Microwave dielectric ceramic with low loss and low temperature coefficient of frequency and its prepn

Abstract

Microwave dielectric ceramics with low loss and low frequency temperature coefficient and a preparation method thereof belong to the field of microwave dielectric materials and their manufacturing technology. The ratio of elements Ba, Eu, Nd and Ti contained in the microwave dielectric ceramics satisfies the chemical formula Ba6-3x(Eu1- y, Ndy)8+2xTi18O54, where x=0-1 and y=0.2-0.8; the microwave dielectric ceramic is made from barium carbonate, neodymium oxide, europium oxide and butyl titanate as main raw materials. The present invention provides a formula for a new microwave medium material containing rare earth, which expands the selection range of microwave medium application materials; and provides a reasonable new process for the material of the present invention, that is, the preparation of powder and solid-phase reaction by sol-gel method Combining the method to prepare ceramics, the microwave dielectric ceramics have a good quality factor, a low frequency temperature coefficient, and at the same time reduce the sintering temperature, thereby reducing the energy consumption of material preparation.

Description

Technical field [0001] The invention belongs to the technical field of microwave dielectric materials and their manufacturing, and particularly relates to microwave dielectric ceramics used in microwave devices such as dielectric resonators and multilayer filters in mobile and satellite communications systems. Background technique [0002] Microwave dielectric ceramics are used in microwaves, satellite communications, mobile communications, electronic countermeasures equipment, etc. They are key materials for microwave components such as resonators, filters, and dielectric waveguides that are widely used in modern communications. They play a role in microwave circuit systems. A series of circuit functions such as dielectric isolation, dielectric waveguide and dielectric resonance. The ideal microwave dielectric ceramics have a high relative permittivity, low loss, that is, a high quality factor Q·f value (GHz) and a temperature coefficient of resonance frequency τ tending to zero...

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Problems solved by technology

However, there are still problems to be solved in these methods, such as the high production cost of the co-precipitation method, which is difficult to carry out large-scale production, and the uneven microscopic distribution of raw materials in the conventional solid-phase method makes it difficult to fully react to obtain a high-purity target phase; It is easy to introduce impurities, which may damage the performance of ceramic materials; the sintering temperature of ceramics is also high

At the same time, the selection of the material preparation method needs to meet certain requirements of the crystal structure and crystal growth of the prepared material. The same preparation method such as the sol-gel method will produce different effects when preparing different materials, such as the crystal grain is too small This leads to the volatilization of material components and the poor density of the prepared materials.

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