Low dielectric constant microwave dielectric ceramic material

Abstract

The invention provides a microwave medium ceramic material with low dielectric constant, low deterioration and good thermal stability. The material is a solid solution medium ceramic with a formula of uZnO-vSiO2-wTiO2, wherein 58.0 mol%<=u<=69.0 mol%, 28.0 mol%<=v<=35.0 mol%, 3.0 mol%<=w<=7 mol%, the principal crystalline phase is Zn2SiO4, the secondary crystalline is TiO2.

Description

technical field [0001] The invention belongs to microwave dielectric ceramic materials, in particular to low dielectric constant microwave dielectric ceramic materials for microwave components such as dielectric antennas and dielectric substrates in communication systems. Background technique [0002] In recent years, because low dielectric constant microwave dielectric ceramic materials can be used to make dielectric antennas, dielectric substrates and other key components in microwave communication systems and microwave circuits, they have been widely used commercially and in the military. The requirements of these applications for low dielectric constant microwave dielectric ceramic materials are: (1) a certain dielectric constant (ε r ); (2) low loss (that is, high quality factor or Q*f (GHz) value); (3) temperature coefficient of resonant frequency (TCf) tending to zero, to ensure that the device has a good performance when the temperature fluctuates stability. These ...

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Problems solved by technology

These requirements greatly limit the application of most ceramic materials in practical devices

Although a series of low dielectric constant microwave dielectric ceramic materials have been developed, such as MgTiO 3 -CaTiO 3 and Ba(Zn 1 / 3 Nb 2 / 3 )O 3 etc., but its dielectric constant is generally above 20, and there are few microwave dielectric ceramic materials with a dielectric constant lower than 10.