Microwave dielectric ceramic material and preparation method thereof

Abstract

The invention provides a microwave dielectric ceramic material with an adjustable dielectric constant and a near-zero frequency temperature coefficient and a preparation method thereof. The microwave dielectric ceramic material includes a main crystal phase and a modification additive, and the structural formula of the main crystal phase is xAl 2 o 3 -yMg 2 TiO 4 ‑zCaTiO 3 , wherein: x+y+z=1.0, 0.2≤x≤0.6, 0.3≤y≤0.75, 0.05≤z≤0.10; the modified additive is MnCO 3 , SnO 2 , Ga 2 o 3 Any one or a mixture of two or more of them. The microwave dielectric ceramic material of the present invention has the following advantages: 1) The dielectric constant is adjustable in a wide range, and εr is adjustable from 12 to 17; 2) It has low loss: Q*f≥60000GHz; 3) Near zero frequency The temperature coefficient τf is 0±5ppm / ℃; 4) The raw materials are cheap and easy to obtain, non-toxic and environmentally friendly; 5) The preparation process is simple, no special equipment and harsh process conditions are required, it is suitable for industrial production, and can be widely used in various fields of microwave communication.

Description

technical field [0001] The invention relates to a microwave dielectric ceramic material and a preparation method thereof, belonging to the field of electronic information materials and components, in particular to a microwave dielectric ceramic material with an adjustable frequency temperature coefficient of a dielectric constant and a preparation method thereof. Background technique [0002] With the rapid development of microwave application technologies such as ground mobile communication, vehicle radar, satellite live TV, global satellite positioning system (Beidou, GPS), high-end frequency, integration, miniaturization and low cost have become the inevitable development of microwave technology. trend. Microwave ceramic materials can be used to make dielectric resonators, dielectric filters, duplexers, microwave dielectric antennas, dielectric frequency stabilized oscillators, dielectric waveguide transmission lines, etc. These devices are widely used in various fields ...

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Problems solved by technology

[0006] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a microwave dielectric ceramic material with an adjustable dielectric constant and a near-zero frequency temperature coefficient and a preparation method thereof, which is used to solve the problems of the microwave dielectric ceramic material in the prior art. The temperature coefficient of frequency is large and negative, and the temperature stability of the device is poor.

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