JP2000295057A - Two-terminal layer noise filter for high frequency and ferrite material for two-terminal layer noise filter for high frequency - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a two-terminal layer noise filter which makes <=100 MHz signal pass at a low loss and attenuates 0.5 to 5 GHz noise well. SOLUTION: This noise filter is formed so that a resistance component R in 500 MHz frequency can be >=100 times as large as a resistance component R in 100 MHz. Also, the filter is composed of 45 to 49 mol% Fe2O3, 9 to 13 mol% CuO, <=8 mol% ZnO, 0.1 to 1.5 mol% CoD and/or CoO 4/3: and :35 to 45 mol% NiO as main components and includes one, two or more among Bi2O3, PbO and V2O5 as sub components which is 0.7 to 5 wt.% in total.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated monolithic two-terminal noise filter using ferrite and a ferrite material for a high-frequency two-terminal laminated noise filter using a ferrite for noise suppression in a low-loss high-frequency transmission circuit or the like. .

[0002]

2. Description of the Related Art Since a noise filter preferably has a high attenuation effect at a frequency at which noise is to be removed, it is desirable to have a high impedance at that frequency.
A choke coil is often used as such a noise filter. Since the impedance of a choke coil generally has a property of increasing in proportion to the frequency, a large impedance is obtained at a high frequency. Generally, the noise frequency band is higher than the signal frequency band,
The above-described characteristic of the choke coil that the impedance is small in the frequency band of the signal and large in the frequency band of the noise is advantageous as a noise filter.

However, the frequency band of the noise to be removed is a digital signal whose frequency is within 100 MHz or 500 MHz.
As applications such as MHz to 5 GHz are put to practical use, inconveniences have surfaced with simple choke coils.

That is, when the frequency band of the noise is relatively close to the frequency band of the required signal, a simple choke coil cannot secure a sufficient ratio between the impedance of the signal frequency band and the impedance of the noise frequency band. However, as a result, if the noise is to be sufficiently attenuated, the required signal is also attenuated, or if the required signal is passed with low loss, the noise cannot be sufficiently attenuated. Was. In addition, it was necessary to meet the demand for miniaturization.

When the frequency band of the noise is relatively close to the frequency band of the required signal, a four-terminal filter having sharper frequency selectivity than a choke coil, for example, a π-type LPF
(LOW PASS FILTER: low pass filter). However, since a four-terminal filter is composed of at least two or more types of elements, it has a disadvantage that it is large in size, complicated to manufacture and easily expensive, and is more troublesome to mount on a circuit board than a two-terminal component. It was not very practical.

Therefore, for example, if the frequency of the signal is 100 MHz
less than z and the noise frequency band is 0.5 to 5 GHz
Even when the two frequency bands are relatively close to each other, a low-cost, easy-to-use and high-performance two-terminal laminated noise having low loss in the signal frequency band and a large attenuation rate in the noise frequency band. The invention of the filter was awaited.

[0007]

The problem to be solved by the present invention is to allow a required signal of about 100 MHz or less to pass with low loss, and to be about 0.5 GHz to 5 GHz.
To provide a high-frequency two-terminal laminated noise filter capable of effectively attenuating the noise in the frequency band described above.

[0008]

As a result of diligent studies to solve the above-mentioned problems, the present inventors have found that the present inventors have found that the low-loss and high-attenuation rates in the frequency band of 100 MHz or less and the high attenuation rate in the 0.5 to 5 GHz band are particularly excellent. This is a conceivable terminal noise filter. That is, the first invention of the present application is a two-terminal multilayer noise filter having a substantially rectangular parallelepiped shape formed by laminating a conductor and ferrite, and the resistance component R of the two-terminal multilayer noise filter at a frequency of 500 MHz is 10%.
This is a high-frequency two-terminal laminated noise filter formed so as to be 100 times or more the resistance component R at 0 MHz.

To further describe the present invention more carefully, the above description states that "a two-terminal laminated noise filter rises particularly rapidly at a frequency where the imaginary term of the magnetic permeability of the material used for the filter exceeds 100 MHz." Good.

The most novel and characteristic features of the present invention are:
Despite the simple structure of two terminals, 100MHz and 50MHz
By focusing only on the ratio of the resistance component of 0 MHz and increasing the ratio to 100 times or more, it is possible to secure a high impedance in the entire 0.5 to 5 GHz band and obtain a large noise attenuation effect by using a novel method. That is, it is a typical noise suppression component. Here, the above performance cannot be achieved unless the frequency characteristic of R, which is the resistance component of the complex impedance, rises particularly sharply at a frequency exceeding 100 MHz, but the above performance is achieved using a material having such a sharp frequency characteristic. Is achieved.

The second invention of the present application specifies the high-frequency two-terminal laminated noise filter as a laminated chip bead or an array thereof in which the effect of the invention is particularly remarkable.

Here, the laminated chip beads are surface-mounted (chips) and impedance elements (beads) integrally formed (laminated) by a laminating method.
Note that the bead core is originally a bead-like core, which emits a noise filter through a copper wire, but when it is collectively referred to as a laminated chip bead, it has the same definition as above. It is most common to use terms.

Further, the array described above is a collective impedance element in which a plurality of impedance elements that are separate from each other in terms of an electric circuit are integrally formed on one chip.
It goes without saying that this impedance element is a noise filter. Here, in the case of an array in which, for example, three impedance elements are integrally formed, since each impedance element has two terminals, the array naturally has a six-terminal chip appearance. However, it is essentially an assembly of two-terminal components. Thus, the number of terminals of the two-terminal laminated chip bead array in the present invention is, of course,
It is not the apparent number of terminals of the array. Note that the term array itself is widely used for a collective inductance element, a collective resistance element, and a collective capacitance element.

The third invention of the present application limits the materials to be used in the first or second invention. That is, the composition of the main component is Fe ₂ O ₃ : 45 to 49 mol%,
CuO: 9 to 13 mol%, ZnO: 8 mol% or less (excluding 0), CoO and / or CoO _4/3 :
0.1-1.5 mol%, NiO: 35-45 mol%
And Bi ₂ O ₃ , Pb as subcomponents
Any one of the first and second inventions of the present application, formed using a ferrite material containing a total of 0.7 wt% to 5 wt% of any one and / or two or more of O and V ₂ O _5. 2 is a two-terminal multilayer noise filter for high frequency according to the present invention. Here, CoO _4/3 means Co ₃ O ₄ , but the ratio of the number of metal ions is made uniform to achieve the rationality of the mole calculation.

In the present invention, it goes without saying that known substitution components, additives and impurities generally used for ferrite materials are acceptable. Such examples include Al ₂ O ₃ , Cr ₂ O ₃ , TiO ₂ and Li ₂ O as main component substitution components, B ₂ O ₃ and SiO ₂ as subcomponent additives, and Cl and CaO as impurities. Are very diverse.

However, since Mn oxides and MgO used in place of NiO are effective from the viewpoint of protection of scarce resources and from the viewpoint of raw material prices, the amount that can be replaced is specified in the fourth application of the present invention. Invention. In the fifth and sixth aspects of the present invention, the categories of the third and fourth aspects are changed to materials.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below based on embodiments. FIG. 1 is a partially transparent perspective view of a high-frequency two-terminal laminated noise filter of the present invention. The inside of the chip is composed of silver internal electrodes (illustration), silver through holes (illustration), and ferrite layers (not shown) as other parts. External electrodes are formed on both ends of the chip surface. However, in the drawings, the dimensional ratio, the number or the shape of each part does not limit the present invention. For example, a meander type may be used instead of the coil type.

[0018]

(Embodiment 1) A method for producing a high-frequency two-terminal laminated noise filter of the present invention will be described below in accordance with embodiments. First, a ferrite powder having a predetermined composition component was prepared, and blended with an organic solvent to form a green sheet by a doctor blade method. This ferrite powder is a powder for a normal laminated chip, but has a smaller particle size than other ferrite powder for producing a ferrite core, for example.

A predetermined through-hole hole is formed in the green sheet, a coil-shaped line is formed on one surface of the green sheet with silver paste by a screen printing method, and similarly, another coil is formed on the other surface. A shaped line was formed.
The position of the through hole is such that the two lines are electrically connected by the silver paste extending into the through hole. A plurality of green sheets obtained by repeating this operation were stacked in a predetermined number while adjusting the position, heated and pressed, cut, baked at 900 ° C. for 20 minutes, and baked with external electrodes to complete a laminated chip component. The description of the first embodiment is not particularly different from a general manufacturing method of a multilayer chip component.

The specific preparation conditions of the first embodiment are as follows. That is, the ferrite powders having the compositions shown in Tables 1 and 2 were calcined and then pulverized, and the pulverized powder used was a raw material having a 50% average particle size of 0.87 μm.

[0021]

[Table 1]

[0022]

[Table 2]

The green sheet was formed so that the thickness per sheet after the firing was 50 μm. The structure of the internal electrode, that is, the coil-type line and the through-hole is the structure shown in FIG. 1, and here, the dimensional ratio, the number or the shape of each part is as shown in FIG. The dimensions of the external electrodes are not accurate. The total number of layers was 16 sheets.
The external dimensions of the finished part are 1.6mm x 0.8mm x 0.8
mm. The thickness of the internal electrode is about 15 μm.

Tables 3 and 4 show the results of measuring the properties of these materials and parts. Here, the samples indicated by the same numbers as those in Tables 1 and 2 are samples having the same composition.

[0025]

[Table 3]

[0026]

[Table 4]

The characteristics of the material are as follows. Ten green sheets each made of ferrite powder having the above composition are laminated, heat-pressed, punched out in a ring shape, and
It baked for 0 minutes and measured using the impedance analyzer. The characteristics of the parts were measured using an impedance analyzer and a network analyzer.

The abbreviations used in Tables 3 and 4 are as follows. That is, μ′100 MHz and μ ″ 100 MHz are the real part and the imaginary part of the complex relative magnetic permeability, respectively, which are values at 100 MHz. R ₁ and R ₂ are the resistances of the impedances of the components created. And the values at 100 MHz and 500 MHz, respectively, where the multiple R ₂ / R ₁ is the ratio between the above R ₂ and R _{1. The} loss P100 is the insertion loss at 100 MHz and the loss due to the insertion of the component. The attenuations D _0.5 , D ₁ , and D ₅ are the dB ratios of the voltages across the load before and after the insertion of the above components.
These values are at 0.5, 1.0, and 5.0 GHz, respectively.
The characteristic impedance of each of the load and the transmission line is 50Ω.

Next, the result of the measurement in the first embodiment will be described in detail. When Table 3 and see diligently the results in Table 4, both multiple _R 2 / _{R 1} is the larger of the sample from 100, 100
The loss P _{100 at} MHz is less than 0.1 dB, ie very low loss, and 0.5 GHz, 1 GHz, 5 GHz
It can be seen that the attenuation is as good as 10 dB or more at all frequencies of Hz. This is a multiple R
_{As long as} the index of ₂ / R ₁ is greater than 100, the frequency of the signal to be transmitted is 100 MHz or less and the frequency of the noise to be attenuated is 0.5 to 5 GHz.
This shows that extremely useful components can be created as noise filters for terminals.

On the other hand, when the index P ₁₀₀ is smaller than _{100, the} index P ₁₀₀ is 0.5 regardless of the magnitude of the insertion loss at 100 MHz.
10 attenuation at at least one of the frequencies
It turns out that it is less than dB.

Next, according to Tables 1 to 4, the set of ferrite materials is shown.
Results of a detailed comparison of the relationship between
This will be described below. Sample Nos. 1 to 5
As shown in Table 1, Fe₂O₃Of 44.5 mol%
From 50 to 50 mol%. See Table 3
Street, Fe₂O₃Is in the range of 45 to 49 mol%
Is a multiple R₂/ R₁Is greater than 100 and extremely
And low attenuation and good attenuation over the entire range of 0.5 to 5 GHz.
is there. On the other hand, Fe₂O₃Is 44.5 mol%
If multiple R₂/ R₁Is less than 100 and the loss is low but reduced
The decay is less than 10 dB at 0.5 GHz. Further, F
e₂O₃Is 50 mol%, the multiple R₂/ R₁
Is less than 100 and the loss is low but the attenuation is 0.5 to 5 GH
Less than 10 dB over the entire range of z. Therefore, low loss and
Fe with high attenuation over the entire range of 0.5 to 5 GHz₂O
₃Of the composition range of 45 to 49 mol%
You.

As shown in Table 1, Samples Nos. 6 to 9 had ZnO
Is changed from 9 mol% to 0.5 mol%. As shown in Table 3, the ratio of ZnO was 8 mol%
In the following cases is greater than the multiple _R 2 / _{R 1} 100 none, very low loss at and attenuation is good across the 0.5～5GHz. On the other hand, when ZnO becomes 9 mol%, the multiple R ₂ / R ₁ is smaller than 100. After all, the loss is 0.
It increases to 25 dB, and the attenuation is less than 10 dB above 1 GHz. Therefore, it can be seen that the composition range of ZnO that has low loss and high attenuation over the entire range of 0.5 to 5 GHz is 8 mol% or less.

As shown in Table 1, samples Nos. 10 to 13
The ratio of uO was changed from 8 mol% to 14 mol%. As shown in Table 3 in the range ratio of 9～13Mol% of CuO, multiple _R 2 / _{R 1} is greater than 100, an extremely low loss and attenuation is good across the 0.5～5GHz. On the other hand, when the CuO ratio is 8 mol%,
In less than a multiple _R 2 / _{R 1} is 100, the loss is low but attenuation less than 10dB in the following 1 GHz. Furthermore, CuO
Is 14 mol%, the multiple R ₂ / R ₁ is 100
It is smaller, the loss is as large as 0.27 dB, and the attenuation is less than 10 dB over the entire range of 0.5 to 5 GHz. Therefore, it can be seen that the composition range of CuO that has low loss and high attenuation over the entire range of 0.5 to 5 GHz is 9 to 13 mol%.

As shown in Table 1, Samples Nos. 14 to 17
The ratio of iO was changed from 34 mol% to 45.5 mol%. NiO ratio is 35-45mol%
As the extent of that shown in Table 3, multiple _R 2 / _{R 1} is greater than 100, an extremely low loss and attenuation 0.5~5GH
Good over the entire range of z. On the other hand, the ratio of NiO is 34 mol
%, The multiple R ₂ / R ₁ is smaller than 100, the loss is as large as 0.29 dB, and the attenuation is 10 d at 1 GHz or more.
Less than B. Further, the ratio of NiO is 45.5 mol.
If percent, with less than a multiple _R 2 / _{R 1} is 100, the loss is low but the attenuation is not less than 10dB below 1 GHz. Therefore, it can be seen that the appropriate amount of NiO that has low loss and high attenuation over the entire range of 0.5 to 5 GHz is in the range of 35 to 45 mol%.

As shown in Table 2, Sample Nos. 18 to 22
The ratio of oO _4/3 was changed from 0 mol% to 1.7 mol%. Note that CoO _4/3 is Co ₃ O ₄
However, this shows that the calculation was made as a three-fold molar account by paying attention to the number of metal ions in the calculation of the molar ratio. Co
When the ratio of O _4/3 is in the range of 0.1 to 1.5 mol%, as shown in Table 4, the multiple R ₂ / R ₁ is larger than 100,
Very low loss and good attenuation over 0.5 to 5 GHz. On the other hand, when the ratio of CoO _4/3 is 0 mol%, the multiple R ₂ / R ₁ is smaller than 100, and the loss is 0.2 d.
B, and the attenuation is less than 10 dB over the entire range of 0.5 to 5 GHz. Furthermore, the ratio of CoO _4/3 is 1.7 mol%
, The multiple R ₂ / R ₁ is smaller than 100, the loss is low, but the attenuation is less than 10 dB below 0.5 GHz. Therefore, the composition range of _{CoO 4/3} such that the high attenuation across a low loss at and 0.5~5GHz is 0.1~1.5m
ol%.

As shown in Table 2, Samples Nos. 23 to 27 were obtained by changing the ratio of the auxiliary component Bi ₂ O ₃ from 0.6 wt% to 6 wt%. As in the range ratio of the 0.7～5Wt% shown in Table 4, it is greater than the multiple _R 2 / _{R 1} is 100, the very low loss at and attenuation is good across the 0.5～5GHz. On the other hand, the ratio of Bi ₂ O ₃ is 0.6 wt%.
For, in less than a multiple _R 2 / _{R 1} is 100, but the loss is small attenuation is less than 10dB below 1 GHz. Furthermore, when the ratio of Bi ₂ O ₃ reaches 6 wt%, the multiple R ₂ / R
₁ is less than 100, the loss is 0.1 dB but the attenuation is 0.1 dB.
Less than 10 dB over the entire 5 to 5 GHz range. Therefore, the composition range of Bi ₂ O ₃ that has low loss and high attenuation over the entire range of 0.5 to 5 GHz is 0.7 to 5 wt%.

As shown in Table 2, Samples Nos. 28 to 30 differ in the type and ratio of the subcomponents. PbO3wt%
Addition, V ₂ O ₅ 3 wt% addition, Bi ₂ O ₃ , Pb
O, V ₂ O ₅ 1 wt% each, 3 wt% addition of 3 wt%
Seed samples as shown in Table 4, a multiple _R 2 / _{R 1} is greater and almost equal than 100, an extremely low loss and attenuation is almost as good across the 0.5～5GHz. Therefore, the additive is any one of Bi ₂ O ₃ , PbO and V ₂ O _5.
Or two or more.

As shown in Table 2, Sample Nos. 31 to 34
Part of the iO is MnO₂Or MgO.
As shown in Table 4, 4 mol% and 8 mol% of NiO
nO ₂Is replaced by a multiple R₂/ R₁Is greater than 100
And almost the same, extremely low loss and attenuation of 0.5 to
It is almost equally good over the entire range of 5 GHz. In addition, NiO
Even if 8 mol% is replaced with MgO, multiple R₂/ R₁Is 1
Greater than and almost equal to 00, with extremely low loss and reduced
The decay is almost equally good over the entire range of 0.5 to 5 GHz.
Furthermore, 8 mol% of NiO is replaced with 4 mol% of MnO.₂
And 4 mol% of MgO, the multiple R₂/ R
₁Is greater than and almost equal to 100, with very low loss
And the attenuation is almost equally good over the entire range of 0.5 to 5 GHz.
is there. Therefore, at least 8 mol% or less of NiO
nO₂And / or MgO.

(Embodiment 2) Internal conduction was performed in the same manner as in Embodiment 1.
Reduce the number of layers of the body (equivalent to the number of coil turns)
The noise filter was prototyped without changing the case.
3. The same tendency as in Table 4 was obtained. That is, in the first embodiment,
Naturally, the fruit and material properties are the same.₁, R ₂, P
₁₀₀Becomes proportionally smaller and R₂/ R₁Is the same as in Example 1.
Unchanged, the attenuation value is slightly smaller overall and slightly higher
Although the difference of moving to the frequency side was seen, the magnification R₂/
R₁There is no situation that good characteristics only when the value is 100 or more
There was no change.

(Example 3) A noise filter was prototyped by increasing the number of laminated internal conductors (corresponding to the number of turns of a coil) in the same manner as in Example 1 and changing other conditions.
The same tendency as in Table 4 was obtained. That is, although the material properties are naturally the same as those in the first embodiment, R ₁ , R ₂ , and P ₁₀₀ are proportionally increased, R ₂ / R ₁ is the same as in the first embodiment, and the attenuation value is the whole. magnification R _{2 /} R ₁ had no place to change any situation that favorable characteristics only if over 100 but was observed difference of moving to slightly larger at and slightly lower frequency side.

(Embodiment 4) Similar to Embodiment 1
The overall size is reduced and the other conditions remain unchanged.
0mm x 0.5mm x 0.5mm noise filter
As a result, the same tendency as in Tables 3 and 4 was obtained. sand
That is, although the result and the material properties in Example 1 are naturally the same,
R₁, R₂, P₁₀₀Becomes proportionally smaller and R₂/ R
₁Is the same as in Example 1, and the attenuation value is slightly smaller as a whole.
Magnification R of the result₂/ R ₁Is more than 100 places
As long as it is good, there is no change in the situation of good characteristics
Was.

Fifth Embodiment A noise filter was prototyped in the same manner as in the first embodiment except that the shape of the inner conductor was changed to a meander shape, and other conditions were the same as in the first embodiment. However, the total length of the internal conductor was adjusted to the total length of the internal conductor of Example 1. The result was almost the same as that in Example 1, and was determined to be within the range of variation. That is, when compared with the results in Example 1, the material properties are naturally R ₁ , R ₂ , P
_{100, R 2 / R 1,} D 0.5, was comparable any of _D 1, D _5.

(Embodiment 6) The structure and the chip size of the inner conductor of Embodiment 1 were changed so that the outer shape was 3.2 mm in width and 0.3 mm in height.
A four-circuit two-terminal laminated chip bead array having a length of 8 mm and a length of 1.6 mm was prepared. FIG. 2 shows the outline. The structure of the internal conductor was the same as the structure of the internal electrode of the first embodiment, and an internal conductor for one circuit was formed, and four such, that is, four circuits were arranged in the width direction to form one array. .

A silver paste printed on a ferrite green sheet so as to have the internal conductor structure was laminated and thermocompressed in the same manner as in Example 1. After firing, the outer dimensions are 3.2 mm wide and 1.6 mm long (the height is 0.8 m
m) and then fired to form eight solder-plated Ag-based external electrodes to form an eight-terminal four-circuit laminated chip bead array. Hereinafter, evaluation was performed by changing the composition of the ferrite material in the same manner as in Example 1. As a result, the same results as in Example 1 were obtained for the individual impedance elements in the array.

As described above with reference to the first to sixth embodiments, the two-terminal laminated noise filter has a frequency of 500 MHz.
It is clear that the resistance component _{R 2} is exhibits an excellent damping in 0.5~5GHz if 100 times the resistance component _{R 1} at 100MHz in.

Further, the present invention can be generalized as follows.
Good. That is, the frequency f₁Imaginary number of complex permeability in
Term μ ”₁Is frequency 5 · f₁Imaginary term of complex permeability at
μ ” ₅Ferrite material not more than 1/100 of
The impedance element created by using₁Less than
Below, low loss and frequency 5 · f₁~ 5
0 · f₁That have high impedance throughout
It is.

Here, in order to obtain a lower loss and a higher impedance, the relative loss coefficient (tan δ / μ = μ ″ /) at a low frequency f _L of f ₁ or less as a ferrite material.
It is effective to use one having a smaller μ ′ ² ).
However, if f _L is about f ₁ or less, for example, 0.01
It may be at a sufficiently low frequencies, such as · f _1.

The present invention is also effective for noise suppression for high-frequency digital transmission lines. That is, a rectangular digital wave has as its waveform components an odd-numbered harmonic that extends over one or more digits of the fundamental wave, and at the same time, the frequency of this harmonic often overlaps with the frequency band of the noise to be removed. In such a case, there has been no effective means in the past to design the best noise filter for a high-frequency digital transmission line. However, by applying the present invention, digital waveform changes are small and noise can be effectively removed.

[0049]

As described above in detail, according to the present invention, a two-terminal for high frequency which allows a signal of 100 MHz to pass with low loss and effectively attenuates noise in a frequency band of 0.5 GHz to 5 GHz. It has become possible to obtain a laminated noise filter.

[Brief description of the drawings]

FIG. 1 is a perspective view of a two-terminal laminated noise filter according to one embodiment.

FIG. 2 is a perspective view of a two-terminal laminated noise filter according to another embodiment.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yasuo Tani 33-12 Minamisakaemachi, Tottori City, Tottori Prefecture F-term in the Tottori Plant of Hitachi Metals, Ltd. (reference) 5E041 AB01 AB19 CA02 NN02 NN15 5E070 AA01 AB08 BA12 BB13 CB02 CB13 5J024 AA01 DA22 DA26 DA28 DA32 EA08

Claims (6)

[Claims] 1. A two-terminal multilayer noise filter having a substantially rectangular parallelepiped shape formed by laminating a conductor and ferrite, wherein the two-terminal multilayer noise filter has a frequency of 500M.
A high-frequency two-terminal multilayer noise filter, wherein the resistance component R at 100 Hz is 100 times or more the resistance component R at 100 MHz. 2. The high frequency two-terminal multilayer noise filter according to claim 1, wherein the high frequency two-terminal multilayer noise filter is a two-terminal multilayer chip bead or an array of two-terminal multilayer chip beads used in a 0.5 to 5 GHz band. 2-terminal laminated noise filter. 3. The composition of the main component is Fe ₂ O ₃ : 45-49.
mol%, CuO: 9 to 13 mol%, ZnO: 8mo
1% or less (not including 0), CoO and / or CoO
_4/3 : 0.1 to 1.5 mol%, NiO: 35 to 45
mol% and Bi as an accessory component
_{3. A} ferrite material comprising a total of 0.7 wt% to 5 wt% of one or more of ₂ O ₃ , PbO and V ₂ O _5. The two-terminal laminated noise filter for high frequency described. 4. A two-terminal multilayer noise filter for high frequencies, characterized in that 0.1 to 8 mol% of NiO in the composition of the main component according to claim 3 is substituted with MnO ₂ and / or MgO. 5. The composition of the main component is Fe ₂ O ₃ : 45-49.
mol%, CuO: 9 to 13 mol%, ZnO: 8mo
1% or less (not including 0), CoO and / or CoO
_4/3 : 0.1 to 1.5 mol%, NiO: 34 to 45
mol% and Bi as an accessory component
_A ferrite material for a high-frequency two-terminal multilayer noise filter, comprising a total of 0.7 wt% to 5 wt% of any one and / or two or more of ₂ O ₃ , PbO, and V ₂ O _5. . 6. A ferrite for a high-frequency two-terminal multilayer noise filter, wherein 0.1 to 8 mol% of NiO in the composition of the main component according to claim 5 is substituted with MnO ₂ and / or MgO. material.