Low sintering temperature and low loss microwave ceramic medium and preparation process thereof

Abstract

The invention belongs to the technical field of the manufacturing of a microwave dielectric material, and particularly relates to an oxide-based microwave dielectric ceramics with the low sintering temperature and the low loss and a preparation method thereof. The microwave dielectric ceramics with the low sintering temperature is prepared in a compounding way on the basis of the oxides of Ba, V and W and is the microwave dielectric ceramics which has high quality factor and near zero temperature coefficient, and the chemical expression is xBaO-yV2O5-zWO3; the oxides of Ba, V and W are mixed according to the weight portions in the xBaO-yV2O5-zWO3, and then the compact microwave dielectric ceramics is sintered at the low sintering temperature. The microwave dielectric ceramics provided by the invention belongs to the microwave dielectric ceramics material with the low sintering temperature and the low specific inductive capacity, which can be applied to the design and manufacture of microwave devices such as a multilayer dielectric resonator, a filter and an antenna, etc.,,thus having the great application value in industry.

Description

technical field [0001] The invention belongs to the technical field of microwave dielectric material manufacture, and in particular relates to a low-sintering-temperature and low-loss microwave dielectric ceramic with an oxide-based feature and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics are the core materials of new microwave devices including dielectric resonators, filters, duplexers, antennas, etc., and are widely used in modern communication and navigation systems and equipment. In the past ten years, due to the rapid development of microwave technology and equipment towards miniaturization and integration, especially towards the direction of large output and low price for civilian use, a large number of microwave dielectric ceramic materials suitable for various microwave frequency bands have been developed. Dielectric ceramics used in microwave circuits should meet the following requirements for dielectric characteristics: ...

AI Technical Summary

Problems solved by technology

However, the system for low-fired microwave dielectric ceramics is still relatively limited, which largely limits the development of low-temperature co-firing technology and microwave multilayer devices

[0003] At present, low-temperature co-fired ceramic materials for commercial applications mainly use glass-ceramics or glass-ceramic composite material systems. Because the low-melting glass phase has relatively high dielectric loss, the existence of the glass phase greatly increases the dielectric loss of the material. At the same time Existing low-temperature co-fired ceramic materials generally have a large frequency temperature coefficient, which limits their application in microwave / millimeter-wave multilayer devices. The focus of the research, the international research and development of this type of material is being actively carried out

At present, there are few reports on the glass-free low-temperature co-fired microwave dielectric ceramic material system. Most of the few low-fired material systems are rich in chemical elements such as bismuth and tellurium. These low-fired material systems not only have a large frequency temperature coefficient and high microwave loss. Disadvantages, there is also a problem of co-firing compatibility with silver electrodes during the co-firing process, which greatly limits their application in multilayer microwave devices

At present, low-temperature sintered low-loss microwave dielectric materials with a dielectric constant of about 10 and a near-zero temperature coefficient that can meet the requirements of practical applications have not been reported.