Microwave medium ceramic and preparing method thereof

Abstract

The invention disclose a microwave medium ceramic, including main component: p[m(aCaO.bNd2O3) .cMgO.TiO2].q[1 / 4Li2O.1 / 4Sm2O3.TiO2], where according to mol percent, p+q=100mol%, m+c=1, a+3b=1, q is not less than 30 mol% and not greater than 55 mol%, a not less than 0.3 mol and not greater than 0.75 mol, and m not less than 0.8 mol and not greater than 0.95 mol; auxiliary component ZnO, 0.5-20wt% of the main component. It also provides preparing method. Its dielectric constant is 90-120, and it has low-loss and adjustable harmonic frequency temperature coefficient, and can make microwave devices such as medium resonator and filter adaptive to higher frequency. It can be applied to high frequency ceramic capacitor or temperature compensating capacitor, and so on.

Description

technical field

[0001] The invention belongs to the technical field of microwave dielectric ceramics, in particular to a microwave dielectric ceramic and a preparation method thereof. The microwave dielectric ceramic can be used for microwave components such as dielectric resonators and filters in communication systems. Background technique

[0002] In recent years, with the rapid development of mobile communication and satellite communication technology, the demand for microwave dielectric ceramics for microwave components such as dielectric resonators and filters is increasing.

[0003] For high-performance microwave dielectric ceramics, it is first required to have low dielectric loss (high Q value, at the corresponding application frequency, Q>3000) and a temperature coefficient of resonant frequency close to zero (-20ppm / ℃<τ f <20ppm / ℃, for material series with lower dielectric constant, -10ppm / ℃<τ f <10ppm / ℃), at the same time, in order to meet the nee...