JP2000349510A - Irreversible circuit component and lumped constant isolator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an irreversible circuit component and a lumped constant isolator that the design is facilitated and the miniaturization is realized. SOLUTION: The irreversible circuit components is provided with a ferrite board 5, a strip line aggregate 1, a magnet 6 that applies a magnetic field to the ferrite board 5, capacitors 9, 10, 11 connected to the strip line aggregate 1, a terminal base 12 connected to the strip line aggregate 1, and upper/lower cases 7, 16 that contain each member. The upper case 16 is integrated between side walls of the lower case 7 opposite to each other.

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 and a lumped-constant type isolator used for devices related to wireless communication.

[0002]

2. Description of the Related Art A lumped constant type isolator is used as a non-reciprocal circuit device used in a terminal of a mobile communication device. The isolator is placed between the power amplifier and the antenna in the transmission section of the mobile communication device, and is used for the purpose of preventing backflow of unnecessary signals to the power amplifier, stabilizing the impedance on the load side of the power amplifier, etc. ing.

[0003] With the miniaturization of communication equipment, miniaturization of non-reciprocal circuit elements such as isolators is required.

[0004]

However, in the above configuration, further miniaturization is required as described above.
For example, when a ferrite substrate, a magnet, and the like are miniaturized, there is a problem that options are extremely narrowed in terms of characteristics and constituent materials, and design becomes very difficult.

An object of the present invention is to provide a non-reciprocal circuit device and a lumped-constant isolator which can be easily designed and can be downsized.

[0006]

According to the present invention, an upper case comprises:
It is configured to be incorporated inside the lower case.

[0007]

DETAILED DESCRIPTION OF THE INVENTION The invention according to claim 1 is a ferrite substrate, a strip line assembly provided in close proximity to the ferrite substrate, a magnet for applying a magnetic field to the ferrite substrate, and the strip assembly. A capacitor connected to the stripline assembly, a terminal base connected to the stripline assembly, and an upper and lower case for housing the members,
The upper case is configured to be incorporated between the opposite side walls of the lower case, so that the effective area for mounting each member on the lower case is reduced without increasing the outer dimensions of the element in miniaturizing the element. Can be secured.

According to a second aspect of the present invention, in the first aspect, at least a part or the whole of the side wall of the upper and lower cases is configured to have a spring property by bending to facilitate assembly. And productivity can be improved.

According to a third aspect of the present invention, at least one of the side walls of the upper and lower cases is processed to facilitate positioning, for example, convex portions are provided at both ends of the side wall of the upper case. By adopting a configuration in which a concave portion in which the convex portion fits is provided on the side wall of the lower case, assembly can be facilitated and productivity can be improved.

According to a fourth aspect of the present invention, a resistor is connected to at least one strip line of the strip line assembly of the non-reciprocal circuit device according to any one of the first to second aspects. In addition, in miniaturization of the element, an effective area for mounting each member of the lower case can be secured without increasing the external dimensions of the element.

FIG. 1 is an exploded perspective view showing a non-reciprocal circuit device according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a strip line assembly, and the strip line assembly 1 includes a plurality of strip lines 2, 3, and 4. Terminals 2a, 3a, and 4a are provided at ends of the strip lines 2, 3, and 4, respectively.

Reference numeral 5 denotes a ferrite substrate on which the strip line assembly 1 is wound, 6 denotes a magnet for applying a magnetic field to the ferrite substrate 5, 7 denotes a lower case, and an insulator 8 is provided in the lower case 7 and a capacitor 9 is provided. , 10, and 11 are mounted, and the lower case 7 has capacitors 9, 10, 1
At least one of the electrodes is electrically connected.

Terminals 2a, 3a, and 4a are respectively connected to the other electrodes of the capacitors 9, 10, and 11.

Reference numeral 12 denotes a terminal base, on which terminals 13 and 14 are provided.
Are electrically connected to terminals 2a and 3a, respectively.

Reference numeral 7 denotes a lower case having a U-shaped cross section, and reference numeral 16 denotes an upper case which is open on one side.

In the above configuration, the lower case 7 includes the resistor 1
The lumped-constant isolator can be formed by joining one electrode 7 and connecting the terminal 4a to the other electrode.

In assembling the non-reciprocal circuit device, first, the ferrite substrate 5 is wound so as to cover the strip line assembly 1, and one surface of the ferrite substrate 5 is brought into contact with the lower case 7. Capacitors 9, 10, and 11 having one electrode bonded to lower case 7 are mounted, and terminals 2a, 3a, and 4a are bonded to the other electrodes of capacitors 9, 10, and 11, respectively. Terminals 13 and 14 have terminals 2a and 3a, respectively.
And the ferrite substrate 5 wound around the through-hole 15 of the terminal base 12 so as to cover the strip line assembly 1 so as to surround the ferrite substrate 5.
Terminals 2a, 3 are connected to the other electrodes of the capacitors 9, 10, 11 respectively.
a, 4a are joined and fixed to the lower case 7 so as to press the joined portions.

The above components and the magnet 6 are connected to the respective cases 7, 1
6, the non-reciprocal circuit device is assembled.

Hereinafter, each component will be described in detail.

First, the strip line assembly 1 will be described.

As shown in FIG. 2, the strip line assembly 1 is preferably formed of a metal material such as copper, gold, silver or the like in a sheet shape having a predetermined shape. It is very advantageous to use the one to which the above additives are added in terms of electric characteristics, workability, and cost. In the present embodiment, the stripline assembly 1 is configured as a sheet, but may be a linear.

Further, in the present embodiment, the strip line assembly 1 is composed of three strip lines 2, 3, and 4. However, it may be composed of four or more strip lines.

Further, in the present embodiment, the strip lines 2, 3, and 4 are formed integrally with each other at a central portion (not shown) to form a substantially Y-shape. You may comprise separately.

In the present embodiment, the strip line assembly 1 is wound around the ferrite substrate 5 and arranged to save space. However, the strip line assembly 1 may be brought close to one surface of the ferrite substrate 5. Configurations are also possible.

Although not shown, an insulating sheet is provided between each of the strip lines 2, 3, and 4, and is electrically insulated.

More specifically, it is preferable to use a rolled copper foil (25 μm to 60 μm) as the strip line assembly 1, and if the thickness is 25 μm or less, disconnection or the like is likely to occur, resulting in poor productivity and the like. When it is 60 μm or more, it is not suitable for thinness. It is preferable that the rolled copper foil be plated with a conductive metal material such as silver or gold with a thickness of 1 μm to 5 μm. With such a configuration, the conductivity of the surface of the strip line assembly 1 is improved. And the characteristics can be improved.

Next, the ferrite substrate 5 will be described.

The ferrite substrate 5 has a disk shape, a square plate shape,
It can take the form of an elliptical plate, a polygonal plate, or the like, and preferably has a disk shape from the viewpoint of characteristics and the like.

The ferrite substrate 5 is made of Fe, Y, A
It is preferably a magnetic material containing l, Gd, and the like.

When the strip line assembly 1 is wound around the ferrite substrate 5, it is necessary to form a predetermined chamfer at the corners, because the strip line assembly 1 is disconnected or the characteristic is deteriorated due to friction with the ferrite substrate 5. Etc. can be suppressed.

The size of the ferrite substrate 5 is 0.2 mm to 0.8 mm (preferably 0.3 mm
To 0.6 mm) is preferable from the viewpoint of the characteristic surface strength. For example, when the ferrite substrate 5 is formed in a disc shape,
The diameter is 1.6 mm to 3.5 mm (preferably 2.5 mm
To 2.9 mm) is preferable from the viewpoint of miniaturization and characteristics.

By subjecting both main surfaces of the ferrite substrate 5 to a polishing process or the like, it is possible to form the ferrite substrate 5 to a predetermined thickness or to suppress variations in characteristics.

Next, the magnet 6 will be described.

The magnet 6 preferably has a magnetic force enough to apply a magnetic field to the ferrite substrate 5, and a particularly preferable material is Sr-based ferrite.

Further, the size of the magnet 6 is preferably larger than that of the ferrite substrate 5, and more preferably, the ferrite substrate 5 is accommodated within the projected area of the magnet 6. It is particularly preferable that the magnetic field is uniformly applied to the ferrite substrate 5 so that the center of the magnet 6 and the center of the ferrite substrate 5 coincide with each other.

The specific shape of the magnet 6 can be a disk shape, a square plate shape, an elliptical plate shape, a polygonal plate shape, or the like. In particular, the ferrite substrate 5 is a disk shape. In this case, a rectangular plate is preferable because a uniform magnetic field can be applied to the ferrite substrate 5 and positioning can be easily performed.

The thickness of the magnet 6 ranges from 0.3 mm to 1.0 mm.
5 mm is preferable from the standpoint of thickness reduction and the strength of the magnetic field.

Next, the lower case 7 will be described.

The lower case 7 is generally made of a metal material having good conductivity, and particularly preferably, a conductive metal substrate containing copper, silver, iron or the like is suitably used. It is preferable that a metal material having good conductivity such as silver or gold is formed to a thickness of 1 μm to 5 μm by plating or the like from the viewpoint of electrical characteristics and bonding with other components.

The insulator 8 provided in the lower case 7 is connected to the hot terminal side of the resistor 17 and the capacitors 9 and 1.
0 is formed in the lower case adjacent to the lower case 7.
The insulator 8 is preferably formed by an adhesive sheet, a non-adhesive sheet, or at least one method of printing.

Next, the capacitors 9, 10, and 11 (hereinafter abbreviated as a capacitor group) will be described.

It is desirable that the dielectric substrate of the capacitor constituting the capacitor group has a dielectric constant of 80 or more.
0 and 11 can be formed thin, and the element can be miniaturized.

The electrodes formed on both surfaces of the dielectric substrate are made of an electrode material selected from at least one of copper, silver and nickel.

The external shape of the capacitor group is preferably rectangular, which is advantageous in terms of mounting surface and positioning. The external shape of the capacitor group may be circular or elliptical.

Next, the terminal base 12 will be described.

The feature of the terminal base 12 is that it is provided so as to surround the ferrite substrate 5 so that the magnet can be fixed as shown in FIG. 1, and the strip line assembly 1 and the capacitors 9, 10, 11 By pressing the joint of the resistor 17 and the joint of the resistor 17, it is possible to reduce the size of the device without requiring a new pressing member for pressing each part. Further, the terminal base 12 has input / output terminals 13 and 14.
By inserting, the size can be further reduced and the production becomes easier.

The terminal base 12 has a structure in which terminals 13 and 14 are provided on a non-conductive material such as resin (epoxy resin, liquid crystal polymer, etc.), ceramics or the like by using insert molding or the like. The terminals 13 and 14 are made of a conductive material such as brass, and it is preferable that the conductive material be plated with both conductors such as silver.

The terminal base 12 is preferably made of a material having heat resistance because it is highly likely that heat will be applied when the terminal base 12 is mounted on another circuit board with a bonding material or the like. Specifically, at least 250 ° C. (preferably 2 ° C.)
(At least 90 ° C.).

The terminal base 12 is, as shown in FIGS.
Terminals 2 a, between capacitors 9, 10 and terminals 13, 14
3a, and is bonded to at least the lower case 7 with an adhesive or fitting. As shown in FIG. 1, a concave portion 7a is provided in the lower case 7 to facilitate positioning of the terminal base 12, and a convex portion 12a that fits into the concave portion 7a is provided in the terminal base 12. I have. Note that the relationship between the protrusion 12a and the recess 7a may be reversed. That is, the terminal base 12 may be provided with a concave portion and the lower case 7 may be provided with a convex portion.

Preferably, the terminal base 12 is not provided with terminals and electrode patterns other than the terminals 13 and 14, so that the terminal base 12 can be further reduced in size and weight.

In the present embodiment, the terminals 13 are inserted into the terminal base 12 made of resin or the like by insert molding or the like.
Although the terminal 14 is provided, the terminals 13 and 14 may be bonded to the terminal base 12 with an adhesive or the like.
A method of fixing the terminals 13 and 14 by mechanically fixing the terminals 13 and 14 by providing a locking portion or the like on the 2 and deforming the negligible portion may be used. In this case, the terminals 13 and 14 may be further securely fixed using an adhesive or the like. Furthermore,
In the present embodiment, the terminals 13 and 14 are formed by bending a plate-like body made of a conductive material such as metal. However, the terminals 13 and 14 are formed on the terminal base 12 by a thin film forming technique such as plating or sputtering. In this case, the terminals 13 and 14 may be formed on the surface of the terminal base 12, or the terminals 13 and 14 may be formed inside the terminal base 12 and a part thereof may be formed. It may be configured to be exposed on the surface of the terminal base 12.

Next, the lower case 7 and the upper case 16 will be described.

The feature of the lower case 7 and the upper case 16 is that the upper case 16 is incorporated in the lower case 7 as shown in FIGS. With this configuration, it is possible to secure an effective area in which each member of the lower case can be mounted without increasing the external dimensions of the element when the element is downsized.

Further, as shown in FIGS.
6. By making at least one of the side walls of the lower case 7 have a spring property by bending or the like, assembling can be facilitated and productivity can be improved.

Further, as shown in FIG. 7, a convex portion is provided at both ends of the side wall of the upper case 16 and a concave portion is provided on the side wall of the lower case 7 so that the convex portion fits into the side wall. It can be made easier and productivity can be improved. The relationship between the concave and convex portions of the upper and lower cases may be reversed.

The lower case 7 is preferably made of a conductive metal material or the like. In the present embodiment, a rolled steel plate is used. In order to further improve the electrical characteristics, a plated film made of a metal material such as silver or copper is formed on a rolled steel sheet by one to one.
It is preferable that the thickness be 5 μm. In addition, the lower case 7 is provided with projections 7b, 7c, 7d, 7e in addition to the recess 7a described above, and the projections 7b to 7e may be used as ground terminals.

The center (not shown) of the strip line assembly 1 is joined to the lower case 7 by at least a conductive joining material or the like.

The lower case 7 has a substantially U-shaped cross section, and has no adjustment window or the like.

The upper case 16 is also made of the same material, and is not provided with an adjusting window or the like.

The case 16 has at least the magnet 6 bonded with a bonding material or housed together with the terminal base 12.

[0062]

According to the present invention, the size of the element can be reduced by incorporating the upper case into the lower case.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a non-reciprocal circuit device according to an embodiment of the present invention.

FIG. 2 is a plan view showing internal components of the non-reciprocal circuit device according to one embodiment of the present invention.

FIG. 3 is an exploded perspective view showing a non-reciprocal circuit device according to one embodiment of the present invention.

FIG. 4 is a sectional view showing a non-reciprocal circuit device according to one embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a non-reciprocal circuit device according to one embodiment of the present invention.

FIG. 6 is a sectional view showing the upper and lower cases according to one embodiment of the invention of claim 2;

FIG. 7 is a cross-sectional view showing the upper and lower cases according to one embodiment of the invention of claim 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Strip line assembly 2, 3, 4 Strip line 5 Ferrite board 6 Magnet 7 Lower case 8 Insulator 9, 10, 11 Capacitor 12 Terminal base 13, 14 Terminal 15 Through hole 16 Upper case 17 Resistor 18 Insulator

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Shuichiro Yamaguchi 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. Term (reference) 5J013 EA01

Claims (4)

[Claims] A ferrite substrate, a strip line assembly provided adjacent to the ferrite substrate, a magnet for applying a magnetic field to the ferrite substrate, a capacitor connected to the strip assembly, and the strip line. A non-reciprocal circuit device, comprising: a terminal base connected to an assembly; and an upper and lower case for accommodating the respective members, wherein the upper case is incorporated between opposed side walls of the lower case. 2. The non-reciprocal circuit device according to claim 1, wherein at least a part or the whole of a side wall of the upper and lower cases has a spring property by bending. 3. At least one of the side walls of the upper and lower cases,
2. The non-reciprocal circuit device according to claim 1, wherein processing is performed to facilitate positioning. 4. A lumped constant type isolator, wherein a resistor is connected to at least one strip line of the strip line assembly of the non-reciprocal circuit device according to claim 1.