Microwave dielectric ceramic with medium dielectric constant sintered at low temperature and preparation method thereof

Abstract

The invention discloses a microwave dielectric ceramic with medium dielectric constant sintered at low temperature and a preparation method thereof; the composition of the ceramic comprises Ba[5-x]La[x]Ti[x]Nb[4-x]O15, aBaCu2O5 and bBaWO4; wherein x is not less than 2 and not more than 4; a is not less than 3% and not more than 10% and b is not less than 0% and not more than 5%; and a and b are respectively the weight percentage of the BaCuB2O5 and the BaWO4 to the Ba[5-x]La[x]Ti[x]Nb[4-x]O15. The ceramic material has simple chemical composition and preparation process capable of be sintered at the low temperature, meets the co-firing requirement with the silver electrode with low cost, has the microwave dielectric performance: the dielectric constant of 35-45 and high Qf value of more than 10000GHz, and can be used for the preparation of microwave devices such as low-temperature co-firing ceramic systems, multi-layer medium resonator, filter, and the like.

Description

technical field [0001] The invention relates to a low-temperature sintered medium dielectric constant microwave dielectric ceramic and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics refer to ceramics that are used as dielectric materials in microwave frequency band (mainly UHF, SHF frequency band) circuits and perform one or more functions. They are widely used as resonators, filters, and dielectric substrates in modern communications. Chips, dielectric waveguide circuits and other components are the key basic materials of modern communication technology. They have been used in portable mobile phones, car phones, cordless phones, TV satellite receivers, military radars, etc. It is playing an increasingly important role in the process of miniaturization and integration. [0003] The requirements for microwave dielectric components mainly lie in: 1) High dielectric constant to achieve miniaturization; 2) Small dielectric loss, that i...

AI Technical Summary

Problems solved by technology

However, their sintering temperature is above 1400°C, which is much higher than the melting point of Cu and Ag, and they cannot be co-fired with cheap metals, so it is necessary to conduct low-temperature research on them.