CN110511028B - Ultra-low loss microwave dielectric ceramic - Google Patents

Ultra-low loss microwave dielectric ceramic Download PDF

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CN110511028B
CN110511028B CN201910828606.7A CN201910828606A CN110511028B CN 110511028 B CN110511028 B CN 110511028B CN 201910828606 A CN201910828606 A CN 201910828606A CN 110511028 B CN110511028 B CN 110511028B
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李雷
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陈湘明
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Zhejiang University ZJU
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Abstract

The invention discloses an ultra-low loss microwave dielectric ceramic, whose expression is SrLa [ Ga ]1‑x(Mg0.5Ti0.5)x]O4(0.2≤x≤0.6)、SrLa[Ga1‑x(Zn0.5Ti0.5)x]O4(x is more than or equal to 0.1 and less than or equal to 0.5) and Sr1+xLa1‑xGa1‑xTixO4(x is more than or equal to 0.3 and less than or equal to 0.7). The microwave dielectric ceramic has medium dielectric constant (21-27), ultra-low loss (Qf: 71800-134000 GHz) and near-zero temperature coefficient of resonance frequency (-10 ppm/DEG C). The microwave dielectric ceramic provided by the invention can be used for key components such as dielectric resonators, filters, antennas and the like in a microwave communication system, and the components are suitable for application under higher frequency.

Description

Ultra-low loss microwave dielectric ceramic
Technical Field
The invention relates to a low-loss microwave dielectric ceramic, in particular to an ultralow-loss microwave dielectric ceramic used for key components of microwave communication systems such as microwave dielectric resonators, filters, antennas and the like.
Background
The low-loss microwave dielectric ceramic is widely applied to key components and parts in microwave communication systems such as microwave dielectric resonators, filters, antennas and the like, and the basic performance indexes and requirements are as follows: appropriate dielectric constantrLow loss (or high Qf value) and near-zero temperature coefficient of resonance frequency tauf. In recent years, the application of microwave communication technologies including satellite communication and 5G/6G mobile communication to higher frequencies has become an important trend, which puts higher demands on the overall performance, especially ultra-low loss, of microwave dielectric ceramics. Development ofr＝20～30、Qf>70000GHz、|τf|<The ultra-low loss microwave dielectric ceramic with the concentration of 10 ppm/DEG C has important significance for further development of microwave communication technology.
Disclosure of Invention
The inventionAims to provide an ultra-low loss microwave dielectric ceramic, the performance of the microwave dielectric ceramic can reachr＝21～27、Qf＝71800～134000GHz、|τf|<10ppm/℃。
The expression of the ultra-low loss microwave dielectric ceramic is SrLa [ Ga ]1-x(Mg0.5Ti0.5)x]O4(0.2≤x≤0.6)、SrLa[Ga1-x(Zn0.5Ti0.5)x]O4(x is more than or equal to 0.1 and less than or equal to 0.5) and Sr1+xLa1-xGa1-xTixO4(0.3≤x≤0.7)。
On the basis of comprehensively examining the existing low-loss microwave dielectric ceramic system, the invention provides the microwave dielectric ceramic with ultralow loss (Qf: 71800-134000 GHz), medium dielectric constant (21-27) and near-zero resonant frequency temperature coefficient by focusing on the gallium-based compound solid solution with a layered perovskite structure. The microwave dielectric ceramic with ultra-low loss provided by the invention can be used for making key components in microwave communication systems such as dielectric resonators, filters, antennas and the like suitable for application under higher frequency. Therefore, the invention has important application value in industry.
Detailed Description
The invention is further illustrated below with reference to examples.
The ultra-low loss microwave dielectric ceramic can be prepared by the following method.
Firstly, SrCO with the purity of more than 99 percent3、La2O3、Ga2O3、MgO、ZnO、TiO2The powder is mixed for 24 hours by a wet ball milling method according to the stoichiometric proportion, and calcined for 3 hours at 1200-1400 ℃ after being dried and sieved. Ball-milling the calcined powder again, drying, sieving, adding a binder for granulation, and applying 1000kg/cm2Uniaxial pressure molding. And finally sintering for 3 hours at 1300-1600 ℃ to obtain the required microwave dielectric ceramic.
The sintered ceramic sample was subjected to phase analysis by powder X-ray diffraction, and the microwave dielectric properties were measured at 10GHz by dielectric resonance.
Tables 1-3 show several specific examples of ultra low loss microwave dielectric ceramics comprising the present invention and their microwave dielectric properties.
TABLE 1 SrLa [ Ga ]1-x(Mg0.5Ti0.5)x]O4The microwave dielectric properties of the ceramic.
Figure BDA0002189914480000021
TABLE 2 SrLa [ Ga ]1-x(Zn0.5Ti0.5)x]O4The microwave dielectric properties of the ceramic.
Figure BDA0002189914480000022
TABLE 3 Sr1+xLa1-xGa1-xTixO4The microwave dielectric properties of the ceramic.
Figure BDA0002189914480000023
As can be seen from tables 1 to 3, SrLa [ Ga ]1-x(Mg0.5Ti0.5)x]O4、SrLa[Ga1-x(Zn0.5Ti0.5)x]O4And Sr1+xLa1- xGa1-xTixO4Of three ceramicsrAnd τfQf is maintained at a high value as x increases. The Qf values are all higher than 70000GHz, tau in the given composition rangefNear zero, within + -10 ppm/DEG C. And beyond this range, τfThe deviation from zero is more. Therefore, the composition range of the invention is defined as follows: SrLa [ Ga ]1-x(Mg0.5Ti0.5)x]O4(0.2≤x≤0.6)、SrLa[Ga1-x(Zn0.5Ti0.5)x]O4(x is more than or equal to 0.1 and less than or equal to 0.5) and Sr1+xLa1-xGa1-xTixO4(0.3≤x≤0.7)
In the composition of each group in this embodimentComposition point SrLa [ Ga ]0.6(Mg0.5Ti0.5)0.4]O4、SrLa[Ga0.7(Zn0.5Ti0.5)0.3]O4And Sr1.5La0.5Ga0.5Ti0.5O4Respectively has the following optimal comprehensive microwave dielectric properties:r＝23.3、Qf＝89400GHz、τf＝-0.8ppm/℃；r＝23.0、Qf＝76200GHz、τf＝-0.2ppm/℃；r＝23.3、Qf＝129700GHz、τf＝-1.7ppm/℃。

Claims (2)

1. the ultra-low loss microwave dielectric ceramic is characterized in that: the dielectric ceramic is a gallium-based compound solid solution with a layered perovskite structure, and the expression of the solid solution is Sr1+xLa1-xGa1-xTixO4(0.3≤x≤0.7)。
2. The ultra-low loss microwave dielectric ceramic of claim 1, wherein: the expression of the dielectric ceramic is Sr1.5La0.5Ga0.5Ti0.5O4。
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