JP3353858B2 - 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. The non-reciprocal circuit device according to the present invention is used as an isolator or a circulator in a communication system such as a car phone, a mobile phone, and a cordless phone.

[0002]

2. Description of the Related Art Non-reciprocal circuit devices are used as isolators or circulators in communication systems such as automobile telephones, portable telephones and cordless telephones. As a conventional technology of a non-reciprocal circuit device, for example, Japanese Unexamined Utility Model Publication No. 3-84
Japanese Patent Application Laid-Open No. 604 is known. The general configuration is to arrange a ferrimagnetic material such as ferrite or YIG on both sides of the center conductor, and outside the ferrimagnetic material,
Each has a structure in which permanent magnets are arranged. Therefore, it is fundamental to use two ferrimagnetic materials and two permanent magnets. The center conductor includes three strip conductors arranged on a single support substrate so as to cross each other at an angle of 120 degrees.

[0003]

As described above, non-reciprocal circuit devices are used for communication systems such as automobile telephones, portable telephones, cordless telephones, etc., and their miniaturization and thinning are extremely important. Matters. But,
Since a conventional general non-reciprocal circuit device uses two ferrimagnetic materials and two permanent magnets, there is a limit in reducing the size and thickness.

[0004] In response to demands for miniaturization and thinning, for example, Japanese Patent Application Laid-Open Nos.
Japanese Patent No. 3319 discloses a technique for reducing the size and thickness by providing a hole for inserting a ferrimagnetic material in a multilayer capacitor substrate for obtaining inter-terminal capacitance and ground capacitance, and inserting the ferrimagnetic material into the hole. However, since it is premised that two ferrimagnetic materials and two permanent magnets are used, miniaturization and thinning are also limited.

[0005] An effective means for reducing the size and thickness is to reduce the number of ferrimagnetic bodies and permanent magnets provided two by two to one. Attempts have been made to use one permanent magnet, and such products are already in practical use. JP-A-63-107203 discloses a technique using one ferrimagnetic material.

However, under the structure of the conventional center conductor,
It is difficult to reduce the number of ferrimagnetic materials to one because it causes the following technical problems. That is, in the conventional center conductor, the respective halves of three strip conductors to be crossed at an angle of 120 degrees are substantially uniformly arranged on both surfaces of the support substrate. For this reason, when the number of ferrimagnetic bodies is reduced to one, the distance between the three halves of the strip conductor arranged on one side facing the ferrimagnetic body and the ferrimagnetic body is set on the other surface of the support substrate. The distance between the other three halves of the strip conductor and the ferrimagnetic material is increased by the thickness of the support substrate. As a result, the coupling between each of the three strip conductors and the ferrimagnetic material becomes loose on the other surface side of the support substrate, the insertion loss increases, and the characteristics deteriorate.

An object of the present invention is to provide a non-reciprocal circuit device which is reduced in size and thickness without deteriorating characteristics.

[0008]

A non-reciprocal circuit device according to the present invention includes a center conductor, a ferrimagnetic material, and a permanent magnet. The center conductor includes a support substrate and a strip conductor, and the number of the strip conductors is three, and the three strip conductors are arranged on the support substrate so as to intersect each other at an angle of about 120 degrees. . Of the three strip conductors, two strip conductors are arranged on one surface side of the support substrate, and the remaining strip conductors are arranged on the other surface of the support substrate.

Further, in the crossing region, one of the two strip conductors arranged on one surface side of the support substrate is continuous on the one surface side, the other is discontinuous on the one surface side, and Are connected by a connecting conductor arranged on the other surface side.

[0010] The ferrimagnetic body is one piece, and is disposed so as to face the center conductor, and the permanent magnet applies a DC magnetic field to the ferrimagnetic body.

In one example, the two strip conductors arranged on the one surface side of the support substrate constitute input / output strip conductors. The remaining strip conductor is grounded via a resistor.

[0012]

Since there are three strip conductors, each of which is arranged on the support substrate so as to cross each other at an angle of about 120 degrees, a combination of a ferrimagnetic material, a permanent magnet, and more preferably, a capacitor is used. Thereby, a non-reciprocal circuit device used as a circulator or an isolator can be realized.

[0013] Of the three strip conductors, two strip conductors are arranged on one surface side of the support substrate, and the remaining strip conductors are arranged on the other surface of the support substrate. When the ferrimagnetic material is disposed on one of the two sides, two of the three strip conductors are coupled to the ferrimagnetic material under substantially the same conditions.
For this reason, by using these two strip conductors for input and output, it is possible to avoid an increase in insertion loss due to a difference in coupling with the ferrimagnetic material, and to obtain a characteristic comparable to the case of using two ferrimagnetic materials. Can be secured. Since the property securing action described here is discussed on the assumption that one ferrimagnetic material is used, the number of ferrimagnetic materials is reduced by half, the number of parts is reduced, and the thickness and thickness are reduced. It is possible to secure characteristics comparable to the case where a ferrimagnetic material is used. The remaining strip conductors arranged on the other side of the support substrate are coupled to the ferrimagnetic material under different conditions from the two strip conductors arranged on the one side, but the remaining strip conductors are In the case of an isolator, since it is used for grounding, no problem occurs.

In addition, two of the three strip conductors are arranged on one surface of the support substrate, and the remaining strip conductors are arranged on the other surface of the support substrate. The three-dimensional cross structure for insulation to be formed between the strip conductors need only be considered for two strip conductors. Therefore, the three-dimensional crossover structure is simplified.

As a specific mode of the two strip conductors formed on one surface side of the support substrate, one is continuous on one surface side of the support substrate, the other is discontinuous on one surface side, and By taking a continuous structure with the connecting conductors arranged on the other surface side, a three-dimensional cross structure to be formed between the two strip conductors can be easily realized.

Also, since one ferrimagnetic material is used,
By reducing the number of ferrimagnetic materials by half, it is possible to realize a nonreciprocal circuit device in which the number of parts is reduced, and the size and thickness are reduced.

Further, since one surface side of the support substrate on which the two strip conductors are arranged faces the ferrimagnetic material,
The coupling between the two strip conductors and the ferrimagnetic material can be made dense. Under such a structure, two strip conductors arranged on one surface side of the support substrate constitute an input / output strip conductor, and the remaining strip conductors are grounded via a resistor, whereby the two strip conductors are grounded. By making the coupling between the strip conductor and the ferrimagnetic material dense, it is possible to realize an isolator having characteristics comparable to the case where two ferrimagnetic materials are used.

[0018]

1 is an exploded perspective view of a non-reciprocal circuit device according to the present invention, FIG. 2 is a plan view of the non-reciprocal circuit device shown in FIG. 1, and FIG. 3 is a cross-sectional view taken along line A3-A3 in FIG. 4 is a circuit diagram in the use state, FIG. 5 is a plan view of a center conductor used in the non-reciprocal circuit device according to the present invention, and FIG. 6 is a back view of the center conductor shown in FIG. The nonreciprocal circuit device according to the present invention includes a center conductor 3, a ferrimagnetic material 4, and a permanent magnet 5.
And

As shown in FIGS. 5 and 6, the center conductor 3 is formed of a supporting substrate 1 and strip conductors 21 to 23.
And There are three strip conductors 21 to 23,
They are arranged on the support substrate 1 so as to cross each other at an angle of about 120 degrees. Three strip conductors 2
Of the strip conductors 1 to 23, most of the strip conductors 21 and 22 except for the intersection regions P1 to P4 are arranged on one surface 11 of the support substrate 1 (see FIG. 5), and the remaining strip conductors 2
Reference numeral 3 is arranged on the other surface of the support substrate 1 (see FIG. 6).

As described above, the strip conductors 21 to 23
Are arranged on the support substrate 1 so as to intersect each other at an angle of about 120 degrees. Therefore, by combining the ferrimagnetic material 4, the permanent magnet 5, and more preferably a capacitor, A non-reciprocal circuit device used as a circulator or an isolator can be realized.

Moreover, the three strip conductors 21 to 23
Of these, the two strip conductors 21 and 22 are arranged on one surface 11 of the support substrate 1 and the remaining strip conductors 23 are arranged on the other surface 12 of the support substrate 1.
When used in a non-reciprocal circuit device, as will be described in detail later, size reduction and thickness reduction can be achieved without deteriorating characteristics.

Of the three strip conductors 21 to 23, two strip conductors 21 and 22 are arranged on one surface 11 of the support substrate 1, and the remaining strip conductors 23 are arranged on the other surface 12 of the support substrate 1. Since they are arranged, the three-dimensional insulating crossing structure to be formed between the strip conductors in the crossover regions P1 to P4 has two strip conductors 21,
Only 22 needs to be considered. Therefore, the three-dimensional crossover structure is simplified.

Further, as specific embodiments of the two strip conductors 21 and 22 formed on one surface 11 of the support substrate 1,
In the intersecting regions P1 to P4, one is continuous on one surface 11 of the support substrate 1, the other is discontinuous on the one surface 11, and the connecting conductors 24, 25 arranged on the other surface 12 of the support substrate 1;
A continuous structure is formed by 26 and 27. This allows
The three-dimensional cross structure to be formed between the two strip conductors 21 and 22 can be easily realized.

In the embodiment shown in FIGS. 5 and 6, the strip conductor 21 has terminal portions 211 and 212 at both ends, and has two parallel strip lines 213 and 214 between the terminal portions 211 and 212. .

The strip conductor 22 has terminal portions 221 at both ends.
And 222, and the terminal portion 221 and the terminal portion 22.
2, two parallel strip lines 223 and 2
24.

Strip line 2 of strip conductor 21
13 is a strip line 223 of the strip conductor 22
And 224 in the intersection areas P1 and P2.
The strip line 213 is continuous in the intersection area P1, but is discontinuous in the intersection area P2. This discontinuity is eliminated by the connecting conductor 24 provided on the other surface side of the support substrate 1. Therefore, the strip line 213 is continuous between the terminal portions 211 and 212 via the connecting conductor 24.

Strip line 2 of strip conductor 21
14 is a strip line 223 of the strip conductor 22
And 224 in the intersection areas P3 and P4.
The strip line 214 is continuous in the intersection area P4, but is discontinuous in the intersection area P3. This discontinuity is eliminated by the connection conductor 25 provided on the other surface side of the support substrate 1. Accordingly, the strip line 214 is also continuous between the terminal portions 211 and 212 via the connecting conductor 25.

Strip line 2 of strip conductor 22
23 is a strip line 213 of the strip conductor 21
And 214 in the intersection areas P1 and P3.
The strip line 223 is continuous in the intersection area P3, but is discontinuous in the intersection area P1. This discontinuity is eliminated by the connecting conductor 27 provided on the other surface side of the support substrate 1. Therefore, the strip line 223 is continuous between the terminal portions 221 and 222 via the connecting conductor 27.

The strip line 2 of the strip conductor 22
24 is a strip line 213 of the strip conductor 21
And 214 in the intersection areas P2 and P4.
The strip line 224 is continuous in the intersection area P2, but is discontinuous in the intersection area P4. This discontinuity is eliminated by the connecting conductor 26 provided on the other surface 12 of the support substrate 1. Accordingly, the strip line 224 is also continuous between the terminal portions 221 and 222 via the connecting conductor 26.

Strip lines 213, 214, 22
3, 224 and the connection conductors 24 to 27 are connected by a through conductor 28 penetrating from one surface 11 to the other surface 12 of the support substrate 1. These through conductors 28 can be formed by plating. Also, the terminal portion 211 of the strip conductor 21,
Terminal portions 215 and 2
The terminal portions 211 and 215 and the terminal portions 212 and 216 are electrically connected to each other by the through conductor 29. Similarly, the terminal portion 2 of the strip conductor 22
The terminal portion 225 is located at the position of the other surface 12 facing the
And the terminal part 221 and the terminal part 225, and the terminal part 222 and the terminal part 226 are electrically connected to each other by the through conductor 29.

The strip conductor 23 has terminal portions 23 at both ends.
1 and 232, and a terminal portion 231 and a terminal portion 2
32, there are two parallel strip lines 233 and 234. Strip lines 233 and 234
Are arranged at an interval from the connection conductors 24 to 27. The terminal portions 231 and 232 are formed by through conductors 237.
Terminal portions 235 and 23 provided on one surface 11 of support substrate 1
6, respectively.

The ferrimagnetic material 4 is one, and is disposed so as to face the center conductor 3. Ferrimagnetic material 4
2 is made of a ferrimagnetic material such as YIG (yttrium-iron-garnet). The permanent magnet 5 is a ferrimagnetic material 4
A DC magnetic field.

The center conductor 3 is preferably arranged such that one surface 11 of the support substrate 1 on which the two strip conductors 21 and 22 are arranged faces the ferrimagnetic material 4. In such a structure, the two strip conductors 21 and 22 arranged on one surface 11 of the support substrate 1 constitute an input / output strip conductor, and the strip conductor 23 is grounded via a resistor. The circuit is connected to form a non-reflective terminal end.

In the embodiment, the capacitor laminate 6, the shield member 7, the case 8, the yokes 91 and 92,
A resistor 10 is included. The capacitor laminate 6 is shown in FIG.
Between terminals C11 to C13 and ground capacitances C01 to C0
3 can be obtained. The structure of such a capacitor laminate 6 is described in, for example, Japanese Patent Application Laid-Open No. Hei 6-163319. The capacitor laminate 6 has holes 61 for inserting the ferrimagnetic material 4 in the plane. The shield member 7 is a thin copper plate plated with silver.

The case 8 is made of an insulating material, for example, a resin. Case 8 has a surface on which center conductor 3 is placed,
An electrode 811 led from the terminal 81, an electrode 821 led from the terminal 82, an electrode 831 led from the terminal 83, and an electrode 841 led from the terminal 84 are provided. These electrodes 811 to 841 are used to connect the center conductor 3, the capacitor laminate 6, and the resistor 10 so that the circuit configuration shown in FIG. 4 is obtained.

The yoke 91 can be made of iron plated with silver and coated with a fluorine resin, and the yoke 92 can be made of a thin iron plate plated with nickel.

The resistor 10 has a resistor 10a and electrodes 10b and 10c which are conductive on both sides of the resistor 10a.
It is arranged on one side of the upper surface of the case 8. The resistor 10 includes, as a resistor 10 a, a resistor material such as ruthenium oxide (RuO) on an alumina substrate, and an electrode 10.
B and 10c are formed by a printing technique using an electrode material such as silver-palladium (AgPd).

In assembling, the permanent magnet 5 is inserted into the hole of the case 8, a resistor 10 is arranged on one side of the upper surface of the case 8, and the center conductor 3 is , The capacitor laminate 6 is placed on the center conductor 3, the upper ferrimagnetic material 4 is inserted into the hole 61 of the capacitor laminate 6, and then the shield member 7 is covered. Subsequently, the yokes 91 and 92 are fixed. Thereby, an isolator having the structure shown in FIG. 4 is obtained.

In FIG. 4, the terminal portion 215 of the strip conductor 21 is connected to the terminal 83 via the electrode 831. Terminal 83 is used as input terminal IN. The terminal portion 225 of the strip conductor 22 is
Connected to terminal 84. Terminal 84 constitutes output terminal OUT. The terminal portion 237 of the strip conductor 23 is connected to one end of the resistor R by the resistor 10. The other end of the resistor R is connected to a terminal 81 via an electrode 811. The terminal 81 is used as a ground terminal. The ground capacitances C01 to C03 obtained by the capacitor laminate 6 are
1 is connected to the terminal 81. Thus, an isolator is obtained in which the strip conductors 21 and 22 are input / output strip conductors and the strip conductor 23 is the grounding strip conductor. The inter-terminal capacitances C11 to C13 are obtained by the capacitor laminate 6 together with the ground capacitances C01 to C03. The connection relationship between the capacitor laminate 6, the center conductor 3, and the resistor 10 as shown in FIGS. 1 to 4 is known, for example, from Japanese Patent Application Laid-Open No. Hei 6-163319.

In the nonreciprocal circuit device according to the present invention, the center conductor 3 is, as described with reference to FIGS.
Since the three strip conductors 21 to 23 are arranged on the support substrate 1 so as to cross each other at an angle of about 120 degrees, the ferrimagnetic material 4, the permanent magnet 5, and more preferably, the capacitor laminate 6 By combining them, a non-reciprocal circuit device used as a circulator or an isolator can be realized.

Of the three strip conductors 21 to 23, two strip conductors 21 and 22 are arranged on one surface 11 of the support substrate 1, and the remaining strip conductors 23 are arranged on the other surface 12 of the support substrate 1. When the ferrimagnetic material 4 is disposed on one of the two surfaces of the support substrate 1, two of the three strip conductors 21 to 23 are disposed.
The two strip conductors 21 and 22 are coupled to the ferrimagnetic material 4 under substantially equal conditions. Therefore, by using the two strip conductors 21 and 22 for input and output, it is possible to avoid an increase in insertion loss due to a difference in coupling with the ferrimagnetic body 4 and to use the two ferrimagnetic bodies 4. It is possible to secure characteristics comparable to those in the case of

Since the property securing action described here is based on the premise that one ferrimagnetic material 4 is used,
While halving the number of ferrimagnetic members 4 and reducing the number of parts, reducing the thickness and size, it is possible to secure characteristics comparable to the case where two ferrimagnetic members 4 are used.

The strip conductor 23 arranged on the other surface 12 of the support substrate 1 is coupled to the ferrimagnetic material 4 under different conditions from the two strip conductors 21 and 23 arranged on the one surface 11. In the case of an isolator, the strip conductor 23 is used by being grounded via the resistor 10, so that no problem occurs.

Further, one surface 11 of the support substrate 1 on which the two strip conductors 21 and 22 are disposed is
, The coupling between the two strip conductors 21 and 22 and the ferrimagnetic material 4 can be made dense. Under such a structure, one surface 11 of the support substrate 1
The strip conductors 21 and 23 arranged on the resistor 10 constitute an input / output strip conductor, and the strip conductor 23
In a preferred example in which the reflection-free termination is constituted by the resistor 10 and the input / output strip conductors 21, 2
The coupling between the ferrimagnetic material 2 and the ferrimagnetic material 4 is made dense, so that an isolator having characteristics comparable to those using two ferrimagnetic materials can be realized.

[0045]

As described above, according to the present invention, it is possible to provide a non-reciprocal circuit device which is reduced in size and thickness without deteriorating characteristics.

[Brief description of the drawings]

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

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

FIG. 3 is a cross section taken along line A3-A3 in FIG. 2;

FIG. 4 is a circuit diagram in a use state of the non-reciprocal circuit device according to the present invention.

FIG. 5 is a plan view of a center conductor used in the non-reciprocal circuit device according to the present invention.

FIG. 6 is a back view of the center conductor shown in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support substrate 11 One surface 12 Other surface 21-23 Strip conductors P1-P4 Intersection area 3 Center conductor 4 Ferrimagnetic material 5 Permanent magnet

(56) References JP-A-63-107203 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01P 1/383 H01P 1/36

Claims (2)

(57) [Claims] 1. A non-reciprocal circuit device including a center conductor, a ferrimagnetic material, and a permanent magnet, wherein the center conductor includes a support substrate and a strip conductor, and the strip conductor includes Wherein each of the three strip conductors is disposed on one surface of the support substrate so as to cross each other at an angle of about 120 degrees. The remaining strip conductor is disposed on the other surface of the support substrate, the two strip conductors disposed on one surface side of the support substrate, one in the intersection region is continuous on the one surface side, The other is discontinuous on the one surface side, and continuous by a connecting conductor disposed on the other surface side of the support substrate, and the number of the ferrimagnetic material is one, and the surface is opposed to the center conductor. Are urchin arranged, the permanent magnet is non-reciprocal circuit device for applying a DC magnetic field to the ferrimagnetic material. 2. The non-reciprocal circuit device according to claim 1, wherein the two strip conductors arranged on the one surface side of the support substrate constitute input / output strip conductors, and the remaining A non-reciprocal circuit device in which the strip conductor is grounded via a resistor.