JP3463878B2 - Non-reciprocal circuit device - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a non-reciprocal circuit device.

[0002]

2. Description of the Related Art Generally, non-reciprocal circuit elements such as isolators are used in mobile radio equipment such as mobile phones. Conventionally, this type of non-reciprocal circuit device has been disclosed in JP-A-200
As disclosed in Japanese Patent Laid-Open No. 1-94311, for example, three capacitors, resistors, a magnetic rotor, and the like are housed inside a case having a square outer shape of 5 mm × 5 mm. The magnetic rotor includes three central conductors, each of the central conductors being connected to an electrode of a capacitor and a resistor. Then, the permanent magnet applies a DC magnetic field to the magnetic rotor. The permanent magnet is pressed by the cover, and the cover is joined to the case.

As a means for improving the magnetic efficiency of the permanent magnet with respect to the magnetic flux, the case and the cover are constructed by including a magnetic metal plate, and both form a yoke for the magnetic field generated by the permanent magnet.

However, it has been found that the prior art using a case having a square outer shape has a limitation in improving the insertion loss and the specific bandwidth.

[0005]

An object of the present invention is to provide a non-reciprocal circuit device which contributes to improvement of insertion loss and specific bandwidth.

[0006]

In order to solve the above-mentioned problems, a nonreciprocal circuit device according to the present invention comprises a case member,
It includes a magnetic rotor and a permanent magnet.

The case member includes a bottom plate and first to fourth parts.
And the side wall of. The bottom plate includes a magnetic metal plate and has a rectangular shape as a whole. The first to fourth side walls are erected on four sides of the bottom plate.

The first side wall and the second side wall face each other. The third side wall and the fourth side wall are
It includes magnetic metal sidewalls facing each other and continuous with the magnetic metal plate of the bottom plate.

The magnetic rotor is arranged in a space surrounded by the first to fourth side walls, and the permanent magnet applies a DC magnetic field to the magnetic rotor.

The case member has a vertical outer dimension as viewed in the arrangement direction of the first and second side walls, and a lateral outer dimension as viewed in the arrangement direction of the third and fourth side walls. When, (b / a)> 1 is satisfied.

As described above, in the nonreciprocal circuit device according to the present invention, the case member includes the bottom plate and the first to fourth side walls. The bottom plate has a square shape as a whole,
Since the first to fourth side walls are erected on four sides of the bottom plate, the magnetic rotor and the permanent magnets are arranged in the space surrounded by the bottom plate and the first to fourth side walls, and A DC magnetic field can be applied to the magnetic rotor by the magnet.

The third side wall and the fourth side wall of the case member include magnetic metal side walls continuous with the magnetic metal plate of the bottom plate.
Therefore, the magnetic metal plate included in the case member constitutes a yoke for the permanent magnet, and the magnetic field generated by the permanent magnet can be efficiently applied to the magnetic rotor.

The case member has a vertical outer dimension a viewed in the direction of the first and second side walls and a lateral outer dimension b viewed in the direction of the third and fourth side walls (b / a)> 1. Meet That is,
The plane shape of the case member according to the present invention is rectangular, unlike the conventional square shape. It has been found that this rectangular case member can improve both the insertion loss and the specific bandwidth.

When (b / a)> 1 is satisfied for the vertical outside dimension a and the lateral outside dimension b of the case member, the case member has a rectangular planar shape. Therefore, when the magnetic rotor having a substantially square planar shape is arranged inside the case member, it is included in the gap between the magnetic metal side wall included in the third side wall and the magnetic rotor and in the fourth side wall. The distance between the magnetic metal side wall and the magnetic rotor is larger than that when the square magnetic rotor having the same plane area is housed in the square case member.

According to the result of the simulation, when the distance between the magnetic rotor and the side wall of the magnetic metal becomes small, the directions of the magnetic fields in the magnetic rotor become uneven, and conversely, when the distance becomes large, the magnetic field in the magnetic rotor becomes larger. I found that the directions were the same.

According to the present invention, the distance between the magnetic rotor and the side wall of the magnetic metal is increased, so that the directions of the magnetic fields in the magnetic rotor are aligned, the insertion loss is reduced, and the specific bandwidth is improved. It is supposed to be. The ratio (b / a) between the vertical outer dimension a and the horizontal outer dimension b is preferably (b / a) ≧ 1.1, more preferably (b / a) ≧ 1.2, and further preferably: b / a) ≧ 1.25.

Other objects, configurations and advantages of the present invention will be described in more detail with reference to the accompanying drawings. The accompanying drawings are merely exemplary.

[0018]

1 is an exploded perspective view of a nonreciprocal circuit device according to the present invention, FIG. 2 is a perspective view of the nonreciprocal circuit device shown in FIG. 1, and FIG. 3 is a line 3-3 of FIG. 4 is a sectional view taken along line 4-4 of FIG. The illustrated non-reciprocal circuit device is an isolator and includes a case member 1,
It includes first to third capacitors C1 to C3, a resistor R, and a magnetic rotor 6. In the illustrated embodiment, a pressing member 7, a permanent magnet 8 and a cover member 9 are further included.

As shown in FIGS. 5 and 6, the case member 1 includes a bottom plate 16 and first to fourth side walls 100 to 400. The bottom plate 16 has a rectangular shape as a whole. Figure 6
In, the shaded area indicates a conductive area or a magnetic metal area. The bottom plate 16 includes a magnetic metal region (magnetic metal plate material) in a wide range. The bottom plate 16 includes conductive high step portions 11 and 13. The conductive high step portions 11 and 13 can be made of a magnetic metal material.

The bottom plate 16 further includes an insulating high step portion 27. The insulating high step portion 27 is installed between the conductive high step portions 11 and 13. The insulating high step portion 27 is made of an insulating material such as engineered plastic and has a conductor film 31 on its surface. The conductor film 31 is a metal film. The height of the insulating high step portion 27 is substantially equal to the height of the conductive high step portions 11 and 13.

The first to fourth side walls 100 to 400 are erected around the bottom plate 16. The first side wall 100 and the second side wall 200 face each other. Third and fourth sidewall 30
0 and 400 are the first side wall 100 and the second side wall 200.
The first side wall 100 and the second side wall 200 are substantially perpendicular to each other and are opposed to each other in a direction orthogonal to the arrangement direction.

Therefore, the case member 1 includes the first side wall 10
0 and the vertical outer dimension b as viewed in the arrangement direction of the second side wall 200,
Also, it becomes a quadrangular shape having a vertical outer dimension a as viewed in the arrangement direction of the third and fourth side walls 300, 400.

The vertical outer dimension a and the horizontal outer dimension b are (b / a)
> 1 is satisfied. That is, the case member 1 has a rectangular planar shape, unlike the conventional square shape. Outer vertical dimension a,
The ratio with the lateral outside dimension b is preferably (b / a) ≧ 1.
1, more preferably (b / a) ≧ 1.2, and further preferably (b / a) ≧ 1.25. The technical relationship between the above-mentioned dimensional relationship and the dimensional ratio (b / a) will be described later in detail with reference to data.

The first to fourth side walls 100 to 400 will be described in more detail with reference to the illustrated embodiment. Most of the first side wall 100 is made of an electrical insulator. Most of the second side wall 200 is also made of an electric insulator. In that sense, the first and second sidewalls 10
0 and 200 can be referred to as insulating side walls 25 and 26.

The third side wall 300 has an insulating side wall portion 28 extending from the first side wall 100. Insulating side wall 28
Is adjacent to the magnetic metal side wall portion 12. The magnetic metal side wall portion 12 is a portion extended from the bottom plate 16.

The fourth side wall 400 has an insulating side wall portion 29 extending from the first side wall 100. Insulating side wall 29
Is adjacent to the magnetic metal side wall portion 14. The magnetic metal side wall portion 14 is a portion extended from the bottom plate 16.

In the illustrated embodiment, the case member 1 is formed by combining a first case member made of a magnetic metal material and a second case member made of an insulating material such as an insulating resin. . The first case member includes the magnetic metal side wall portions 12 and 14 and the bottom plate 16. The second case member includes insulating side wall portions 25, 26, 28, 29.

A first terminal 15 made of metal is provided at a corner portion where the insulating side wall 25 and the insulating side wall 28 are orthogonal to each other. The first terminal 15 is incorporated in the insulating side walls 25 and 28 and is exposed inside the case member 1. First terminal 15
Are exposed inside the case member 1 and extend along the insulating side wall 25.

Similarly, a second terminal 17 made of metal is provided at a corner portion where the insulating side wall 25 and the insulating side wall 29 are orthogonal to each other. The second terminal 17 is incorporated in the insulating side walls 25 and 29, and is exposed inside the case member 1. Second terminal 17
Are exposed inside the case member 1 and extend along the insulating side wall 25.

An insulating high step portion 22 is provided between the conductive high step portion 11 and the first terminal 15, and an insulating high step portion is provided between the step portion 13 and the second terminal 17. A section 24 is provided. The height of the insulating high-step portions 22 and 24 is substantially the same as the height of the conductive high-step portions 11 and 13.

The description will be made again with reference to FIGS. The magnetic rotor 6 includes a soft magnetic substrate 60 and first to third central conductors 64 to 66. The soft magnetic substrate 60 is a flat plate whose planar shape is smaller than the plane area of the bottom plate 16, that is, a substantially square shape, more specifically, a substantially square shape. The soft magnetic substrate 60 is made of a soft magnetic material such as yttrium / iron / garnet (YIG), as is well known.

The first to third central conductors 64 to 66 are the first
-It has 3rd terminal parts 641-661, respectively. First
The third central conductors 64 to 66 are in contact with the lower surface 62 of the soft magnetic substrate 60, and the side surfaces 631 to 63 of the soft magnetic substrate 60.
4 is guided to the upper surface 61. The first to third central conductors 64 to 66 are arranged on the upper surface of the soft magnetic substrate 60 so as to be insulated from each other and intersect at an angle of about 120 degrees.

Specifically, the first central conductor 64 passes through the first side end face 631 of the soft magnetic substrate 60, and the first terminal portion 641 is opposed to the first side end face 631 on the second side. It is led out of the end surface 632. Second central conductor 65
The second terminal portion 651 is led to the outside of the third side end surface 633. In the third central conductor 66, the third terminal portion 661 is led out to the outside of the fourth side end surface 634.

The magnetic rotor 6 includes the first to third terminal portions 64.
1 to 661 are arranged on the bottom plate 16 in the internal space of the case member 1 so as to correspond to the insulating side wall portions 26, 28, 29 of the second to fourth side walls 200 to 400. More specifically, the first terminal portion 641 corresponds to the insulating side wall portion 26 formed by the second side wall 200 itself, and the second terminal portion 651 corresponds to the insulating side wall portion 28 of the third side wall 300. The third terminal portion 661 is arranged on the bottom plate 16 of the case member 1 so as to correspond to the insulating side wall portions 29 of the fourth side walls 100 to 400, respectively. In addition, an intermediate portion of the first central conductor 64 that passes through the first side end surface 631 of the soft magnetic substrate 60 is arranged so as to correspond to the insulating side wall 25 that is configured by the first side wall 100 itself.

FIGS. 7 and 8 are views showing the positional relationship among the magnetic rotor 6, the first to third capacitors C1 to C3, and the resistor R inside the case member 1. As shown in FIG. Referring to these drawings, in the magnetic rotor 6, the first side end face 631 faces the first side wall 100, and the second to fourth side end faces 632 are provided.
To 634 are spaced apart from the second to fourth side walls 200 to 400, respectively, and further the first to third terminal portions 641 to 66.
1 is the insulating side wall portions 26, 28, 29 of the second to fourth side walls
Is arranged inside the case member 1 so as to correspond to.

The first to third capacitors C1 to C3 and the resistor R are the second to second members of the magnetic rotor 6 and the case member 1.
A distance Δa1 generated between the fourth sidewalls 200 and 400,
The insulating side wall portions 26 are arranged by using Δb1 and Δb2.
The first to third terminal portions 64 are portions corresponding to 28 and 29.
1 to 661 are connected. First capacitors C1 to
Since the C3 and the resistor R are chip-shaped and have end electrodes at opposite ends, the first to third terminal portions 641 to 64
Reference numeral 61 denotes the first capacitors C1 to C in the end electrodes.
3 and resistor R.

The first capacitor C1 is mounted along the insulating side wall 28 and the magnetic metal side wall 12. The second capacitor C2 and the resistor R are mounted along the insulating side wall 26. The third capacitor C3 is mounted along the insulating side wall 29 and the magnetic metal side wall 14.

One of the end electrodes of the first capacitor C1 is placed on the insulating high step portion 22. Insulating high step portion 22
Is provided between the conductive high step portion 11 and the first terminal 15. The other of the end electrodes of the first capacitor C1 is placed on the conductive high step portion 11. The conductive high step portion 11 is close to the magnetic metal side wall 12. Since the height of the insulating high-step portion 22 is substantially the same as the height of the conductive high-step portion 11, the first capacitor C1 is placed inside the case member 1 in a planar manner.

One of the end electrodes of the second capacitor C2 is placed on the conductor film 31 on the upper surface of the insulating high step portion 27. The other of the end electrodes of the second capacitor C2 is placed on the conductive high step portion 11. Since the height of the insulating high-step portion 27 is substantially the same as the height of the conductive high-step portion 11, the second capacitor C2 is also placed flat inside the case member 1 and soldered.

One of the end electrodes of the third capacitor C3 is placed on the insulating high step portion 24, and the insulating high step portion 24 is provided between the step portion 13 and the second terminal 17. To be Third
The other end electrode of the capacitor C3 is placed on the step portion 13, and the step portion 13 is close to the magnetic metal side wall 14.
Since the height of the insulating high step portion 24 is substantially equal to the height of the step portion 13, the third capacitor C3 is placed inside the case member 1 in a plane shape and soldered.

One of the end electrodes of the resistor R is placed on the conductor film 31 on the upper surface of the insulating high step portion 27. The other of the end electrodes of the resistor R is placed on the step portion 13. Since the height of the insulating high step portion 27 substantially coincides with the height of the step portion 13, the resistor R is also placed flat inside the case member 1 and soldered.

The first terminal portion 641 of the first central conductor 64
Is the end electrode of the second capacitor C2 and the resistor R
Mounted on top of. An end electrode of the second capacitor C2,
The end electrodes of the resistor R are mounted on the conductor film 31 of the insulating high step portion 27 and soldered.

Second terminal portion 651 of second central conductor 65
Is the first terminal 15 installed inside the case member 1.
And is mounted on the end electrode of the first capacitor C1 in a planar manner.

Third terminal portion 661 of third central conductor 66
Is the second terminal 17 installed on the case member 1 and the third terminal
And the end electrode of the capacitor C3 are mounted in a planar shape.

The height of the conductive high step portion 11 is determined by the case member 1
The height is lower than the height of the first terminal 15 exposed inside.
In other words, the height of the first terminal 15 exposed inside the case member 1 is higher than the height of the conductive high step portion 11.
Similarly, the insulating high-step portion 22 is connected to the conductive high-step portion 11 and the first high-step portion 11.
And the conductive high step portion 1
It has a height approximately equal to one.

Similarly, the height of the step portion 13 is lower than the height of the second terminal 17 exposed inside the case member 1. In other words, the height of the second terminal 17 exposed inside the case member 1 is higher than the height of the step portion 13. Similarly, the insulating high-step portion 24 includes the step portion 13 and the second terminal 1.
7 and the height thereof is substantially equal to the height of the stepped portion 13.

The pressing member 7 has a hollow portion 70 and a frame portion 74, and is provided inside the case member 1. Frame 74
Contacts the first to third terminal portions 641 to 661 and presses them toward the first capacitors C1 to C3 and the end electrodes of the resistor R. The cavity 70 opens at the upper surface 71 and the lower surface 72. The lower surface 72 faces the magnetic rotor 6. The pressing member 7 is mainly used in the first assembly step.
The third terminal portions 641 to 661 are connected to the first capacitor C.
1 to C3 and the end electrodes of the resistor R, the first to third terminal portions 641 to 661 are surely attached to the end electrodes of the first capacitors C1 to C3 and the resistor R. It is used for fixing.

In the illustrated embodiment, the pressing member 7 is U-shaped (or C-shaped), and the hollow portion 70 has a quadrangular shape. The pressing member 7 is made of an insulating material such as engineering plastic.

The permanent magnet 8 is installed inside the cavity 70. The thickness of the permanent magnet 8 does not become larger than the thickness of the pressing member 7. The permanent magnet 8 has a rectangular shape and is installed in the hollow portion 70 of the pressing member 7. The permanent magnet 8 includes an upper surface 81, a lower surface 82 and a side surface 83. The lower surface 82 faces the magnetic rotor 6. The permanent magnet 8 applies a DC magnetic field to the magnetic rotor 6.

The cover member 9 contacts the permanent magnet 8 and is joined to the case member 1 to form a yoke. Cover member 9
Includes an upper surface 91, a lower surface 92 and a side surface 93. As shown in FIGS. 2 to 4, when the case member 1 is connected to the cover member 9, the side surface 93 is connected to the magnetic metal side walls 12 and 14 of the case member 1. Therefore, with respect to the permanent magnet 8, the yoke formed by the cover member 9, the magnetic metal side wall 12 of the case member 1 and the bottom plate 16 of the case member 1, the cover member 9, the magnetic metal side wall 14 of the case member 1 and the case member 1 is provided.
The bottom plate 16 constitutes a yoke.

FIG. 9 is a circuit diagram of the nonreciprocal circuit device according to the present invention. Referring to FIG. 9, the illustrated non-reciprocal circuit device includes first capacitors C1 to C3 and a resistor R, and the first capacitors C1 to C3 and the resistor R are electrically connected to the magnetic rotor 6. ing.

Next, the function and effect of the above nonreciprocal circuit device will be described with reference to FIG. FIG. 10 is a graph showing relational data of the ratio (b / a) of the lateral outer dimension b and the vertical outer dimension a, and the insertion loss (dB) and the specific bandwidth (%). In the figure, the horizontal axis is the ratio of the lateral outer dimension b and the vertical outer dimension a (b / a), the left vertical axis is the insertion loss (dB), and the right horizontal axis is the specific bandwidth (%). is there. The curve L1 shows the insertion loss characteristic, and the curve L2 shows the specific bandwidth characteristic.

This data shows that the soft magnetic substrate 60 constituting the magnetic rotor 6 has a square shape with an outer dimension (l × l), and the magnetic metal side wall 12 and the soft magnetic side wall 12 included in the third side wall 300 are used. Interval Δb between the side end surface 633 of the body 60
1 and the magnetic metal side wall 1 included in the fourth side wall 400
4 and the side end surface 634 of the soft magnetic body 60 are changed, the ratio (b / a) is changed accordingly, and the insertion loss and the specific bandwidth are measured. It is a thing. The intervals Δb1 and Δb2 were made substantially equal. Further, when the ratio (b / a) is 1, the lateral outer dimension b and the vertical outer dimension a are 2l.

As is apparent from FIG. 10, in the region where the ratio (b / a) is smaller than 1, the insertion loss sharply increases and the specific bandwidth sharply deteriorates. According to the simulation, the soft magnetic substrate 60 and the magnetic metal side wall 12,
It was confirmed that when the distances Δb1 and Δb2 from the magnetic field 14 were small, the directions of the magnetic fields in the soft magnetic substrate 60 were uneven. When the intervals Δb1 and Δb2 are small, the insertion loss is increased and the specific bandwidth is narrowed. It is presumed that the directions of the magnetic fields in the soft magnetic substrate 60 are uneven.

On the other hand, in the region where the ratio (b / a) is larger than 1, the insertion loss is reduced and the specific bandwidth is improved. When examined in detail, when (b / a) ≧ 1.1, (b / a)
Compared with a) = 1, the insertion loss is clearly lower,
The bandwidth ratio is also improved. Also, (b / a) ≧ 1.2
Then, the insertion loss becomes 0.28 (dB), which is constant. Further, when (b / a) ≧ 1.25, the specific bandwidth is improved to about 5%. It is presumed that this is because the directions of the magnetic fields in the soft magnetic substrate 60 are aligned in the above range where the ratio (b / a) is larger than 1.

Next, the upper limit of the ratio (b / a) will be described with reference to FIGS. 11 and 12. FIG. 11 is a diagram illustrating a method of obtaining the upper limit value of the ratio (b / a) in the case where a square magnetic rotor is arranged on a square case member. First, FIG. 11A shows a plane area S = L × L.
The figure shows a state in which a square magnetic rotor 6 having a vertical dimension α and a horizontal dimension β is arranged inside a case member 1 having a square shape. Here, α> β.

FIG. 11B shows a case where the longitudinal direction of the magnetic rotor 6 (direction giving the dimension α) is aligned with the longitudinal direction of the case member 1. In this arrangement, the minimum value of the vertical dimension a of the case member 1 is determined by the vertical dimension α of the magnetic rotor 6.

In the arrangement of FIG. 11 (b), FIG.
The vertical dimension a of the case member 1 is changed to the vertical dimension α of the magnetic rotor 6 without changing the plane area S (= L ² ) shown in (a).
The ratio (b / a) becomes maximum when the minimum value is set to match.

In FIG. 11B, the longitudinal dimension α of the magnetic rotor 6 is α = a (1). Since the plane area S is the same as that in the case of FIG. 11A, S = bα (2). When the ratio (b / a) is calculated from the above two formulas, (b / a) = S / α ² (3), and this formula (3) gives the maximum value of the ratio (b / a).

FIG. 11C shows a case where the lateral direction of the magnetic rotor 6 (direction giving the dimension β) is aligned with the longitudinal direction of the case member 1. In this arrangement, the minimum possible value of the vertical dimension a of the case member 1 is given by the lateral dimension β of the magnetic rotor 6.

In the arrangement of FIG. 11 (c), FIG.
The vertical dimension a of the case member 1 is changed to the lateral dimension β of the magnetic rotor 6 without changing the plane area S (= L ² ) shown in (a).
The ratio (b / a) becomes maximum when the minimum value is set to match. In FIG. 11B, the lateral dimension β of the magnetic rotor 6 is β = a (4). Since the plane area S is the same as the case of FIG. 11A, S = bβ (5). When the ratio (b / a) is calculated from the above two equations, (b / a) = S / β ² (6), and this equation (6) gives the maximum value of the ratio (b / a).

In summary, when the square magnetic rotor 6 having the vertical dimension α and the horizontal dimension β is arranged on the square case member 1 having the flat area S, the upper limit of the ratio (b / a) is obtained. The value is given by (b / a) ≦ S / α ² or (b / a) ≦ S / β ² .

FIG. 12 is a diagram for explaining a method of obtaining the upper limit value of the ratio (b / a) in the case where a disk-shaped magnetic rotor is arranged inside a rectangular case member.
First, FIG. 12A shows a state in which a disk-shaped magnetic rotor 6 having a diameter D is arranged inside a case member 1 having a square shape with a plane area S = L × L.

FIG. 12B shows a case where the vertical dimension a of the case member 1 is matched with the diameter D of the magnetic rotor 6. In this arrangement, the minimum value of the vertical dimension a of the case member 1 is determined by the diameter D of the magnetic rotor 6.

In the arrangement of FIG. 12 (b), FIG.
When the vertical dimension a of the case member 1 is set to the minimum value that matches the diameter D of the magnetic rotor 6 without changing the plane area S (= L ² ) shown in (a), the ratio (b / a) is the maximum.

In FIG. 12B, the diameter D of the magnetic rotor 6 is D = a (7). Since the plane area S is the same as the case of FIG. 10A, S = bD (8) When the ratio (b / a) is calculated from the above two equations, (b / a) = S / D ² (9), and this equation (9) gives the maximum value of the ratio (b / a).

Therefore, when the disk-shaped magnetic rotor 6 having the diameter D is arranged on the rectangular case member 1 having the flat area S, the upper limit of the ratio (b / a) is (b / a) ≤S. / D ² .

Next, the operation and effect of another structure of the embodiment shown in FIGS. 1 to 9 will be described. The magnetic rotor 6 is arranged on the bottom plate 16 inside the case member 1. In the case member 1, the bottom plate 16 has a quadrangular shape as a whole, and the first to fourth side walls 100 to 4 are provided around the bottom plate 16.
00 is erected. Soft magnetic substrate 60 of magnetic rotor 6
Is a substantially quadrangular flat plate whose planar shape is smaller than the plane area of the bottom plate 16.

Therefore, when the magnetic rotor 6 is arranged inside the case member 1, the magnetic rotor 6 and the first member of the case member 1 are
~ The case member 1 is provided between the fourth side wall 100 and 400.
There is a gap due to the difference in planar shape between the bottom plate 16 and the soft magnetic substrate 60 of the magnetic rotor 6.

The first to third capacitors C1 to C3 and the resistor R are the second to second magnetic rotators 6 and the case member 1, respectively.
A distance Δa1 generated between the fourth sidewalls 200 and 400,
It is arranged within Δb1 and Δb2 (see FIG. 8 and the like).
According to this arrangement, the magnetic rotor 6 and the second member of the case member 1 are
~ Space Δa generated between the fourth side wall 200 and 400
By effectively using 1, Δb1 and Δb2, the magnetic rotor 6,
The first to third capacitors C1 to C3 and the resistor R can be arranged at a high density with the dead space minimized.

Moreover, in the case member 1, the bottom plate 16 has a rectangular shape as a whole, and the soft magnetic substrate 60 of the magnetic rotor 6 is used.
In addition, since the planar shape is substantially quadrangular, the intervals Δa1, Δb1, and Δb2 generated between the magnetic rotor 6 and the second to fourth side walls 200 to 400 of the case member 1 are the first to the first. The third capacitor C1 to C3 and the resistor R have a shape that can well correspond to a generally square shape that is generally adopted.
Therefore, the first to third capacitors C1 to C3 and the resistor R can be arranged at high density with the dead space minimized.

Further, the first to fourth side walls 1 of the case member 1
00 to 400 includes insulating side wall portions 25, 26, 28, 29, and the magnetic rotor 6 has first to third central conductors 64 to 6.
Sixth first to third terminal portions 641 to 661 are second to fourth
Are arranged on the bottom plate 16 inside the case member 1 so as to correspond to the insulating side walls of the side walls 200 to 400. Therefore, when the magnetic rotor 6 is inserted into the case member 1, the first to third terminal portions 641 to 661 of the first to third central conductors 64 to 66 are normally dropped to the ground potential. The conductive portion of the member 1, for example, the magnetic metal side walls 12, 14 and the like can be electrically and reliably insulated.
The same applies to the relationship with the cover member 9.

The first to third capacitors C1 to C3 and the resistor R are portions corresponding to the insulating side wall portions 26, 28 and 29, and are the first to third central conductors 64 to 66. It is connected to the third terminal portions 641 to 661. Therefore, the first to third capacitors C1 to C3 required as non-reciprocal circuit elements
The first to third center conductors 64 to 66 of the first to third center conductors 64 to 66 are C3 and the resistor R electrically insulated from the conductive portion of the case member 1 which is grounded. It can be connected to the terminal portions 641 to 661.

As long as the case member 1 has the insulating side wall portions 25, 26, 28, and 29 at the necessary places, the other portions may have conductivity. Since the case member 1 normally forms a yoke in combination with the cover member 9, the conductive portion is formed as a magnetic metal portion. The bottom plate 16, the magnetic metal side walls 12, 14 and the like correspond to this conductive magnetic metal portion.

The intermediate portion of the first central conductor 64 passing through the first side end face 631 of the soft magnetic substrate 60 is the first
Of the soft magnetic substrate 60, the first side end face 631 of the soft magnetic substrate 60 is closely attached to the insulating side wall 25 of the first side wall 100 itself. Therefore, the inner volume of the case member 1 can be minimized.

According to the embodiment described above, the magnetic rotor 6,
Since the first to third capacitors C1 to C3 and the resistor R can be arranged in a high density with the dead space minimized, a non-reciprocal circuit device having a minimized shape and thickness can be obtained.

Further, in the case of the embodiment, the pressing member 7 includes the hollow portion 70, the hollow portion 70 is opened at the upper surface 71 and the lower surface 72, and faces the magnetic rotor 6. Permanent magnet 8
Is provided in the cavity 70. The thickness of the permanent magnet 8 is smaller than the thickness of the pressing member 7. According to this structure, even if the thickness of the permanent magnet 8 changes, the total thickness of the nonreciprocal circuit device does not change.

[0078]

As described above, according to the present invention, it is possible to provide a non-reciprocal circuit device that contributes to improvement of insertion loss and specific bandwidth.

[Brief description of drawings]

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

FIG. 2 is a perspective view of the non-reciprocal circuit device shown in FIG.

3 is a sectional view taken along line 3-3 of FIG.

4 is a cross-sectional view taken along line 4-4 of FIG.

FIG. 5 is a perspective view of a case member of the non-reciprocal circuit device according to the present invention.

6 is an enlarged plan view of the case member shown in FIG.

FIG. 7 is a perspective view showing an arrangement relationship of a magnetic rotor, a capacitor, and a resistor inside a case member of the nonreciprocal circuit device according to the present invention.

8 is an enlarged plan view of the arrangement shown in FIG.

FIG. 9 is an electric circuit diagram of a non-reciprocal circuit device according to the present invention.

FIG. 10 is a ratio (b / a) of a lateral outer dimension b and a vertical outer dimension a.
FIG. 3 is a graph showing relational data of the insertion loss (dB) and the specific bandwidth (%).

FIG. 11 is a diagram illustrating a method of obtaining an upper limit value of a ratio (b / a) when a square magnetic rotor is arranged in a square case member.

FIG. 12 is a diagram illustrating a method for obtaining an upper limit value of a ratio (b / a) in the case where a disk-shaped magnetic rotor is arranged inside a rectangular case member.

[Explanation of symbols]

1 Case member C1 to C3 capacitors R resistor 6 Magnetic rotor 64-66 center conductor 641-661 Terminal part 8 permanent magnets 9 Cover member

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H01P 1/36 H01P 1/383

Claims (6)

(57) [Claims] 1. A non-reciprocal circuit device including a case member, a magnetic rotor, and a permanent magnet, wherein the case member includes a bottom plate and first to fourth side walls. Includes a magnetic metal plate and has a quadrangular shape as a whole, the first to fourth side walls are erected on four sides of the bottom plate, and the first side wall and the second side wall are Facing each other, the third side wall and the fourth side wall face each other,
A yoke that is continuous with the magnetic metal plate of the bottom plate is formed.
The magnetic rotor has a planar outer shape of a substantially square shape and is arranged in a space surrounded by the first to fourth sidewalls. A DC magnetic field is applied to the magnetic rotor, and the case member has a vertical outer dimension as a when viewed in the arrangement direction of the first and second side walls, and an arrangement direction of the third and fourth side walls. (B / a)> 1, where the lateral outer dimension as viewed in (1) satisfies b, and the shape of the magnetic rotor is that of the first and second side walls.
The distance is small and the distance to the third and fourth side walls is large.
In addition, the materials of the first and second sidewalls are made of the magnetic material forming the yoke.
Non-reciprocal circuit element that does not contain a reactive metal . 2. A non-reciprocal circuit device including a case member, a magnetic rotor, and a permanent magnet, wherein the case member includes a bottom plate and first to fourth side walls. Includes a magnetic metal plate and has a quadrangular shape as a whole, the first to fourth side walls are erected on four sides of the bottom plate, and the first side wall and the second side wall are Facing each other, the third side wall and the fourth side wall face each other,
A yoke that is continuous with the magnetic metal plate of the bottom plate is formed.
The magnetic rotator has a planar outer shape of a substantially circular shape and is arranged in a space surrounded by the first to fourth side walls. A DC magnetic field is applied to the magnetic rotor, and the case member has a vertical outer dimension as a when viewed in the arrangement direction of the first and second side walls, and an arrangement direction of the third and fourth side walls. (B / a)> 1, where the lateral outer dimension as viewed in (1) satisfies b, and the shape of the magnetic rotor is that of the first and second side walls.
The distance is small and the distance to the third and fourth side walls is large.
In addition, the materials of the first and second sidewalls are made of the magnetic material forming the yoke.
Non-reciprocal circuit element that does not contain a reactive metal . 3. A non-reciprocal circuit element according to claim 1 or 2, non-reciprocal circuit device which satisfies the (b / a) ≧ 1.1. 4. A non-reciprocal circuit element according to claim 1 or 2, non-reciprocal circuit device which satisfies the (b / a) ≧ 1.2. 5. A non-reciprocal circuit element according to claim 1 or 2, non-reciprocal circuit device which satisfies the (b / a) ≧ 1.25. 6. The non-reciprocal circuit device according to claim 1, further comprising a plurality of capacitors and a resistor, wherein the capacitor and the resistor are A nonreciprocal circuit device that is disposed adjacent to the magnetic rotor and is connected to a central conductor provided in the magnetic rotor within a space generated between the magnetic rotor and the side wall of the case member.