JP3002613B2 - Dielectric porcelain composition for producing dielectric resonator or filter for microwave, method for producing the same, dielectric resonator or filter for microwave obtained using the dielectric porcelain composition, and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric ceramic composition for producing a dielectric resonator or filter for microwaves and a method for producing the same, and more particularly to a microporous material having an inner conductor, such as a stripline type filter having a triplate structure. The present invention relates to a dielectric porcelain composition capable of being fired at a low temperature, which is preferably used for advantageously producing a dielectric resonator for waves, and a method for producing the same. In addition, the present invention provides a microwave dielectric resonator obtained by using such a dielectric ceramic composition, a microwave dielectric filter including a plurality of the resonators, and a dielectric resonator for the microwave. The invention relates to a method for advantageously producing a vessel or a dielectric filter.

[0002]

2. Description of the Related Art Today, coaxial dielectric filters using a high-permittivity porcelain composition are widely used in cellular phones, automobile telephones, and the like.
On the inner peripheral surface and outer peripheral surface of the cylindrical dielectric block, respectively, a plurality of coaxial resonators provided with an inner conductor and an outer conductor are coupled and configured. However, there is a limit to the size reduction, and therefore, a strip line type having a triplate structure in which a conductor is provided inside a dielectric is being studied. In this stripline type filter, conductors are arranged in a predetermined pattern in a plate-shaped dielectric and provided integrally, and a structure in which a plurality of resonators are formed is employed. (Thickness) can be reduced, so that the size can be reduced.

[0003] When a dielectric filter having an inner layer conductor such as a stripline type filter is manufactured, simultaneous firing of the inner layer conductor and the dielectric ceramic composition is required. Since the porcelain composition has a very high firing temperature of 1300 to 1500 ° C., it is limited by a conductor material that can be used as the inner layer conductor, and a Cu-based material having a low conduction resistance and further an Ag-based material are used. It was difficult to use. For example, in order to use a Cu-based alloy or an Ag-based alloy as the inner conductor, the firing temperature of the dielectric ceramic composition needs to be 1100 ° C. or less,
Further, in order to use an Ag-Pd-based alloy or an Ag-Pt-based alloy, the firing temperature of the dielectric porcelain composition needs to be 1000 ° C. or less. The firing temperature of the dielectric porcelain composition must be around 900 ° C., which is the melting point of Ag: 962 ° C. or less. Therefore, there is a need for a dielectric ceramic composition which can be sintered at such a low firing temperature and has excellent high frequency characteristics.

[0004] On the other hand, various types of dielectric ceramic compositions have been conventionally proposed.
The dielectric ceramic composition for microwaves of BaO-TiO ₂ composition has a high relative dielectric constant of about 30 to 40,
Is also known as a material having a high temperature coefficient of resonance frequency. For example, in JP-B-58-20905, the production of the dielectric ceramic BaO-TiO ₂ system Ba ₂ Ti ₉ O ₂₀ composition, although the detailed description has been made, in which, 1300-1400 ° C. Therefore, a high firing temperature is employed, and therefore, the above-mentioned demand for low-temperature firing cannot be sufficiently satisfied.

Also, Japanese Patent Application Laid-Open Nos. 57-69607, 58-73908, 60-25700
No. 8 discloses that the dielectric porcelain characteristics are improved by adding ZnO or SnO ₂ or adding ZnO and ZrO ₂ to the BaO—TiO ₂ based dielectric porcelain composition. It has been clarified that the firing temperature of these dielectric ceramic compositions was as high as 1200 to 1400 ° C.

Furthermore, Japanese Patent Publication No. 55-222012 discloses that a glass powder frit such as lead borosilicate barium glass or lead borosilicate glass is mixed with a dielectric powder having a TiO ₂ —SnO ₂ —BaO composition. Although an example in which a thick film capacitor for temperature compensation is produced by firing at 950 ° C. has been disclosed, since it is intended only for a thick film capacitor, such a dielectric ceramic composition has been disclosed. When a dielectric resonator or a dielectric filter for microwaves is manufactured using an object, the no-load Q characteristic is poor and the temperature coefficient of the resonance frequency is increased, so that the function as a resonator or a filter is sufficiently exhibited. Did not gain.

[0007]

The present invention has been made in view of the above circumstances, and has as its object to improve characteristics such as relative permittivity, no-load Q, and temperature coefficient of resonance frequency. At a firing temperature of 1100 ° C. or less, preferably 1000
An object of the present invention is to provide a dielectric ceramic composition for producing a dielectric resonator or filter for microwaves capable of sintering at a firing temperature of not more than 900C, more preferably around 900C, and an advantageous production method thereof. Another object of the present invention is to provide a microwave dielectric resonator obtained by using such a dielectric ceramic composition or a microwave dielectric filter including a plurality of the resonators, Another object of the present invention is to provide an advantageous manufacturing method of the dielectric resonator or the dielectric filter.

In order to solve such a problem, the present inventors have made various studies and found that BaO-Ti
O ₂ system, BaO-TiO ₂ -ZnO system, BaO-TiO
₂ -ZrO ₂ system, BaO-TiO ₂ -ZrO ₂ -ZnO
System, BaO-SrO / CaO-TiO ₂ system, BaO-S
rO / CaO-TiO ₂ -ZnO system, BaO-SrO /
CaO-TiO ₂ -ZrO ₂ system, or BaO-SrO
By adding a predetermined amount of glass containing B ₂ O ₃ or B ₂ O ₃ as one of the glass components to a dielectric porcelain composition such as / CaO—TiO ₂ —ZrO ₂ —ZnO system, They have found that the firing temperature can be effectively lowered while ensuring excellent properties.

[0009]

That is, the present invention has been completed based on the above-mentioned findings, and is characterized by the general formula: (1-ab) BaO.aSrO.bCa
O · x _{[(1-c) TiO 2 ·} cZrO 2 ] · YZnO
(However, 3.1 ≦ x ≦ 5.4, 0 ≦ y ≦ 2.9, 0 ≦ a
+ B ≦ 0.4, 0 ≦ c ≦ 0.2), comprising barium oxide and titanium oxide, or at least one of strontium oxide, calcium oxide, zirconium oxide and zinc oxide the composition as a main component, per 100 parts by weight of the main component composition, as an accessory component, a glass containing at least B ₂ O ₃ or B ₂ O ₃ as one of glass components, the B ₂ O ₃ Converted to 0.
A dielectric ceramic composition for producing a microwave dielectric resonator or filter, which is blended in a ratio of 1 to 7.5 parts by weight.

In the present invention, when producing such a dielectric ceramic composition for producing a microwave dielectric resonator or filter, the raw material composition for providing the main component composition is prepared in advance. After calcining, and then finely pulverizing the obtained calcined material, the pulverized material is blended with at least a glass containing the sub-component B ₂ O ₃ or B ₂ O ₃ as one of the glass components. Then, a method of mixing the resulting mixture to obtain a desired dielectric porcelain composition is advantageously employed.

Further, the present invention comprises a dielectric ceramic for microwaves or a dielectric resonator for microwaves having a conductor pattern formed in the dielectric ceramic by co-firing with the dielectric ceramic. In the microwave dielectric filter, the dielectric porcelain is composed of the dielectric porcelain composition as described above, that is, the dielectric porcelain obtained by firing the dielectric porcelain composition according to claim 1. , The conductor pattern is made of Ag or Cu alone or Ag or C
The gist of the present invention is also a microwave dielectric resonator or a microwave dielectric filter comprising the resonator, which is formed of an alloy material containing u as a main component.

Further, according to the present invention, a microwave dielectric resonator having a dielectric ceramic and a conductor pattern provided in the dielectric ceramic or a microwave dielectric filter comprising the resonator is manufactured. In this case, the dielectric ceramic is provided, and a molded body or a calcined product of the dielectric ceramic composition according to claim 1 is provided with the conductor pattern. The present invention also provides a method for manufacturing a microwave dielectric resonator or a microwave dielectric filter comprising the resonator, wherein a conductor layer formed of an alloy material is provided and co-fired. It is assumed that.

[0013]

[Specific Configuration] Incidentally, in such a dielectric ceramic composition, the main component composition, BaO (barium oxide) and TiO ₂ (titanium oxide), or with their BaO and TiO _2, SrO (strontium oxide), C
aO-(calcium oxide), ZrO ₂ (zirconium oxide), and ZnO but are those composed of at least one of (zinc oxide), where, (1-a-
b) BaO.aSrO.bCaO converts part of BaO to S
This means that substitution is made with at least one of rO and CaO. Thus, a part of BaO is converted to S
By substituting with rO and / or CaO, the relative dielectric constant can be increased. Further, since the temperature coefficient (τf) of the resonance frequency can be changed in the positive direction, the composition system containing ZnO or ZrO ₂ is also effective in correcting the temperature coefficient (τf). Further, there is an effect of improving sinterability. However, the substitution ratio (a + b)
Exceeds 0.4, the temperature coefficient of the resonance frequency increases to the positive side, which is outside the practical range. In addition, a problem of lowering the no-load Q value also arises. A more desirable range in which the unloaded Q value can be kept large and the relative dielectric constant can be improved is 0.05 ≦ a + b ≦ 0.2.

In the present invention, TiO ₂ or [(1-c) TiO ₂ .cZrO ₂ ] is (1-a-
b) The molar ratio to the total amount of BaO.aSrO.bCaO (1 mol) is 3.1 to 5.4 mol (3.1 ≦ x ≦ 5.4), preferably 3 mol. It needs to be contained in a proportion of 0.5 to 5.0 mol. TiO ₂ or [(1-c) T
If [iO ₂ · cZrO ₂ ] is more than 5.4 mol (5.4 <x), the temperature coefficient (τf) of the resonance frequency becomes large, which is out of the practical range.
If the amount is less than 1 mol (x <3.1), there is a problem that the no-load Q value is extremely reduced. In order to keep the no-load Q value high, it is particularly desirable that 3.8 ≦ x ≦ 4.2. As described above, by replacing a part of TiO ₂ with ZrO ₂ , the temperature coefficient of the resonance frequency can be changed in the negative direction.
Exceeds 0.2, the unloaded Q value or the relative dielectric constant is reduced. This substitution has an effect of improving the sinterability, and the slight substitution (≦ 0.10) has an effect of improving the relative dielectric constant.

Further, such a main component composition is composed of BaO and TiO ₂ , or BaO and TiO ₂ , and Sr
When composed of ZnO together with at least one of O, CaO and ZrO ₂ , such Zn
The ratio (y) of O must be 2.9 mol or less (y ≦ 2.9) in a molar ratio. In addition,
If ZnO is more than 2.9 mol (2.9 <y),
There is a problem that the temperature coefficient of the resonance frequency becomes too large in the negative direction (negative direction). In the present invention, the temperature coefficient of the resonance frequency can be effectively adjusted by variously changing the ratio of TiO ₂ (x) and ZnO (y). In particular, the ratio of ZnO (y) can be increased. Then, it becomes possible to change the temperature coefficient in the negative direction.

According to the present invention, barium oxide and titanium oxide or strontium oxide, calcium oxide, zirconium oxide, and / or
Or, a composition mainly composed of a porcelain composition constituted by combining zinc oxide, and a predetermined subcomponent is added to such a main component composition as described later. However, for such a main component porcelain composition, aluminum oxide, tungsten oxide, nickel oxide, iron oxide, oxidized oxide, etc., for the purpose of improving the no-load Q and correcting the temperature coefficient of the resonance frequency. It is also possible to add metal oxides such as manganese and chromium oxide.

In addition, B ₂ O _{3, which} is an essential component constituting a sub-component in the present invention, is obtained by firing the above-mentioned main component porcelain composition at a low temperature, that is, at a firing temperature of 1100 ° C. or less.
It is an effective component for firing at a temperature of 00 ° C. or less, and further, a melting point of Ag: 962 ° C. or less, preferably 950 ° C. or less. As a method of adding the B ₂ O ₃ component, B ₂ O ₃
Can be added as a single component, in other words, as a B ₂ O ₃ powder, and can be added simultaneously with other additional components such as ZnO, SiO ₂ , and Bi ₂ O ₃ . In particular, simultaneous addition of ZnO has the effect of improving the relative dielectric constant while maintaining a high unloaded Q value,
The addition of SiO ₂ and Bi ₂ O ₃ has the effect of improving the sinterability. As the simultaneous addition method, besides the method of simultaneously adding the powders of the respective components, there is a method of adding these components by vitrification as described later.

In particular, the B ₂ O ₃ component is liable to absorb water alone and causes a problem in the storage stability of the raw material after addition.
A glass containing B ₂ O ₃ as one of the glass components,
It is desirable to add it, and this vitrification can solve such a problem. In addition, B ₂ O ₃
When the raw material is converted into a green sheet due to water absorption, there is an inherent problem that the state of the slurry deteriorates and a good tape cannot be obtained, but this problem can also be advantageously solved by vitrification of B ₂ O _3. It is. This B ₂
Many glasses containing O ₃ are known, for example, ZnO
—SiO ₂ —B ₂ O ₃ glass, SiO ₂ —B ₂ O ₃ -based glass, Bi ₂ O ₃ —ZnO—B ₂ O ₃ -based glass, and the like. In the present invention, any of those glasses can be used. Can also be used advantageously.

By the way, such an auxiliary component containing the B ₂ O ₃ component as an essential component can be added to the above-mentioned calcined material as the main component porcelain composition, and can be used for obtaining such a calcined material. Prior to the calcination operation, it is added to the raw material composition that provides such a main component porcelain composition, but the former addition method, that is, the raw material composition that provides the main component porcelain composition, is calcined. In the present invention, since the method of adding the above-mentioned auxiliary components to the obtained calcined material is more excellent in dielectric ceramic properties, in the present invention, the former method is adopted. Recommended.

Further, in any of the above addition methods, the amount of such an auxiliary component is generally calculated as B ₂ O ₃ with respect to 100 parts by weight of the main component porcelain composition. , In an amount of 0.1 to 7.5 parts by weight. B ₂ O ₃ as such is less than 0.1 part by weight, the if the amount of such auxiliary components is less, Eze sufficiently exhibit the effect of adding B ₂ O _3, because sinterability is lowered Yes, and if added in a large proportion exceeding 7.5 parts by weight, the no-load Q characteristic in the microwave region will deteriorate. Incidentally, preferably, B ₂ O ₃ is caused to added to a ratio of 0.1 to 6.0 parts by weight.

As described above, in the present invention, the B ₂ O ₃ component is added and blended as a sub-component to a predetermined main component porcelain composition. The raw material composition for providing the component porcelain composition is calcined at a temperature of 900 ° C. or more, and the obtained calcined product is finely ground so that the average particle diameter is 0.8 μm or less, preferably 0.7 μm or less. It will be crushed.

That is, the raw material composition giving the above-mentioned main component porcelain composition is calcined at a temperature of 900 ° C. or more, preferably 1000 ° C. or more, and the calcined product (main component porcelain composition) obtained thereby is obtained. By sufficiently crystallizing,
Even in the case of low-temperature firing, the dielectric ceramic characteristics such as the relative dielectric constant and the no-load Q characteristic can be advantageously improved, so that a dielectric ceramic having sufficient characteristics can be obtained. . However, if the calcining temperature exceeds 1350 ° C., the calcined material hardens significantly after calcining, causing a problem in handling.
A calcination temperature of 00 ° C. will be advantageously employed.

When the calcined material obtained by calcining in this manner is pulverized, the lower the average particle size of the pulverized material, the more the decrease in the firing temperature of the dielectric ceramic composition is promoted. It is possible to improve the relative permittivity and the no-load Q. Therefore, in the present invention, 0.8μ
m, preferably 0.7 μm or less, so that the calcined material is pulverized, thereby reducing the temperature,
Thus, low-temperature baking at a melting point of 962 ° C. or less became possible. Since the calcined and pulverized product has a small particle diameter, the sinterability is improved and the amount of the auxiliary component (B ₂ O ₃ ) added can be reduced. The characteristics are improved, but the average particle size of the calcined
When the diameter is smaller than μm, the moldability of the obtained dielectric ceramic composition decreases, and for example, it becomes difficult to form a tape by a normal doctor blade method or the like. It is desirable to control so as to be within the range of 0.8 μm. In addition, the particle diameter of such a fine pulverized product is generally measured by using a laser diffraction scattering method.

Further, B ₂ O ₃ powder or B ₂ O _3, which is a sub-component according to the present invention, which is added to the calcined and pulverized product obtained by pulverizing in such a manner, is mixed with one of the glass components.
Regarding the particle size of the glass powder to be included, it is not necessary to carry out the fine pulverization as much as the calcined product, and even if it has an average particle size of about 2 μm to 4 μm, it can be used without any problem.

In a system in which such subcomponents are added to the raw material composition for providing the main component porcelain composition prior to the calcination operation, such subcomponents are included. The calcined material is pulverized to form a fine powder, particularly a powder having an average particle diameter of 0.8 μm or less, which constitutes the dielectric ceramic composition for manufacturing a microwave dielectric resonator or filter according to the present invention. That would be.

[0026]

EXAMPLES Hereinafter, some examples of the present invention will be described to clarify the present invention more specifically. However, the present invention does not impose any restrictions due to the description of such examples. Needless to say, it is not what we receive. In addition, various changes, modifications, improvements, and the like can be made to the present invention based on the knowledge of those skilled in the art without departing from the spirit of the present invention, in addition to the examples described below. Should be understood.

Example 1 High purity barium oxide, strontium oxide,
Calcium oxide, titanium oxide, zinc oxide, and zirconium oxide were used, and these components were replaced with (1-ab) BaO.
・ ASrO.bCaO.x [(1-c) TiO ₂ .cZ
[rO ₂ ] .y ZnO was weighed to give various x, y, a, b, and c values shown in Table 1 below, and placed in a polyethylene pot at 10 mm.
The mixture was put together with a zirconia cobblestone of φ, and ion-exchanged water was further added, followed by wet mixing. Then, after taking out the obtained mixture (slurry) from the pot and drying,
It was placed in an alumina crucible and calcined at a temperature of 1150 ° C. for 4 hours in an air atmosphere.

Thereafter, the calcined product was crushed by a roll crusher and passed through a 24 mesh sieve. Then, put the powder again in a polyethylene pot.
The average particle diameter measured by using a laser diffraction scattering method (microtrack) is added by adding together with zirconia cobblestone of mmφ, ion-exchanged water is further added, and 0.4 to 0.5.
The wet pulverization was carried out until the thickness reached μm to obtain various calcined pulverized products.

Next, 100 parts by weight of the thus obtained various calcined and pulverized materials and a predetermined part by weight of a boron oxide powder shown in Table 1 as an auxiliary component were added together with alumina boulders.
The mixture was put into a polyethylene pot, ion-exchanged water was added, and the mixture was wet-mixed. At that time, 1% by weight of PVA was added to the powder as a binder for press molding. After the obtained slurry was dried, it was passed through a sieve with an opening of 355 μm and granulated. In the experiments of No. 4 and No. 5 in Table 1, zinc oxide powder was added together with boron oxide powder.
In the amounts shown in Table 1. In addition, in the experiment of No. 6 in Table 1, the boron oxide powder was mixed with
After being blended into the main component composition and calcined at 1100 ° C,
Finely pulverized and granulated as in other experiments.

The granulated powder thus obtained is molded at a surface pressure of 1 ton / cm ² using a press molding machine,
A disk-shaped test piece having a size of mφ × 15 mm ^t was obtained. Then, the obtained test piece is placed in air at 900
Various dielectric ceramic samples were prepared by baking at a temperature of ° C. for 2 hours. Furthermore, polishing the sample obtained by this firing to the size of the disk-shaped diameter of 16 mm × 8 mm ^t, respectively, to measure the dielectric properties. The relative permittivity (εr) and the no-load Q were measured by a parallel conductor plate type dielectric resonator method, and the temperature coefficient of resonance frequency (τ
f) was measured in the range of −25 ° C. to + 75 ° C. The measurement frequency was 3 to 5 GHz. The results obtained are shown in Table 1 below.

[0031]

[Table 1]

In Table 1, Nos. 1-3 and 7-
As is clear from the result of No. 11, sintering at a temperature of 900 ° C. becomes possible by blending boron oxide as an auxiliary component. However, if the compounding amount is too large,
11, the temperature coefficient of the resonance frequency increases, and the no-load Q decreases. Also, by blending zinc oxide and boron oxide simultaneously (No. 4,
5) The unloaded Q can be improved. In addition, the results of No. 6 in which boron oxide was blended with the mixture of the main component composition and calcined at the same time, the unloaded Q was smaller than that in the case of blending in calcined pulverization, but the properties are sufficiently useful. Is obviously obtained.

Example 2 Using high-purity barium oxide or barium carbonate, strontium oxide, calcium oxide, titanium oxide, zinc oxide, and zirconium oxide, the components were:
(1-ab) BaO.aSrO.bCaO.x [(1
In the composition represented by -c) TiO ₂ · cZrO _2] · YZnO, various x shown in Table 4-6,
It was weighed so as to give y, a, b, and c values, poured into a polyethylene pot together with a 10 mmφ zirconia cobblestone, further added with ion-exchanged water, and wet-mixed. Then, the obtained mixture (slurry) is taken out of the pot, dried, put into an alumina crucible, and put into a crucible.
Calcination was performed at a temperature of 150 ° C. to 1250 ° C. for 4 hours in an air atmosphere.

Thereafter, the calcined product was crushed by a roll crusher and passed through a 24-mesh sieve. Then, put the powder again in a polyethylene pot.
The average particle diameter measured by using a laser diffraction scattering method (microtrack) is added by adding together with zirconia cobblestone of mmφ, ion-exchanged water is further added, and 0.4 to 1.0.
The wet pulverization was carried out until the thickness reached μm to obtain various calcined pulverized products.

On the other hand, high-purity zinc oxide, boron oxide, silicon oxide, and bismuth oxide were weighed so as to have the ratios shown in Table 2 below, and 10 mmφ of alumina was placed in a polyethylene pot. It was charged together with the cobblestone and mixed in a dry manner. Then, the obtained mixture was placed in a chamotte crucible at 1100 ° C. to 1250 ° C.
After heating and melting at a temperature of 20 ° C. for 20 minutes, the mixture was quenched in water and vitrified. The obtained glass was put into an alumina pot together with alumina boulders, and the average particle diameter measured by a laser diffraction scattering method in ethanol was 2 to 6;
By pulverizing to a size of μm, various glasses A to I were obtained as auxiliary components.

[0036]

[Table 2]

Next, in the same manner as in Example 1, 100 parts by weight of the various calcined and pulverized products thus obtained and 0 to 10 parts by weight of various glasses as auxiliary components shown in Table 2 were used. Then, various test pieces for evaluating characteristics were prepared. In the experiment of No. 52 in Table 5, Z shown by NoE was used.
nO-B ₂ O ₃ -SiO ₂ based glass, prior to calcination, is formulated in the main component composition, after being calcined at 1100 ° C., as with other examples, finely ground, were granulated .

Further, a glass having the composition shown in Table 3 below was used, and was blended at a ratio of 2 parts by weight to 100 parts by weight of the calcined and pulverized product. A test piece was obtained.

[0039]

[Table 3]

The various test pieces thus obtained were fired in air at a temperature of 870 ° C. to 900 ° C. for 2 hours to produce various dielectric ceramic samples. Further, the dielectric properties of the sample obtained by the firing were measured in the same manner as in Example 1, and the obtained results are shown in Tables 4 to 6 below.

[0041]

[Table 4]

[0042]

[Table 5]

[0043]

[Table 6]

In Tables 4 to 6, Nos. 12 to 1
7, the temperature coefficient of the resonance frequency is increased when the ratio of titanium oxide to barium oxide in the main component composition is X ≦ 3.0 or X ≧ 5.5. You. Also, from the results of Nos. 18 to 22 in which the effect of zinc oxide in the main component composition was examined, it is clear that when Y ≧ 3.0, the temperature coefficient of the resonance frequency becomes too small. Furthermore, as is clear from the evaluation of Nos. 30 to 35 regarding the characteristics when barium oxide was replaced with strontium oxide and calcium oxide,
Substitution of these components can improve the dielectric constant. As in No. 34 of the comparative example, when a + b> 0.4, the temperature coefficient of the resonance frequency becomes too large,
In addition, there is a problem that the no-load Q becomes small. Also,
From the results of Nos. 36 and 37, it is recognized that when the titanium oxide is replaced with the zirconium oxide, the temperature coefficient of the resonance frequency can be reduced by the replacement. From the results of Nos. 38 to 40, regarding the characteristics when the replacement of titanium oxide and barium oxide was performed at the same time, as in Comparative Example No. 40, when C> 0.2, the no-load Q was reduced. .

Further, various ZnO-B ₂ O ₃ No23~29,41,42 which examined the effect of -SiO ₂ based glass,
More 53-56, as a sub component containing boron oxide, it is understood ZnO-B ₂ O ₃ -SiO ₂ based glass are effective. Furthermore, as is clear from the results of Nos. 43 and 59 showing the effect of the SiO ₂ —B ₂ O ₃ -based glass, SiO ₂ —
B ₂ O ₃ glass is effective. As an accessory component, PbO
From the evaluation of the characteristics when -SiO ₂ -B ₂ O ₃ -based glass (No. 50, 51) and glass not containing boron oxide (No. 49) were blended, the glass containing no boron oxide as in Comparative Example No. 49 was calcined. It is recognized that the effect of lowering the temperature is small and is not effective as an accessory component. Further, ZnO-B mixture of the main component composition ₂ O ₃ -SiO ₂
The ingredients were blended and calcined at the same time. From the result of No52,
As compared with the case where it is blended with the calcined and pulverized product, the no-load Q becomes smaller, but it is recognized that a sufficiently useful property can be obtained.

Embodiment 3 In the embodiment 2, no. 18 as a main component composition (calcined and ground) and glass powder D as an accessory component
100 parts by weight of the main component composition and 2 parts by weight of the accessory component glass were placed in a polyethylene pot at 5 m.
Injected with zirconia cobblestone of mφ, further added polyvinyl butyral, plasticizer and deflocculant, and also added a mixed solution of toluene and isopropyl alcohol, 64 hours,
Wet mixed.

Then, after defoaming the mixture, a green tape having a thickness of 250 μm was formed by a doctor blade method. Then, a 1800 MHz _Z band 2 was formed on the obtained green tape using an Ag paste for printing.
The conductor pattern of the step bandpass filter was printed. Next, twelve green tapes were heated at a temperature of 100 so as to sandwich the green tape on which the conductor pattern was printed.
℃, pressure: were stacked and integrated in the conditions of 100kgf / cm ^2. Then, after cutting the laminate, the laminate was fired in air at a temperature of 900 ° C. for 2 hours to produce a stripline type filter shown in FIG.
In the stripline filter shown in FIG. 1, the dielectric substrate 16 has a three-layer structure, and is integrated by simultaneous firing with a conductor. A plurality of resonance electrodes 12, 12 are built in one layer of the dielectric substrate 16, and a pair of different coupling electrodes 20, 20 are built therein. On the other hand, a ground electrode 14 is provided on substantially the entire outer surface of the dielectric substrate 16, and a pair of input / output terminals 18, 1 are connected to the pair of opposing side surfaces in a state of being disconnected from the ground electrode 14.
8 are provided. Then, the coupling electrode 20,
Since the extension 20 is extended and the end of the extension 20a is extended to the outer surface of the dielectric substrate 16, the input / output terminal 18 on the outer surface and the internal coupling electrode 20 are connected. It is being done.

The filter characteristics of the stripline type filter thus obtained were measured using a network analyzer.
H _Z , insertion loss: 2.0 dB.

[0049]

As is apparent from the above description, the dielectric ceramic composition according to the present invention comprises barium oxide (BaO) and titanium oxide (TiO ₂ ), or components thereof, strontium oxide (SrO), and calcium oxide. (Ca
O), zirconium oxide (ZrO ₂ ) and zinc oxide (Z
nO) as a main component, each of these components is contained in a specific amount, and B ₂ O ₃ or B ₂ O ₃ is included as one of the glass components as an auxiliary component. By containing a predetermined amount of glass, sintering can be performed at a firing temperature of 1100 ° C. or lower, preferably 1000 ° C. or lower, more preferably at a firing temperature of about 900 ° C. A dielectric such as a dielectric resonator for microwave having a low Ag or Cu simple substance or an alloy material containing Ag or Cu as a main component as an inner layer conductor, and a strip line type filter composed of a plurality of such resonators. Body filter can be advantageously manufactured, and the obtained dielectric porcelain has excellent relative permittivity and no-load Q, and has a small temperature coefficient of resonance frequency. It has unique features.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a form of a laminated structure of a bandpass filter manufactured in a third embodiment.

[Explanation of symbols]

 12 resonance electrode 14 earth electrode 16 dielectric substrate 18 input / output terminal 20 coupling electrode

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI // H01P 1/203 H01P 7/08 7/08 7/10 7/10 11/00 G 11/00 H C04B 35/49 Z (72) Inventor Shinsuke Yano No. 301, Building 89, Narumi Housing Complex, 22 Urubakoyama, Midori-ku, Nagoya City, Aichi Prefecture (56) References JP-A-60-118666 (JP, A) JP-A-63-224107 (JP) JP-A-5-70221 (JP, A) JP-A-5-211006 (JP, A) JP-A-5-234420 (JP, A) JP-A-5-319922 (JP, A) 55-10926 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01B 3/12 303 C01G 25/00 C04B 35/49 C04B 35/71 H01B 3/02 H01P 1/203 H01P 7/08 H01P 7/10 H01P 11/00 (54) [Title of the Invention] Dielectric ceramic composition for producing dielectric resonator or filter for microwave Patent application title: METHOD FOR PRODUCING THE SAME, DIELECTRIC RESONATOR OR FILTER FOR MICROWAVE OBTAINED BY USING THE DIELECTRIC CERAMIC COMPOSITION

Claims (4)

(57) [Claims] 1. General formula: (1-ab) BaO.aSr
O · bCaO · x _{[(1-c) TiO 2 ·} cZrO 2 ]
YZnO (However, 3.1 ≦ x ≦ 5.4, 0 ≦ y ≦ 2.
9,0 ≦ a + b ≦ 0.4, 0 ≦ c ≦ 0.2) barium oxide and titanium oxide, or at least one of strontium oxide, calcium oxide, zirconium oxide, and zinc oxide A composition consisting of a seed and at least B ₂ O ₃ or B ₂ O as an auxiliary component with respect to 100 parts by weight of the main component composition
Glass, B microwave characterized by comprising brought formulated in proportions of 0.1 to 7.5 parts by weight in terms of ₂ O ₃ dielectric resonator or filter including ₃ as one of glass components A dielectric porcelain composition for manufacture. 2. In producing the dielectric porcelain composition according to claim 1, the raw material composition for providing the main component composition is calcined, and then the obtained calcined material is finely pulverized. A method for producing a dielectric ceramic composition for producing a microwave dielectric resonator or a filter, comprising mixing and mixing the subcomponents with a pulverized material. 3. A microwave dielectric resonator having a dielectric ceramic and a conductor pattern formed in the dielectric ceramic by co-firing with the dielectric ceramic, or a microwave dielectric comprising the resonator. A dielectric filter, which is formed by firing the dielectric ceramic composition according to claim 1 as a body filter, while the conductive pattern is made of Ag or Cu alone or Ag or Cu. C
A dielectric resonator for microwaves or a dielectric filter for microwaves comprising the resonator, the dielectric resonator being formed of an alloy material containing u as a main component. 4. A method of manufacturing a microwave dielectric resonator having a dielectric ceramic and a conductor pattern provided in the dielectric ceramic or a microwave dielectric filter comprising the resonator. The dielectric ceramic composition according to claim 1, which gives a body porcelain, and the conductive pattern is applied to a molded body of the dielectric porcelain composition or a calcined product thereof, wherein Ag or Cu alone or Ag or C is provided.
A method for producing a microwave dielectric resonator or a microwave dielectric filter comprising said resonator, comprising: providing a conductor layer formed of an alloy material containing u as a main component and simultaneously firing the conductor layer. .