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A millimeter wave dielectric ceramic

A dielectric ceramic, millimeter wave technology, applied in the field of millimeter wave communication, can solve the problems of excessive dielectric constant, excessive temperature coefficient of resonant frequency, unable to meet the requirements of millimeter wave application, etc., and achieve the effect of good temperature stability

Active Publication Date: 2022-07-26
ZHEJIANG UNIV
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  • Abstract
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Problems solved by technology

[0003] Although the existing Ba-based composite perovskite ceramics have ultra-low loss and near-zero frequency temperature coefficient, their dielectric constant is too large (>20), which cannot meet the requirements of millimeter wave applications.
MgAl 2 o 4 ,,Mg 2 SiO 4 , Zn 2 SiO 4 Ceramics, etc. have problems such as excessive temperature coefficient of resonant frequency and difficult control of Q value.

Method used

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  • A millimeter wave dielectric ceramic

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Embodiment Construction

[0013] First, HfO with a purity of 99.9% or more is 2 , TiO 2 with SiO 2 Proportionally mixed with wet ball milling for 24 hours (solvent is absolute ethanol), adding binder, followed by granulation, and then shaped by uniaxial pressure at 1000kg / cm 2 A ceramic green body with a diameter of 6 mm and a thickness of 3-6 mm was prepared under the pressure of 100 °C, and finally sintered at 1375° C.-1450° C. in an atmospheric atmosphere for 3 hours to prepare the desired millimeter wave dielectric ceramic.

[0014] The evaluation of millimeter-wave dielectric properties was carried out at 30 GHz by the high-order mode cylindrical dielectric resonator method.

[0015] The relationship between the millimeter-wave dielectric properties and the composition of the materials in the examples is shown in Table 1. As can be seen from Table 1, in the ceramic system of the present invention, with TiO 2 As the content increases, the dielectric constant of the material tends to increase, τ...

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Abstract

The invention provides a millimeter-wave dielectric ceramic, and the general expression of its formula is: xHfO 2 ·yTiO 2 ·zSiO 2 . Wherein 75.0mol%≤x≤97.0mol%, 3.0mol%≤y≤25.0mol%, 0mol%≤z≤5.0mol%, and x+y+z=100%. The millimeter wave dielectric ceramic provided by the invention has a dielectric constant of 10-20, a Q value of as high as 5,000-9,000 (at 30 GHz), and has a near-zero resonant frequency temperature coefficient. Using the millimeter-wave dielectric ceramic provided by the present invention can make microwave components such as dielectric resonators and filters suitable for millimeter-wave applications, and is expected to solve key material problems for future mobile communications. Therefore, the present invention has great industrial value.

Description

technical field [0001] The invention relates to the field of millimeter wave communication, in particular to a millimeter wave dielectric ceramic for resonators and filters. Background technique [0002] In recent years, with the rapid development of mobile communication and satellite communication technology, the demand for microwave dielectric ceramics for microwave components such as dielectric resonators and filters is increasing. With the rapid development of mobile communication to the millimeter wave band, urgent requirements are put forward for low dielectric constant and ultra-low loss millimeter wave dielectric ceramics. Its basic performance requirements are: dielectric constant ε r ≤20, quality factor Q=5,000GHz (at millimeter wave frequency), resonant frequency temperature coefficient τ f =0±10ppm / °C. [0003] Although the existing Ba-based composite perovskite ceramics have ultra-low loss and near-zero photofrequency temperature coefficient, their dielectric...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/49C04B35/622
CPCC04B35/49C04B35/622C04B2235/3418C04B2235/602C04B2235/656C04B2235/6567C04B2235/6583
Inventor 陈湘明丁艺含
Owner ZHEJIANG UNIV