Microwave ceramic medium and its preparing process
A microwave dielectric ceramic and content technology, which is applied in the direction of fixed capacitor dielectrics, waveguide devices, resonators, etc., can solve the problems of high frequency and application range expansion of microwave devices, and achieve the effect of low loss
Inactive Publication Date: 2002-04-03
ZHEJIANG UNIV
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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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[0019] Table 1 shows several specific examples of the content of each component constituting the present invention and their microwave dielectric properties. Its preparation method is as described above. Performance testing The powder X-ray diffraction method is used to analyze the phase of the sintered ceramic sample, and the dielectric performance of the microwave is evaluated at 3 GHz by the cylindrical dielectric resonator method.
[0020] m
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Abstract
A microwave ceramic medium has its formula: mBaO.n[(1-y)Nd2O3.ySm2O3].p[(1-z)TiO2.zSnO2], where m=13.8-18 mole%, n=16-18 mole%, y=0.1-0.9, p=66-68 mole%, z=0-0.1 and m+n+p=100 mole%. Its advantages include high dielectric constant up to 80-82, low loss (Qf=7500-11000 GH2), and adjustable temp. coefficient of resonance frequency.
Description
technical field [0001] The invention relates to a microwave dielectric ceramic used for microwave components such as a dielectric resonator and a filter in a communication system and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of mobile communication and satellite communication technology, the demand for microwave dielectric ceramics used in 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 close to zero resonant frequency temperature coefficient (-20ppm / ℃<τ f <20ppm / ℃, for material series with lower dielectric constant, -10ppm / ℃<τ f <10ppm / °C). At the same time, in order to meet the needs of high frequency, the coordination of Q value as high as possible and high dielectric constant ε is required. ...
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IPC IPC(8): C04B35/46C04B35/622H01G4/12H01P7/10
Inventor 陈湘明李怡
Owner ZHEJIANG UNIV
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