Microwave dielectric ceramic, preparation method thereof and microwave device

Abstract

The invention relates to a microwave dielectric ceramic and a preparation method thereof and a microwave device. The microwave dielectric ceramic contains MgTiO3 crystal grains and CaTiO3 crystal grains; the CaTiO3 crystal grains are distributed among the MgTiO3 crystal grains in an embedded manner, the particle size D50 of the CaTiO3 crystal grains is 1.5-3.5 microns, the number of the CaTiO3 crystal grains with the particle size of 1-7 microns accounts for not less than 99% of the number of all the CaTiO3 crystal grains, and based on any cross-sectional area of the microwave dielectric ceramic, the proportion of the cross-sectional area of the CaTiO3 crystal grains is 3.5-5%. The microwave dielectric ceramic provided by the invention is formed by closely arranging the MgTiO3 crystal grains and the CaTiO3 crystal grains which are uniformly distributed among the MgTiO3 crystal grains in an embedded manner, and the sizes of the CaTiO3 crystal grains are uniform, so that the microwave dielectric ceramic is relatively good in uniformity and consistency, relatively high in density and strength and excellent in dielectric property, and when the microwave dielectric ceramic is used for processing and preparing a microwave device, the processing procedure is simple, and the processing cost is low.

Description

technical field [0001] The present disclosure relates to the technical field of ceramic materials, in particular, to a microwave dielectric ceramic, a preparation method thereof, and a microwave device prepared by using the microwave dielectric ceramic. Background technique [0002] Microwave dielectric ceramics refer to specific functional materials used in microwave frequency band (mainly UHF, SHF frequency band, 300MHz ~ 300GHz) circuits as dielectric materials and complete one or more functions. They are used in modern communications for resonators, In microwave devices such as filters, dielectric substrates, dielectric antennas, and dielectric waveguide circuits. Compared with metal cavity microwave devices with air or local dielectric materials as the medium, microwave devices prepared by microwave dielectric ceramics have excellent characteristics such as high dielectric constant, low loss, and low vibration frequency temperature coefficient, which promotes microwave ...

AI Technical Summary

Problems solved by technology

[0003] The existing microwave dielectric ceramics have a large deformation before and after sintering, and the internal stress generated makes the proportion of cracks inside the microwave dielectric ceramic products higher, which leads to a low pass rate of microwave dielectric ceramic products, and the uniformity, consistency and dielectric properties Both are poor. When using such microwave dielectric ceramics to process and prepare microwave devices, the processing procedures are complicated and the processing costs are high.

Images