Ca-Ti-based high-dielectric microwave ceramic substrate material, and preparation method and application thereof

Abstract

The invention provides a Ca-Ti-based high-dielectric microwave ceramic substrate material, and a preparation method and an application thereof. The material is composed of two crystal phases, namely rutile type TiO2 and CaTiO3. A B-position substituted CaTiO3 phase is compounded with TiO2 to form a ceramic material with adjustable and controllable performances, other doping agents play roles in inhibiting Ti reduction and increasing the Q * f value of the ceramic material, and the general chemical formula of the material is Ca(BbTi1-b)O3 + aTiO2 + cZnO + dD. The preparation method comprises the following steps: burdening, ball-milling, granulating, forming and sintering. Results of laboratory research and test show that the Ca-Ti-based microwave ceramic substrate material prepared by the method has a high Q * f value (8000-12000), a high dielectric constant (145-165) and a serialized dielectric constant temperature coefficient (-1500 +/- 500). The composite ceramic is suitable for manufacturing substrate materials of microwave capacitors, and can also be used for manufacturing materials of adjustable microwave devices such as a microstrip filters.

Description

technical field [0001] The invention relates to a Ca-Ti-based high-dielectric microwave ceramic substrate material suitable for microwave capacitors and microstrip filters, a preparation method and application thereof, and belongs to the field of substrate materials for advanced communication components. Background technique [0002] With the rapid development of electronic information technology, the requirements for the integration, reliability, stability and miniaturization of electronic components are getting higher and higher. Today, the fifth generation (5G) communication network has been applied and vigorously promoted in many countries. It is an inevitable trend that information technology develops in the direction of high frequency, high power, integration and multi-function, and its development speed is rapid. Ceramic filters are becoming more and more important between system modules and communication terminals. At the same time, with the increasing development ...

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Problems solved by technology

However, the Q×f value of the ceramic is very low (2750GHz), and the article failed to evaluate whether it can meet the processing requirements of the fine grain structure on the surface of the microstrip filter, and did not test the dielectric temperature coefficient of the modified ceramic material. It is not possible to determine whether it meets the actual application requirements

[0004] The high-medium microwave dielectric ceramic materials currently researched are trying their best to pursue their stable frequency-temperature characteristics, and the increase in ceramic loss during the modification process has been ignor

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