High-Q-value medium-dielectric-constant microwave dielectric ceramic and preparation method thereof

Abstract

The invention discloses a high-Q-value medium-dielectric-constant microwave dielectric ceramic and a preparation method thereof and relates to a microwave dielectric ceramic. According to the invention, a novel material system is adopted as follows: xCaTiO3-(1-x)LaGaO3 (x is 0.66-0.62) microwave dielectric ceramic is obtained by compounding a calcium titanate (CaTiO3) phase with a lanthanum gallate (LaGaO3) phase; the microwave dielectric ceramic comprises the following components by weight percent: 25-35% of CaCO3, 15-30% of TiO2, 20-35% of La2O3 and 10-25% of Ga2O3, wherein the purities of CaCO3 and TiO2 are more than or equal to 99.0%, and the purities of La2O3 and Ga2O3 are more than or equal to 99.9%. The high-Q-value medium-dielectric-constant microwave dielectric ceramic disclosed by the invention is good in microwave dielectric property, simple in production technical process and good in repeatability, can be widely applied to preparation of good-property microwave devices such as a dielectric resonator, a filter and a duplexer and meets the technical requirements of systems such as a communication base station.

Description

technical field [0001] The invention relates to microwave dielectric ceramics, in particular to a calcium carbonate (CaTiO 3 ) and lanthanum gallate (LaGaO 3 ) composite microwave dielectric ceramic with high Q value and medium dielectric constant and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics refer to ceramics that are used as dielectric materials in microwave frequency circuits and perform one or more functions; they have the characteristics of low loss, small frequency temperature coefficient, and high quality factor; they are widely used as resonance in modern communications Electronic components such as devices, filters, duplexers, dielectric substrates, dielectric waveguide transmission lines and antennas. These components are widely used in many fields such as mobile communication, satellite TV broadcasting communication, radar and global satellite positioning and navigation system, and are playing an increasingly impor...

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Problems solved by technology

However, domestic scholars have found that the xCaTiO prepared by the traditional solid-state reaction method 3 -(1-x)LnAlO 3 (x=0.7, Ln=Nd, La) system microwave dielectric ceramics are difficult to meet the performance indicators of similar foreign products, especially Q×f is far lower than foreign products (Q×f≤40000GHz)

The series of ceramics used in industrial production are also mainly purchased from Japan to synthesize xCaTiO 3 -(1-x)NdAlO 3 System microwave dielectric ceramic powder greatly increases the cost of industrial production and limits its application in industrial production

Some domestic scholars have also reported that xCaTiO with excellent performance has been prepared by using polymer precursors and other methods. 3 -(1-x)NdAlO 3 System ceramics, however, this method is expensive, the process is complicated, and it is not suitable for large-scale production

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