A Microwave Dielectric Ceramic with Ultra-low Dielectric Constant Prepared by Reaction Sintering Method

摘要

A CaO-Y2O3 microwave dielectric ceramic with large potential in the 5G field has been prepared using a reaction sintering method. The ceramic has an ultra-low dielectric constant, high Q, and near 0 tau(f). The reaction sintering method could shorten the stages of ceramic preparation, thereby reducing the factors of degradation of microwave dielectric properties caused by complex process fluctuations in the sintering process. The sample is composed of two phases, CaO and Y2O3 , the ceramic particles are closely connected, and the grain boundaries of the two grains are clear. When the sintering temperature is 1400 degrees C, CaO-Y2O3 ceramics have the best microwave dielectric properties of epsilon(r) = 4.30, Qxf = 33,360 GHz, tau(integral )= - 13.79 ppm/degrees C, indicating that it is a good candidate in 5G devices.

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