A low-temperature sintered composite microwave dielectric ceramic material and its preparation method

Abstract

The invention belongs to the field of electronic ceramics and its manufacture, and in particular relates to a low-temperature sintered composite microwave dielectric ceramic material and a preparation method thereof. The material is composed of BaO‑ZnO‑TiO with a mass percentage of 91% to 99%. 2 The material and the fever reducer are composed of 1% to 9% by mass, and the material of the invention can be obtained through solid phase reaction. BaO‑ZnO‑TiO 2 The composition of the material is BaZn 2 Ti 4 o 11 ‑xTiO 2 (x=1wt%-10wt%); The manufacture raw material of fever reducer is: Li 2 CO 3 , SiO 2 , B 2 o 3 , ZnO, La 2 o 3 , MnCO 3 、BaCO 3 . Its sintering temperature is 850 ℃ ~ 900 ℃, and the dielectric constant is adjustable from 24 to 26, the quality factor Qf is high > 30000 GHz, and the loss is low ≤ 10 ‑4 , The temperature coefficient of resonant frequency is stable near zero-5ppm / ℃~5ppm / ℃, and does not react with silver paste. It is suitable for low-temperature and high-permittivity microwave dielectric core materials in microwave devices such as dielectric resonators, filters, and oscillators in LTCC systems and satellite communications.

Description

technical field [0001] The invention belongs to the field of electronic ceramics and its manufacture, and in particular relates to a low-temperature sintered composite microwave dielectric ceramic material and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics refer to ceramics that are used as dielectric materials in microwave (300MHz to 300GHz) frequency band circuits and perform one or more functions. They are key basic materials in modern communication technology and are widely used in dielectric resonators and filters. , dielectric substrate, dielectric waveguide circuit, microwave capacitor, duplexer, antenna and other microwave components. [0003] With the continuous development of electronic information technology in the direction of high frequency and digitalization, the requirements for miniaturization, integration and modularization of components are becoming more and more urgent. Low Temperature Co-fired Ceramics (LTCC) ha...

AI Technical Summary

Problems solved by technology

One of the traditional methods is to incorporate low melting point oxides, such as B 2 o 3 or V 2 o 5 , while the free B 2 o 3 and V 2 o 5 In the later casting process, it is easy to cause the viscosity of the slurry to be too large and unstable, which limits its practical application

and a negative resonant frequency temperature coefficient (T f ) also limits its application in LTCC

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