CA-TI-based high-dielectric microwave ceramic substrate material and its preparation method and application

Abstract

The invention provides a Ca-Ti-based high-dielectric microwave ceramic substrate material and its preparation method and application. It is composed of two crystal phases, namely rutile TiO 2 and CaTiO 3 . CaTiO after B site substitution 3 Phase and TiO 2 Combination forms a ceramic material with adjustable and controllable properties. Other dopants play a role in inhibiting the reduction of Ti and improving the Q×f value of the ceramic material. The general chemical formula of the material is: Ca(B b Ti 1‑b )O 3 +aTiO 2 +cZnO+dD; the preparation method includes batching, ball milling, granulation, molding, and sintering. The Ca-Ti-based microwave ceramic substrate material prepared by this method has a high Q×f value (8000-12000) through laboratory research and testing. High dielectric constant (145-165) and serialized dielectric constant temperature coefficient (‑1500±500), the composite ceramics of the present invention are suitable for making substrate materials for microwave capacitors, and can also be used for making adjustable microwave capacitors such as microstrip filters. The material of the device.

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 ignored, and their machinability has never been considered. Therefore, there is an urgent need to develop a process Simple, low raw material cost, microwave dielectric ceramic material that meets the requirements of high dielectric constant and low loss characteristics at the same time, and realizes the precision machining of microstrip line ceramics by controlling the microstructure of microstrip line ceramics to meet the requirements of microstrip technology , can also adapt to the ultra-miniature microwave capacitor processing technology to meet the application requirements of the high-frequency microwave communication industry

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