-shaped magnetic layer 1 having conductor layers 2a and 2b on which coil patterns are formed is adhered.
a, 1b, the insulating layer 3 is formed on the first magnetic layer 1a by embedding the first conductive layer 2a, and then the second magnetic layer is formed. 1b is formed on the insulating layer 3. The insulating layer 3 is formed by applying a polymer coating material such as polyimide or depositing SiO ₂ . Other configurations are the same as in the third embodiment.

(Embodiment 5) In this embodiment, as shown in FIG. 6, a first plate-like first conductor layer 2a having a coil pattern is coated on one surface.
The insulating layer 3 is laminated on the magnetic layer 1a in such a manner that the first conductor layer 2a is buried, and the second conductor layer 2b is laminated on the insulating layer 3. Plate-like second magnetic layer 1 such that the second conductive layer 2b is sandwiched between the second conductive layer 2b and the insulating layer 3.
b is laminated. Other configurations are the same as in the first embodiment.

(Embodiment 6) In the present embodiment, as shown in FIG. 7, the opposed portions of the coil patterns of both conductor layers 2a and 2b are different from those of Embodiment 5.
The insulating layer 3 of the portion except for position is obtained by forming a magnetic material portion 3 'made of a magnetic paste.

In order to form the insulating layer 3 in such a shape, a required portion of the insulating layer 3 may be removed after forming the insulating layer 3 with an insulating material in the same manner as in the fifth embodiment. After the formation of the insulating layer 3 made of an insulating material, the magnetic portion 3 ' may be formed at a portion where the insulating material is not provided. As a method of forming the magnetic body portion 3 ' ,
A magnetic material is deposited by sputtering and then etched to form a magnetic material portion 3 ' of a required shape,
The magnetic material may be applied by sputtering in a state where the mask is formed in a required shape. By forming a part of the insulating layer 3 with a magnetic material as described above, the first
The magnetic material layer 1a and the second magnetic material layer 1b are magnetically coupled via the magnetic material of the insulating layer 3. As a result, a magnetic path close to a closed magnetic path is formed for the magnetic flux formed around the coil pattern of the first conductive layer 2a and the second conductive layer 2b, and the inductance increases. It is. Other configurations are the same as in the fifth embodiment.

Embodiment 7 In this embodiment, as shown in FIG. 8, the conductor layers 2a and 2b are arranged with a gap therebetween. Each conductor layer 2a, 2
b is laminated on the magnetic layers 1a and 1b each made of a magnetic material having an insulating property. Each magnetic layer 1a, 1
b has a relatively large thickness and sufficient strength.
Spacers 5a formed of a magnetic material are provided between the two magnetic layers 1a and 1b, except for between the opposing portions of the coil patterns of the two conductive layers 2a and 2b, and inside and outside the spiral. , 5b are provided. Here, the coil pattern is formed in a spiral shape as shown in FIG. 9, and a through hole 6 is formed at the center of the spiral in the thickness direction of the laminate having the above-described configuration. The first spacer 5a disposed inside the spiral is formed in a substantially U-shape, and one end of the first conductive layer 2a and the second conductive layer 2b is formed through the opening of the first spacer 5a. 6 and can be connected to an external line through the through hole 6. The second spacer 5b disposed outside the spiral is formed in a partially cutout rectangular shape, and the other end portions of the first conductor layer 2a and the second conductor layer 2b are laminated through the notch portion. It is pulled out to the side of the body and can be connected to an external line.

As described above, the first conductor layer 2a and the second
By forming a gap between the portions opposed to the conductor layer 2b, the relative dielectric constant of this portion can be made substantially 1, and
The stray capacitance existing between the first conductor layer 2a and the second conductor layer 2b can be made smaller than that when the first conductor layer 2a and the second conductor layer 2b are filled with an insulating material having a relative dielectric constant larger than 1. Further, since the spacers 5a and 5b are formed of a magnetic material, the magnetic resistance between the magnetic layers 1a and 1b is reduced, and the magnetic flux formed around the coil pattern of each of the conductor layers 2a and 2b is reduced. It follows a path close to a closed magnetic circuit. As a result, the coupling coefficient can be increased, and the transmission loss can be reduced. Here, for example, ferrite can be used for the magnetic layers 1a and 1b and the spacers 5a and 5b, but other magnetic materials may be used as long as they are insulating magnetic materials. Also, the coil pattern is not limited to a spiral shape.

(Embodiment 8) As shown in FIG. 10, this embodiment is different from the configuration of Embodiment 7 in that an insulating layer is provided between each magnetic layer 1a, 1b and each conductor layer 2a, 2b. The difference is that insulating layers 3a and 3b made of a material are interposed, and the magnetic layers 1a and 1b are backed by substrates 4a and 4b made of an insulating material, respectively. By adopting such a configuration, a magnetic material having no insulating property can be used as a magnetic material for forming the magnetic layers 1a and 1b.
4b ensures the strength. Therefore, a thin permalloy plate or the like can be used as the magnetic layers 1a and 1b, and permalloy or the like can be used for the spacers 5a and 5b. On the other hand, glass or the like can be used for the insulating layers 3a and 3b and the substrates 4a and 4b.
Here, it goes without saying that a magnetic material other than permalloy can be used for the magnetic layers 1a and 1b and the spacers 5a and 5b. Other configurations are the same as in the seventh embodiment.

[0044]

According to the first aspect of the present invention, a first magnetic layer formed of a magnetic paste laminated on a substrate and a non-magnetic insulating material laminated on the first magnetic layer are provided. By
Comprises a formed insulating layer, a second magnetic layer formed by magnetic paste laminated on the insulating layer, the first conductive layer is laminated on the first magnetic layer embedded in insulation <br/> edge layer with the second conductor layer is laminated on the insulating layer
It is embedded in the second magnetic layer with the, opposite of the coil pattern in the first conductive layer and the second conductive layer
Since not provided a magnetic material between the site, by magnetic material layer is formed by a magnetic paste, manufacturing is facilitated. Here, the first conductor layer is buried in the insulating layer on the first magnetic layer, and the second conductor layer is laid on the insulating layer in the second magnetic layer. By adopting the structure embedded in the layers, the first and second conductor layers are brought into close contact with the first and second magnetic layers without gaps, respectively, thereby increasing the self-inductance and reducing the number of turns. As a result, it is possible to provide a transformer having a small stray capacitance and suitable for high frequency use, and to reduce the size of the transformer.

The invention according to claim 2 is characterized in that the first and second second
The coil patterns of the conductor layers are plate-like first and
And on one side of the second magnetic layer,
Work becomes easier. Moreover, sheet-like insulation is used as the insulation layer.
Materials can be used to control the thickness of the insulating layer
And the characteristics can be further stabilized.

According to a third aspect of the present invention, the coil of the first conductor layer is provided.
A pattern is applied to one surface of the plate-shaped first magnetic layer,
Formed so that the first conductor layer is laminated on the first magnetic layer
Embedded in the formed insulating layer and laminated on the insulating layer.
Whether the second magnetic layer sandwiches the conductor layer of the above with the insulating layer
This is advantageous when precisely controlling the positional relationship between the two conductor layers.
It is.

According to a fourth aspect of the present invention, the coil pattern is straddled.
Terminal of each coil pattern can be connected to external line without using line
Can be connected to the road.

According to a fifth aspect of the present invention, the first conductive layer and
Secondly, a small amount of the conductor layer except for the portion facing the coil pattern is removed.
Since at least some of the insulating layers are made of a magnetic material,
A magnetic material is provided between the first magnetic material layer and the second magnetic material layer.
A magnetic path is formed, which increases the magnetic efficiency and
Transmission loss can be further reduced.

According to a sixth aspect of the present invention, there is provided a coil conductor comprising both conductor layers.
Since there is a gap between the opposing parts of the turn, both coils
The relative dielectric constant between the patterns becomes almost 1, and both coil patterns
The space between them is higher than when the insulation material is filled.
Free capacitance can be reduced and high frequency short-circuit due to stray capacitance
Can be prevented.

According to the seventh and eighth aspects of the present invention, the coil of both conductive layers is provided.
Spacers are placed in areas other than the areas facing the pattern
Support material that forms a gap between the two conductor layers
Has the effect of reducing stray capacitance.
You.

The magnetic invention of claim 9, since the portion other than between the opposing part of the coil pattern of the two conductive layers are disposed spacers magnetic material through the magnetic flux is formed around the coil pattern As a result, the magnetic resistance of the road is reduced, and the transmission loss can be reduced. In addition, since this spacer is also used as a support material for forming a gap between both conductor layers, there is an advantage that an effect of increasing magnetic efficiency and an effect of reducing stray capacitance can be obtained with a small number of components. It has .

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a first embodiment.

FIG. 2 is an operation explanatory diagram of the first embodiment.

FIG. 3 is a sectional view showing a second embodiment.

FIG. 4 is an exploded sectional view showing a third embodiment.

FIG. 5 is an exploded sectional view showing a fourth embodiment.

FIG. 6 is an exploded sectional view showing a fifth embodiment.

FIG. 7 is a sectional view showing a sixth embodiment.

FIG. 8 is a sectional view showing a seventh embodiment.

FIG. 9 is a plan view showing a seventh embodiment.

FIG. 10 is a sectional view showing an eighth embodiment.

FIG. 11 is a circuit diagram showing a transmission line transformer.

FIGS. 12A and 12B are perspective views each showing a conventional transmission line transformer.

FIG. 13 is a circuit diagram showing a balun.

FIG. 14 is a perspective view showing a conventional balun.

FIG. 15 is a circuit diagram showing a distribution circuit.

FIG. 16 is a perspective view showing a conventional distribution transformer.

FIG. 17 is a circuit diagram showing a branch circuit.

FIG. 18 is a perspective view showing a conventional branch transformer.

FIG. 19 is an exploded perspective view showing a conventional flat transformer.

[Explanation of symbols]

1a Magnetic layer 1b Magnetic layer 2a Conductor layer 2b Conductor layer 3 Insulating layer 3 'Magnetic part 3a Insulating layer 3b Insulating layer 4 Substrate 4a Substrate 4b Substrate 5a Spacer 5b Spacer 6 Through hole

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-171705 (JP, A) JP-A-1-151212 (JP, A) JP-A-49-68621 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) H01F 19/00 H01F 17/00 H01F 27/28

Claims (9)

(57) [Claims] 1. A first conductive material layer, the second conductor layer and the two coil pattern formed of another coil pattern in another one plane forming a coil pattern in one plane
In but a flat surface transformer arranged to magnetically couple to face, a first magnetic layer formed by magnetic paste laminated on a base plate, on the first magnetic layer An insulating layer formed of a laminated non-magnetic insulating material ; and a second magnetic layer formed of a magnetic paste laminated on the insulating layer , wherein the first conductive layer is formed of the first conductive layer. while being laminated on the magnetic layer is embedded in the insulating layer,
The second conductive layer first with laminated on the insulating layer 2
Of embedded in the magnetic layer, planar transformer between opposing portions of the coil pattern in the first conductive layer and the second conductive layer, characterized in that they are not provided magnetic material. 2. A coil pattern is formed in one plane.
A first conductor layer and another coil path in another plane.
The second conductor layer having the turns formed thereon is connected to both coil patterns.
Plane tigers that are arranged so that
The coil pattern of the first conductor layer is
Plate-shaped first magnetic layer and second conductor layer
Plate-like second magnet with a coil pattern attached on one side
Interposed between the body layer and the first and second conductor layers
An insulating layer made of a non-magnetic insulating material.
Coil patterns in the first conductor layer and the second conductor layer
Planar transformer, characterized in that they are not provided magnetic material between opposing portions of the over down. 3. A coil pattern is formed in one plane.
A first conductor layer and another coil path in another plane.
The second conductor layer having the turns formed thereon is connected to both coil patterns.
Plane tigers that are arranged so that
The coil pattern of the first conductor layer is
Plate-shaped first magnetic layer attached to the first magnetic layer, and the first magnetic layer
The first surface on which the first conductor layer is formed
Non-magnetic insulating material laminated with the conductor layer embedded
And an insulating layer formed on the insulating layer.
And a second magnetic layer sandwiching the conductive layer between the insulating layer and the conductive layer.
The coil pattern of the first conductor layer and the second conductor layer
Planar transformer, characterized in that they are not provided magnetic material between opposing portions of the over down. 4. The method according to claim 1, wherein the first magnetic layer and the second magnetic layer have a small size.
Through the through hole formed in at least one of the first conductors
The terminal of the coil pattern of the layer and the second conductor layer to the outside
It is characterized by drawing out so that it can be connected to the track
The planar transformer according to any one of claims 1 to 3 . 5. The method according to claim 1, wherein the first conductive layer and the second conductive layer
Insulation of at least part of the coil pattern excluding the opposing part
The layer is formed of a magnetic material.
The planar transformer according to any one of claims 1 to 4 . 6. The first and the conductive layer, the second conductor layer and the two coil pattern formed of another coil pattern in another one plane forming a coil pattern in one plane
In the flat surface transformer but arranged to magnetically couple to face, the first conductive layer and the second conductive layer
A magnetic body is provided between the opposing parts of the coil pattern as a gap.
A flat type transformer characterized by not being lit. 7. The coil pattern of the first conductor layer has one surface
A first magnetic layer deposited by a plate-shaped, the second conductive layer
Of the second magnetic layer deposited by a plate-shaped into a coil pattern one face, a spacer provided at a different site from the opposite site of the coil pattern of the first conductive layer and the second conductive layer 7. The flat transformer according to claim 6, wherein the first magnetic layer and the second magnetic layer are formed of a magnetic material having an insulating property. 8. A first magnetic layer in which a first conductor layer is laminated on one surface of a front and back via a first insulating layer made of an insulating material, and a first substrate made of an insulating material is laminated on the other surface. And a second magnetic layer in which a second conductor layer is laminated on one surface of the front and back via a second insulating layer made of an insulating material, and a second substrate made of an insulating material is laminated on the other surface. A first conductor layer and a second conductor layer;
7. The flat type transformer according to claim 6, wherein the conductive layer is opposed to the coil pattern via a spacer provided at a portion different from the opposed portion of the coil pattern. 9. The flat transformer according to claim 7, wherein the spacer is a magnetic material.