JP2001196810A - Concentrated constant type isolator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small concentrated constant type isolator which realizes a small size and passing characteristic of a small loss. SOLUTION: In the case of supposing the side of a terminating resistance to be the first quadrant (the positive area of a Y-axis) and the second quadrant (the positive area of the Y-axis) in rectangular coordinate, where the center of a ferrite plate is set to be an origin and the center line of the whole strip line is set to be a Y-axis, at least 80% of the area of at least one matching capacitor added to the strip line in parallel exists in the third quadrant or the fourth quadrant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lumped constant type isolator used for mobile communication equipment such as a mobile phone and a mobile phone mainly used in a microwave band.

[0002]

2. Description of the Related Art Lumped-constant isolators have been used in mobile communication equipment terminals for a short period of time because of their small size. The isolator is disposed between the power amplifier and the antenna in the transmission stage of the mobile communication device, and is used for the purpose of preventing backflow of an unnecessary signal to the power amplifier, stabilizing the impedance on the load side of the power amplifier, and the like. . With the rapid miniaturization of recent mobile communication devices,
There is a strong demand for miniaturization of the isolator itself and low loss for suppressing battery consumption.

The general configuration of a lumped-constant isolator widely used in terminals such as mobile phones at present is briefly described with reference to FIGS. Three sets of strip lines 4a, 4b, 4c, which are electrically insulated and cross at an angle of about 120 degrees, are arranged close to the ferrite plate 5, and the magnet 2 for magnetizing the ferrite faces the ferrite. Placed. The strip lines 4a, 4b, 4c have capacitors 8a, 8
b, 8c are added in parallel to form strip lines 4a, 4c.
b is connected to the input / output terminals 3a and 3b, and the strip line 4c is connected to the terminating resistor 7. The other end of each strip line is connected to a common grounding disk, and the grounding disk is connected to the three capacitors 8a, 8a.
b, 8c and the ground electrode of the resistor 7 are electrically connected to the lower case 9. Further, together with the lower case 9,
The upper cover 1 including the ferrite plate 5 and the magnet 2 and constituting a part of a magnetic circuit was configured as shown in the figure.

[0004]

With the recent demand for miniaturization and low loss of the isolator, it has become necessary to reduce the pass loss in the entire use band, that is, to widen the pass characteristic. However, in the conventional miniaturization configuration, the miniaturization reduces the insertion loss by 0.1 dB to 0.2 dB in the insertion loss as compared with the isolator having the conventional shape. Conversion was limited.

SUMMARY OF THE INVENTION An object of the present invention is to provide a compact lumped-constant isolator that achieves a low-loss transmission characteristic as compared with a conventional compact lumped-constant isolator. I do.

[0006]

SUMMARY OF THE INVENTION The present invention provides a magnetic substrate and first, second, and third strip lines, which are insulated from each other and intersect at a predetermined angle, on a main surface of the substrate. A magnet for applying a magnetic field to the substrate, first, second, and third capacitors connected to the first, second, and third strip lines, respectively, and connected to the third strip line. A terminating resistor; and a case for accommodating each of the constituent members.
Assuming an imaginary line orthogonal to a center line along the longitudinal direction of the strip line and passing through the center of the substrate, a first region is provided on one side of the imaginary line in the case, and the first region is provided. A second region is provided on the other side of the virtual line, the third capacitor and the terminating resistor are arranged in the first region, and at least a part of the first and second capacitors is arranged in the second region. And the first and second capacitors are arranged so that at least 80% of the area of the main surface of at least one of the first capacitor and the second capacitor is present in the second region.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is directed to a magnetic substrate and first, second and third strip lines which are insulated from each other on the main surface of the substrate and intersect at a predetermined angle. And a magnet for applying a magnetic field to the substrate;
A main surface of the substrate, comprising: first, second, and third capacitors respectively connected to the third strip line, a terminating resistor connected to the third strip line, and a case for housing each component; Assuming an imaginary line that is orthogonal to the center line along the longitudinal direction of the third strip line and passes through the center of the substrate, a first region is provided on one side of the imaginary line in the case and the first region is provided. A second region is provided on the other side of the imaginary line, a third capacitor and a terminating resistor are arranged in the first region, and at least a part of the first and second capacitors is arranged in the second region; Moreover, since the first and second capacitors are arranged such that at least 80% of the area of the main surface of at least one of the first capacitor and the second capacitor is present in the second region, the size of the isolator can be reduced. Special Preventing increase of insertion loss, an effect that it is possible to maintain the low-loss pass characteristics of the isolator.

According to a second aspect of the present invention, in the first aspect, the third strip line is constituted by arranging a pair of conductors in parallel, and the third strip line is connected to each of the first and second strip lines. Since the crossing angle is 70 degrees or more and less than 120 degrees, the passing loss around the center frequency is flatter (the ripple in the band is smaller) as compared with the conventional technology. Is also advantageous.

According to a third aspect of the present invention, in the first aspect, an intersection angle between a virtual line in the longitudinal direction of the first capacitor and a virtual line in the longitudinal direction of the first strip line, and a longitudinal direction of the second capacitor. And the intersection angle between the imaginary line in the longitudinal direction of the second strip line and the imaginary line in the longitudinal direction of the third capacitor and the imaginary line in the longitudinal direction of the third strip line are each 30 ° or more. When the angle is in the range of 150 °, an increase in the insertion loss of the pass characteristic due to the miniaturization of the isolator can be prevented, and the effect of keeping the loss of the pass characteristic of the isolator low can be maintained.

According to a fourth aspect of the present invention, in the first aspect, the first, second, and third capacitors are parallel plate type capacitors. And has the effect that the thickness in the thickness direction can be further reduced in terms of miniaturization of the isolator.

According to a fifth aspect of the present invention, in the first aspect, at least one of the electrode layers of the first, second, and third capacitors is formed by plating, so that the electrode thickness can be accurately determined. Because of the restriction, the accuracy of the joining position between the matching capacitor and the strip line can be improved when the isolator is assembled, and the thickness of the electrode can be reduced, so that the entire isolator can be kept thin.

According to a sixth aspect of the present invention, in the first aspect, at least one of the outermost layers of the electrodes of the first, second and third capacitors is a layer made of solder, so that the outermost layer of the electrodes is made of solder. With this, it is possible to assemble without supplying solder at the time of assembling and without generating solder balls, and it is possible to suppress a problem due to proximity between respective members due to downsizing, and to easily perform downsizing. Has an action.

According to a seventh aspect of the present invention, in the first aspect, the first, second, and third strip lines are bent on the side surface of the substrate, and further bent along the side surface facing the side surface on the substrate. This has the effect of increasing the magnetic filling factor as much as possible and preventing an increase in the insertion loss of the isolator when the size is reduced.

According to an eighth aspect of the present invention, in the first aspect, the substrate is formed in a disk shape, and each portion of the first, second, and third strip lines extending from the ground conductor portion is defined by the circumference of the substrate. Assuming a tangent at the crossing point, the first, second, and third capacitors are parallel to the tangent, thereby preventing an increase in insertion loss of the pass characteristic due to downsizing of the isolator, and improving the pass characteristic of the isolator. It has the effect that low loss can be maintained.

According to a ninth aspect of the present invention, in the first to eighth aspects, the ground conductor portions of the first, second, and second capacitors and the first, second, and third strip lines are substantially on the same plane. Since the ratio of the thickness of each of the first, second, and third capacitors to the thickness of the substrate (the thickness of the capacitor divided by the thickness of the substrate) is less than 1, the insertion of the pass characteristic due to the miniaturization of the isolator. This has the effect of preventing an increase in the loss and keeping the loss of the passing characteristic of the isolator low.

According to a tenth aspect of the present invention, according to the first to ninth aspects, the color of the magnet for applying a DC magnetic field to the substrate is black, so that the magnet is inserted into the upper case as the size of the isolator is reduced. The gap between the magnet and the upper case is close to each other, making positioning difficult.However, the color of the magnet is black, and the color of the upper case is whitish silver due to silver plating. Has the effect that the upper case and the magnet can be more easily positioned when the size is reduced.

According to an eleventh aspect of the present invention, in the first aspect, a terminal base having an input / output terminal is further housed in a case, and the terminal base is provided on the outer periphery of the substrate and the first, second, and third strip lines. By providing a projection that fixes the intersection angle of the center conductor inside the enclosure, the terminal base has the effect of suppressing the variation in the intersection angle of the strip lines, It is possible to simplify the assembly process and reduce the variation in the characteristics of the isolator.

According to a twelfth aspect of the present invention, in the eleventh aspect, a pair of cases is provided, the components are stored by combining the cases, and a concave portion is provided in a side surface portion of the terminal base to be provided in one of the cases. By fitting the raised portion of the terminal into the recess, positioning of the terminal base is facilitated, and the space can be saved, which is advantageous for miniaturization of the isolator.

According to a thirteenth aspect of the present invention, in the first aspect, at a portion where the first, second, and third strip lines are respectively connected to the first, second, and third capacitors,
By having a wedge-shaped slit in at least one of the joining portions of the first, second, and third strip lines, the flow of the joining material is improved, and the joining strength is improved. It has the effect of reducing bonding defects that occur when bonding is performed using solder or the like.

According to a fourteenth aspect of the present invention, there is provided a substrate having magnetism, first, second, and third strip lines insulated from each other on the main surface of the substrate and intersecting at a predetermined angle. A magnet for applying a magnetic field, first, second, and third capacitors respectively connected to the first, second, and third strip lines, and a terminating resistor connected to the third strip line; And a case for storing members,
The first capacitor and the second capacitor are shaped so that the longitudinal direction exists, and the first capacitor and the second
And third along the longitudinal direction of each of the capacitors
Of the first capacitor and the second capacitor so that the imaginary lines of
By arranging the capacitor in the case, it is possible to prevent the insertion loss of the pass characteristic due to the downsizing of the isolator from increasing, and to maintain the low loss of the pass characteristic of the isolator.

A lumped-constant isolator will be described below with reference to FIGS.

First, the strip lines 4a, 4b, 4c
To cover the ferrite plate 5 so that the ground conductor portion of the strip line contacts the lower case 9. Each strip line is electrically insulated by an insulating sheet 6.

The lower case 9 is mounted so that one electrode of the matching capacitors 8a, 8b and 8c is joined, and the terminating resistor 7 is also mounted so that one electrode is joined.

The mounting position of the matching capacitors 8a, 8b, 8c is such that a set of strip lines 4c extended from the terminating resistor 7 is arranged with at least two strip lines arranged in parallel. And the terminating resistor side as the first quadrant and the second quadrant in orthogonal coordinates with the center of the origin as the origin and the center line of the entire strip line 4c as the Y axis, at least 80% of the area of at least one matching capacitor. It is preferable that the mounting be performed in the third quadrant or the fourth quadrant.

At this time, the matching capacitors 8a, 8b, 8
c and the longitudinal center lines and strip lines 4a, 4a
The intersection angle θ10 between the center lines of b and 4c is 30 ° or more.
If the angle is in the range of 150 °, preferably in the range of 70 ° to 110 °, it is advantageous from the viewpoint of miniaturization.

When the ferrite plate 5 has a cylindrical shape, a tangent line 12 is assumed at a point where each of the three sets of strip lines extending from the ground conductor portion intersects the circumference of the ferrite plate 5. The matching capacitors 8a,
More preferably, 8b and 8c are parallel to this tangent.

On the electrodes of the matching capacitors 8a, 8b, 8c, a terminal 4 provided at the end of the strip line is provided.
d, 4e, and 4f are respectively joined, and of the terminal portion 4f, both the terminating resistor 7 and the electrode of the matching capacitor 8c are joined.

The input / output terminals 3 are provided on the terminal portions 4d and 4e of the strip lines 4a and 4b to which the terminating resistor 7 is not connected.
a and 3b are joined. The input / output terminals 3a and 3b are integrally formed with the terminal base 3, and the terminal base 3
Are the terminals 4d, 4e, 4f and the matching capacitors 8a,
8b and 8c are arranged so as to press down the joint.

A lumped constant type isolator is assembled by fixing the magnet 2 for applying a DC magnetic field to the ferrite plate 5 to the upper cover 1 and combining it with the lower case 9 to which the terminal base 3 is joined.

Hereinafter, each component will be described in detail.

First, the strip lines 4a, 4b, 4c
Will be described.

As shown in FIGS. 2 and 3, each of the strip lines 4a, 4b and 4c is composed of a pair of conductors provided in parallel. Further, the intersection angle between a pair of conductors forming the strip line 4c extended from the terminating resistor 7 and the strip lines 4a and 4b is set to be 70 degrees or more and less than 120 degrees, and the strip lines 4c are respectively stripped. By configuring the center line of the line not to be parallel to the center line of the entire strip line 4c, the in-band pass characteristics of the isolator are improved. As a specific configuration, as shown in FIG. 2 and the like, there is a configuration in which the distance between a pair of conductors forming the strip line 4c is not fixed and a wide portion is provided.

Further, by providing slits in the terminal portions 4d, 4e and 4f, the flow of the bonding material such as solder is improved, the bonding strength is improved, and the effect of reducing the bonding failure can be obtained. In the present embodiment, the slit shape is a semicircular cut, but may be formed in another shape.

The strip lines 4a, 4b, 4c are
It is preferable to form a metal material such as copper, gold, silver or the like into a sheet having a predetermined shape. In particular, it is preferable to use copper, a copper alloy, or a copper to which a predetermined amount of an additive is added, to obtain electrical characteristics and workability. , It becomes very advantageous in each aspect of cost.

In the present embodiment, three sets of strip lines 4a, 4b, and 4c are used, but four or more sets of strip lines may be used.

In FIGS. 4 and 5, the strip lines 4a, 4b and 4c are not shown, but are formed integrally with each other at a ground conductor portion to form a substantially Y-shape. 4a, 4b, and 4c may be formed separately.

In FIGS. 4 and 5, when the strip lines 4a, 4b, 4c are wound around the ferrite plate 5, the strip lines 4a, 4b, 4c extending from the ground conductor are connected to the ferrite plate 5. It is preferable to bend along the side surface, and further to be bent along the side surface opposite to the side surface on the same ferrite plate 5. With this configuration, the magnetic filling factor can be increased as much as possible, and an increase in insertion loss of the isolator due to miniaturization can be prevented.

The strip lines 4a, 4b, 4c
An insulating sheet 6 is provided between them, and is electrically insulated.

Further, specifically, the strip line 4
a, 4b, and 4c are rolled copper foils (25 μm to 60 μm).
m) is preferably used, and when it is 25 μm or less,
Breakage and the like are likely to occur, and productivity and the like will deteriorate.
If it is 0 μm or more, it is not suitable for a thin type. Further, it is preferable that a thin film composed of at least one kind of conductive metal material such as silver or gold is plated on the rolled copper foil with a thickness of 1 μm to 5 μm. Can be improved, and the characteristics can be improved.

Next, the ferrite plate 5 will be described.

The ferrite plate 5 can have a disk shape, a square plate shape, an elliptic plate shape, a polygonal plate shape, or the like. It is preferable that the ferrite plate 5 be a disk shape from the viewpoint of characteristics and the like.

The ferrite plate 5 is preferably made of a magnetic material containing Fe, Y, Al and the like.

When a strip line is wound around the ferrite plate 5, a predetermined chamfer is applied to the corners to prevent disconnection of the strip line and deterioration of characteristics due to friction with the ferrite plate 5. .

The size of the ferrite plate 5 is 0.2 mm to 0.8 mm (preferably 0.3 mm to 0.8 mm) in thickness.
0.6 mm) is preferable in view of the characteristic surface strength and is characterized in that it is thicker than the thickness of the matching capacitors 8a, 8b, 8c. For example, when the ferrite plate 5 is formed in a disk shape, the diameter is preferably 1.6 mm to 3.5 mm (preferably 2.5 mm to 2.9 mm) from the viewpoint of miniaturization and characteristics.

Further, both main surfaces of the ferrite plate 5 are formed to a predetermined thickness by polishing or the like.
Variations in characteristics can be suppressed.

Next, the magnet 2 will be described.

It is preferable that the magnet 2 is black because image recognition during assembly is easy. In addition, the ferrite plate 5
It is preferable to have a magnetic force enough to apply a magnetic field to the material, and it is preferable to use Sr-based ferrite as a particularly preferable material.

Further, the size of the magnet 2 is preferably larger than that of the ferrite plate 5, and more preferably, the ferrite plate 5 is accommodated within the projected area of the magnet 2.
It is particularly preferable from the viewpoint of characteristics that the magnetic field is uniformly applied to the ferrite plate 5 so that the center of the magnet 2 coincides with the center of the ferrite plate 5.

The specific shape of the magnet 2 can take a disk shape, a square plate shape, an elliptical plate shape, a polygonal plate shape, or the like. In particular, the ferrite plate 5 is a disk shape. In this case, a rectangular plate shape is preferable because a uniform magnetic field can be applied to the ferrite plate 5 and positioning can be easily performed.

The thickness of the magnet 2 ranges from 0.3 mm to 1.
5 mm is preferable from the standpoint of thickness reduction and the strength of the magnetic field.

In this embodiment, the ferrite plate 5
Although a magnet was used to apply a magnetic field to the device, an electromagnet or the like may be used. By using the electromagnet, a predetermined applied magnetic field can be arbitrarily selected, so that adjustment of characteristics and the like can be easily performed.

Next, the lower case 9 and the upper cover 1 will be described.

The lower case 9 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 lower case 9 includes a portion of the terminating resistor 7 under the electrode on the hot terminal side, and a capacitor 8a,
Lower case side portion 9 in which 8b and 8c are close to lower case 9
a, An insulating film is formed inside the lower case terminal portion 9b. It is preferable that the insulating film is formed by an adhesive sheet, a non-adhesive sheet, or at least one method of printing.

The lower case 9 has strip lines 4a, 4a
The ground conductors b and 4c are joined by at least a conductive joining material or the like. The upper cover 1 is also made of a similar material, and at least a magnet 2 is bonded to the upper cover 1 with a bonding material.

Next, matching capacitors 8a, 8b, 8c
Will be described.

As the matching capacitor, it is preferable to use a parallel plate type capacitor in view of the variation in capacitance and the miniaturization of the isolator, especially the thickness reduction.

The electrodes at this time were copper, silver,
It is composed of an electrode material selected from at least one of nickel.

As a method of forming the electrodes, it is preferable that at least one of the electrode layers is formed by plating, since the electrodes can be formed thinly and uniformly, and the joining position accuracy in assembling the isolator is improved.

Further, if the outermost layer of at least one of the electrodes is formed by plating, it is not necessary to supply solder at the time of assembly, which is preferable.

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

Next, the terminal base 3 will be described.

The terminal base 3 has a through hole, and the ferrite plate 5 is inserted into the through hole to surround the ferrite plate 5 and the strip lines 4a, 4b, 4c. A projection 3c for fixing the strip lines 4a, 4b, 4c at a portion corresponding to the side surface of the ferrite plate 5 is provided inside the enclosure. The projections 3c make it possible to keep the intersection angle of the strip lines 4a, 4b, 4c constant at all times. Further, the deviation of the intersection angle that occurs when the strip lines 4a, 4b, 4c are wound around the ferrite plate 5 can be reduced. The correction can be made simply by fitting the base 3. In the present embodiment, the projections 3c are provided only near the strip lines 4a, 4b, 4c. Conversely, the projections 3c are large enough that the surrounding portion of the terminal base 3 contacts the ferrite plate 5, and the strip lines 4a, 4b , 4c can obtain the same effect even if a concave portion is provided in a portion overlapping with the concave portion.

The feature of the terminal base 3 is that it is provided so as to surround the ferrite plate 5, and the strip lines 4a, 4b,
By holding down the junction between 4c and the matching capacitors 8a, 8b, 8c and the junction with the terminating resistor 7, it is possible to reduce the size of the device without requiring any additional holding member for holding down each part. In addition, input / output terminals 3
By inserting a and 3b, the size can be further reduced and the production becomes easier. Further, by providing the concave portion 3d in which the terminal portion 9b of the lower case is fitted on the side surface of the terminal base 3, the mounting position can be easily understood, and the mounting area of the lower case 9 can be effectively used.

The terminal base 3 has a structure in which input / output terminals 3a and 3b are provided on a non-conductive material such as a resin (epoxy resin, liquid crystal polymer, etc.), ceramics or the like by using insert molding or the like. The input / output terminals 3a and 3b are made of a conductive material such as brass, and it is preferable that the conductive material be plated with a good conductor such as silver.

The terminal base 3 is preferably made of a material having heat resistance because it is highly likely that heat will be applied when the terminal base 3 is mounted on another circuit board with a bonding material or the like. Specifically, at least 250 ° C. (preferably 29 ° C.)
(0 ° C. or higher).

In this embodiment, the input / output terminals 3 are formed on the terminal base 3 made of resin or the like by insert molding or the like.
Although the input / output terminals 3a and 3b are provided, the input / output terminals 3a and 3b may be bonded to the terminal base 3 with an adhesive or the like. Alternatively, a locking portion or the like may be provided on the terminal base 3 and the locking portion may be deformed. A method of mechanically fixing the input / output terminals 3a and 3b may be used.
In this case, it may be further securely fixed using an adhesive or the like. Further, in the present embodiment, the input / output terminals 3a, 3b
Was bent on a plate made of a conductive material such as metal, but the input / output terminals 3a and 3b were formed as thin films on the terminal base 3 by a thin film forming technique such as plating or sputtering. In this case, the input / output terminals 3a and 3b may be formed on the surface of the terminal base 3,
May be configured such that input / output terminals 3 a and 3 b are formed inside thereof and a part thereof is exposed on the surface of the terminal base 3.

FIG. 4 shows an embodiment of the present invention.
This will be described with reference to FIGS. The configuration of the entire isolator other than the shape of the lower case and the position of the matching capacitor was common as shown in FIG. 4 and 5 show an example of the configuration of the isolator according to the embodiment of the present invention.
And ferrite plate 5, strip lines 4a, 4b, 4
c, a terminating resistor 7, and matching portions 8a, 8b, 8c. This part is called a lower case block. In FIGS. 4 and 5, the shape of the lower case is changed from that of the conventional lower case shown in FIGS. 9 and 10 in accordance with the arrangement of the matching capacitor, so that sufficient grounding can be obtained. FIG. 10 shows a conventional lower case block. In FIG. 10, matching capacitors 8a,
8b and 8c show that 20% or more of the area is in the first quadrant and the second quadrant.

As an evaluation of the isolator in the present embodiment, as shown in FIGS. 6A and 6B, the minimum pass loss ILmin in the forward band and the pass loss ILlow in both ends of the band are shown.
And ILhigh, and the maximum isolation Isomax and the isolation Isolow and Isohigh at both ends of the band, which are the pass characteristics in the reverse direction. Table 1 shows that at least 80% or more of the area of at least one of the matching capacitors 8a, 8b, 8c added in parallel to the strip lines 4a, 4b, 4c of the present embodiment is in the third quadrant or the fourth quadrant. The electrical characteristics of the isolator using the configuration diagrams 4 and 5 in the quadrant and the isolator using the conventional technology shown in FIG. 10 are shown. FIGS. 7 (a) and 7 (b) show comparative electric characteristic diagrams at this time.

[0070]

[Table 1]

In the present embodiment, 887 MHz to
Although an isolator operating at 925 MHz (center frequency 906 MHz) was manufactured, the present invention is not limited to this frequency band.

From Table 1 and FIG. 7, it can be seen that the use of the configuration according to the embodiment of the present invention improves the electrical characteristics in the operating frequency band as compared with those of the prior art. By comparing the embodiment and the conventional technology, it is found that at least 80% or more of the area of at least one of the matching capacitors added in parallel to the strip line is in the third quadrant or the fourth quadrant. It is understood that it is preferable to perform

As another perspective, as shown in FIG. 5, the longitudinal direction of the strip line 4c (the
The direction in which c reaches the end of the ferrite plate 5)
A virtual line P2 orthogonal to the center line P1 and passing through the center of the ferrite plate 5 is defined, and all of the terminating resistor 7 and the matching capacitor 8c are arranged in the first region with the virtual line P2 as a boundary. 2 so that the area of the main surface of the matching capacitors 8a and 8b is 80% or more in the region of No. 2
a, 8b may be arranged. FIG. 5 shows an example in which all of the matching capacitors 8a and 8b are present in the second region. In the conventional technique shown in FIG. 10, the area S1 of the main surface of each of the matching capacitors 8a and 8b existing in the first region is about 30 times the area of the entire main surface of each of the matching capacitors 8a and 8b.
%, And S2 existing in the second region is about 70% of the area of the entire main surface of each of the matching capacitors 8a and 8b. In such a configuration, the loss increases and a problem occurs.

The matching capacitor 8 is provided in the second region.
As a configuration in which the area of the main surface of each of a and 8b is 80% or more, as shown in FIG.
By arranging a and 8b on the inverted C-shape, it is easily configured. That is, by arranging the matching capacitors 8a and 8b so as to be non-parallel to each other, the above configuration can be easily achieved.

As shown in FIG. 8, to examine the area and the loss of the main surfaces of the matching capacitors 8a and 8b in which the second region exists, the matching capacitors 8a and 8b have the second shape.
It can be seen that if the area of the main surface existing in the region is less than 80%, the loss is rapidly deteriorated, and if it is more than 80%, a stable low-loss lumped-constant isolator can be obtained.

[0076]

As is apparent from the above description, according to the present invention, it is possible to obtain a compact lumped-constant isolator that realizes a low-loss passing characteristic as compared with a conventional compact lumped-constant isolator. .

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a lumped-constant isolator according to an embodiment of the present invention.

FIG. 2 is a location diagram of strip lines and capacitors of the lumped constant type isolator according to the embodiment of the present invention.

FIG. 3 is a configuration diagram of a strip line of the lumped-constant isolator according to the embodiment of the present invention.

FIG. 4 is a partial plan view of the lumped-constant isolator according to the embodiment of the present invention.

FIG. 5 is a partial plan view of the lumped-constant isolator according to the embodiment of the present invention.

FIG. 6 is a typical electrical characteristic diagram of a lumped constant type isolator.

FIG. 7 is a comparative electrical characteristic diagram of the lumped-constant isolator according to the embodiment of the present invention and a conventional technique.

FIG. 8 is a graph showing a relationship between an area present in a second region and a characteristic in a lumped-constant isolator capacitor according to an embodiment of the present invention.

FIG. 9 is an exploded perspective view showing a conventional lumped constant type isolator.

FIG. 10 is a plan view showing a conventional lumped constant type isolator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper cover 2 Magnet 3 Terminal base 3a, 3b I / O terminal 3c Projection 3d Depression 4a, 4b, 4c Stripline 4d, 4e, 4f Terminal 5 Ferrite plate 6 Insulating sheet 7 Terminating resistance 8a, 8b, 8c Matching capacitor 9 Lower case 9a Lower case side surface 9b Lower case terminal (earth terminal) 10 Cross angle θ

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor, Sosan Fujimura 1006, Kazuma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Hiroshi Kono 1006 Kadoma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. F-term (reference) 5J013 EA01 FA00 FA07

Claims (14)

[Claims] 1. A magnetic substrate, a first, a second, and a third strip line insulated from each other on a main surface of the substrate and intersecting at a predetermined angle, and applying a magnetic field to the substrate. A magnet, first, second, and third capacitors respectively connected to the first, second, and third strip lines; a terminating resistor connected to the third strip line; And a virtual line passing through the center of the substrate while being orthogonal to the center line of the main surface of the substrate along the longitudinal direction of the third strip line, and including the virtual line in the case. Providing a first region on one side of the line and providing a second region on the other side of the first virtual line, disposing the third capacitor and the terminating resistor in the first region; The first and second And the first and second capacitors are arranged such that at least 80% of the area of the main surface of at least one of the first capacitor and the second capacitor is present in the second region. A lumped-constant isolator characterized by a capacitor. 2. A third strip line in which a pair of conductors are arranged in parallel, and an intersection angle between the pair of conductors and each of the first and second strip lines is 70 degrees or more and less than 120 degrees. 2. The lumped-constant isolator according to claim 1, wherein: 3. The intersection angle between the virtual line in the longitudinal direction of the first capacitor and the virtual line in the longitudinal direction of the first strip line, and the virtual line in the longitudinal direction of the second capacitor and the longitudinal direction of the second strip line. And the intersection angle of the virtual line in the longitudinal direction of the third capacitor and the intersection angle of the virtual line in the longitudinal direction of the third strip line are each in the range of 30 ° to 150 °. Item 7. A lumped constant type isolator according to Item 1. 4. The lumped constant type isolator according to claim 1, wherein the first, second and third capacitors are parallel plate type capacitors. 5. The lumped-constant isolator according to claim 1, wherein at least one of the electrode layers of each of the first, second, and third capacitors is formed by plating. 6. The lumped-constant isolator according to claim 1, wherein at least one of the outermost layers of the electrodes of the first, second and third capacitors is a layer made of solder. 7. The semiconductor device according to claim 1, wherein the first, second, and third strip lines are bent on a side surface of the substrate, and are further bent on the substrate along a side surface facing the side surface. Lumped constant type isolator. 8. When the substrate is formed in a disk shape and a tangent at a point where each of the first, second, and third strip lines extending from the ground conductor portion intersects the circumference of the substrate is assumed. 2. The lumped-constant isolator according to claim 1, wherein the first, second and third capacitors are parallel to the tangent. 9. The first, second, and second capacitors and ground conductor portions of the first, second, and third strip lines are mounted on substantially the same plane. 9. The lumped-constant isolator according to claim 1, wherein the ratio of the thickness of each of the capacitors to the thickness of the substrate (thickness of the capacitor / thickness of the substrate) is less than 1. 10. The lumped constant type isolator according to claim 1, wherein a color of a magnet for applying a DC magnetic field to the substrate is black. 11. A terminal base having input / output terminals is further housed in a case, and said terminal base is connected to a substrate, first, second, and second terminals.
The lumped-constant isolator according to claim 1, wherein the isolator has a structure surrounding the outer periphery of the third strip line, and a projection for fixing an intersection angle of the center conductor is provided inside the enclosure. . 12. A case is provided, a pair of said cases are combined, each component is accommodated, and a concave portion is provided on a side surface of a terminal base, and a terminal rising portion provided in said one case is formed in said concave portion. The lumped-constant isolator according to claim 11, wherein the isolator is fitted. 13. A portion where the first, second, and third strip lines are connected to the first, second, and third capacitors, respectively, at a portion where the first, second, and third strip lines are connected. 2. The lumped-constant isolator according to claim 1, wherein at least one has a wedge-shaped slit. 14. A magnetic substrate, a first, second, and third strip lines insulated from each other on a main surface of the substrate and intersecting at a predetermined angle, and applying a magnetic field to the substrate. A magnet, first, second, and third capacitors respectively connected to the first, second, and third strip lines; a terminating resistor connected to the third strip line; And a case in which the first capacitor and the second capacitor are shaped so that the longitudinal direction exists, and the first capacitor and the second capacitor are formed along the longitudinal direction of each of the first capacitor and the second capacitor. The first and second imaginary lines are set to be non-parallel to each other.
A lumped-constant isolator, wherein the capacitor and the second capacitor are arranged in a case.