JP2002043128A - Spiral inductance device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spiral inductance device, which has a wide frequency range and in which two coils which have small sizes and do not interfere with each other, can be used as inductance element at a high frequency. SOLUTION: Since most conductors 2a and 3a of first and second coils 2 and 3, provided on both surfaces of a dielectric layer 1, do not face each other in this spiral inductance device, not only electrostatic coupling (C-coupling) becomes very small, but induction coupling (L-coupling) also becomes very small, when the coils 2 and 3 are used as two separate inductance elements. Therefore, an inductance device, in which two coils little interfere with each other, can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spiral inductance device suitable for use in electronic equipment such as a transmission / reception unit used in a portable telephone.

[0002]

2. Description of the Related Art In a conventional spiral inductance device, if a spiral coil is formed only on one surface of a dielectric layer, the area occupied by the spiral coil increases and the size of electronic equipment increases. As shown,
In some cases, spiral first and second coils 12 and 13 are provided on both surfaces of the dielectric layer 11 to reduce the occupied area.

Next, the structure of a conventional spiral inductance device will be described with reference to FIGS. 5 and 6. The dielectric layer 11 on which various electric components (not shown) are mounted and a desired electric circuit is formed is described. The first and second spiral coils 12 and 13 formed by the conductors 12a and 13a made of conductive patterns are formed at positions facing each other.

The first and second coils 12, 13
When viewed from one side of the dielectric layer 11, the first coil 12 provided on one side and the second coil 1 provided on the other side
3 is wound in different directions (the first coil 12 is clockwise and the second coil 13 is counterclockwise), and when used as an inductance element, the first and second coils 12 and 12 13 are formed so as to be wound in the same direction.

[0005] The first and second coils 12, 13 are connected to connecting portions 12b, 13b provided at a central portion.
And connection portions 12c and 13c provided at the outermost end portions, and the connection portions 12b and 13b located at the center of the first and second coils 12 and 13 face each other with the dielectric layer 11 interposed therebetween. It is provided in the position where it does. Further, with respect to the first coil 12, the second coil 13 has a state in which some conductors 13 a cross between the conductors 12 a of the first coil 12, and most of the remaining conductors 13 a sandwich the dielectric layer 11. It is arranged facing the conductor 12a of the first coil 12.

As a first example of use of the spiral inductance device having such a configuration, a wire connection line (not shown) is provided from each of the connection portions 12b and 13b of the first and second coils 12 and 13. And the other connecting portions 12c and 13c are connected to a conductive pattern provided on the dielectric layer 11 so that the first and second coils 12 and 13 are used as separate inductance elements.

FIG. 7 shows an equivalent circuit diagram of the first use example. In the first use example, most of the conductors 12a and 13 of the first and second coils 12 and 13 are provided.
a are opposed to each other, and as shown in the equivalent circuit diagram of FIG. 7, not only the electrostatic coupling (C-coupling) is extremely large, but also the inductive coupling (L-coupling) is extremely large, and interference occurs with each other. It was a compatible inductance device.

[0008] Further, this spiral inductance device has a first and second coils 12 and
There is a method in which the connection portions 12b and 13b located at the center of the connection portion 13 are connected to each other by a through-hole conductor (not shown), and the first and second coils 12 and 13 are used as one inductance element.

FIG. 8 shows an equivalent circuit diagram in the second use example. In the second use example, most of the conductors 12 a and 13 of the first and second coils 12 and 13 are provided.
a are opposed to each other, the electrostatic coupling (C-coupling) is extremely large as shown in the equivalent circuit diagram of FIG. 7. Therefore, when this is used for a high-frequency device, the self-resonant frequency becomes As a result, the frequency range that can be used as an inductance element is narrowed.

[0010]

In the conventional spiral inductance device, most of the conductors 12 of the first and second coils 12 and 13 provided on both surfaces of the dielectric layer 11 are provided.
a, 13a are opposed to each other, so that the first and second coils 1
When the two inductors 2 and 13 are used as two separate inductance elements, most of the conductors 12a and 13a of the first and second coils 12 and 13 are in a state of facing each other. ) Is extremely large, and the inductive coupling (L-coupling) is also extremely large, causing a problem of mutual interference.

When the first and second coils 12 and 13 are used as one inductance element, the first and second coils
Since most of the conductors 12a and 13a of the coils 12 and 13 face each other, electrostatic coupling (C coupling)
Is extremely large, so that when it is used in a high-frequency device, the self-resonant frequency is lowered, and there is a problem that the frequency range that can be used as an inductance element is narrowed.

An object of the present invention is to provide a spiral inductance device which is small in size, has little interference with each other, and has a wide frequency range which can be used as an inductance element at a high frequency.

[0013]

As a first means for solving the above-mentioned problems, a spiral layer formed of a conductor made of a conductive pattern is provided on both sides of the dielectric layer at positions facing each other. First and second coils,
The first and second coils are formed so as to be wound in the same direction, and the second coil has a portion of the conductor crossing the conductor of the first coil with respect to the first coil. In this state, the remaining conductors were arranged between the conductors of the first coil.

[0014] As a second solution, the first and second methods are described.
The second coil had a configuration in which connection portions located at the center were connected to each other.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings of the spiral inductance device of the present invention, FIG. 1 is a plan view of a main part of the spiral inductance device of the present invention, and FIG.
FIG. 3 is a cross-sectional view taken along line 2, FIG. 3 relates to a spiral inductance device of the present invention, and is an equivalent circuit diagram showing a first usage example;
FIG. 4 relates to the spiral inductance device of the present invention,
FIG. 9 is an equivalent circuit diagram showing a second usage example.

Next, the structure of the spiral inductance device according to the present invention will be described with reference to FIGS. 1 and 2. A dielectric layer on which various electric components (not shown) are mounted and a desired electric circuit is formed. On both surfaces of the first coil 1, spiral first and second coils 2 and 3 formed of conductors 2a and 3a made of conductive patterns are formed at positions facing each other.

The first and second coils 2 and 3 are:
When viewed from one surface side of the dielectric layer 1, the first coil 2 provided on one surface side and the second coil 3 provided on the other surface side are wound in mutually different directions (the first coil 2 is clockwise. , The second coil 3 is in a counterclockwise direction), and when used as an inductance element, the first and second coils 2 and 3 are formed so as to be wound in the same direction. I have.

The first and second coils 2 and 3 have connecting portions 2b and 3b provided at a portion located at a central portion and connecting portions 2c and 3c provided at outermost ends, respectively. 1st, 2nd
The connection parts 2b, 3b located at the center of the coils 2, 3 are:
They are provided at positions facing each other with the dielectric layer 1 interposed therebetween. Furthermore, with respect to the first coil 2, the second coil 3 is arranged such that a part of the conductor 3 a crosses the conductor 2 a of the first coil 2 and the other conductor 3 a is disposed between the conductors 2 a of the first coil 2. ing.

As a first example of use of the spiral inductance device of the present invention having such a configuration, as a first example of use, a wire connection line (FIG. 1) is connected to each of the connection portions 2b and 3b of the first and second coils 2 and 3. (Not shown), and the other connecting portions 2c, 3c are connected to a conductive pattern provided on the dielectric layer 1 so that the first and second coils 2, 3
3 is used as a separate inductance element.

FIG. 3 shows an equivalent circuit diagram in the first use example. In the first use example, most of the conductors 2a, 3a of the first and second coils 2, 3 are mutually connected. As shown in the equivalent circuit diagram of FIG. 3, the inductance device is not only extremely small in electrostatic coupling (C-coupling) but also very small in inductive coupling (L-coupling), and has little interference with each other. Is obtained.

The spiral inductance device has a first and second coils 2 and 3 as a second example of use.
Are connected to each other by through-hole conductors (not shown), and the first and second coils 2 and 3 are used as one inductance element.

FIG. 4 shows an equivalent circuit diagram in the second use example. In the second use example, most of the conductors 2a and 3a of the first and second coils 2 and 3 are mutually connected. As shown in the equivalent circuit diagram in FIG. 4, the electrostatic coupling (C-coupling) is extremely small due to the non-facing state. Therefore, when this is used for a high-frequency device, the self-resonant frequency becomes very high. As a result, the frequency range that can be used as an inductance element is widened.

[0023]

In the spiral inductance device of the present invention, most of the conductors 2a, 3a of the first and second coils 2, 3 provided on both surfaces of the dielectric layer 1 are in a non-opposed state. When the first and second coils 2 and 3 are used with two separate inductance elements, not only the electrostatic coupling (C-coupling) is extremely small, but also the inductive coupling (L-coupling) is extremely small, and the inductance that causes little interference with each other is obtained. Equipment can be provided.

The connecting portions 2b and 3b located at the center of the first and second coils 2 and 3 provided on both surfaces of the dielectric layer 1 are connected to each other, and the first and second coils 2 and 3 are connected to each other. When used as two inductance elements, most of the conductors 2a, 3a of the first and second coils 2, 3 are in a non-opposing state, so that the electrostatic coupling (C coupling) is extremely small,
Therefore, when this is used for a high-frequency device, a self-resonant frequency becomes very high, and a spiral inductance device in which a frequency range usable as an inductance element can be widened can be provided.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a spiral inductance device of the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG. 1;

FIG. 3 is an equivalent circuit diagram showing a first use example of the spiral inductance device according to the present invention.

FIG. 4 is an equivalent circuit diagram showing a second example of use of the spiral inductance device of the present invention.

FIG. 5 is a plan view of a main part of a conventional spiral inductance device.

FIG. 6 is a sectional view taken along line 6-6 in FIG. 5;

FIG. 7 relates to a conventional spiral inductance device;
FIG. 4 is an equivalent circuit diagram showing a first usage example.

FIG. 8 relates to a conventional spiral inductance device;
FIG. 9 is an equivalent circuit diagram showing a second usage example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dielectric layer 2 1st coil 2a conductor 2b connection part 2c connection part 3 2nd coil 3a conductor 3b connection part 3c connection part

Claims (2)

[Claims] A first spiral coil formed of a conductor made of a conductive pattern at a position facing each other on both surfaces of the dielectric layer;
The second coil is formed so as to be wound in the same direction, and the second coil is arranged such that a part of the conductor crosses the conductor of the first coil with respect to the first coil. A spiral inductance device, wherein the conductor is disposed between the conductors of the first coil. 2. The first and second coils are connected at a connection portion located at a central portion.
A spiral inductance device as described.