Microwave ceramic medium and its preparing process

Abstract

A microwave ceramic medium has its formula: mBaO.n[(1-y)Nd2O3.ySm2O3].p[(1-z)TiO2.zSnO2], where m=13.8-18 mole%, n=16-18 mole%, y=0.1-0.9, p=66-68 mole%, z=0-0.1 and m+n+p=100 mole%. Its advantages include high dielectric constant up to 80-82, low loss (Qf=7500-11000 GH2), and adjustable temp. coefficient of resonance frequency.

Description

technical field

[0001] The invention relates to a microwave dielectric ceramic used for microwave components such as a dielectric resonator and a filter in a communication system and a preparation method thereof. Background technique

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

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