JP2606557Y2 - Non-reciprocal circuit device - Google Patents

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 more particularly, to a non-reciprocal circuit device used as a high-frequency component in a microwave band, for example, an isolator and a circulator.

[0002]

2. Description of the Related Art Generally, isolators and circulators have a function of hardly attenuating in a signal transmission direction and increasing in a reverse direction. It is used in the transmission circuit of communication equipment. Isolators and circulators used in this mobile communication device are small and
Lightweight is required, and for this reason, lumped constant type, which can be made smaller and lighter than distributed constant type, is widely used at present.

FIGS. 7 and 8 show an example of the configuration of a conventional lumped-constant type circulator.
8 is an exploded perspective view of the ferrite assembly in the circulator, and FIG. 8 is an appearance perspective view of the ferrite assembly shown in FIG. 7 in a completed state. In the figure, this conventional circulator uses an electrode called a ferrite assembly type. As shown in FIG. 7, the ferrite assembly type electrode is configured such that, for example, three band-shaped center electrodes 21 to 23 are erected from the outer periphery of the circular ground electrode 20. These three center electrodes 21 to 23 are arranged around the ground electrode 20 at an angular interval of 120 °. Ground electrode 20
A thin disk-shaped ferrite plate 1 is placed on the substrate. Each of the center electrodes 21 to 23 is configured to be bent inward and to intersect at the center of the upper surface of the ferrite plate 1. It should be noted that two insulating sheets 3 are arranged between the respective center electrodes 21 to 23, whereby the respective center electrodes 2
1 to 23 are mutually insulated. In addition, each center electrode 2
The tips of 1 to 23 are connected to input / output ports 51 to 53 via matching circuits 41 to 43 each including a capacitor or the like. Further, a DC magnetic field is applied from the upper surface to the lower surface of the ferrite plate 1.

Next, the operation of the circulator shown in FIG. 8 will be described. When a high-frequency signal is input to the input / output port 51, a high-frequency magnetic field generated around the center electrode 21 is rotated by a predetermined angle due to the DC magnetic field, and is guided to the left center electrode 22 by inductive coupling via the ferrite plate 1. An electric current is generated. Therefore, the high-frequency signal input from the input / output port 51 is transmitted to the input / output port 52 on the left and not transmitted to the input / output port 53 on the right. Similarly, the high-frequency signal input from the input / output port 52 is transmitted to the input / output port 53 on the left side and not transmitted to the input / output port 51 on the right side. Further, the high-frequency signal input from the input / output port 53 is transmitted to the input / output port 51 on the left and not transmitted to the input / output port 52 on the right.

In the circulator shown in FIG. 8, if a terminating resistor R is connected to a matching circuit (for example, the matching circuit 43) instead of any one of the input / output ports (for example, the input / output port 53), the circuit shown in FIG. The circulator shown in FIG. 8 can be used as an isolator. in this case,
The isolator transmits a high-frequency signal only in one direction from the remaining one input / output port (for example, input / output port 51) to the other input / output port (for example, input / output port 52).

FIGS. 10 and 11 are views showing the configuration of a lumped constant type circulator proposed by the applicant of the present invention. FIG. 10 is an exploded perspective view of a ferrite assembly in the circulator, and FIG. FIG. 11 is an external perspective view of a completed state of the ferrite assembly shown in FIG. 10. In the figure, this circulator uses a wound center electrode. As shown in FIG.
Reference numerals 1 to 203 each include a band-shaped electrode bent at the center. These center electrodes 201 to 203
Are wound around the ferrite plate 1 at an interval of 120 °, respectively, and intersect at the center of each of the upper and lower surfaces of the ferrite plate 1. Further, between the center electrodes 201 to 203, two insulating sheets 3 are arranged on the upper surface of the ferrite plate 1, and two insulating sheets 3 are arranged on the lower surface of the ferrite plate 1. Thus, the center electrodes 201 to 203 are insulated from each other. One end of each of the center electrodes 201 to 203 is connected to an input / output port 51 via a matching circuit 41 to 43 including a capacitor or the like.
To 53. Also, the center electrodes 201 to 20
The other ends of 3 are grounded. Furthermore, ferrite plate 1
A DC magnetic field is applied from the upper surface to the lower surface.

Similarly to the circulators shown in FIGS. 7 and 8, the circulator shown in FIGS. 10 and 11 transmits a high-frequency signal input to each of the input / output ports 51 to 53, for example, only to the input / output port on the left side. Works like that.
If a terminating resistor R is connected to the matching circuit 43 instead of, for example, the input / output port 53, the circulator shown in FIG. 11 transmits a high-frequency signal only in one direction from the input / output port 51 to the input / output port 52. It can be used as an isolator.

[0008]

[Problems to be Solved by the Invention] By the way, in order to reduce the size of the nonreciprocal circuit device, not only the ferrite plate but also the
The thickness of the center electrode also needs to be reduced. This is because, even though the ferrite plate 1 is made smaller and thinner, when the center electrodes 21 to 23 having the same thickness as the conventional one are used, as shown in FIG. Electrode 21
This is because the positions of the ferrite plates 1 to 23 are relatively high, and the three-port symmetry as electrical characteristics is deteriorated.

The center electrode of the conventional non-reciprocal circuit device has a thickness of about 0.1 mm, and thus is strong in strength and can maintain its shape even after ferrite assembling. If the thickness of the center electrode becomes thinner (for example, about 30 μm) with the miniaturization of, it is extremely difficult to maintain its shape even after the ferrite assembly is formed,
There is a problem that productivity is deteriorated. In particular, FIG.
The winding type nonreciprocal circuit element shown in FIG.
Since 01 to 203 are prepared alone, it is difficult to maintain the shape and the productivity is poor. If the shape of the center electrode cannot be maintained after the formation of the center electrode, the mounting angle of each center electrode with respect to the ferrite plate 1 is deviated from a predetermined angle (for example, 120 °). However, there is a problem that the characteristic characteristics vary.

[0010] Therefore, an object of the present invention is to provide a non-reciprocal circuit device which has good productivity and does not cause deterioration or variation in electric characteristics due to displacement of a center electrode.

[0011]

According to the first aspect of the present invention,
A non-reciprocal circuit element having an extremely small attenuation in the signal transmission direction and an extremely large attenuation in the reverse direction, and a ferrite plate to which a DC magnetic field is externally applied, at least one of the main surfaces of the ferrite plate, A plurality of band-shaped center electrodes arranged so as to intersect in a direction orthogonal to the DC magnetic field and at a predetermined angular interval, and on each center electrode
Of the center electrode , which is placed and has tackiness or adhesion
A plurality of insulating sheets having an area larger than the intersection are provided, and each center electrode is located at a position directly above it.
Pasted on the main surface of the ferrite plate by the edge sheet
By being fixed on the main surface of the ferrite plate,
Each insulation sheet covers the intersection of each center electrode
By arranging them in such a positional relationship,
It is characterized in that the poles are insulated from each other .

[0012]

In the invention according to the first aspect, the respective center electrodes are mutually insulated from each other by an insulating sheet having tackiness or adhesiveness, and the respective center electrodes are fixed on the main surface of the ferrite plate. Therefore, even if each center electrode is thin, it can be fixed and held at a predetermined position, so that productivity can be improved, and deterioration and variation in electrical characteristics due to displacement of the center electrode can be eliminated.

[0013]

1 and 2 show the structure of an isolator according to an embodiment of the present invention. In particular, FIG. 1 is an exploded perspective view of a ferrite assembly, and FIG. 2 is a ferrite assembly shown in FIG. FIG. 3 shows an external perspective view of a completed state of the assembly. In the figure, this isolator uses an electrode called a ferrite assembly type, like the circulator shown in FIGS. As shown in FIG.
A thin disk-shaped ferrite plate 1 is placed on the substrate. Next, the center electrode 21 is bent inward and abuts on the upper surface of the ferrite plate 1. Next, the insulating sheet 30 is attached from above the center electrode 21. Here, the insulating sheet 30
(Surface facing the upper surface of the ferrite plate 1) has adhesiveness or adhesiveness. Therefore, the center electrode 2
1 is securely fixed and held on the ferrite plate 1 by the insulating sheet 30. Next, the center electrode 22 is bent inward, and an adhesive or adhesive insulating sheet 30 is attached thereon. Therefore, the center electrode 22 is insulated from the center electrode 21 by the insulating sheet 30 and is securely fixed and held on the ferrite plate 1. Next, the center electrode 23 is bent inward, and an adhesive or adhesive insulating sheet 30 is attached thereon. Therefore, the center electrode 23
Are insulated from the center electrode 22 by the insulating sheet 30, and are securely fixed and held on the ferrite plate 1.

As described above, since the respective insulating sheets 30 for insulating the respective center electrodes from each other have adhesiveness or adhesiveness, the respective center electrodes 21 to 23 are securely fixed at predetermined angular positions. , Does not cause displacement. Therefore,
Even if extremely thin center electrodes 21 to 23 are used, the productivity does not decrease and the electrical characteristics do not deteriorate or vary.

The tip of the center electrode 21 is connected to an input / output port 51 via a matching circuit constituted by a capacitor C1. The tip of the center electrode 22 is connected to a capacitor C
Input / output port 52 via a matching circuit composed of
Connected to. The tip of the center electrode 23 is connected to a terminating resistor R via a matching circuit formed by a capacitor C3. Therefore, the isolator shown in FIG.
A high-frequency signal is transmitted from the input / output port 51 to the input / output port 52 only in one direction.

In the isolator shown in FIG.
By removing the terminating resistor R and connecting the input / output port to the end of the center electrode 23, the isolator shown in FIG. 2 can be used as a circulator as shown in FIG.

FIGS. 3, 4 and 5 are views showing the configuration of an isolator according to another embodiment of the present invention. In particular, FIG. 3 is an exploded perspective view of a ferrite assembly, and FIG. The appearance perspective view of the completed state of the ferrite assembly shown in
FIG. 5 is an exploded perspective view of the entire configuration of the isolator. As shown in FIGS. 3 and 4, first, a band-shaped center electrode 201 is wound around the ferrite plate 1,
Paste the insulating sheet 30 from the upper surface of the ferrite plate 1
The insulating sheet 31 is attached from the lower surface of the substrate. Here, the lower surface of the insulating sheet 30 (the surface facing the upper surface of the ferrite plate 1) has tackiness or adhesion, and the insulating sheet 3
The upper surface of 1 (the surface facing the lower surface of the ferrite plate 1) has tackiness or adhesiveness. Therefore, the center electrode 2
01 is securely fixed and held on the upper and lower surfaces of the ferrite plate 1 by the insulating sheets 30 and 31. Next, the band-shaped center electrode 202 is connected to the center electrodes 201 and 120.
The ferrite plate 1 is wound around the ferrite plate 1 at an interval of °, an adhesive or adhesive insulating sheet 30 is attached from the upper surface of the ferrite plate 1, and an adhesive or adhesive insulating sheet 31 is attached from the lower surface of the ferrite plate 1. wear. Therefore, the center electrode 202 is connected to the insulating sheets 30 and 31.
Thus, the ferrite plate 1 is securely fixed and held on the upper and lower surfaces. Next, the band-shaped center electrode 203 is wound around the ferrite plate 1 at an interval of 120 ° with respect to the center electrode 201 and the center electrode 202, and an adhesive or adhesive insulating sheet 30 is attached from the upper surface of the ferrite plate 1; An adhesive or adhesive insulating sheet 31 is attached from the lower surface of the ferrite plate 1. Therefore, the center electrode 203 is securely fixed and held on the upper and lower surfaces of the ferrite plate 1 by the insulating sheets 30 and 31.

As described above, since the respective insulating sheets 30 and 31 for insulating the respective center electrodes have adhesiveness or adhesiveness, the respective center electrodes 201 to 203 are securely fixed at predetermined angular positions. , Does not cause displacement. Therefore, even if the extremely thin center electrodes 201 to 203 are used, the productivity does not decrease and the electrical characteristics do not deteriorate or vary.

One end of the center electrode 201 is connected to a capacitor C1.
Is connected to the input / output port 51 via a matching circuit composed of One end of the center electrode 202 is connected to the input / output port 52 via a matching circuit formed by the capacitor C2. One end of the center electrode 203 is connected to a terminating resistor R via a matching circuit formed by a capacitor C3. The other ends of the center electrodes 201 to 203 are grounded. Therefore, the isolator shown in FIG. 4 transmits a high-frequency signal only in one direction from input / output port 51 to input / output port 52.

In the isolator shown in FIG.
By removing the terminating resistor R and connecting the input / output port to one end of the center electrode 203, the isolator shown in FIG. 4 can be used as a circulator as shown in FIG.

Next, referring to FIG. 5, a resin substrate 7 is mounted on lower yoke 6 made of a conductor. Various electrodes are formed on the upper and lower surfaces of the resin substrate 7 by, for example, molding. First, a ground electrode 7 a is formed on the lower surface of the resin substrate 7. On the other hand, on the upper surface of the resin substrate 7, ground electrodes 7b to 7h and input / output electrodes 7i to 7k are formed. Ground electrodes 7b to 7f
Respectively penetrate the resin substrate 7 and form a ground electrode 7a on the lower surface.
Is connected to The ground electrodes 7g and 7h are
The side surface of the resin substrate 7 is connected to the ground electrode 7a on the upper surface. The ground electrodes 7a to 7h are preferably formed by bending a single metal plate. The input / output electrodes 7i and 7j are bent along the side surface of the resin substrate 7,
Input / output ports 51 and 52 are formed on side surfaces of the resin substrate 7 respectively. Note that a through hole 70 is formed in the center of the resin substrate 7.

The ferrite assembly 10 shown in FIG. 4 is placed at the center of the surface of the resin substrate 7 and fixed by soldering or the like. At this time, one ends of the center electrodes 201 to 203 are in contact with the input / output electrodes 7i to 7k, respectively. The other ends of the center electrodes 201 to 203 are in contact with the ground electrodes 7b to 7d, respectively. FIG. 6 shows a connection relationship between the center electrode 201 and each electrode for reference. As is clear from FIG. 6, one end of the center electrode 201 is connected to the input / output electrode 7i, and the other end is connected to the ground electrode 7b. In the center of the lower surface of the ferrite plate 1, a protruding portion is formed when the center electrodes 201 to 203 cross each other. Ferrite assembly 10
There is no gap between them. This prevents the ferrite assembly 10 from rattling on the resin substrate 7.

Next, chip capacitors C1 to C3 forming a matching circuit and a chip resistor R as a terminating resistor are fixed to the upper surface of the resin substrate 7 by soldering or the like. The chip capacitor C1 has one electrode in contact with the ground electrode 7e and the other electrode in contact with the input / output electrode 7i.
The chip capacitor C2 has one electrode in contact with the ground electrode 7f and the other electrode in contact with the input / output electrode 7j. The chip capacitor C3 has one electrode in contact with the ground electrode 7g and the other electrode in contact with the input / output electrode 7k. The chip resistor R has one end in contact with the ground electrode 7h and the other end in contact with the input / output electrode 7k.

Next, an upper yoke 8 made of a conductor is put on the lower yoke 6. Note that a magnet 9 is fixed to the back surface of the upper yoke 8. The magnet 9 is for applying a DC magnetic field to the ferrite assembly 10.

In the above embodiment, only one surface of the insulating sheet is provided with adhesiveness or adhesiveness. However, both surfaces of the insulating sheet may be provided with adhesiveness or adhesiveness. In this case, the uppermost central electrode 23 or 2
The insulating sheet pasted on 03 can be omitted.

In the above embodiment, a non-reciprocal circuit device having a structure in which three center electrodes are attached to the ferrite plate 1 at an angle of 120 ° is shown, but the present invention is not limited to this. Is not done, ferrite plate 1
However, the present invention can also be applied to a non-reciprocal circuit device in which two or four or more center electrodes are attached at predetermined angular intervals.

[0027]

As described above, according to the present invention, the respective center electrodes are insulated from each other by the adhesive or adhesive insulating sheet, and the respective center electrodes are fixed on the main surface of the ferrite plate. Therefore, even if each center electrode is thin, it can be fixed and held at a predetermined position, thereby improving productivity and eliminating deterioration and variation in electrical characteristics due to displacement of the center electrode. .

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a configuration of a ferrite assembly in an isolator according to an embodiment of the present invention.

FIG. 2 is an external perspective view showing a configuration of a completed state of the ferrite assembly shown in FIG.

FIG. 3 is an exploded perspective view showing a configuration of a ferrite assembly in an isolator according to another embodiment of the present invention.

FIG. 4 is an external perspective view showing the configuration of a completed state of the ferrite assembly shown in FIG. 3;

FIG. 5 is an exploded perspective view showing an overall configuration of an isolator using the ferrite assembly shown in FIG.

6 is a partial sectional view of the isolator shown in FIG.

FIG. 7 is an exploded perspective view showing an example of a configuration of a ferrite assembly in a conventional lumped constant type circulator.

8 is an external perspective view showing a configuration of the ferrite assembly shown in FIG. 7 in a completed state.

FIG. 9 shows a conventional lumped constant type circulator.
It is sectional drawing which shows the thing of a normal size and the downsized thing in comparison.

FIG. 10 is an exploded perspective view showing another example of the configuration of the ferrite assembly in the lumped constant type circulator proposed by the present applicant.

11 is an external perspective view showing a configuration of the ferrite assembly shown in FIG. 10 in a completed state.

[Explanation of symbols]

 1: Ferrite plate 6: Lower yoke 7: Resin substrate 8: Upper yoke 9: Magnet 10: Ferrite assembly 20: Ground electrode 21 to 23, 201 to 203: Center electrode 30, 31: Insulating sheet 51 to 53: Input / output Ports C1 to C3: Capacitor constituting matching circuit R: Terminating resistor

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Rikuhiro Tsunemon 2-26-10 Tenjin, Nagaokakyo-shi, Kyoto Murata Manufacturing Co., Ltd. (56) References JP-A-58-85609 (JP, A) Kaihei 2-134711 (JP, U) Japanese Utility Model Showa 62-86705 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A non-reciprocal circuit device having an extremely small attenuation in a signal transmission direction and an extremely large attenuation in a reverse direction, comprising: a ferrite plate to which a DC magnetic field is externally applied; On the other hand, on the main surface,
A plurality of band-shaped center electrodes arranged so as to intersect in a direction orthogonal to the DC magnetic field and at a predetermined angular interval,
And an area larger than the intersection of the center electrodes , which is disposed on each of the center electrodes and has tackiness or adhesiveness
A plurality of insulating sheets each having a center electrode, each of which is disposed immediately above the center electrode.
Affixed on the main surface of the ferrite plate with an insulating sheet
Is attached on the main surface of the ferrite plate.
In fixed, each said insulating sheet is crossing each of the center electrode
By being stacked and arranged in a positional relationship that covers the part,
A non-reciprocal circuit device, wherein the respective center electrodes are insulated from each other .