Aluminate-based low-dielectric microwave dielectric ceramic and preparation method thereof

Abstract

The invention discloses an aluminate-based low-dielectric microwave dielectric ceramic and a preparation method thereof. The main crystal phase of the microwave dielectric ceramic has a garnet type crystal structure, the specific chemical composition is (2+x)CaO-0.5Ln2O3-(2-y)ZrO2-(x+y)MO2-1.5Al2O3, Ln is Y, La, Lu, Gd or other lanthanide elements, M is Hf, Sn or Ti, x is more than or equal to 0 and less than or equal to 0.5, and y is more than or equal to 0 and less than or equal to 2.0. The dielectric constant of the microwave dielectric ceramic ranges from 10.81 to 13.52, the quality factor ranges from 72441 GHz to 121930 GHz, and the temperature coefficient of resonance frequency ranges from +0.50 ppm / DEG C to -35.48 ppm / DEG C. In the preparation process, the pre-sintering condition of the ceramic material is that the temperature is kept at 1300 DEG C for 5 hours, and the sintering condition is that the temperature is kept at 1500-1600 DEG C for 10 hours. The microwave dielectric ceramic prepared in the invention has the characteristics of low dielectric constant, high quality factor and adjustable resonant frequency temperature coefficient to near zero, and is suitable for preparing microwave communication devices such as dielectric substrates, dielectric resonators, dielectric antennas and the like.

Description

technical field [0001] The invention belongs to the technical field of microwave dielectric ceramics, and more specifically relates to an aluminate-based low dielectric microwave dielectric ceramic and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics are the basic materials for preparing passive devices such as high-frequency capacitors, dielectric substrates, dielectric waveguide filters, and dielectric antennas, and are therefore widely used in various wireless communication systems. As 5G communication gradually enters the commercial stage, the integration level and operating frequency of communication equipment continue to increase, and problems such as signal delay, signal crosstalk, and system heating become increasingly prominent. Microwave dielectric ceramics with low dielectric constant and low dielectric loss can effectively increase the transmission rate of microwave signals and reduce signal energy loss, which meets the ne...

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Problems solved by technology

[0003] Aiming at the deficiencies in the prior art, the present invention provides an aluminate-based low dielectric microwave dielectric ceramic and its preparation method, thereby alleviating the microwave Problems such as high signal delay, high energy loss, and high system heating in communication technology

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