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Low temperature sintered (Ca, Mg) SiO3 microwave dielectric ceramic and its prepn process

A technology of microwave dielectric ceramics and low-temperature sintering, applied in ceramics, inorganic insulators, etc., can solve the problems of large dielectric loss, achieve high Qf value, good reproducibility, and reduce production costs

Inactive Publication Date: 2005-09-28
ZHEJIANG UNIV +1
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Problems solved by technology

It can be seen from the table that the dielectric loss of the material is relatively large, DF>1×10 -3 , that is, Qf Meet the requirements of RF components (-10ppm / ℃f <10ppm / ℃), other materials cannot meet the requirements

Method used

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with embodiment.

[0016] First, pure calcium carbonate (CaCO 3 ), light magnesium oxide (MgO), silicon dioxide (SiO 2 ) Press (Ca 1-x Mg x ) SiO 3 Chemical formula ingredients, mixed by wet ball milling method for 24 hours (solvent is deionized water), pre-fired for 6 hours at 1100-1150°C in the atmosphere after drying, and the main component (Ca 1-x Mg x ) SiO 3 . Analytical pure calcium carbonate and chemically pure titanium dioxide are mixed in a molar ratio of 1:1, mixed by wet ball milling for 24 hours (the solvent is deionized water), and pre-fired at 1100-1150 °C for 6 hours in the atmosphere after drying to synthesize the secondary component CaTiO 3 .

[0017] Second, the synthesized (Ca 1-x Mg x ) SiO 3 , CaTiO 3 and Li 2 CO 3 , V 2 o 5 The raw materials are mixed by wet ball milling method for 24 hours according to the composition of porcelain materials (the solvent is indust...

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Abstract

The present invention relates to low temperature sintered microwave dielectric ceramic for dielectric antenna, filter and other RF elements and devices in mobile communication system and its preparation process. The low temperature sintered microwave dielectric ceramic has (Ca, Mg)SiO3 as main component, CaTiO3 for regulating the temperature coefficient of frequency, and Li2CO3 and V2O5 as sintering assistant. The present invention features Li2CO3 and V2O5 lowering the sintering temperature of the ceramic system to below 900 deg.c, special technological process improving the characteristic of powder and slurry matching with silver electrode, the dielectric constant of 8-10, quality factor higher than 25000 GHz, the temperature coefficient of resonant frequency approaching zero, low cost, etc.

Description

technical field [0001] The invention relates to low-temperature sintered microwave dielectric ceramics and a preparation process for radio frequency components such as multilayer chip dielectric antennas, baluns, filters and modules used in mobile communication systems, and belongs to the field of material science and technology. Background technique [0002] The third-generation mobile communication system, which is characterized by high-speed data transmission and can transmit images, puts forward new requirements for communication equipment, and will undoubtedly lead to a revolution in a new generation of mobile terminals. WCDMA, CDMA2000 and TD-SCDMA have been recognized by the International Telecommunications Union (ITU) as 3G standards, and will be compatible with the second generation of mobile communication and put into operation on the basis of it. Therefore, mobile communication terminals must meet the needs of multi-mode and multi-band work....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/04C04B35/14C04B35/465C04B35/622C04B35/63C04B35/634C04B35/64H01B3/12
Inventor 张启龙杨辉孙慧萍邹佳丽
Owner ZHEJIANG UNIV
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