WO2004113250A1 - Ferrite ceramic composition for irreversible circuit element, irreversible circuit element, and radio unit - Google Patents

Abstract

A ferrite ceramic composition having a principal component represented by a general formula (Sr1-xBax)O n(Fe1-yIny)2O3 (0≤x≤1.0, 5.00<n≤6.00, 0<y≤0.30), or a general formula (Sr1-xBax)O n(Fe1-zAlz)2O3 (0≤x≤1.0, 5.00<n≤6.00, 0<z≤0.30), or a general formula (Sr1-xBax)O n(Fe1-y-zInyAlz)2O3 (0≤x≤1.0, 5.00<n≤6.00, 0<y≤0.30, 0<z≤0.30). An irreversible circuit element obtained using this composition can exhibit an adequate irreversibility even if it is operated at 10 GHz or less or in a microwave/millimeter wave band of 30-60 GHz while reducing magnetic loss and is suitably employed in a radio unit operating in a microwave/millimeter wave band.

Description

 Specification

 Ferrite porcelain composition for non-reciprocal circuit device, non-reciprocal circuit device, and wireless device

 The present invention relates to a ferrite porcelain composition for a nonreciprocal circuit device, a nonreciprocal circuit device, and a wireless device. In particular, the present invention relates to a microwave / millimeter wave band (hereinafter simply referred to as “microwave band”) having a frequency of several GHz to several tens GHz. Ferrite porcelain composition for non-reciprocal circuit elements suitable for use in the above), non-reciprocal circuit elements such as isolators and circulators formed using the ferrite porcelain composition, and the non-reciprocal circuit elements Wireless device. Background art

As a non-reciprocal circuit device used in a microwave band such as a mobile phone and a millimeter-wave radar, a non-reciprocal circuit device in which a permanent magnet applies a DC magnetic field has been known. The non-reciprocal circuit element uses a ganet ferrite represented by yttrium iron garnet YgF esC ^ ₂ (hereinafter referred to as “YIG”) or a spinel ferrite represented by Mg ferrite or NiCuZn ferrite. A permanent magnet such as a rare earth magnet or Sr ferrite magnet applies a DC magnetic field to drive the magnet.

 The irreversible circuit element usually uses garnet-based ferrite in the ultra-high frequency / microphone mouthband of several hundred MHz to several GHz, and spinel-based ferrite in the microwave band of several tens of GHz.

 In other words, garnet-based ferrite has a large magnetic loss peak on the low magnetic field side in the ultra-high frequency or microwave band of several hundred MHz to several GHz, so that an irreversible circuit element with low magnetic loss cannot be obtained. It is driven on the higher magnetic field side than the ferromagnetic resonance peak.

On the other hand, spinel ferrite is used in the microwave band of several tens of GHz, and is generally driven at a lower magnetic field than the ferromagnetic resonance peak. That is, in the microphone mouthband of several 10 GHz, since the ferromagnetic resonance peak and the low magnetic field loss peak are sufficiently separated, a nonreciprocal circuit having a sufficiently low magnetic loss even when driven at a low magnetic field. It is difficult to sufficiently saturate the spinel ferrite (saturation magnetization of about 0.4 T) with a permanent magnet, and it is driven at a lower magnetic field than the ferromagnetic resonance peak. . Then, when a magnetic field is generated, the high-frequency magnetic field generates a right-handed circularly polarized wave and a left-handed negative circularly polarized wave in the direction of the DC magnetic field. A non-reciprocal circuit element is realized by utilizing such properties, which are different for circularly polarized waves and negatively circularly polarized waves.

 That is, the complex permeability ^ of ferrite is expressed by equation (1), the real part ^ 'represents the response of magnetization, and the imaginary part ^ 〃 represents magnetic loss.

 11 = ― L… (1)

 Since the real part 'of the complex permeability shows the response of magnetization, the permeability difference Δ / (= 1) between the real part ^ of the circular polarization permeability + and the real part of the negative circular polarization ^ ) Is irreversible. Therefore, the properties of ferrite are evaluated by the absolute permeability difference II and the imaginary part of circularly polarized permeability +. be able to.

 By the way, in mobile phones used in the microwave band of several GHz, there is a demand for further reduction in the height, size, and cost of devices. Miniaturization and cost reduction are being demanded.

 However, garnet-based ferrite requires a permanent magnet to apply a DC magnetic field, and thus limits the reduction in height, size, and cost of nonreciprocal circuit devices.

 In the microwave band of several 10 GHz, small wireless LANs with non-reciprocal circuit elements are expected to be used, such as millimeter-wave radars.However, spinel ferrite is used for the non-reciprocal circuit elements. In this case, permanent magnets are required as in the case of garnet-based ferrite, and there are limits to the reduction in height, size, and cost of nonreciprocal circuit devices.

On the other hand, B a Ferrite (B a O, 6 F e 2 0 3) and S r ferrite (S r O · 6 F e 2 〇 ₃₎ or the like hexagonal magnetoplumbite of having uniaxial magnetic anisotropy Non-reciprocal circuit elements of the self-piase type using byte ferrites have also been known. The irreversible circuit element of the self-bias operation type, for example, B a ferrite, 1. Have 4 0 X 1 0 ⁶ AZM anisotropy field H a, also, S r ferrite, 1. 5 4 since it has an anisotropic magnetic field H a of X 1 0 ⁶ a / m, and with the driven magnetic anisotropy field H a without requiring a permanent magnet to generate a magnetic field.

 As described above, the self-biasing operation type nonreciprocal circuit element using magnetoplumbite ferrite does not require a permanent magnet for applying a magnetic field such as garnet ferrite / spinel ferrite. Taller and smaller size-Promising in terms of cost reduction.

 As such a self-biased non-reciprocal circuit device that does not require a permanent magnet, an isolator (non-reciprocal circuit device) is mounted together with a semiconductor chip in a microwave integrated circuit or a microwave circuit module in a surface mount format. A technology has been proposed (Japanese Patent Laid-Open No. 11-17408).

 However, conventional irreversible circuit elements of self-biased operation cannot obtain sufficient irreversibility in the microphone mouthband below 10 GHz, and in the microwave band of 30 to 60 GHz. However, due to the large magnetic loss, there was a problem that it was not suitable for use in these microwave bands.

Figure 1 is positive negative circularly polarized magnetic permeability ^ each permeability components _± of S r ferrite as an example of a magnetoplumbite ferrite ^,, H- ', shows the frequency characteristic. The horizontal axis represents the frequency (GHz;), and the vertical axis represents the magnetic permeability components of the positive and negative circular polarization magnetic permeability _± ', β ₊ , li-.

 FIG. 2 shows the magnetic permeability difference Δ ^ when Sr ferrite is used for a self-biased nonreciprocal circuit device. The horizontal axis is frequency (GHz), and the vertical axis is magnetic permeability difference.

 As is clear from FIGS. 1 and 2, in the microwave band of 10 to 30 GHz, it is possible to drive on the higher magnetic field side than the ferromagnetic resonance peak, and 60 to 200 GHz. In the microphone mouthband, it can be driven on the lower magnetic field side than the ferromagnetic resonance peak.

However, as shown in FIG. 1, in the microwave band of 30 to 60 GHz, the imaginary part / of the circularly polarized magnetic permeability greatly increases from the threshold value of 0.05. As a result, the magnetic loss increases, and a low-loss nonreciprocal circuit device cannot be obtained.

 On the other hand, as shown in FIG. 2, in the microwave band of 10 GHz or less, the permeability difference Δ is as small as less than 0.1, so that desired irreversibility cannot be obtained.

 That is, the conventional self-biased irreversible circuit element cannot obtain the desired irreversibility in the microwave band of 10 GHz or less, while the magnetic loss increases in the microphone mouthband of 30 to 60 GHz. There was a problem.

 The present invention has been made in view of such a problem, and it is possible to obtain sufficient irreversibility even when used in a microphone mouthband of 10 GHz or less or 30 to 60 GHz. It is another object of the present invention to provide a ferrite porcelain composition for a nonreciprocal circuit element capable of reducing magnetic loss, a self-biased nonreciprocal circuit element manufactured using the ferrite porcelain composition, and a wireless device. And Disclosure of the invention

The present inventors have made intensive studies to achieve the above object, a portion of the F e ^{3 +} contained in Magunetopura Nbaito type hexagonal ferrite by a child substituted with I n ^3+, anisotropic The magnetic field Ha can be controlled in a decreasing direction, thereby improving the irreversibility of the ferrite porcelain composition in a microwave band of 10 GHz or less, and further reducing the frequency of the ferromagnetic resonance peak to a low frequency. It has been found that it is possible to suppress the magnetic loss in the microphone mouthband of 30 to 60 GHz.

That is, the ferrite ceramic composition for a non-reciprocal circuit element according to the present invention (hereinafter, simply referred to as "ferrite ceramic composition") of the general formula _{{(S r ,. x B a} x) 〇 · η (F e ,. , it contains _{a. z I n y) 2 0} 3} (0≤x≤ 1. 00, 5. 00≤n <6. 00, 0 <y≤0. main component represented by 3 0) It is characterized by:

According to the ferrite ceramic composition formula _{{(S r ,. x B a} x) 〇 · n (F

I n _y ) ₂ 〇 ₃ } (0≤x≤1.00, 5.00≤n <6.00, 0 <y≤0.30), so 10 GH The desired irreversibility can be obtained even in a microphone mouthband of 30 GHz or less or 30 to 60 GHz, and a ferrite porcelain composition with small magnetic loss can be obtained. In the microwave band of 30 to 60 GHz, irreversibility has been good (see Fig. 1 and Fig. 2), but there has been a drawback that the magnetic loss is large.

Therefore, the present inventors have conducted intensive studies and found that the anisotropic magnetic field Ha can be controlled in the increasing direction by substituting a part of the above-mentioned F e ^{3 +} with A 13 ^+. As a result, the frequency of the ferromagnetic resonance peak can be shifted to the higher frequency side, and as a result, it has been found that the magnetic loss can be suppressed without impairing the irreversibility even in the microwave band of 30 to 60 GHz. .

That is, the ferrite ceramic composition according to the present invention have the general formula _{{(S r ,. x B a} x) O • n (F e, _ z A 1 z) 2 0 3} (0≤x≤ 1. 00 , 5.00≤n <6.00, 0 <z≤0.30).

According to the ferrite ceramic composition formula _{{(S r ,. x B a} x) 〇 _{· η (F e (. Z} A 1 z) 2 0 3} (0≤x≤ 1. 00, 5. 00≤n <6.00, 0 <z≤0.30), so that magnetic loss can be reduced even in the microwave band of 30 to 60 GHz, and such frequency Even in the band, a ferrite porcelain composition having good irreversibility and low magnetic loss can be obtained.

In addition, as a result of further intensive studies by the present inventors,? 6 ^{3 +} part is 111 ^{3 +} and 8 1 ³

It has been found that by substituting with +, it is possible to obtain a ferrite porcelain composition tuned to have the desired irreversibility and low magnetic loss in the microwave band of 10 GHz or less or 30 to 60 GHz. .

That is, the ferrite ceramic composition according to the present invention have the general formula _{{(S r ,. x B a} x) 〇 _{• n (FI n y A 1} z) 2 0 3} (0≤x≤ 1. 00, 5 It is characterized by containing the main components represented by .00≤n <6.00, 0 <y≤0.30, 0 <z≤0.30).

According to the ferrite ceramic composition formula _{{(S Γ ,. Χ Β a} x) _{〇. · N (F e ,. y} _ Z I n y A 1 z) 2 〇 _{3} (0≤x≤} 1.00, 5.00≤n <6.00, 0 <y≤0.30, 0 <z≤0.30) In addition to the above effects, The saturation magnetization Ms can be varied while suppressing the variation of the anisotropic magnetic field Ha.This makes it possible to control the ferromagnetic resonance peak and the difference in magnetic permeability. Even with desired irreversibility and low magnetic loss The ferrite porcelain composition can be easily obtained.

 By the way, in non-reciprocal circuit devices, the shorter the distance between the permanent magnet and the ferrite porcelain composition, the worse the transmission characteristics due to the influence of the eddy current loss generated in the permanent magnet. This eddy current is more likely to be generated as the resistivity P of the permanent magnet is smaller. In addition, in the self-bias type non-reciprocal circuit device, the effect of the eddy current loss is very large because the ferrite ceramic composition itself generates a magnetic field. Therefore, it is necessary to reduce the eddy current loss in order to avoid the deterioration of the transmission characteristics in the self-biased irreversible circuit element, and it is necessary to increase the resistivity / 0 of the ferrite porcelain composition. . As a result of extensive studies by the present inventors, at least one of the Ca component and the Co component was added in a total amount of 0.001 to 0.8 mol per 1 mol of the main component. By adding the total content of the Mn component and the Zr component in the ferrite porcelain composition in a range of 1.5% by weight or less in terms of oxide, the specific resistance | 0 It has been found that it can be increased.

 That is, the ferrite porcelain composition of the present invention contains at least one of the Ca component and the Co component as an accessory component, and the content of the Ca component and the Co component is less than 1 mol of the main component. On the other hand, it is characterized in that it is contained in a total amount of 0.001 to 0.8 mol, and contains at least one of the Mn component and the Zr component as a sub-component, It is characterized in that the content of the Zr component is less than or equal to 1.5% by weight (not including 0% by weight) in terms of oxides.

 According to the ferrite porcelain composition, 0.001 to 0.8 mol of at least one of the Ca component and the Co component as subcomponents is contained with respect to 1 mol of the main component, Since at least one of the Mn component and the Zr component is contained in a total of not more than 1.5% by weight (excluding 0% by weight) in terms of oxides, specific resistance As a result, it is possible to obtain a ferrite porcelain composition having a large ratio of 10 and thereby reduce the effect of eddy current loss generated in the permanent magnet of the nonreciprocal circuit device. A reversible circuit element can be obtained. A non-reciprocal circuit device according to the present invention is characterized by including a ferrite member formed of the ferrite porcelain composition.

According to the above irreversible circuit element, even in the microphone mouthband of several GHz to several 10 GHz, It is possible to obtain an irreversible circuit element having desired irreversibility, small magnetic loss, low dielectric loss tan «5, and large specific resistivity | 0. In addition, since the ferrite porcelain composition can be driven by using the anisotropic magnetic field Ha, a permanent magnet is not required, and the size, height, and cost can be reduced.

 A wireless device according to the present invention includes the non-reciprocal circuit device.

 According to the wireless device, since the above-mentioned irreversible circuit element is provided, the magnetic loss is small in the microwave band of several GHz to several 10 GHz, the desired irreversibility is obtained, and Miniaturization equipped with a self-bias type nonreciprocal circuit element with low loss tan δ and high specific resistivity ρ ・ To obtain wireless devices such as mobile phones and millimeter-wave radars with reduced height and cost Becomes possible. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a diagram showing frequency characteristics of each magnetic permeability component of the complex magnetic permeability of a conventional Sr ferrite. FIG. 2 is a diagram showing a frequency characteristic of a permeability difference Δ of a conventional Sr ferrite. FIG. 3 is a diagram schematically showing a frequency characteristic of a magnetic permeability difference of the ferrite porcelain composition according to the present invention. FIG. 4 is a diagram showing the half-width of magnetic resonance of the ferrite porcelain composition according to the present invention. FIG. 5 is a perspective view showing a first embodiment of the nonreciprocal circuit device according to the present invention. FIG. 6 is a front view (a) and a plan view (A-A view) of a main part of a nonreciprocal circuit device according to a second embodiment of the present invention. FIG. 7 is a perspective view showing a third embodiment of the nonreciprocal circuit device according to the present invention. FIG. 8 is a perspective view showing a fourth embodiment of the nonreciprocal circuit device according to the present invention. FIG. 9 is a perspective view showing a fifth embodiment of the nonreciprocal circuit device according to the present invention. FIG. 10 is a perspective view showing a sixth embodiment of the nonreciprocal circuit device according to the present invention. FIG. 11 is a plan view showing a seventh embodiment of the nonreciprocal circuit device according to the present invention. FIG. 12 is a perspective view showing an eighth embodiment of the nonreciprocal circuit device according to the present invention. FIG. 13 is a perspective view showing a ninth embodiment of the non-reciprocal circuit device according to the present invention. FIG. 14 is a system configuration diagram showing an embodiment of the wireless device according to the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

 Next, embodiments of the present invention will be described in detail.

 The ferrite porcelain composition according to the first embodiment of the present invention is represented by the following general formula [A].

(S r! _ _X B a _x ) 0 · η (F e ^ I n _y ) ₂ 0 ₃ … [A]

 Where x is 0≤x≤l. 0, n is 5.00≤n <6.00, y is 0 and y≤0.30.

That is, the ferrite ceramic composition of the first embodiment, the general formula (S Γ,., Β, ) Ο · nF e 2 〇 ₃ (and伹, 0≤χ≤1. 0) magnet represented by In the pravant-type ferrite, part of Fe ^{3 +} was replaced with In ³⁺ .

The reason why part of Fe ^{3 +} was replaced with In ³⁺ in this manner is as follows.

Magneto In ferrite, but it is generating more magnetic fields that drive the anisotropic magnetic field Ha, the experimental result of the present inventors, the replacement of over portion of 6 ^{3 +} in 1 n ³⁺ As a result, it was found that the anisotropic magnetic field Ha can be controlled in the decreasing direction. For example, if the Fe component of the magnetoplumbite-type Ba ferrite is replaced by the In component, the anisotropic magnetic field Ha becomes the anisotropic magnetic field of Ba ferrite itself (1.40 X 10 ⁶ (A / m )). At this time, the saturation magnetization Ms also fluctuates in the decreasing direction.

 On the other hand, the internal magnetic field Hin is expressed by equation (2), and the frequency ω (= 27C fr) of the ferromagnetic resonance peak is expressed by equation (3).

 Hin = Ha-NXMs… (2)

 ω = τ XHin… (3)

Here, N is a demagnetizing field coefficient, Ms is a saturation magnetic field (T), and a is a gyro constant (= 2.21 × 10 ⁵ m / A · s).

 Therefore, since the internal magnetic field Hin also fluctuates appropriately according to the variation of the anisotropic magnetic field Ha and the saturation magnetic field Ms according to the equation (2), the frequency ω of the ferromagnetic resonance peak also varies according to the equation (3).

The decrease in the anisotropic magnetic field Ha reduces the frequency of the ferromagnetic resonance peak. ω fluctuates, and as a result, as shown in FIG. 3, the frequency characteristic of the magnetic permeability difference Δ between the real part of the circular polarization and the negative circular polarization is In addition, the characteristics can be changed to those shown by the solid line, and a ferrite porcelain composition having sufficient irreversibility can be obtained even when used in a microwave band of 10 GHz or less. It is known that the imaginary part ^ + "indicating the magnetic loss becomes a mono-Lentz distribution curve with respect to the internal magnetic field H in (= ω / Ύ) as shown in FIG. By changing H in, the half-width Δ 値 of the magnetic resonance peak can be reduced, and at the same time, the frequency ω of the ferromagnetic resonance peak can be shifted to a lower frequency side, and as a result, the imaginary part can be reduced. It is possible to suppress the magnetic loss at 30 to 60 GHz.

It should be noted that the present invention While we have confirmed that in cowpea to replace a portion of the F e ^{3 +} in Sn ⁴⁺ is possible to also obtain the same work for effect, F e ^{3 +} part because if you substituted by S n ^{4 +} collapse charge balance, while it is necessary to charge correcting a divalent metal elemental such Z n ²⁺ and C u ^2+, I n since ions are trivalent, Fe ^{3 +} a is also not collapse the charge balance substituted with I n ^3+, thus there is no need to charge compensation divalent metal element.

 In the above general formula (A), y is set to 0 <y≤0.30. When y exceeds 0.30, the content of In becomes excessive while the content of Fe becomes large. This is because the amount becomes too small to show magnetic anisotropy and cannot be used as a non-magnetic material.

 Also, in the above general formula [A], n is set to 5.00≤n <6.00 because when n is out of this range, no magnetic anisotropy is exhibited, and a different phase is precipitated or This is because it becomes difficult to obtain a sufficient saturation magnetization Ms and the resistivity p decreases.

 And the said ferrite porcelain composition is manufactured as follows.

That is, a barium compound, a strontium compound, an iron compound, and an indium compound as a ferrite raw material are appropriately weighed and mixed so that the component composition of the final product, a ferrite porcelain composition, has a predetermined molar ratio, and the mixture is prepared using a pole mill. After wet mixing, the mixture is calcined in the air, and then wet pulverized to produce a calcined powder. Then This calcined powder is kneaded with a binder resin to form a slurry, dehydrated and formed in a magnetic field, and then fired in the air, thereby producing a ferrite porcelain composition represented by the general formula (A). .

Ferrite ceramic composition thus first embodiment, since the F e ^{3 +} part of magnetoplumbite pi preparative ferrite is substituted with I n ^3+, of 10 GHz or 30 to 60 GHz In the microwave band, a ferrite porcelain composition having desired irreversibility, small magnetic loss and suitable for irreversible circuit elements can be obtained.

 Next, a ferrite porcelain composition according to a second embodiment of the present invention will be described in detail. The ferrite porcelain composition according to the second embodiment is represented by the following general formula [B].

(S r to _X B a _x ) O · n (F e ^ A 1 _z ) ₂ 〇 ₃ … [B]

 Where x is 0≤x≤l. 0, n is 5.00≤n <6.00, and z is 0 <z≤0.30.

That is, the ferrite ceramic composition of the second embodiment, the general formula _{(S r x B a x)} O · nF e 2 〇 ₃ (however, 0≤χ≤1. 0) magnet Prabang preparative represented by In the type ferrite, part of Fe ^{3 +} is replaced with A 13 ⁺ .

The reason why part of F e ^{3 +} was replaced with A 13 ⁺ in this manner is as follows.

The magnetoplumbite-type ferrite as described above, but by generating a magnetic field by driving kinematic anisotropic magnetic field Ha, the experimental result of the present inventors, F e ^{3 +} of the part A 1 ^{3 It was found} that the substitution with ⁺ can shift the frequency ω of the ferromagnetic resonance peak to a higher frequency side. That is, also in the second embodiment, by replacing a part of Fe ^{3 +} with A 13 ⁺ , the half width ΔΗ of the magnetic resonance peak is reduced as in the first embodiment. And the frequency ω of the ferromagnetic resonance peak can be shifted to a higher frequency side. As a result, the imaginary part in the microwave band of 30 to 60 GHz can be reduced, and the magnetic loss can be suppressed.

In other words, conventional magnetoplumbite-type ferrites such as Br ferrite and Sr ferrite can satisfy irreversibility in the microwave band of 30 to 60 GHz, but have the disadvantage of large magnetic loss. However, in the second embodiment, By substituting part of F e ^{3 +} with A 13 ⁺ , it is possible to suppress magnetic loss even in the microwave band of 3060 GHz, and achieve both irreversibility and low magnetic loss. A ferrite porcelain composition can be obtained.

 In the above general formula (B), z is set to 0 and z≤0.30 because when z exceeds 0.30, the content of A 1 becomes excessive while the content of Fe becomes Is too small to exhibit magnetic anisotropy and cannot be used as a non-magnetic material.

 The ferrite porcelain composition of the second embodiment also uses an aluminum compound instead of an indium compound for the ferrite raw material, and uses the above general formula by a method and procedure substantially similar to those of the first embodiment. The ferrite porcelain composition represented by [B] can be easily produced.

 Next, a ferrite porcelain composition according to a third embodiment of the present invention will be described in detail.

 The ferrite porcelain composition according to the third embodiment is represented by the following general formula [C].

_{(S r X B a x)} O · n (F e,. Y. Z I n y A 1 z) 2 〇 ₃ [C]

 However, x is 0≤x≤l. 0 n is 5.00≤n <6.00. Also, y and z are respectively 0 <y≤0.30 and 0 <z≤0.30.

That is, in the third embodiment, and replacing the chromatography of 6 ^{3 +} at 111 ³⁺ and eight 1 ^{3 +} bi how.

The reason why a part of F e ^{3 +} is substituted with both In ³⁺ and A 13 ⁺ in this way is as follows.

Some of the F e ³⁺ by replacing I n ^3+, can be controlled anisotropy field H a, as described above, A 1 part of F e ³⁺ In addition to this By replacing with ³⁺ , it is possible to change the saturation magnetization M s while suppressing the fluctuation of the controlled anisotropic magnetic field Ha, thereby making it possible to change the ferromagnetic resonance peak dependent on the saturation magnetization Ms. It is easy to fine-tune the frequency ω (see the above formulas (2) and (3)) and the magnetic permeability difference Δ //, so that the desired irreversibility and It becomes easy to obtain a ferrite porcelain composition having low magnetic loss. In the general formula (C), y and z are respectively set to 0 <y≤0.30 and 0 <z≤0.30, because when y and z both exceed 0.30, In and This is because while the content of A 1 is excessive, the content of Fe is too small, so that it does not show magnetic anisotropy and cannot be used as a non-magnetic material.

The ferrite porcelain composition of the third embodiment also uses a barium compound, a strontium compound, an iron compound, an indium compound, and an aluminum compound as a ferrite raw material, and is substantially the same as the method of the first embodiment. · The ferrite porcelain composition represented by the general formula [C] can be easily produced by the procedure. As described above, in this third embodiment, since the F e ^{3 +} part of magnetoplumbite ferrite are replaced with I n ³⁺ and A 1 ^3+, micro 100112 Ya 30 to 60 GHz In the wave band, a ferrite porcelain composition having desired irreversibility, small magnetic loss, and suitable for irreversible circuit elements can be obtained.

 In the above-described manufacturing process, impurities such as Mn, Cl, Ni, Zn, Mg, S, Ca, Cr, and Bi may be mixed at less than 0.4% by weight. At the time of mixing, impurities such as Zr and Si may be mixed at less than 0.8% by weight, but this does not affect the characteristics of the present invention.

 Further, the ferrite porcelain composition of the present invention is not limited to the above embodiment, and at least one of the Ca component and the Co component is represented by the general formulas (A) to (C). It is also preferable that the total amount is 0.001 to 0.8 mole per 1 mole of the main component.

In this case, the ferrite porcelain composition is represented by the following general formulas [D] to [F]. (S r preparative _x B a _x) 〇 · η (F e preparative _{y I n y) 2 0 3} + o; C a +] 3 C o ... [D]

(S r preparative _{x B a x) O - n} (F e preparative _{Z A 1 Z) 2 0 3} + o; C a +] S Co- [E]

(S r,. _X B a _x ) O 'n (F e _yz I n _y A 1 _z ) ₂ 0 ₃ + a C a + j8 C o ... [F] where α and 3 are the general formulas [ It is the number of moles of the added Ca component and Co component with respect to 1 mole of the main component represented by D) to [F], and satisfies the following formula [G]

In non-reciprocal circuit devices, the shorter the distance between the permanent magnet and the ferrite porcelain composition, The transmission characteristics are deteriorated due to the influence of the eddy current loss generated in the permanent magnet. This eddy current is more likely to occur as the specific resistivity! 0 of the permanent magnet decreases. In addition, in the self-bias type non-reciprocal circuit device, since the ferrite porcelain composition itself generates a magnetic field, the influence of eddy current loss is very large.

 However, according to the research results of the present inventors, by adding a predetermined amount of the Ca component and / or the Co component so as to satisfy the above general formula (G), a ferrite porcelain having a large specific resistivity / 0 can be obtained. It has been found that a composition can be obtained, whereby the eddy current loss of the self-bias type nonreciprocal circuit element can be reduced, and deterioration of the transmission characteristics can be avoided.

 Here, the reason why the molar content of the Ca component and the Co component, ie, [3], satisfies the above formula [G] is as follows.

 That is, if the total amount of β and the molar amount of the Ca component and the Co component per 1 mol of the main component is less than 0.001 mol, the addition of the Ca component and / or the Co component is performed. This is because the effect of increasing the specific resistance P cannot be obtained, the signal transmission loss is large, and the transmission characteristics are degraded.In addition, the total molar amounts of the Ca component and the Co component and β If it exceeds 0.8 mol, the specific resistivity ρ tends to decrease, the signal transmission loss increases, and the transmission characteristics may be deteriorated.

 Further, in the ferrite porcelain compositions of the above general formulas [] to [F], the content of the Mn component and the Zr component is 1.5% by weight or less (including 0% by weight) in terms of oxide. By adding the Mn component and the Zr component so as to satisfy the above, the specific resistance p can be increased and the dielectric loss tan δ can be reduced. In particular, in the general formulas [D] to [F], the content of the Mn component and the Zr component is adjusted to be 1.5% by weight or less (not including 0% by weight), whereby the Ca component is obtained. It is possible to obtain a larger resistivity p in combination with the effect of adding the Co component and the Co component.

In this case, the Mn component may be contained in the sintered body that is the main component, or the Mn compound may be added to the sintered body. In any case, the Mn component and Zr component in the ferrite porcelain composition must be less than 1.5% by weight (excluding 0% by weight) in terms of oxides. By adjusting so that the dielectric loss tan <5 is low, the specific resistivity ιθ A large ferrite porcelain composition can be obtained, whereby further low eddy current loss can be achieved with a self-bias type non-reciprocal circuit device, and good transmission characteristics can be obtained.

 In particular, since Mn has a plurality of valences per element, it is possible to adjust the charge balance, and it is particularly preferable to obtain a high-resistance magnetoplumbite ferrite.

 If the total content of the Mn component and the Zr component exceeds 1.5% by weight in terms of oxide, the dielectric loss tan <5 or the specific resistivity ί) may be reduced. When adding the Mn component or the Zr component, it is necessary to control the content so that the total content is 1.5% by weight or less.

 Next, a nonreciprocal circuit device using the ferrite porcelain composition will be described. FIG. 5 is a perspective view schematically showing a lumped constant type circuit as one embodiment (first embodiment) of the non-reciprocal circuit device according to the present invention.

 The lumped constant type circuit is formed such that the microstrip lines 1a, lb, and lc cross each other at an interval of 120 ° C., and these microstrip lines 1a, 1b The upper and lower surfaces of 1 c are in contact with a ferrite substrate 3 formed of the ferrite ceramic composition via an insulator layer 2. A capacitor (not shown) is attached to the terminal portions 1 & ', lb', and lc 'of the microstrip lines la, lb, 1 (, and the resonance frequency is determined by the inductance of the ferrite substrate 3 and the capacitor. I am adjusting.

 In the first embodiment, for example, when a current is applied to the microstrip line 1a, a uniform rotating magnetic field is applied to the ferrite substrate 3 by a cross circuit formed by the microstrip lines 1a, lb, and lc. Is formed. And, since the microwave ferrite 3 is formed of the above ferrite porcelain composition, the magnetic loss is small in a microwave band of 10 GHz or less or 30 to 60 GHz and has sufficient irreversibility. You will be able to get a night out. In addition, since the ferrite porcelain composition is driven by the anisotropic magnetic field Ha, it is possible to reduce the size, height, and cost of the circulator without using an external magnetic field such as a permanent magnet. Can be.

FIG. 6 (a) shows a strip line Y connection as a second embodiment of the nonreciprocal circuit device. Fig. 6 (b) is a view along arrow A-A in Fig. 6 (a). In the second embodiment, the branch paths 4a, 4b, and 4c of the strip line 4 are joined in a Y-shape at a circular center 4d, and the branch paths 4a, 4b , 4c are provided with correction capacitor sections 5a, 5b, 5c. Ferrite substrates 6 are provided on both upper and lower surfaces of the center portion 4d, and external conductors are provided on upper and lower surfaces of the branch paths 4a, 4b, 4c so that the ferrite substrate 6 is sandwiched. 7a and 7b are provided.

 And, for example, TM. When resonating in the mode, the high-frequency magnetic field input to the branch path 4a rotates the polarization plane as shown by the arrow when passing through the ferrite substrate 6, and is output only to the branch path 4b. To form

 Also in the second embodiment, since the ferrite substrate 6 is formed of the ferrite porcelain composition, the magnetic loss is small enough in a microwave band of 10 GHz or less or 30 to 60 GHz. It will be possible to obtain an irreversible compact and low-profile and low-cost Sirki Yure overnight.

 FIG. 7 shows a ferrite substrate circulator as a third embodiment of a non-reciprocal circuit device. A Y-shaped strip line 10 is formed on the surface of a ferrite substrate 9. Then, in the third embodiment, for example, TM ^ as in the second embodiment. In the case of resonance in the mode, the high-frequency magnetic field input to the branch 10a rotates on the ferrite substrate 9 and is output only to the branch 10b to form a short circuit.

 Also in the third embodiment, since the ferrite substrate 9 is formed of the above-described ferrite porcelain composition, the magnetic loss is small in a microwave band of 10 GHz or less or 30 to 60 GHz, and sufficient It is possible to obtain a reversible, compact, low-profile and low-cost circuit.

FIG. 8 is a perspective view schematically showing a waveguide circulator as a fourth embodiment of the nonreciprocal circuit device. In the fourth embodiment, a Y-shaped waveguide 1 is used. A cylindrical pillar 12 is inserted into the center of the Y-branch of FIG. 1, and operates in substantially the same manner as in the second and third embodiments to form a circuit. Since the ferrite column 12 is formed of the above ferrite porcelain composition, the In the lower and 30 to 60 GHz microwave bands, it is possible to obtain a compact, low-profile and low-cost circuit that has a small magnetic loss and sufficient irreversibility. 9) is a perspective view schematically showing a non-radiative dielectric line Y-type circuit as a fifth embodiment of the non-reciprocal circuit device. FIG. 9 (b) is a perspective view of FIG. 9 (a). It is B sectional drawing. In FIG. 9A, a pair of upper and lower metal plates is omitted. In the fifth embodiment, the dielectric strips 13a, 13b, and 13c are 120 at regular intervals. And a pair of disk-shaped ferrite substrates 14a, 14b are sandwiched by one end of the dielectric strips 13a, 13b, 13c, and further, the dielectric strips 13a, 13b , 13c and the ferrite substrates 14a, 14b are provided with flat metal plates 15a, 15b on both upper and lower surfaces. Then, a resonator is constituted by the ferrite substrates 14a and _14b , and resonates in the _ΗΕ11δ mode.

 Also in the fifth embodiment, since the ferrite substrates 14a and 14b are formed of the above-described ferrite ceramic composition, the magnetic loss is small and sufficiently irreversible in the microwave band of 10 GHz or less or 30 to 60 GHz. It is possible to obtain a circulator with a small size and a low profile and low cost.

 FIG. 10 is a perspective view schematically showing a Faraday rotary isolator as a sixth embodiment of a non-reciprocal circuit device, wherein the Faraday rotary isolator is a ferrite rod inserted through a supporting dielectric 16. 17 and resistor plates 18 a and 18 b are accommodated in a waveguide 19.

Then, for example, the input signal of the TE ₁₀ mode from the direction of arrow C is converted to TEu mode by square one circular transducer 20 a. Since the electric field of the input signal is perpendicular to the resistance plate 18a, it is not absorbed and reaches the ferrite rod 17 and is decomposed into positive and negative circularly polarized waves, and the magnetic permeability difference Δ between the positive and negative circularly polarized waves Δ Is the difference in the phase constants, and the plane of polarization rotates by an angle 0. As a result, the input signal that has passed through the ferrite rod 17 becomes parallel to the resistor plate 18b, and the input signal is absorbed.

On the other hand, the input signal of the TE _1Q mode from the direction of arrow D is converted to the TE ^ mode by the square-circular converter 20b. And the electric field of the input signal is perpendicular to the resistance plate 18b. Therefore, it reaches the ferrite rod 17 without being absorbed, and is decomposed into positive and negative circularly polarized waves, and the plane of polarization rotates by an angle of 0. The input signal that has passed through the ferrite rod 17 is perpendicular to the resistor plate 18a and is output from the waveguide 19, thereby forming an isolation in the direction of arrow D.

 Also in the sixth embodiment, since the ferrite rod 17 is formed of the ferrite porcelain composition, the magnetic loss in the microwave band of 10 GHz or less or 30 to 60 GHz is reduced. It is possible to obtain a small, low-profile and low-cost isolator having a small enough irreversibility.

 FIG. 11 is a perspective view schematically showing a peripheral mode type isolation as a seventh embodiment of the nonreciprocal circuit device. The seventh embodiment is characterized in that the ferrite porcelain composition A substantially trapezoidal strip line 22 is formed on the surface of the ferrite substrate 21 made of a material, and a resistance is further applied to the surface of the ferrite substrate 21 so that a part of the strip line 22 overlaps the end of the strip line 22. The body 23 is formed.

 Then, when a high-frequency signal is input to the terminal 24a, the high-frequency magnetic field propagates through one end of the strip line 22 to the output side as shown by the arrow E due to the Faraday effect, and proceeds to the terminal 24b. Output from On the other hand, when a high-frequency signal is input to the terminal 24b, the high-frequency signal is twisted in the direction of the resistor 23 and proceeds, and the high-frequency signal is absorbed by the resistor 23, thereby forming an isolator.

 Also in the seventh embodiment, since the ferrite substrate 21 is formed of the ferrite porcelain composition, the magnetic loss is small in the microwave band of 10 GHz or less or 30 to 60 GHz. It is possible to obtain a compact, low-profile and low-cost isolator with sufficient irreversibility.

 12 (a) and 12 (b) are perspective views schematically showing a waveguide resonant isolator as an eighth embodiment of the nonreciprocal circuit device, wherein the ferrite rods 26a to 26c are The rectangular waveguide 25 is inserted at a predetermined position.

This In the eighth embodiment, the fundamental mode of the waveguide 2 5, i.e., when propagating in TE _{1 Q} mode, the high frequency magnetic field rotating at a specific position, the circularly polarized wave. Circular polarization includes positive circular polarization and negative circular polarization. When one circular polarization, for example, positive circular polarization acts as a large magnetic loss, the other circular polarization, for example, negative Circularly polarized wave is attenuated Pass without.

 Therefore, as shown in FIGS. 12 (a) and 12 (b), an isolator can be formed by inserting ferrite rods 26a to 26c at specific positions where circular polarization occurs.

 Also in the eighth embodiment, since the ferrite rods 26a to 26c are formed of the above ferrite porcelain composition, the magnetic loss is small and sufficiently irreversible in the microwave band of 10 GHz or less or 30 to 60 GHz. It is possible to obtain an isolator that has small size, low profile, and low cost.

 FIG. 13 shows a cross strip line resonance type isolator as a ninth embodiment of the nonreciprocal circuit device.

 In the ninth embodiment, the ground conductors 27a and 27b are formed on one surface of the dielectrics 29a and 29b, and a cylindrical ferrite column 28 is provided at a substantially central portion of the dielectric 29. It is buried, and the strip line 30 is sandwiched between the dielectrics 29a and 29b. The strip line 30 has a matching capacitor portion 31 and a λ / 4 resonator 32 is formed on the strip line 30 so as to be able to contact the ferrite column 28. In the ninth embodiment, a circularly polarized wave is generated at the intersection of the strip line 30 and the λ / 4 resonator 32, so that an isolator is formed according to the same operation principle as in FIG.

 Also in the ninth embodiment, since the ferrite column 28 is formed of the above ferrite porcelain composition, the magnetic loss is small in the microwave band of 10 GHz or less or 30 to 60 GHz, and sufficient irreversibility is obtained. It is possible to obtain an isolator having a small size, a low profile, and a low cost.

 FIG. 14 is a system configuration diagram showing one embodiment of the wireless device according to the present invention, in which 31 is the isolator shown in FIGS. 10 to 13, and 32 is the circuit device shown in FIGS. One night.

That is, when the modulated signal is input to the voltage controlled signal (Voltage Controlled 0 scillator: VCO) 33, the wireless signal is input to the power bra 34 via the isolator 31, and the modulated signal is The modulated signal is divided into one night 32 and the mixer 36, and the modulated signal input to the circuit 32 is transmitted from the antenna 35. You.

 On the other hand, the received signal input to the antenna 35 is input to the mixer 36 via the circulator 32, and is mixed with the modulated signal from the power bra 34, and the reception frequency is lowered to obtain an IF signal (Intermediate Frequency). Have gained. In the present embodiment, since the above-described isolator and circuit are used, even in a mobile phone used in several GHz band or a wireless LAN / millimeter wave radar used in several tens GHz band, magnetic loss is reduced. It is possible to obtain a wireless device that is small and has sufficient irreversibility and that can be reduced in size and height and cost.

 Next, examples of the present invention will be specifically described.

 Example 1

The general formula having the composition shown in Table 1 {S r O · n ( F e ,. y I n y) 2 0 3} ferrite ceramic composition represented by was prepared.

That, S r C_〇 ₃ as ferrite raw materials (strontium carbonate), F e ₂ 0 ₃ (iron oxide), prepared I n ₂ 0 ₃ (indium oxide), these ferrite raw materials, 0. 00≤Y ≤0.31, n = 5.50, weighed and mixed, wet-mixed with a ball mill, calcined in air, and then wet-milled to obtain a temporary surface area of about 5m ² Zg. Baked powder was prepared.

Next, the calcined powder is kneaded with a butyl acetate-based binder to form a slurry. The slurry is subjected to dehydration molding in a magnetic field, and then fired in the air to produce a sintered body, which is represented by the general formula (SrO'n ( The ferrite ceramic compositions of sample numbers 1 to 6 represented by F e ,. _{y Iny} ) ₂ { ₃ } were obtained.

 Next, the saturation magnetization Ms and the anisotropic magnetic field Ha of each of these samples were measured, and the relationship between frequency and complex permeability was simulated based on the measured saturation magnetization Ms and the anisotropic magnetic field Ha. The permeability difference (irreversibility) at 10 GHz and 10 GHz and the imaginary part of the circularly polarized complex permeability (magnetic loss) were determined.

 Here, the saturation magnetization Ms was measured with a VSM (sample vibration type magnetometer).

The anisotropic magnetic field Ha was determined as follows. That is, first, using a network analyzer, the magnetic resonance frequency fr of a sample having a known demagnetizing factor N was measured without an external magnetic field, and the anisotropic magnetic field Ha was calculated based on Equation (4). 27T fr = r (Ha-NMs)-(4)

Where ァ is the gyro constant (= 2.21 X 10 ⁵ m / A · s).

 Furthermore, the specific resistance | 0 was measured by a four-terminal method using a high resistance measuring instrument.

 Table 1 shows the composition of each sample number, the saturation magnetization Ms, the anisotropic magnetic field Ha, the specific resistance p, the permeability difference Δ, and the imaginary part ^ ′.

(Hereinafter the margin)

SrO-nCFe! -Yln gOg Sample Permeability difference Imaginary part

 No. (irreversibility) (magnetic loss)

 n Saturated magnetization Ms Anisotropic magnetic field Ha Specific resistivity / 0 y (T) (kAZm) Δ / i, '(Ω.cm)

 10GHz 40GHz 10GHz 40GHz

1 * 0.00 5.5 0.360 1536 4.99 0 0.96 1.2X10 ¹⁰

2 0.05 5.5 0.350 1200 0.14 -2.21 0 0.19 3.5 10 ¹⁰

3 0.15 5.5 0.300 570

-0.55 0.41 0 2.2 X10 ¹⁰

4 0.25 5.5 0.150 310 -0.33 -0.22 0 0 7.5X10 ¹⁰

5 0.30 5.5 0.110 100 -0.22

0 0 5.5X10 ¹⁰

6 * 0.31 5.5 0 0 0 0 0 0 6.0X10 ¹⁰ Note) * is outside the scope of the present invention p

 O

〇

Sample No. 1 is a conventionally used Sr ferrite (anisotropic magnetic field Ha: 1536 kAZm). At 10 GHz, the magnetic permeability difference △ is as small as 0.05 «0.1. Irreversibility cannot be obtained. At 40 GHz, the imaginary part is 0.96 (≥0.05), indicating high magnetic loss.

 In sample No. 6, since y was 0.31 and exceeded 0.30, the content of Fe was too low, and the anisotropic magnetic field was `` 0 '', indicating no irreversibility. Natsu

 On the other hand, in sample numbers 2 to 5, since y is 0, y≤0.30, and n is 5.50, the anisotropic magnetic field Ha is lower than that of the conventional Sr ferrite (sample number 1). As a result, the absolute magnetic permeability difference II becomes at least 0.1 at 10 GHz and / or 40 GHz to obtain a desired irreversibility, and the imaginary part ^ ′ is also 0. It becomes less than 05, and magnetic loss can be reduced.

 That is, for sample Nos. 4 and '5, the desired irreversibility can be obtained with the absolute permeability difference I ΔI of 0.1 or more at both 10 GHz and 40 GHz, and the imaginary part is also 0. As a result, it is possible to obtain a non-reciprocal circuit device that can be used in both microwave bands without magnetic loss.

 In sample number 2, the imaginary part ^ + 〃 was 0.19 at 40 GHz, which was 0.05 or more, and the magnetic loss was large.However, at 10 GHz, the imaginary part 'was 0 and the magnetic loss was 0. At 10 GHz, the absolute permeability difference II is 0.14 (> 0.1), and the desired irreversibility can be obtained.

 Also, in sample No. 3, the imaginary part 〃 is 0.41 and is not less than 0.05 at 10 GHz, so the magnetic loss is large.However, at 40 GHz, the imaginary part t + 〃 is 0 and the magnetic loss is 0. Does not occur, and at this 40 GHz, the absolute permeability difference II is also 0.55 (> 0.1), so that desired irreversibility can be obtained.

 Example 2

In a similar manner and procedure as Example 1, a ferrite ceramic composition represented by the general formula having the composition shown in Table 2 {S rO 'n (F e t _ z A 1 z) 2 0 3} Object was produced. That, S r C_〇 ₃ (strontium carbonate) as ferrite raw materials, F e ₂ 〇. (Iron oxide), prepared A 1 ₂ 0 ₃ (aluminum oxide), these ferrite MotoHara The ingredients are weighed and mixed so that 0.000≤z≤0.31, n = 5.50, wet-mixed with a pole mill, calcined in air, and then wet-pulverized. A calcined powder having a specific surface area of about 5 m ² Z g was prepared.

Next, the calcined powder is kneaded with a vinyl acetate-based binder to form a slurry. The slurry is subjected to dehydration molding in a magnetic field, and then fired in the air to produce a sintered body. ^ was obtained a 1 _{z) 2} 0 ₃ ferrite ceramic composition of sample No. 1 1-15 represented by}.

 Next, for each of these samples, the saturation magnetization Ms, the anisotropic magnetic field Ha, and the resistivity p were measured in the same manner as in [Example 1], and based on the measured saturation magnetization Ms and the anisotropic magnetic field Ha, each was measured. The permeability difference Δ (irreversibility) at 10 GHz and 4 OGHz of the sample and the imaginary part (magnetic loss) of the circularly polarized complex permeability were determined.

 Table 2 shows the composition of each sample number, saturation magnetization Ms, anisotropic magnetic field Ha, resistivity ί), permeability difference Δ ^, and imaginary part ^ '.

(Hereinafter, margin)

Table 2

Note) * is outside the scope of the present invention

Sample No. 11 is a Sr ferrite (anisotropic magnetic field Ha: 1 536 kA / m) that has been used conventionally, as in Sample No. 1 (Example Table 1). The difference is as small as 0.05 (0.1), and the desired irreversibility cannot be obtained. At 40 GHz, the imaginary part is 0.96 (≥0.05), and the magnetic loss is large.

 Sample No. 15 has z of 0.31, which exceeds 0.30, and therefore the content of Fe is too small, so that the anisotropic magnetic field becomes `` 0 '', indicating irreversibility. It is gone.

 On the other hand, in sample Nos. 12 to 14, since z is 0 <z≤0.30, the anisotropic magnetic field Ha can be increased compared to the conventional Sr-fluorite (sample No. 11). However, the frequency of the ferromagnetic resonance peak shifts to the high frequency side, and as a result, the imaginary part ^ + な る becomes zero. At 10 GHz, the absolute magnetic permeability difference II is less than 0.1 and irreversibility cannot be obtained, but at 40 GHz, the absolute magnetic permeability difference I ΔI is 0.1 or more, indicating that there is no sufficient non-reversibility. Reversibility can be obtained. That is, in the microwave band of 40 GHz, a ferrite porcelain composition having good irreversibility and no magnetic loss was obtained.

 Example 3

Method similar to Example 1, the procedure, formula having the composition shown in Table 3 {(S r preparative _x B a _x) 〇 · η (F e preparative _{yz I n y A 1 ζ)} 2 A ferrite porcelain composition represented by { ₃ } was prepared.

That, S r C0 ₃ as ferrite raw materials (strontium carbonate), B aC 〇 ₃ (barium carbonate), F e ₂ 〇 ₃ (iron oxide), I n ₂ 〇 ₃ (indium oxide), A 1 ₂ 〇 ₃ ( Aluminum oxide), and prepare these ferrite raw materials, 0≤χ≤1.00, 0.000≤y≤0.31, 0.000≤z≤0.31, 4.90≤n≤ The mixture was weighed so as to be 6.00, wet-mixed with a pole mill, calcined in the air, and then wet-pulverized to produce a calcined powder having a specific surface area of about 5 m ² Zg.

Next, the calcined powder is kneaded with a vinyl acetate-based binder to form a slurry.The slurry is subjected to dehydration molding in a magnetic field, and then fired in the air to produce a sintered body, which has the general formula {(Sr ,. _x B a _x) 〇 _{· n (FI n y A 1} z) 2 〇 _3} sample No. 21 represented by ~ 38 ferrite porcelain compositions were obtained.

 Next, for each of these samples, the saturation magnetization Ms, the anisotropic magnetic field Ha, and the resistivity <o were measured in the same manner as in [Example 1], and based on the measured saturation magnetization Ms and the anisotropic magnetic field Ha. The permeability difference △ a (irreversibility) at 10 GHz and 40 GHz of each sample, and the imaginary part ^ ′ (magnetic loss) of the circularly polarized complex permeability were determined.

 Table 3 shows the composition of each sample number, the saturation magnetization Ms, the anisotropic magnetic field Ha, the specific resistivity ιθ, the magnetic permeability difference Δ; and the imaginary part ^.

(Hereinafter, margin)

Table 3

(Sr-, _ _x Ba _x ) O 'n (Fe―_ _z In _y Al _z ) ₂ 0 ₃

 Permeability difference imaginary part 3

 Sample

 No. Saturation magnetization Ms Anisotropic magnetic field Ha (irreversibility) (Magnetic loss

 X y z n

 (T) (kA / m) Δ / H, loss,) resistivity jO

 (Ω.cm)

10GHz 40GHz 10GHz 40GHz

21 * 0 0.00 0.00 5.5 0.360 1536 0.05 4.99 0 0.96 1.2 10 ¹⁰

22 0 0.15 0.05 5.5 0.289 930 0.26 -0.73 0.01 0 2.5X10 ¹⁰

23 0 0.15 0.20 5.5 0.113 2002 0.01 0.17 0 0 3.5X10 ^1D

24 0 0.15 0.30 5.5 0.110 2200 0.01 0.12 0 0 5.0X 10 ¹¹

25 * 0 0.15 0.31 5.5 0 0 0 0 0 0 4.5X10 ¹¹

26 * 0 0.31 0.31 5.5 0 0 0 0 0 0 3.5X10 ¹⁰

27 0.10 0.12 0.05 5.5 0.235 810 0.29-0.51 0.01 0 8.1 10 ¹⁰

28 0.20 0.12 0.06 5.5 0.225 800 0.28-0.48 0.01 0 7.0X 10 ¹⁰

29 0.40 0.13 0.05 5.5 0.230 820 0.26 -0.50 0.01 0 6.8X10 ¹⁰

30 0.80 0.13 0.05 5.5 0.231 800 0.29-0.49 0.01 0 5.4X10 ¹⁰

31 1.00 0.12 0.06 5.5 0.233 790 0.30-0.49 0 0 9.2X 10 ¹⁰

32 * 0.20 0.30 0.30 4.9 0 0 0 0 0 0 8.5X10 ⁶

33 0.20 0.13 0.13 5.5 0.221 770 0.31-0.45 0.01 0 7.7X10 ⁷

34 0.20 0.12 0.13 5.4 0.226 890 0.21 -0.57 0 0 9.5X10 ⁷

35 0.20 0.13 0.13 5.5 0.233 900 0.21-0.60 0 0 1.0X 10 ¹⁰

36 0.20 0.13 0.12 5.6 0.234 950 0.18 -0.67 0 0.01 2.5X10 ¹¹

37 0.20 0.13 0.12 5.9 0.241 810 0.30-0.51 0.01 0.02 8.1 10 ⁹

38 * 0.20 0.13 0.13 6.0 0.220 600 0.10 one 0.35 0.10 0.12 5.4X10 ⁶ Note) * marked is outside the scope of the present invention

Sample No. 21 is a conventionally used Sr ferrite (anisotropic magnetic field Ha: 1536 kAZm). At 10 GHz, the magnetic permeability difference △ is as small as 0.05 050.1) and the desired non- No reversibility can be obtained. At 40 GHz, the imaginary part 'is 0.96 (≥0.05), and the magnetic loss is large.

 In Sample No. 25, y was 0.31, and in Sample No. 26, y and z were 0.31 and exceeded 0.30. The magnetic field became “0” and showed no irreversibility.

In sample No. 32, since n was 4.90 and was less than 5.00, the anisotropic magnetic field Ha became “0”, indicating no irreversibility, and the specific resistivity! 5 x 10 ⁶ Ω · cm.

In sample No. 38, since n was 6.00, the anisotropic magnetic field Ha became “0”, indicating no irreversibility, and the specific resistance iO was 5.4 × 10 ⁶ Ω · cm. It was small.

 On the other hand, in sample numbers 22 to 24, 27 to 31, and 33 to 37, y and z are 0 <y≤0.30, 0 <z≤0.30, and n is 5.00≤n <6, respectively. Since the absolute magnetic permeability difference II is 0.1 or more in at least one of 10 GHz and 40 GHz, the desired irreversibility can be obtained, and the imaginary part + "is also less than 0.05. As a result, the magnetic loss can be reduced.

 In other words, for sample numbers 22, 27 to 31, and 33 to 37, the desired irreversibility can be obtained because the absolute magnetic permeability difference I ΔI is 0.1 or more at both 10 GHz and 40 GHz. Since the imaginary part / ζ ′ is also less than 0.05, the magnetic loss is small, and it is possible to obtain a non-reciprocal circuit element that can be used in both microphone mouthbands. In Sample Nos. 23 and 24, the absolute permeability difference II was less than 0.1 at 10 GHz, and the desired irreversibility could not be obtained.However, the absolute permeability difference II was 0.1 at 40 GHz. As described above, it can be seen that desired irreversibility can be obtained, and that the imaginary part also becomes 0 and no magnetic loss occurs.

Then, I eta ³⁺ and A 1 ^{3 +} content molar amount of, that is, by a suitably adjusted child y and z, both 10 GHz and 40 GHz as in Sample No. 22, 27-31, and 33-37 Ferrite that can achieve both irreversibility and low magnetic loss A porcelain composition can be obtained.

 Example 4

Formula having the composition shown in Table _{4 {(S r, - X} B a x) O 'n (F e ,. y z I n y A 1 z.) 2 〇 _{3 + o; Ca + ^ Co} } ferrite A porcelain composition was prepared.

That is, substantially the same manner as Example 1, using the procedure, S r C_〇 ₃ of the ferrite raw materials (strontium carbonate), B a C0 ₃ (barium carbonate), F e ₂ 〇 ₃ (oxidation iron), I n ₂ 0 ₃ (indium oxide), a 1 ₂ 0 ₃ (as aluminum oxide) is x = 0. 2, n = 5. 5, y = 0. 13, z = 0. 13抨量was formulated, after wet mixing using a ball mill, calcined in the air, the general formula _{{(S r ,. x B a} x) 〇 · n (F e ^ I n y a l z ) to prepare a calcined powder represented by ₂ 0 _3}.

Then, to the calcined powder (principal component) 1 mol, C AC0 ₃ (calcium carbonate), and the content of CoO (cobalt oxide) is then added to a 0 to 0.9000 moles in total, wet This was ground to prepare a calcined and ground product having a specific surface area of about 5 m ² Zg. Next, the calcined and pulverized product is kneaded with a vinyl acetate-based binder resin to form a slurry. to obtain a S r preparative _X B a _x) 〇 · n (F e ^. n y a l z) 2 〇 ₃ + _cuC a + j3 ferrite ceramic composition of the sample No. 41-69, represented by Co}.

 Next, as in [Example 1], the saturation magnetization Ms of each sample, the anisotropy field Ha, the permeability difference Δ (irreversibility) at 10 GHz and 40 GHz, and the imaginary part of the circularly polarized complex permeability '(Magnetic loss) and specific resistivity / 0 were determined.

 Furthermore, each sample was mounted on the non-radiative dielectric line Y-type circuit shown in Fig. 7, and the signal transmission loss (insertion loss I. L) was measured using a network analyzer.

Table 4 shows the composition of each sample, the saturation magnetization Ms, the anisotropic magnetic field Ha, the permeability difference Δ, the imaginary part ₊ 〃, the specific resistivity / □, and the insertion loss IL.

(Hereinafter, margin) Table 4

In each of sample numbers 41 to 69, since x, y, z, and n are within the range of the present invention, the absolute irreversibility can be obtained by the absolute magnetic permeability difference II being 0.1 or more. The imaginary part + "is also less than 0.05, so that the magnetic loss can be reduced.

However, Sample No. 4 1, 42, 49, 5 6, 6 5 (α + / 3) for value of 0.0 0 less than 1, the specific resistivity? 0 1. ⁹ X 1 0 9 ~ 2 . small as ^{8 X 1 0 10 Ω · cm} , the insertion loss I L. also 1.0 6:. 1. increases the 24 dB.

Further, Sample No. 48, 5 5, 6 0, 64, 6-9 (a + / 3) for value exceeds 0.8, the resistivity ratio ιθ is 1. 6 X 1 0 ⁹ to 2. 9 X 10 ^{1 ()} Ω · cm or less, and the insertion loss I.L. is 1.06 to: L. 59 dB, which is large.

In contrast, sample numbers 43 to 47, 50 to 55, 57 to 59, 61 to 63, and 66 to 68 have (α +) 3) values of 0, Since it is within the range of 0.80, the specific resistance P is 4.5 × 10 ^{1 (up} to 1.8 × 10 ¹³ Ωcm, and the input loss I.L. 46 to 0.99 dB, and it is possible to obtain a ferrite porcelain composition capable of increasing the specific resistance p and reducing the insertion loss IL.

Example 5

In a similar manner and procedure as Example 4, the general formula having the composition shown in Table 5 {(S r ^ B a χ) 〇 · η (FI n _{y) 2} 〇 _{3 + a C a +) 3} C o } (x = 0, n = 5.5, 0≤y≤0.31, = β = 0.25) Ferrite ceramic compositions of sample numbers 71 to 76 were prepared.

 Further, as a comparative example, a ferrite porcelain composition to which Ca and Co were not added was prepared.

 Next, as in Example 1, the saturation magnetization Ms of each sample, the anisotropy field Ha, the permeability difference Δ (irreversibility) at 10 GHz and 4 O GHz, and the circularly polarized complex transmittance The imaginary part of magnetic susceptibility ^ '(magnetic loss) and resistivity p were determined.

 Table 5 shows the composition of each sample number, the saturation magnetization Ms, the anisotropic magnetic field Ha, the magnetic permeability difference Δ, the imaginary part ′, and the specific resistivity 0.

(Hereinafter, margin) Table 5

(Sr _x Ba _x ) 0 "n (Fe-, _ _v In _y ) _z 0 ₃ + Of Ca + Co

 Permeability difference Ajw Imaginary part jt + "Resistivity / 0 sample Saturated magnetic anisotropy (irreversibility) (magnetic loss) (Q-cm)

 No. Xy n Ms Magnetic field Ha

 (T) (kA / m) 10 GHz 40 GHz 10 GHz 40 GHz Example

 Comparative example (α = β = 0.25)

71 * 0 0.00 5.5 0.346 1525 0.04 4.98 0 0.97 2.1 Χ10 ¹³ 1.2Χ10 ¹⁰

72 0 0.05 5.5 0.336 1180 0.13 2.20 0 0.20 6.2Χ10 ¹³ 3.5Χ10 ¹⁰

73 0 0.15 5.5 0.286 555 2.93 0.55 0.41 0.01 3.7Χ10 ¹³ 2.2 10 ¹⁰

74 0 0.25 5.5 0.134 290 0.32 0.21 0 0.01 1.5Χ10 ¹⁴ 7.5Χ10 ¹⁰

75 0 0.30 5.5 0.095 90 0.22 0.13 0 0.01 9.6Χ10 ¹³ 5.5Χ10 ¹⁰

76 * 0 0.31 5.5 0 0 0 0 0 0.01 1.0Χ10 ¹⁴ 6. 6.10 ¹⁰

* Indicates outside the scope of the present invention

In sample No. 71, the Ca component and the Co component were added to the conventional Sr ferrite, and at 10 GHz, the absolute permeability difference II was as small as 0.04, and the desired irreversibility could not be obtained. . At 40 GHz, the imaginary part 0 is 0.97 (≥0.05), and the magnetic loss increases.

 In sample No. 76, since y was 0.31 and exceeded 0.30, the content of Fe was too small, and the anisotropic magnetic field was also set to “0”, indicating irreversibility. No longer shown.

 Also, as is clear from the sample numbers 71 to 76, when 0.25 mol of each of the Ca component and the Co component was added, the specific resistance p was dramatically increased as compared with the case where no Ca component and Co component were added. I understand.

 Example 6

Method similar to Example 4, the procedure, formula having the composition shown in Table _{6 {(S Γ ι. Χ} Β a x) 〇 _{· n (F e ,. z A} 1 z) 2 0 3 + a C a + j8 Co} (x = 0, n = 5.5, 0 ≤ z ≤ 0.31, α = β = 0.25) Sample No. 8 Ferrite ceramic composition of 1 to 85 Was prepared.

 As a comparative example, a ferrite porcelain composition to which Ca and Co were not added was prepared.

 Next, as in [Example 4], the saturation magnetization Ms of each sample, the anisotropy field Ha, the permeability difference △ a at 10 GHz and 40 GHz (irreversibility), and the circularly polarized complex permeability were calculated. The imaginary part '(magnetic loss) and the resistivity P were determined.

 Table 6 shows the composition of each sample number, the saturation magnetization Ms, the anisotropic magnetic field Ha, the magnetic permeability difference Δ, the imaginary part '′, and the specific resistance p.

(Hereinafter, margin) Table 6

— Al _z ) ₂ 0 ₃ + (XC + βθο

 Permeability difference 〃 Imaginary part JU + "Resistivity ο

 Sample Saturated magnetic anisotropy (irreversible) (magnetic loss) (Q-cm)

 No. X zn Ms Magnetic field Ha

 (T) (kA / m) 10 GHz 40 GHz 10 GHz 40 GHz Example

 (ία = β = 0.25) Comparative example

81 * 0 0.00 5.5 0.346 1525 0.04 4.98 0 4.97 2. 1 10 ¹³ 1.2Χ10 ¹⁰

82 0 0.05 5.5 5 0.337 1785 0.06 0.59 0 0.01 5.6x 10 ¹³ 3.2 10 ¹⁰

83 0 0.10 5.5 5 0.314 2140 0.03 0.28 0 0.01 5.3Χ10 ¹³ 3.1 X 10 ^1Q

84 0 0.30 5.5 0.117 3030 0.01 0.10 0 0.01 5.4 Χ10 ¹³ 3.1 10 ¹⁰

85 * 0 0.31 5.5 0 3885 0 0 0 0.01 6.5 Χ10 ¹³ 3.8X10 ¹⁰

* Indicates outside the scope of the present invention

Sample No. 81 was obtained by adding Ca and Co components to a conventional Sr ferrite, and at 10 GHz, the absolute magnetic permeability difference I ΔI was as small as 0.04, indicating the desired irreversibility. I can't get it. At 40 GHz, the imaginary part 4. is 4.97 (≥ 0.05), and the magnetic loss increases.

 In sample No. 85, z is 0.31, and since it exceeds 0.30, the content of Fe is too small, and the anisotropic magnetic field is also `` 0 '', which is irreversible. Will not show any sexuality.

 Also, as is clear from Sample Nos. 81 to 85, the specific resistance p was significantly increased by adding 0.25 mol of each of the Ca component and the Co component, as compared with the comparative example in which the Ca component and the Co component were not added. It can be seen that the number increases.

 Example 7

By the same method and procedure as in [Example 4], the general formula having the composition shown in Table 6 ((S r ^ B a _χ ) 〇 · η (F e, _{.y .z} I n _y A 1 _z ) _{20 3} + a C a + j3 C o} (x = 0, 5.0 ≤ n ≤ 6.0, 0 ≤ z ≤ 0.31, 0 ≤ z ≤ 0.31, = = 0.25) The ferrite porcelain compositions of sample numbers 91 to 108 represented by are prepared.

 Further, as a comparative example, a ferrite porcelain composition to which Ca and Co were not added was prepared.

 Next, as in [Example 4], the saturation magnetization Ms of each sample, the anisotropy field Ha, the permeability difference Δ (irreversibility) at 10 GHz and 4 O GHz, and the circularly polarized complex permeability The imaginary part of magnetic susceptibility (magnetic loss) and resistivity ρ were determined.

 Table 7 shows the composition of each sample number, the saturation magnetization Ms, the anisotropic magnetic field Ha, the magnetic permeability difference Δ, the imaginary part, and the specific resistivity ιθ.

(Hereinafter, margin) Table 7

* Indicates outside the scope of the present invention

Sample No. 91 is obtained by adding the Ca component and the Co component to the conventional Sr ferrite.At 10 GHz, the absolute magnetic permeability difference IΔζI is as small as 0.04, and the desired irreversibility can be obtained. Can not. At 40 GHz, the imaginary part 4. is 4.98 (≥ 0.05), and the magnetic loss increases.

 In sample No. 95, z was 0.31 and exceeded 0.30, so the Fe content was too low, and the anisotropic magnetic field also became `` 0 '', indicating irreversibility. Disappears.

 In sample No. 96, both y and z are 0.31, and since it exceeds 0.30, the content of Fe is too small, and the anisotropic magnetic field is also “0”, which is irreversible. Will not be shown.

 In sample numbers 102 and 108, n was 4.9 or 6.0, and the value of n was out of the range of 5.0≤n <6.0. Disappears.

 Also, as is clear from Sample Nos. 91 to 108, when 0.25 mol of each of the Ca component and the Co component was added, the specific resistance p was significantly increased as compared with the comparative example in which no Ca component and Co component were added. I understand.

 Example 8

 By the same method and procedure as in [Example 1], ferrite porcelain compositions having compositions as shown in Table 8 were produced.

That, S r C_〇 as ferrite raw materials ₃ (strontium carbonate), B aC 0 ₃ (barium carbonate), Fe ₂ 0 ₃ (iron oxide), I n ₂ 0 ₃ (indium oxide), A 1 ₂ 〇 ₃ ( Aluminum oxide) and weigh so that x = 0.10, 0.1 l≤y≤0.13, 0.04≤z≤0.06, 5.50≤n≤5.60 The mixture was wet-mixed with a pole mill and calcined in the air. Then, the Mn O and Z r 0 ₂ was added a predetermined amount of the calcined product, the specific surface area by wet grinding to prepare a calcined powder of about 5 m ² Zg.

Next, the calcined powder was kneaded with a vinyl acetate-based binder to form a slurry. The slurry was dehydrated and formed in a magnetic field, and then fired in the air to produce a sintered body. formula containing components _{{(S ri _ x B a} x) 〇 _{· η (F e,. y} . z I n y a 1 ζ ) Was obtained ₂ 0 ₃ ferrite ceramic composition of Sample No. 1 1 1-122 represented by}. Next, as in [Example 1], the specific resistivity P, the permeability difference Δ (irreversibility) at 10 GHz and 40 GHz of each sample, and the imaginary part of the circularly polarized complex permeability ^ '(magnetic Loss), and the dielectric loss tan δ was measured by the perturbation method.

 Table 8 shows the composition of each sample number, the magnetic permeability difference Δ, the imaginary part ', the dielectric loss tan δ, and the specific resistivity Ρ.

(Hereinafter, margin)

Table 8

(Sr— _x Ba _x ) O ■ n (Fe, — _y — JnyAl _z ) ₂ 0 ₃

Sample Permeability difference Imaginary part

 No. Mn Zr Mn + Zr (irreversible) (magnetic loss) Specific resistivity / 0

X y z n

 d (% by weight) (% by weight) tano (Ω.cm)

 10GHz 40GHz 10GHz 40GHz

 M C

111 0.1 0.12 0.05 5.50 0.00 0.05 0.05 0.28 -0.50 0.01 0 8 x 10 ^1-4 3.6X10 ¹¹

112 0.1 0.12 0.06 5.50 0.50 0.04 0.54 0.25 -0.46 0.01 0 2 X 10 ~ ⁴ 5.8X10 ¹¹

113 0.1 0.13 0.05 5.50 0.90 0.02 0.92 0.26 -0.49 0.01 0 1 10 " ⁴ 6.8X 10"

114 0.1 0.13 0.05 C 5 I.50 1.10 0.06 1.16

One 0.49 0.01 0 2X10 " ⁴ 5.5X10 ¹⁰

115 0.1 0.12 0.06 5.5 1.47

o0 0.03 1.50 0.30 -0.48 0 0 9X10-4 8.1 10 ⁹

116 0.1 0.13 0.05 5.50 1.50 0.02 1.52 0.29 -0.46 0 0 25X10-- ⁴ 6.5X10 ⁶

117 0.1 0.11 0.04 5.50 0.20 0.01 0.21 0.27 one 0.51 0.01 0 6 × 10 one ⁴ 4.5 × 10 "

118 0. 1 0.05 5.60 0. 20 0.20 0.40 0.23 -0.45 0 0 2X10 one ⁴ 5.5 × 10 "

119 0.1 0.11 0.04 ``

5.50 0.30 0.60 60 0.90 0.27 one 0.47 0 0 1 X10— ⁴ 4.5X 10 ¹¹

 O

120 0.1 0.13 0.04 5.50 0.20 1.00 1.20 0.26 one 0.50 0.01 0 1 10 ~ ⁴ 7.5X10 ¹⁰

121 0.1 0.12 0.06 5.50 0.02 1.2 0.29 -0.49 0.01 0 10X10 ^-4 7.0 10 ⁹

122 0.1 0.12 0.05 0.20 1.48 1.68 0.29 -0.47 0.01 0 30X10-- ⁴ 5.5X10 ⁶

Sample No. 116, the total content of Mn component and Z r component 1. Ri 52 wt% Dea, because it exceeds 1. 50% by weight, the dielectric loss tan0 is as large as 25 X 10- ^4, The The specific resistivity io is also as small as 6.5 × 10 ⁶ Ω · cm.

Further, Sample No. 122, the total content of Mn component and Z r component is 1.68% by weight, because it exceeds 1. 50% by weight, the dielectric loss tan0 as large as 30 X 10 one ^4, Also, the specific resistance p is as small as 5.5 × 10 ⁶ Ω · cm.

On the other hand, for sample numbers 11 1 to 115 and 117 to 121, Mn and Zr components were added when the total content of the Mn and Zr components was 1.50% by weight or less. since it is, the dielectric loss tanS is 1. 0 X 10- ⁴ or less and small, the specific resistivity io also greatly summer and ^{8. 1 X 10 9 ~6. 8} X 10 · cm. Moreover, at 10 GHz and 40 GHz, the desired irreversibility can be obtained when the absolute magnetic permeability difference I ΔI is 0.1 or more, and the imaginary part ^ ′ is less than 0.05 to reduce magnetic loss. We found that it could be suppressed.

 Example 9

In a similar way * procedure as Example 4, the general formula having the composition shown in Table _{9 {(S r, _ x} B a χ) 〇 _{· η (F e ,. y.} Z I n y A 1 z) ₂ 0 ₃ + a C a + jS C o} (x = 0, 5.0 ≤ n ≤ 6.0, 0 ≤ z ≤ 0.31, 0 ≤ z ≤ 0.31, a = j3 = 0.25 ) is represented by, and to produce a predetermined amount of Mn_〇 (manganese oxide) and Z R_〇 ₂ (ferrite ceramic composition of the sample No. 132 to 142 with the addition of zirconium oxide).

 Next, as in [Example 4], the permeability difference Δ (irreversibility) of each sample at 10 GHz and 40 GHz, the imaginary part of the circularly polarized complex permeability + ”(magnetic loss), and the specific resistance The drag ratio P was determined.

 Table 9 shows the composition of each sample, the magnetic permeability difference Δ, the imaginary part + ”, and the specific resistivity p.

(Hereinafter, margin) Table 9

In sample numbers 131 to 142, since x, y, z, and n are within the range of the present invention, the absolute irreversibility can be obtained by obtaining an absolute magnetic permeability difference II of 0.1 or more, and an imaginary part ^ 'Is also less than 0.05, so that the magnetic loss can be reduced.

However, in sample numbers 136 and 142, the total contents of the Μη component and the Zr component were 1.52% by weight and 1.68% by weight, respectively, and exceeded 1.50% by weight. p is 1. l X l O ^ Q 'cm, 9.5 x 10 ⁹ Ω • cm

On the other hand, in sample numbers 131 to 135 and 137 to 141, in addition to the Ca component and the Co component, the Mn component and the Zr component were added in a total range of not more than 1.50% by weight. , specific resistance ιθ is 1. was found to increase ^{2 X 1 0 13 ~ 1. l} X 1 0 15 Q 'cm and Fei thermocline manner. Industrial applicability

 As described in detail above, the ferrite porcelain composition of the present invention can obtain sufficient irreversibility even when used in a microwave band of 10 GHz or less or 30 to 60 GHz, and can reduce magnetic loss. Since it can be used, it is useful for circulators and isolators used in these microwave bands, and for wireless devices equipped with these circulators and isolators.

Claims

The scope of the claims

1. General formula {(S r ^ B a _x ) 〇 η (Fe ^ I n _y ) ₂ 〇 ₃ } (0≤x≤ 1.00, 5.00≤n <6.00, 0 <y≤ 0.33) A ferrite porcelain composition for a non-reciprocal circuit device, characterized by containing a main component represented by the following formula:

2. General formula {(S r ,. _x B a _x ) 〇 n (F e ^ .A 1 _z ) ₂ 0 ₃ } (0≤x≤l. 00, 5.00≤n <6.00, A ferrite porcelain composition for a nonreciprocal circuit device, characterized by containing a main component represented by 0 <z≤0.30).

3. General formula {(S r, _ _x B a _x ) 〇 n (F e, „ _y _ _z I n _y A 1 _z ) ₂ 0 ₃ } (0≤x≤l. 00, 5.00≤ A ferrite ceramic composition for a non-reciprocal circuit device, comprising a main component represented by n <6.00, 0 <y≤0.30, 0 <z≤0.30).

 4. The ferrite porcelain composition for a non-reciprocal circuit device according to any one of claims 1 to 3, comprising at least one of a Ca component and a Co component as an accessory component, A ferrite porcelain composition for a non-reciprocal circuit device, wherein the total content of the Ca component and the Co component is 0.001 to 0.8 mol per 1 mol of the main component.

 5. The ferrite porcelain composition for a non-reciprocal circuit device according to any one of claims 1 to 4, comprising at least one of a Mn component and a Zr component as a sub-component, A ferrite porcelain composition for a non-reciprocal circuit device, characterized in that the total content of Mn component and Zr component is not more than 1.50% by weight (not including 0% by weight) in terms of oxide.

 6. A non-reciprocal circuit device comprising a ferrite member formed of the ferrite porcelain composition for a non-reciprocal circuit device according to any one of claims 1 to 5.

7. A wireless device comprising the non-reciprocal circuit device according to claim 6.