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Microwave dielectric ceramic and its preparing process

A technology of microwave dielectric ceramics and content, which is applied in the direction of fixed capacitor dielectric, waveguide devices, resonators, etc., can solve the problems of high frequency of microwave devices and the expansion of application range, and achieve the effect of low loss

Inactive Publication Date: 2003-10-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This greatly limits the further high frequency of microwave devices and the expansion of application range.

Method used

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Examples

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Comparison scheme
Effect test

Embodiment Construction

[0019] Table 1 shows several specific examples of the content of each component of the present invention and their microwave dielectric properties. The preparation method is as described above. The performance test uses powder X-ray diffraction method to analyze the phase of the sintered ceramic samples, and uses the cylindrical dielectric resonator method to evaluate the microwave dielectric properties at 3GHz.

[0020] m

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PUM

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Abstract

The expression of the microwave dielectric ceramic of the present invention is: mBaO.n [(1-y) Nd 2 o 3 .ySm 2 o 3 ].p[(1-z)TiO 2 .zSnO 2 ], the content of each component is respectively: Let the content of BaO be m, 13.8 mol%≤m≤18.0 mol%, (1-y)Nd 2 o 3 .ySm 2 o 3 The content is n, 16.0 mol%≤n≤18.0 mol%, where 0.10≤y≤0.9, (1-z)TiO 2 .zSnO 2 The content of is p, 66.0 mol%≤p≤68.0 mol%, wherein 0<z≤0.1, m+n+p=100 mol%. The microwave dielectric ceramic of the present invention has a high dielectric constant of 80-82, low loss (Qf=7500-11000 GHz) and adjustable resonant frequency temperature coefficient. The microwave dielectric ceramics provided by the invention can adapt microwave components such as dielectric resonators and filters to higher frequencies. At the same time, the ceramics provided by the invention can also be applied to high-frequency ceramic capacitors or temperature compensation ceramic capacitors. Therefore, the present invention has great industrial value.

Description

Technical field [0001] The invention relates to microwave dielectric ceramics used for microwave components such as dielectric resonators and filters in communication systems and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of mobile communication and satellite communication technologies, the demand for microwave dielectric ceramics for microwave components such as dielectric resonators and filters is increasing. [0003] For microwave dielectric ceramics, it is first required to have low dielectric loss (high Q value, Q>3000 at the application frequency) and a temperature coefficient of resonant frequency close to zero (-20ppm / ℃<τ f <20ppm / ℃, for material series with lower dielectric constant, -10ppm / ℃<τ f <10ppm / ℃). At the same time, in order to meet the needs of high frequency, it is required to have the highest possible Q value and the coordination of high dielectric constant ε....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/46C04B35/622H01G4/12H01P7/10
Inventor 陈湘明李怡
Owner ZHEJIANG UNIV
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