JPH0774516A - Irreversible circuit element - Google Patents

Abstract

PURPOSE:To obtain a reversible circuit element which can be miniaturized regardless of the sizes of the values of matching capacitance. CONSTITUTION:A circulator 1 has a multilayer substrate 3 for forming a center electrode 16a and capacitance for matching. The multilayer substrate 3 is formed by laminating plural sheets of dielectric sheet where the center electrode or a capacitance electrode for matching is formed and integratedly firing,them. Capacitance for matching is composed by connecting a laminated type capacitance part composed by laminating many sheets of dielectric sheet held by a pair of capacitance electrodes in parallel. On the upper surface of the multilayer substrate 3, a first recessed part 26 for accepting a ferrite 21 and a second recessed part 25 for accepting a permanent magnet 5 are provided at the location confronting the center electrode 16, and at this inside, each ferrile 4 and permanent magnet 5 is mounted.

Description

Detailed Description of the Invention

[0001]

The present invention relates to VHF, UHF, SH
The present invention relates to a non-reciprocal circuit element used in the F band, for example, a circulator or an isolator, and particularly to a structure capable of downsizing, weight saving, and cost reduction of parts.

[0002]

2. Description of the Related Art Generally, non-reciprocal circuit elements such as isolators and circulators have a function of passing signals only in the transmission direction and blocking transmission in the opposite direction, and are used in mobile phones, car phones and the like. It is an indispensable component in the transmission circuit section of communication equipment. In such applications, the nonreciprocal circuit device is required to have smaller and lighter parts. Further, in order to stimulate demand, it is required to reduce the price of parts. In order to meet such a demand, a nonreciprocal circuit device having a structure in which a central electrode, a matching circuit electrode, and the like are collectively arranged on a dielectric substrate has been proposed. An example of a circulator having such a structure is shown in FIGS. 8 and 9. FIG. 9 shows the cross-sectional structure of the circulator, and FIG. 8 mainly shows the structure of the dielectric substrate. A conventional circulator 100 includes a dielectric substrate 107 to 109, a ferrite 104, and a magnet 1 inside a metal yoke 101.
06 is arranged. The ferrite 104 is the ground plate 10
5 is connected to the bottom surface of the yoke 104. The dielectric substrates 107 to 109 are arranged at positions where the center electrode 102 formed on the substrates faces the ferrite 104. Further, the magnet 106 is attached to the inner upper surface of the yoke 101 so as to face the center electrode 102.
Then, the magnet 106 applies a DC magnetic field to the ferrite 104.

As shown in FIG. 8, the center electrode 102, the capacitor electrode 110, and the ground electrode 111 are formed in a laminated body of three dielectric substrates 107 to 109. This laminated substrate is manufactured by the following steps. First, the ceramic green sheet is fired and each of the substrates 107-
After forming 109, the center electrode 102, the capacitor electrode 110, and the ground electrode 1 are formed on one main surface of each of the substrates 107 to 109.
11 is patterned, and the ground electrode 112 is formed on the other main surface.
Then, a pattern is formed and a baking process is performed. Then, the dielectric substrates 107 to 109 on which the electrodes are formed are stacked and pressure-bonded. Further, the ground electrodes 111 and 112 are connected to each other using the through hole electrode 113. An external electrode 114 connected to the input / output terminal is formed on each capacitance electrode 110. In this laminated structure, the capacitive electrode 11
0, each of the dielectric substrates 107 to 109 and the ground electrode 112
The matching capacitance is formed by.

In this conventional circulator, a matching capacitor is formed around three center electrodes 102 intersecting with each other, whereby the size of the entire component is reduced.

[0005]

However, the structure as described above has a problem that miniaturization is restricted in terms of securing the capacitance value of the matching capacitor. That is, the capacitance value of the matching capacitance is defined by the facing area between the capacitance electrode 110 and the ground electrode 112. Therefore, if the required capacitance value increases, the electrode area of the capacitance electrode 110 must be increased. Therefore, each dielectric substrate 107-
The substrate area of 109 is increased, and as a result, the size of the entire component is increased. In other words, the size of the component is restricted by the required capacitance value.

Further, the conventional structure requires two firing steps of firing the ceramic green sheet and firing each patterned electrode on the substrate, resulting in a high manufacturing cost. There was also. In terms of manufacturing cost, the magnet 106 and the ferrite 104
The complicated assembly work of individually positioning and fixing the above in the yoke 101 has also been a factor of increasing the manufacturing cost.

An object of the present invention is to provide a non-reciprocal circuit device which can be downsized.

[0008]

According to a broad aspect of the present invention, a nonreciprocal circuit device includes a multilayer substrate in which a plurality of dielectric layers are laminated, and an electrically non-reciprocal circuit formed in the multilayer substrate. A matching capacitor having a plurality of center electrodes formed to intersect each other in an insulated state, a plurality of capacitor parts stacked in a multilayer substrate and connected to each center electrode, and a matching capacitor provided so as to face the center electrode. And a magnet for applying a DC magnetic field to the magnetic body.

According to this structure, the matching capacitance is
A necessary capacitance value can be ensured by appropriately setting the number of stacked capacitor portions stacked in the multilayer substrate. Therefore, the capacitance value of the matching capacitor can be increased without increasing the area in the plane area of the multilayer substrate. As a result, the planar size of the non-reciprocal circuit device can be reduced, and the size of the component can be reduced.

Another object of the present invention is to provide a non-reciprocal circuit device capable of reducing the size of parts and reducing the cost of parts. A nonreciprocal circuit device according to another aspect of the present invention is formed by integrally firing a plurality of dielectric layers on which a multilayer substrate is laminated.

With such a structure, the multilayer substrate is integrally formed by a single firing process. Therefore, as compared with the conventional non-reciprocal circuit device described above, the firing process is reduced and the manufacturing cost is reduced.

Further, in the nonreciprocal circuit device according to another aspect of the present invention, the first holding portion for holding the magnetic body at a position facing the center electrode is formed in the multilayer substrate, and the magnetic body is It is held by this first holding portion.

With such a structure, the relative position of the magnetic body to the center electrode is automatically set by mounting the magnetic body on the first holding portion of the multilayer substrate. Therefore, a complicated positioning process can be omitted, and the manufacturing cost can be reduced.

Furthermore, in the nonreciprocal circuit device according to another aspect of the present invention, a second holding portion for holding the magnet at a position facing the center electrode is formed in the multilayer substrate, and the magnet is the second holding portion. It is held by the holding unit.

With this structure, the positional relationship between the magnet and the center electrode is automatically set by mounting the magnet on the second holding portion. Therefore, a complicated positioning process can be omitted, and the manufacturing cost can be reduced.

The plurality of center electrodes in the present invention may be formed at different height positions in the multilayer substrate. In this case, the plurality of center electrodes may be formed on the surfaces of different dielectric layers when the multilayer substrate is obtained by the integral firing technique.

Further, the center electrode is formed on the dielectric layer, and a first center electrode portion arranged on one surface of one dielectric layer in the substrate, a second center electrode portion arranged on the other surface of the dielectric layer. And a through-hole conductive portion that electrically connects the first and second center electrode portions to each other. In this case, when the multilayer substrate is obtained by the integral firing technique, the through hole conductive portion is formed on one dielectric layer, and the first and second center electrode portions are formed on the upper surface and the lower surface of the dielectric layer. Alternatively, the first center electrode portion may be formed on one surface of the dielectric layer on which the through-hole conductive portion is formed,
The second center electrode portion may be formed on one surface of another dielectric layer that is in contact with the other surface of the dielectric layer.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be clarified by describing embodiments of the nonreciprocal circuit device of the present invention with reference to the drawings.

First Embodiment The structure of a lumped constant type circulator according to the first embodiment of the present invention is shown in FIGS. Referring to FIG. 1, the circulator 1 has a multilayer substrate 3, a lower yoke 2 and an upper yoke 6. The lower yoke 2 and the upper yoke 6 are made of a magnetic metal and have a box shape so as to enclose the multilayer substrate 3 from above and below.

The multilayer substrate 3 has a first concave portion 26 for inserting the ferrite 4 and a permanent magnet 5 on the upper portion on the side of the upper yoke 6.
And a second recess 25 for receiving
Convex portions 7, 7 are formed at both ends on the side. The convex portions 7, 7 are external electrodes 8 serving as input / output terminals and ground terminals.
It projects from between the upper yoke 6 and the lower yoke 2 so that a to 8c and 9a to 9c are exposed to the outside. When the circulator 1 is mounted on the board, the external electrodes 8a to 8c and 9a to 9c are connected to the electrode lines on the circuit board.

The ferrite 4 is mounted in the second recess 26 in the multilayer substrate 3. In addition, the permanent magnet 5 has a ground plate 27.
It is mounted in the second recess 25 in the upper part of the ferrite 4 with the interposition of.

As shown in FIGS. 3 and 4, the multi-layer substrate 3 is a sintered body formed by integrally firing a large number of dielectric layers, and each electrode is embedded inside the sintered body. There is. Here, for convenience of description, reference numerals are given to each of the dielectric layers before sintering, and the configuration of each part will be described. First, referring to FIG. 4, the multilayer substrate 3 is mainly distinguished into six layers L1 to L6. The first layer L1 is a second layer for receiving the permanent magnet 5.
It has a recess 25 and is composed of, for example, two first dielectric sheets 12. A hole 1 sized to receive the permanent magnet 5 is formed in the center of the first dielectric sheet 12.
2a is formed.

The second layer L2 is formed with a first recess 26 for receiving the ferrite 4, and is composed of, for example, two second dielectric sheets 13. The second dielectric sheet 13 has a hole 13a having a size into which the ferrite 4 can be inserted, at the center thereof.

The third layer L3 is mainly for forming a matching capacitor, and is the third layer on which the ground electrode 14a is formed.
Plural sets of dielectric sheets 14 and fourth dielectric sheets 15 having the capacitance electrodes 15a to 15c are alternately laminated. The ground electrode 14a is formed on almost the entire surface of the third dielectric sheet 14 except for the central portion thereof, and the external lead-out portion 14b is provided on one side edge of the third dielectric sheet 14 and the external lead portion 2 is provided on the other side edge thereof. It has one external lead-out portion 14b. In addition, these external leads 14b are respectively connected to the external electrodes 8b and 9b.
a, 9c.

The capacitive electrodes 15a to 15c are evenly arranged on the surface of the fourth dielectric sheet 15 with an interval of 120 degrees from each other. And one capacitive electrode, eg 1
5a, one dielectric sheet 14 or 15, and one earth electrode 14a are combined to form one capacitance section. A large number of such capacitance portions are stacked on the third layer L3. Then, the number of stacked layers of the capacitance section is set according to the required capacitance value of the matching capacitance.

The fourth layer L4 is composed of three fifth dielectric sheets 16 on which the center electrode 16a is formed.
The fifth dielectric sheet 16 also serves as the dielectric sheet that constitutes the above-mentioned capacitance section. Each center electrode 16a
Has two lines extending in parallel to the central portion on the surface of the fifth dielectric sheet 16. Three fifth dielectric sheets 1
The center electrodes 16a formed in 6 to 16 are arranged on the respective dielectric sheets in a state of intersecting each other at an angle of 120 degrees. Further, one capacitance electrode 16b forming the above-mentioned one capacitance portion is connected to one end of each center electrode 16a. Also, the center electrode 1
The other end of 6a is connected to the ground electrode 16c.

An external lead electrode 16d is formed on each capacitor electrode 16b. The lead electrodes 16d are connected to the outer electrodes 8a, 8c, 9b, respectively. Also,
The external lead-out portion 16e formed on each ground electrode 16c is
It is connected to the external electrodes 8b, 9a, 9c, respectively.

The fifth layer L5 is formed by laminating a plurality of fourth dielectric sheets 14 having the ground electrode 14a formed thereon. The lowermost fourth dielectric sheet 14 is laminated so that the ground electrode 14a faces downward.

The sixth layer L6 is a portion which constitutes the two convex portions 7, 7 and comprises a plurality of strip-shaped ceramic sheets 23, 24.
Are stacked. Electrodes 8a 'to 8c' and 9a 'to 9c' corresponding to the external electrodes 8a to 8c and 9a to 9c are formed on the outer surfaces of the ceramic sheets 23 and 24, respectively.

In the above structure, the plurality of capacitance electrodes 15a and 16b formed on the third layer L3 are connected in the stacking direction via the through hole electrodes 20. Similarly, the capacitance electrodes 15b and 16b and the capacitance electrodes 15c and 16b are connected in the stacking direction via the through-hole electrodes 20 and 20, respectively. Further, the plurality of ground electrodes 14 a are connected in the stacking direction via the through hole electrodes 21. With such a connection, the respective capacitance portions formed in the third layer L3 are connected in parallel for each center electrode 16a, and form each matching capacitance.

Further, the electrodes 8a formed on the sixth layer L6,
8c and 9b are connected to the capacitance electrodes 16d to 16d, respectively. The multilayer substrate 3 having the above structure is
It is manufactured as follows. First, a flexible ceramic green sheet is formed by, for example, extrusion molding from a slurry obtained by mixing dielectric ceramic powder and an organic binder, and cut into a predetermined size. Next, electrodes such as Cu, Pd, Pt, and Ag are patterned on the surface of a rectangular plate-shaped ceramic green sheet having a thickness of several tens of μm by printing or vapor deposition. Then, the respective dielectric sheets are laminated in the order shown in FIG. 3 or FIG. 4 and pressure-bonded, and then the laminated body is fired at a high temperature to be formed. The ceramic sheets 23 and 24 that form the convex portions 7 and 7 are also fired at the same time. As a result, the multilayer substrate 3 in which the dielectric sheet and each electrode are integrally fired is formed.

The first and second recesses 25 and 26 into which the permanent magnet 5 and the ferrite 4 are inserted may be preformed on the ceramic green sheet and then fired, or the integrally fired multilayer substrate 3 may be formed. The upper surface may be formed by cutting.

The circulator 1 thus constructed
Is completed by first assembling the lower yoke 2 and the upper yoke 6 after inserting the ferrite 4, the ground plate 27 and the permanent magnet 5 into the first and second recesses 25 and 26 of the multilayer substrate 3 in the assembly process. To do. Then, the ferrite 4 and the permanent magnet 5 have the first and second recesses 2 formed in advance.
5, 26 is automatically positioned at a predetermined position facing the center electrode 16a. Then, the permanent magnet 5 applies a DC magnetic field to the ferrite 4.

The circulator 1 of this embodiment has the following features. (1) The matching capacitor is configured by connecting in parallel a plurality of capacitor units stacked in the third layer L3 of the multilayer substrate 3. Therefore, when the required capacitance value increases, it can be dealt with by increasing the number of stacked capacitor portions. In this case, since the thickness of each dielectric sheet that constitutes the capacitance portion is about several tens of μm, even if the number of laminated layers increases, the rate at which the total thickness of the multilayer substrate 3 increases is extremely small.
Therefore, the effect of reducing the planar area of the capacitance electrodes 15a and 16b forming the capacitance portion contributes more to the miniaturization of the component.

(2) The multilayer substrate 3 is formed by patterning predetermined electrodes on the surfaces of a plurality of ceramic green sheets,
It is manufactured by integral firing. Therefore, in the above-described conventional example, the number of firing steps can be reduced and the manufacturing cost can be reduced as compared with the case where two firing steps are required.

(3) The ferrite 4 and the permanent magnet 5 are formed on the upper surface of the multilayer substrate 3 by the first and second recesses 2 formed in advance.
It is positioned simply by inserting it in 5, 26. Therefore, the ferrite or permanent magnet positioning step required in the conventional example can be substantially omitted, and the assembling step is simplified. This also makes it possible to reduce the manufacturing cost.

(4) The first recess 26 for receiving the ferrite 4 and the second recess 25 for receiving the permanent magnet 5 are coaxially and continuously formed on the upper surface of the multilayer substrate 3. Therefore, the permanent magnet 5 and the ferrite 4 are arranged close to each other. In general, since the magnetic field of the permanent magnet 5 has a shape that spreads outward, the magnetic flux becomes sparse as the distance between the magnet and the ferrite increases, and the magnetic flux becomes denser as the distance approaches. Therefore, in the configuration of this embodiment in which the permanent magnet 5 and the ferrite 4 are close to each other, the magnetic flux is dense, and even if the permanent magnet 5 having a weaker magnetic force than that of the conventional example is used, the same effect can be achieved. .

Second Embodiment The circulator according to the second embodiment is different from the first embodiment in the arrangement state of the ferrite 4 and the permanent magnet 5. That is, as shown in FIGS. 5 and 6, the circulator 50 has second recesses 55, 55 for receiving the permanent magnets 5 on the upper surface and the lower surface facing the center electrode (not shown) of the multilayer substrate 53, respectively. First recesses 56, 56 for receiving the ferrite 4 are formed. Then, the permanent magnets 5, 5 are mounted in the respective second recesses 55, and the ferrites 4, 4 are mounted in the first recesses 56 with the ground plate 27 interposed. With such a configuration, each center electrode in the multilayer substrate 53 is sandwiched by a pair of ferrites 4 from above and below, and a pair of permanent magnets 5 applies a bias magnetic field from above and below. According to such a configuration, an effect that the insertion loss can be further reduced is obtained as compared with the circulator of the first embodiment. Moreover, the effects described in the first embodiment can be obtained in the same manner.

In the first and second embodiments described above, the circulator has been described as an example of the nonreciprocal circuit element.
The configuration of the present invention can also be applied to an isolator. When it is applied to an isolator, it is realized by connecting a terminating resistor to any one lead electrode 16d of the three center electrodes 16a.

Further, in the above embodiment, the capacitance electrodes and the ground electrodes formed in the multilayer substrate 3 were connected to each other through the through hole electrodes, but instead of the through hole electrodes, the side surface of the dielectric sheet is used. An electrode may be formed on each of the electrodes and the electrodes may be connected to each other.

Modified Example In the second embodiment, the plurality of center electrodes are formed on different dielectric layers, but the plurality of center electrodes in the present invention should be formed using the same dielectric sheet. Is also possible. Such a modified example will be described with reference to FIG. 7.

The dielectric sheet 61 shown in FIG. 7 corresponds to a structure used in place of the three fifth dielectric sheets 16 shown in FIG. In the central area of the upper surface of the dielectric sheet 61, the first
Center electrode portions 62a to 67a are formed. The six first center electrode portions 62a to 67a are classified into three groups, with a pair of first center electrode portions extending parallel to each other as one group. For example, the first center electrode portion 62
a and the first center electrode portion 63a form one group, and one first center electrode portion 62a that forms one group is smaller than that of the other first center electrode portion 63a. The length has been lengthened.

Further, the pair of first center electrode portions forming each group has a fan-shaped electrode portion 6 with the center side missing.
8 to 70 electrically connected. The dielectric sheet 61 has through-hole conductive portions 71 to 73 formed therein. The through hole conductive portions 71 to 73 are formed by filling the through holes with a conductive material. The electrode parts 68 to 70 are drawn out to the lower surface of the dielectric sheet 61 by the through hole conductive parts 71 to 73.

Further, the plurality of first center electrode portions 62 are provided.
Through-hole conductive portions 74 are formed at the tips of a to 67a, respectively. On the other hand, in FIG. 7, in order to clarify the electrode shape of the lower surface, the electrode shape of the lower surface is shown by projecting downward. On the lower surface of the dielectric sheet 61, in the center,
Second center electrode portions 62b to 67b are formed. Second
Each of the center electrode portions 62b to 67b is electrically connected to the corresponding first center electrode portion via the through hole conductive portion 74 described above. For example, the second center electrode portion 6
2b denotes the first upper surface side through the through-hole conductive portion 74.
It is electrically connected to the center electrode portion 62a, thereby forming one center electrode. Similarly, the other first and second center electrode portions are also electrically connected to each other through the through-hole conductive portions to form center electrodes.

Therefore, in the modification shown in FIG. 7, each center electrode is constructed by utilizing the upper surface and the lower surface of one dielectric sheet 61, and intersects in the central region of the dielectric sheet 61. Each of the plurality of center electrodes is configured by utilizing the upper surface and the lower surface of the single dielectric sheet 61. That is, the plurality of center electrodes are not separated by the dielectric layer in the multilayer substrate.

In FIG. 7, the second center electrode portion 62
b-67b, the portion opposite to the tip portion connected to the through-hole conductive portion 74 is the ground electrode 7 formed in the periphery.
It is electrically connected to 7. Further, in the ground electrode 77, a plurality of cutouts 78 opened toward the central region are formed. Each notch 78 has a through hole conductive portion 71-73 electrically connected to the electrode portion 68-70.
And to prevent electrical connection with the ground electrode 77. The through-hole conductive parts 71 to 73 are shown in FIG.
Is electrically connected to the through-hole conductive portion 20 shown in FIG. On the other hand, the ground electrode 77, as shown by the dashed circle,
Through-hole conductive portion 21 arranged below (see FIG. 3)
Electrically connected to.

In FIG. 7, one dielectric sheet 61 is used.
Although the above-mentioned electrode structure was provided on the upper and lower surfaces of the dielectric sheet 61, the electrode structure on the lower surface side of the dielectric sheet 61 was
It may be formed on the upper surface of another dielectric sheet disposed on the lower surface of 1. That is, the electrode structure according to the present modification may be separately formed into a plurality of dielectric sheets as long as they can be connected by the through-hole conductive portion.

[0048]

As described above, according to the present invention, since the matching capacitance can be ensured by appropriately determining the number of laminated capacitor portions laminated in the multilayer substrate, the planar shape of the multilayer substrate is increased. Without increasing the capacitance value of the matching capacitance. As a result, it becomes possible to promote miniaturization of the non-reciprocal circuit device. Further, in the case of a structure in which a multi-layer substrate is formed by integrally firing a plurality of dielectrics, the multi-layer substrate can be obtained by a single firing process, so that the manufacturing process is simplified as compared with the conventional non-reciprocal circuit device. Therefore, the cost can be reduced.

Further, when the first holding portion is formed on the multilayer substrate to hold the magnetic body at a position facing the center electrode, the magnetic body can be easily positioned with respect to the center electrode. From this point, the manufacturing cost can be reduced.

Similarly, when the second holding portion is formed on the multilayer substrate to hold the magnet, the magnet and the center electrode can be easily positioned, so that the manufacturing cost can be reduced. You can

Further, when the first and second holding portions are formed by the recesses formed in the multilayer substrate, the magnetic body and the magnet can be housed without increasing the thickness of the multilayer substrate. Therefore, the dimension of the nonreciprocal circuit element in the thickness direction can be reduced, and the miniaturization of the nonreciprocal circuit element can be further promoted.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a configuration of a circulator according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the structure of the circulator shown in FIG.

FIG. 3 is an exploded perspective view showing a configuration of a multilayer substrate of the circulator of the first embodiment.

FIG. 4 is an explanatory diagram for explaining the configuration of the multilayer substrate shown in FIG.

FIG. 5 is an exploded perspective view showing a structure of a circulator according to a second embodiment of the present invention.

FIG. 6 is a sectional view showing a structure of a circulator of a second embodiment.

FIG. 7 is a perspective view for explaining a main part of a circulator of a modified example of the invention.

FIG. 8 is an exploded perspective view showing a configuration of a laminated substrate of a conventional circulator.

FIG. 9 is a sectional view showing a structure of a conventional circulator.

[Explanation of symbols]

 1, 50 ... Circulator (non-reciprocal circuit element) 2, 53 ... Multilayer substrate 4 ... Ferrite 5 ... Permanent magnet 12-16 ... Dielectric sheet 16a ... Center electrode 15a-15c, 16b ... Capacitance electrode (matching circuit electrode) 25 , 55 ... 1st holding part 26, 56 ... 2nd holding part 61 ... Dielectric sheet 62a-67a ... 1st center electrode part 62b-67b ... 2nd center electrode part 74 ... Through-hole conductive part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshikazu Kodo 2-26-10 Tenjin, Nagaokakyo, Kyoto Prefecture Murata Manufacturing Co., Ltd. (72) Hiroshi Matsui 2-26-10 Tenjin, Nagaokakyo, Kyoto Stock Murata Manufacturing Co., Ltd. (72) Inventor Keiji Ogawa 2-10-10 Tenjin, Tenjin, Nagaokakyo, Kyoto Prefecture Murata Manufacturing Co., Ltd.

Claims (18)

[Claims] 1. A multi-layer substrate in which a plurality of dielectric layers are laminated, a plurality of center electrodes formed in the multi-layer substrate, electrically insulated from each other, and further intersecting each other, A matching capacitor having a plurality of capacitor parts stacked in a multilayer substrate and connected to each of the center electrodes, a magnetic body provided so as to face the center electrode, and a DC magnetic field is applied to the magnetic body. And a magnet for the non-reciprocal circuit device. 2. The nonreciprocal circuit device according to claim 1, wherein the matching capacitor is formed at a position that does not overlap the center electrode in the thickness direction of the multilayer substrate. 3. The matching capacitance portion is composed of the dielectric layer and a pair of capacitance electrodes formed on the upper and lower main surfaces of the dielectric layer so as to face each other. The plurality of capacitance units connected to
The nonreciprocal circuit device according to claim 2, which are connected in parallel with each other. 4. The nonreciprocal circuit device according to claim 3, wherein the matching capacitance has the capacitance portion configured at a position different from the center electrode of the dielectric layer on which the center electrode is formed. 5. The non-matching capacitor according to claim 4, wherein the matching capacitor has the capacitor portion configured in the dielectric layer different from the dielectric layer in which the center electrode is formed in the multilayer substrate. Reversible circuit element. 6. The matching capacitance has the capacitance portion formed in the dielectric layer located above and / or below the dielectric layer in which the center electrode is formed in the stacking direction. Item 5. The nonreciprocal circuit device according to item 5. 7. The nonreciprocal circuit device according to claim 3, wherein the multilayer substrate is formed by integrally firing the plurality of stacked dielectric layers. 8. The multi-layer substrate has a first holding part for holding the magnetic body at a position facing the center electrode, and the magnetic body is held by the first holding part. Item 7
The nonreciprocal circuit device described in 1. 9. The nonreciprocal circuit device according to claim 8, wherein the first holding unit is a recess formed in the multilayer substrate. 10. The multilayer substrate further has a second holding portion for holding the magnet at a position facing the center electrode, and the magnet is held by the second holding portion. Item 9. The nonreciprocal circuit device according to item 8. 11. The nonreciprocal circuit device according to claim 10, wherein the second holding portion is a recess formed in the multilayer substrate. 12. The multi-layer substrate has a first holding part for holding the magnetic body at a position facing the center electrode, and the magnetic body is held by the first holding part. The nonreciprocal circuit device according to 1. 13. The multilayer substrate further has a second holding portion for holding the magnet at a position facing the center electrode, and the magnet is held by the second holding portion. The nonreciprocal circuit device described in 1. 14. The nonreciprocal circuit device according to claim 11, wherein the first and second holding portions are formed on at least one of main surfaces of the multilayer substrate which face each other. 15. The nonreciprocal circuit device according to claim 12, wherein the first and second holding portions are formed on both of the main surfaces of the multilayer substrate. 16. The nonreciprocal circuit device according to claim 1, wherein the multilayer substrate is formed by integrally firing the plurality of dielectric layers. 17. The nonreciprocal circuit device according to claim 1, wherein the plurality of center electrodes are formed at different height positions in the multilayer substrate. 18. The center electrode is formed on one dielectric layer, a first center electrode portion disposed on one surface of the dielectric layer, a second center electrode portion disposed on the other surface, and the center electrode formed on the one dielectric layer. The nonreciprocal circuit device according to claim 1, further comprising a through-hole conductive portion that electrically connects the first and second center electrode portions.