JP2000349512A - 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 and ease of assembling are realized. SOLUTION: Miniaturization and ease of assembling can be realized by adopting an enclosed configuration of a terminal base 12 joined with a strip line aggregate 1 that encloses a ferrite board and a magnet 6, the configuration of the ferrite board 5 whose side face is folded along an opposite side face, and a configuration of arranging a pressure member to make the strip line aggregate 1 closely contact the ferrite board 5.

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.

Further, with the miniaturization of communication equipment, miniaturization of non-reciprocal circuit elements such as isolators and ease of assembly are required.

[0004]

However, in the above configuration, further miniaturization and ease of assembly are required as described above. For example, if a ferrite substrate or a magnet is miniaturized, the characteristics and constituent materials are reduced. In this respect, there is a problem that the options are extremely narrowed and the design becomes very difficult.

SUMMARY OF THE INVENTION The present invention is simple in design, small in size,
An object of the present invention is to provide a non-reciprocal circuit device and a lumped-constant-type isolator that can be easily assembled.

[0006]

SUMMARY OF THE INVENTION The present invention is directed to an arrangement in which a terminal base joined to a strip line assembly is surrounded by a ferrite substrate and a magnet, and a terminal line is bent along opposing side surfaces of the ferrite. By providing a pressing member for bringing the body into close contact with the ferrite, miniaturization and ease of assembly can be realized.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention according to claim 1, wherein a ferrite substrate, a strip line assembly provided adjacent to the ferrite substrate, a magnet for applying a magnetic field to the ferrite substrate, and the strip assembly And a terminal base connected to the stripline assembly. The terminal base has a surrounding configuration surrounding the ferrite substrate and the magnet, so that the conventional terminal base surrounds only the ferrite substrate. Therefore, the step of mounting the magnet separately and the positioning of the magnet with respect to the ferrite substrate are required. However, since the ferrite substrate and the magnet can be collectively mounted on the terminal base, the terminal can be small and easily assembled.

According to the second aspect of the present invention, according to the first aspect, the terminal base is composed of an insulating base and the terminals provided on the base, so that the configuration is simple, and it is easy to assemble with a small size. .

According to a third aspect of the present invention, in the second aspect, since the base is made of a material having heat resistance, the element becomes small, and even if the base becomes small,
Destruction of the base due to heat during reflow or soldering can be prevented.

According to a fourth aspect of the present invention, in the third aspect, the base is provided with heat resistance of 250 ° C. or more, so that it can be joined to another member using solder or lead-free solder. , The base will not be destroyed.

According to a fifth aspect of the present invention, in the second aspect, the terminal base presses at least one portion of the strip line assembly, so that the element becomes smaller and the shape becomes smaller. Can be prevented from being broken by heat.

According to a sixth aspect of the present invention, in the second aspect, since the terminal is attached to the base by insert molding, the terminal can be securely and easily fixed to the base. It can be difficult to remove, and the reliability can be improved.

According to a seventh aspect of the present invention, in the second aspect, the terminal is adhered to the base using an adhesive material, so that the terminal shape can be easily changed, and if the terminal is defective. However, since they can be separated and bonded, productivity is improved.

According to the eighth aspect of the present invention, in the second aspect, the terminal can be made extremely thin by forming the terminal on the base with a thin film, so that the height of the base can be reduced. In addition, the device can be made thinner.

According to a ninth aspect of the present invention, in the second aspect, a locking portion is provided on the base, and the locking portion is deformed.
By mechanically attaching the terminals, the terminals can be removed, and defective terminals can be easily replaced.

According to a tenth aspect of the present invention, there is provided a ferrite substrate, a strip line assembly provided in proximity to the ferrite substrate, a magnet for applying a magnetic field to the ferrite substrate, and connected to the strip line assembly. Conventionally provided with a capacitor and a terminal base connected to the stripline assembly, extending from a common ground conductor, bending a ferrite side surface, and further bending down along the opposite side surface of the side surface. By increasing the individual length of the strip line assembly, the inductance value can be increased, so that the frequency is reduced. Therefore, it is necessary to reduce the value of the capacitor connected to the strip line assembly. Decreasing the value of the capacitor reduces the facing area and thus the size of the capacitor, so that the size of the nonreciprocal circuit device can be easily reduced.

According to an eleventh aspect of the present invention, in the non-reciprocal circuit device according to any one of the first to tenth aspects, the capacitor and the grounding conductor (the disc portion of the center conductor) are mounted on substantially the same plane. When the ratio of the thickness of the capacitor to the thickness of the ferrite is less than 1, a configuration in which the periphery of the ferrite is surrounded by the terminal base can be easily achieved. Alternatively, the bending length can be increased. By reducing the thickness of the capacitor to preferably 1/3 or less, a large capacitance can be obtained even when the facing area is reduced, and the size can be further reduced.

According to a twelfth aspect of the present invention, there is provided 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 connected to the strip assembly. A strip line assembly comprising a capacitor and a terminal base connected to the strip line assembly, wherein a pressing member for bringing the strip line assembly into close contact with ferrite is provided between the strip line assembly and the magnet. The magnetic ferrite can be brought into close contact with the body ferrite, which leads to an increase in the magnetic filling rate, thereby reducing magnetic loss variations due to variations in adhesion during assembly, and making it easy to assemble. Further close contact can reduce the thickness of the ferrite and strip line assembly, thereby reducing the size.

According to a thirteenth aspect of the present invention, in the non-reciprocal circuit device according to the twelfth aspect, when the strip line assembly is brought into close contact with the ferrite due to the fact that the pressing member is a magnetic material, it is pressed against the ferrite on one side. By greatly increasing the magnetic filling rate by the magnetic material, the diameter of the ferrite can be made smaller than the conventional ferrite diameter, and the size of the nonreciprocal circuit device can be reduced.

According to a fourteenth aspect of the present invention, in the non-reciprocal circuit device according to the twelfth aspect, the pressing member is provided on at least one of the strip line assembly and the magnet or the upper case and the magnet. The strip line assembly can be brought into close contact with the ferrite, and can be made smaller than the conventional ferrite diameter, so that the size of the nonreciprocal circuit device can be reduced.

According to a fifteenth aspect of the present invention, in the nonreciprocal circuit device according to any one of the first to fourteenth aspects, it is possible to reduce the size of the non-reciprocal circuit device by reducing the occupied area in a plane by setting a capacitor. it can.

The invention according to claim 16 is the invention according to claims 1 to 15
By connecting a resistor to at least one strip line of the strip line assembly of the non-reciprocal circuit device according to any one of the above, the lumped-constant type isolator has a conventional terminal base and ferrite substrate which are separated from each other at the time of assembly. Although it was difficult to position the ferrite substrate described above, by surrounding the periphery with a terminal base, the positioning can be simplified and the device can be designed to be compact.

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

In FIG. 1, reference numeral 1 denotes a strip line assembly, and the strip line assembly 1 is composed of 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 stripline 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 on 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, and the terminals 13 and 14 are provided on the terminal base 12.
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 a case opened 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.
In addition, the mounting terminal base 12 surrounds the ferrite substrate 5 wound around the strip line assembly 1 in the through hole 15 of the terminal base 12 so that the terminal is connected to the other electrodes of the capacitors 9, 10, and 11. 2a, 3
a and 4a are joined and fixed to the lower case 7 so as to press down the joint lower part.

The above components and the magnet 6 are connected to the cases 7, 16
And a 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 by forming a metal material such as copper, gold, silver or the like into a sheet 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 constituted by three strip lines 2, 3, and 4, but may be constituted by four or more strip lines.

Furthermore, 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.

Further, in the present embodiment, the strip line assembly 1 is wound around the ferrite substrate 5 and arranged, so that space can be saved. 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 less than 25 μm, 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 disc 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, a predetermined chamfer may be applied to the corners of 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.

Further, both main surfaces of the ferrite substrate 5 may be polished or the like so as to have a predetermined thickness.
Variations in characteristics can be suppressed.

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.
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 properties 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.
It is preferable that the insulating material is constituted 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.

The dielectric constant of the dielectric substrate of the capacitors constituting the capacitor group is preferably 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 square, 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 6 can be fixed as shown in FIG. 1, and the strip line assembly 3 and the capacitors 9, 10, By holding down the joint of the resistor 11 and the joint of the resistor 17, it is possible to reduce the size of the device without requiring a new holding member for holding each part. Further, input / output terminals 13, 1 are connected to the terminal base 12.
By inserting 4, the size can be further reduced, and the production becomes easy.

The terminal base 12 has a structure in which terminals 13 and 14 are provided on a non-conductive material such as a resin (epoxy resin, liquid crystal polymer, etc.), ceramic 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 heat-resistant material 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.).

As shown in FIGS. 3, 4, and 5, the terminal base 12 is provided so as to sandwich the terminals 2a, 3a between the capacitors 9, 10 and the terminals 13, 14, and is bonded to at least the lower case 7. Joined by materials and fittings. In addition, as shown in FIGS.
A concave portion 7a is provided so that positioning of the terminal base 12 can be easily performed. A protrusion 12a that fits into the concave portion 7a is provided on the terminal base 12. The relationship between the protrusion 12a and the recess 7a may be reversed. That is, a configuration in which a concave portion is provided in the terminal base 12 and a projection is provided in the lower case 7 may be employed.

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, 13 are formed by insert molding or the like on the terminal base 12 made of resin 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 case 16 will be described.

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. The lower case 7 has projections 7b, 7c, 7 on the other end in addition to the projection 7a described above.
d and 7e are provided, and the projections 7b to 7e may be used as ground terminals.

The central part (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 case 16 is also made of the same material, and is not provided with an adjustment window or the like.

In the case 16, at least the magnet 6 is bonded with a bonding material or housed together with the terminal base 12.

[0071]

According to the present invention, miniaturization can be realized by adopting a configuration in which a magnet is inserted around a ferrite substrate with a terminal base joined to a strip assembly.

[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.

[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 16 Case 17 Resistor 18 Insulator

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takayuki Takeuchi 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. Terms (reference) 5J013 EA01 FA07 FA08

Claims (16)

[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 the assembly; wherein the terminal base has a surrounding configuration surrounding the ferrite substrate and the magnet. 2. The non-reciprocal circuit device according to claim 1, wherein said terminal base comprises an insulating base and terminals provided on said base. 3. The non-reciprocal circuit device according to claim 2, wherein the terminal base is made of a material having heat resistance. 4. The non-reciprocal circuit device according to claim 3, wherein the terminal base has a heat resistance of 250 ° C. or higher. 5. The non-reciprocal circuit device according to claim 2, wherein the terminal base presses at least one portion of the strip line assembly. 6. The non-reciprocal circuit device according to claim 2, wherein the terminal is attached to the terminal base by insert molding. 7. The non-reciprocal circuit device according to claim 2, wherein the terminal is bonded to the terminal base using an adhesive. 8. The non-reciprocal circuit device according to claim 2, wherein the terminal is formed by a thin film on the terminal base. 9. The non-reciprocal circuit device according to claim 2, wherein a locking portion is provided on the terminal base, and the locking portion is deformed to mechanically mount the terminal. 10. A ferrite substrate, a strip line assembly provided close to the ferrite substrate, a magnet for applying a magnetic field to the ferrite substrate, a capacitor connected to the strip line assembly, and the strip With a terminal base connected to the line aggregate, it is extended from the common ground conductor, the ferrite side is bent,
The non-reciprocal circuit device is further lowered downward along a side surface opposite to the side surface. 11. The nonreciprocal circuit device according to claim 1, wherein the capacitor and the grounding conductor (the disk portion of the center conductor) are mounted on substantially the same plane. A ratio of the thickness of the ferrite to the thickness of the ferrite is less than 1. 12. 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 the aggregate; and a pressing member for bringing the strip line aggregate into close contact with ferrite is provided between the strip line aggregate and the magnet. 13. The non-reciprocal circuit device according to claim 12, wherein the pressing member is a magnetic material. 14. A non-reciprocal circuit device according to claim 12, wherein said pressing member is provided on at least one of a strip line assembly and a magnet or between an upper case and a magnet. element. 15. The method according to claim 1, wherein:
A non-reciprocal circuit device, wherein a capacitor is set up in the non-reciprocal circuit device described in the above. 16. A lumped-constant isolator, characterized in that a resistor is connected to at least one strip line of the strip line assembly of the nonreciprocal circuit device according to any one of claims 1 to 15.