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Dielectric ceramic material and dielectric resonator with the material

A dielectric ceramic and perovskite technology, applied in the field of a new type of dielectric ceramic material

Inactive Publication Date: 2003-05-14
KYOCERA CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, there arises such a problem that a barium magnesium tungsten based dielectric ceramic composition (Japanese Patent Laid-Open No. 5-205524), a strontium magnesium tungsten based dielectric ceramic composition (Japanese Patent No. Hei 6-5117), and The (barium magnesium tungsten + group IIIV elements) based dielectric ceramic composition (Japanese Patent Laid-Open No. 6-236708) has a Q factor between 25,000 and 180,000, which is when the relative permittivity εr is from 19 to 25 Converted to a value based on 1GHz within the range of

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[0048] Barium carbonate (BaCO) with a purity of more than 99% 3 ), strontium carbonate (SrCO 3 ), magnesium carbonate (MgCO 3 ), tungsten trioxide (WO 3 ), oxides of rare earth elements and manganese dioxide (MnO 2 ) powder, weighed according to the ratio shown in Table 1, and mixed with water, placed in a ball mill covered with rubber on the inner surface for water treatment for 8 hours. After dehydration drying, the mixture was calcined at 1000°C for 2 hours. The sintered product is wet-milled with a ball mill, and ground into a powder with an average particle size ranging from 0.8 μm to 1.0 μm.

[0049] The ground powder was dried into granules to form cylindrical preforms with a diameter of 10 mm and a thickness of 5 mm. The cylindrical preform is maintained at a temperature of 1670°C to 1700°C for 2 to 10 hours, and then the temperature is lowered to a level of about 1200°C to 800°C at a rate of 5°C to 100°C per hour, thereby obtaining the medium of the present inven...

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Abstract

The present invention provides one kind of dielectric ceramic material including solid solution with perovskite crystal as main crystal phase and the perovskite crystal includes the composite oxides of at least Ba, Sr, Mg, W and RE. The dielectric ceramic material is used in dielectric resonator owing to the high dielectric constant and high Q factor in high frequency as well as small temperaturefactor of the resonant frequency.

Description

field of invention [0001] The present invention relates to a novel dielectric ceramic material which exhibits a high relative permittivity and a high Q factor in the high frequency region such as microwaves and millimeter waves, in particular, the present invention relates to a material suitable for manufacturing high Dielectric ceramic materials for high-frequency electronic components, such as dielectric resonators, filters and capacitors, dielectric substrates for microwave integrated circuits (MICs), and waveguides for millimeter-wave applications. Background technique [0002] Dielectric ceramic materials have been widely used for dielectric resonators for high-frequency applications such as microwaves and millimeter waves and dielectric substrates for microwave integrated circuits (MICs). At present, the dielectric stripline has been applied to the millimeter-wave band waveguide. The main requirements for dielectric ceramic materials are as follows: [0003] (1) When...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/465C04B35/468H01B3/12
Inventor 须惠敏幸
Owner KYOCERA CORP