JPH0823212A - Irreversible circuit element - Google Patents

Abstract

PURPOSE:To provide an inexpensive irrevesible circuit element of high performance by specifying the shape of a magnetic element. CONSTITUTION:A rectangular parallelepiped shape is specified for a magnetic element 1, and a ratio of 2:31/2 is set between the long and short sides of the element 1 on one of its faces. Then the center electrodes 2a, 2b and 2c are buried into the element 1 so that these electrodes cross to each other at angles of 120 deg.. The electrode 2a is set at the center of the element 1 and in parallel to its long sides. In such a constitution, the same length is secured among those electrodes 2a-2c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-reciprocal circuit device such as an isolator or a circulator used in a microwave band mobile communication device.

[0002]

2. Description of the Related Art In recent years, in mobile communication and the like, downsizing and general-purpose use of communication devices have been progressing, and there is an increasing demand for downsizing and cost reduction of nonreciprocal circuit elements used in these devices. It is increasing. A non-reciprocal circuit device in which a center electrode is embedded inside a magnetic device has been proposed for the purpose of downsizing.

As a magnetic element in which a center electrode is embedded inside such a magnetic material, a disk-shaped element as shown in FIG. 6 is conventionally used. In FIG. 6, the magnetic element 1 constitutes a 3-port nonreciprocal circuit element,
Inside the magnetic element 1, there are three center electrodes 2a, 2b, 2
c are embedded so as to intersect each other at an angle of 120 degrees. At one end of each of the center electrodes 2a, 2b, 2c, a capacitance electrode portion 3 for obtaining a matching capacitance is formed integrally with the center electrode. The magnetic element 1 is formed by, for example, a method of laminating a plurality of magnetic green sheets including three magnetic green sheets having a center electrode or the like formed on the surface thereof by printing, etc. ing.

As shown in FIG. 7, this magnetic element 1 is obtained by forming a plurality of magnetic elements 1 on a magnetic parent substrate 11 and then punching or cutting out the individual magnetic elements 1. ing.

[0005]

However, when the shape of the magnetic element is a disk as described above, as shown in FIG. 7, the magnetic element is formed between the magnetic elements and in the peripheral portion of the magnetic parent substrate. A wasteful part is generated, and the yield of magnetic material decreases,
There is a problem that the material cost is increased accordingly.

Further, the shape of the magnetic element is a hexagonal column,
There is also a method to improve the yield of the magnetic material, but in this case as well, it is not possible to eliminate the wasted part of the magnetic material, and a special die or method is required for cutting out from the magnetic parent substrate. However, there is a problem that the manufacturing cost becomes high.

Therefore, as shown in FIG.
There is proposed a magnetic body element 1 in which the shape of is formed in a quadrangular prism shape (rectangular parallelepiped shape), for example, a square plate shape, to improve the yield of the magnetic body material and to easily cut out from the magnetic body parent substrate 11. . However, in this case, the lengths of the three center electrodes formed inside the magnetic element cannot be the same, and the symmetry of the three ports is deteriorated, resulting in a problem that electrical characteristics are deteriorated. there were.

Therefore, an object of the present invention is to solve the above problems of the conventional non-reciprocal circuit element and to specify the shape of the magnetic element to reduce the material cost and the manufacturing cost. It is to provide a non-reciprocal circuit device that improves the symmetry of ports and is inexpensive and high performance.

[0009]

In order to achieve the above object, the present invention provides a magnetic element to which a DC magnetic field is applied.
In a non-reciprocal circuit device in which two center electrodes are arranged so as to intersect each other at an angle of 120 degrees, the magnetic device has a rectangular parallelepiped shape, and one surface thereof has a long side to short side ratio of 2: √3. It is characterized in that any one of the center electrodes is formed in parallel with the long side at the center portion between the long sides.

[0010]

According to the above structure, since the magnetic element is formed in a rectangular parallelepiped shape and the ratio of the long side to the short side is 2: √3, waste of the magnetic material is eliminated and 3 The two center electrodes can have the same length.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing the embodiments thereof. In the figure, the same or corresponding parts and those having the same functions as those in the conventional example are designated by the same reference numerals.

FIGS. 1 and 2 show the structures of a magnetic material element and a magnetic material parent board constituting a non-reciprocal circuit element according to an embodiment of the present invention. FIG. 1 is an external perspective view of a magnetic substance element, and FIG. 2 is a plan view of a magnetic substance parent substrate on which a large number of magnetic substance elements shown in FIG. 1 are formed.

As shown in FIG. 1, the magnetic element 1 of the present embodiment is formed in a rectangular parallelepiped shape (rectangular plate shape), and three center electrodes 2a, 2b, 2c are embedded and integrated therein. It has a structure. The center electrodes 2a, 2b, 2c are arranged in the magnetic element 1 so as to be electrically insulated from each other through the magnetic body and to intersect each other at an angle of 120 degrees. , Magnetic element 1
Exposed on the side of. In addition, each center electrode 2a, 2
A capacitance electrode portion 3 for obtaining a matching capacitance is integrally formed with the center electrode at one end of each of b and 2c.

In this embodiment, one surface parallel to the center electrode formation surface of the magnetic element 1 is formed so that the ratio of the long side L and the short side W is 2: √3, and one center electrode is formed. 2a is arranged in parallel with the long sides and in the center portion between the long sides. That is, the center electrodes 2a, 2b, 2c are formed to have the same length.

A magnetic element in which a center electrode is embedded in such a magnetic material is, for example, a plurality of magnetic green sheets including three magnetic green sheets having a central electrode formed on the surface by printing or the like. Are laminated, pressure-bonded and integrally fired, and the like. Then, as shown in FIG. 2, this magnetic material element is obtained by forming a plurality of the magnetic material elements 1 on the magnetic material parent substrate 11 and then punching or cutting out the individual magnetic material elements 1.

FIG. 3 shows an example of the overall structure of a nonreciprocal circuit device constructed by using this magnetic material device. As shown in FIG. 3, the magnetic element 1 is provided with an external electrode such as a ground electrode and an input / output electrode for each port on its outer surface.

The non-reciprocal circuit device shown in FIG. 3 has an input / output terminal and a ground terminal formed on the inner and outer surfaces thereof, and a resin case 5 having a through hole into which a permanent magnet 6 is fitted. The magnetic element 1 is inserted, the permanent magnet 6 is placed on the upper surface of the magnetic element 1, and the yoke 7 is mounted so as to sandwich the magnetic element 1, the permanent magnet 6 and the upper portion of the resin case 5. ing. A magnetic closed circuit is formed by the yoke 7, and a DC magnetic field is applied to the magnetic element 1 by the permanent magnet 6.

As described above, in the magnetic element of the present embodiment, one surface of the magnetic element is rectangular, and as shown in FIG. 2, there is no waste of the magnetic material, and
The punching or cutting operation can be easily performed without using a complicated mold, and thus the material cost and the manufacturing cost can be significantly reduced. Further, since the one surface is rectangular, the direction can be easily discriminated, the insertion direction error at the time of assembling the non-reciprocal circuit element is eliminated, and the workability is improved.

Furthermore, since the three center electrodes are formed to have the same length, the symmetry of the three ports is improved, and the electrical characteristics can be improved.

Therefore, if this magnetic element is used,
An inexpensive and high-performance non-reciprocal circuit device can be obtained.

In the above embodiment, the capacitance electrode portion for obtaining the matching capacitance of each port is formed at one end of each center electrode, but it is not always necessary to form the capacitance electrode portion, as shown in FIG. In addition, the central electrode may not have the capacitive electrode portion. In this case, the electrostatic capacitance distributed between the respective center electrodes is used as the matching capacitance, or the matching capacitance is added to the outside for use.

Further, in the above-mentioned embodiment, each center electrode is formed by one line, but each center electrode may be formed by two lines as shown in FIG. It may be configured with three or more lines.

Further, in the above-described embodiment, the structure in which each center electrode is embedded in the magnetic element has been described, but the present invention is not limited to this, and a metallic conductor or the like is arranged on the surface of the magnetic element. It may be one.

In short, according to the present invention, one surface of the magnetic material forming the nonreciprocal circuit element is formed into a rectangle having a ratio of long sides to short sides of 2: √3, and three center electrodes arranged in the magnetic element are arranged. The lengths are the same, and other configurations are not particularly limited.

[0025]

As described above, according to the nonreciprocal circuit device of the present invention, the shape of the magnetic material element is a rectangular parallelepiped shape, a wasteful portion of the magnetic material is not generated, and the magnetic material is complicated. It can be manufactured without using a special mold or method, and the material cost and manufacturing cost of the magnetic element can be significantly reduced. Further, the direction of the magnetic element can be easily discriminated, the number of steps for assembling the non-reciprocal circuit element and defects can be reduced, and the manufacturing cost can be reduced.

Further, the three center electrodes arranged in the magnetic element can be formed to have the same length, and the symmetry of the three ports can be greatly improved, so that the electrical characteristics can be improved. .

[Brief description of drawings]

FIG. 1 is a perspective view of a magnetic element according to an embodiment of the present invention.

FIG. 2 is a plan view of a magnetic parent substrate on which a large number of magnetic elements shown in FIG. 1 are formed.

FIG. 3 is an exploded perspective view showing an overall configuration of a nonreciprocal circuit device according to an embodiment of the present invention.

FIG. 4 is a perspective view of a magnetic element according to another embodiment of the present invention.

FIG. 5 is a perspective view of a magnetic element according to another embodiment of the present invention.

FIG. 6 is a perspective view of a conventional disc-shaped magnetic element.

7 is a plan view of a magnetic parent substrate on which a large number of magnetic elements shown in FIG. 6 are formed.

FIG. 8 is a plan view of a magnetic parent substrate on which a large number of conventional square plate-shaped magnetic elements are formed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic element 2a, 2b, 2c Central electrode 3 Capacitive electrode part 5 Resin case 6 Permanent magnet 7 Yoke

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kunizaburo Banno 2 26-10 Tenjin Tenjin, Nagaokakyo-shi, Kyoto Murata Manufacturing Co., Ltd.

Claims (1)

[Claims] 1. A magnetic element to which a DC magnetic field is applied
In a non-reciprocal circuit device in which two center electrodes are arranged so as to intersect each other at an angle of 120 degrees, the magnetic material device has a rectangular parallelepiped shape, and one surface thereof has a ratio of a long side to a short side of 2: √3. And a center electrode of any one of the center electrodes is formed in parallel with the long side at a central portion between the long sides.