A silicate-based low dielectric microwave dielectric ceramic and its preparation method
A microwave dielectric ceramic and silicate technology, applied in ceramics, inorganic insulators, etc., can solve the problems of increased system loss and heat generation, poor system stability, etc., to achieve good performance, high quality factor, and improved transmission rate. Effect
Active Publication Date: 2020-06-02
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
[0003] In view of the above defects or improvement needs of the prior art, the present invention provides a silicate-based low dielectric microwave dielectric ceramic and its preparation method, thereby solving the problem of signal delay caused by the continuous increase in the operating frequency of communication equipment in the prior art. become more obvious, system loss and heat generation will also increase, and the technical problem of system stability will gradually deteriorate
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[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0024] Such as figure 1 Shown, a kind of preparation method of silicate-based low dielectric microwave dielectric ceramics comprises:
[0025] (1) CaCO with a purity of more than 99.5% 3 , SrCO 3 、BaCO 3 , MgO, CuO and SiO 2 According to chemical formula A x BSi y o 1+x+2y Carry out batching, obtain mixed raw material, wherein, A is Ba 1-z Sr z 、 Ba 1-z Ca z or Sr. 1-z Ca z , B is ...
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Abstract
The invention discloses silicate-base low-dielectric microwave medium ceramics and a preparation method thereof. The microwave medium ceramics comprise a main crystal phase, wherein a chemical formulaof the main crystal phase is AxBSiyO1+x+2y, wherein A is Ba1-zSrz, Ba1-zCaz or Sr1-zCaz, B is Cu or Mg, x is greater than or equal to 0.5 and less than or equal to 2, y is greater than or equal to 1and less than or equal to 4, and z is greater than or equal to 0 and less than or equal to 1. The dielectric constant of the microwave medium ceramics is 4.2 to 12, and a quality factor of the microwave medium ceramics is 7729 GHz to 82071 GHz. A resonant frequency temperature coefficient of the microwave medium ceramics is -60 ppm / DEG C to -1.2 ppm / DEG C. In the preparation process, the sinteringtemperature is 950 to 1125 DEG C. In conclusion, the sintering temperature range in preparation is large, the prepared microwave medium ceramics has the characteristics that the dielectric is low, the quality factor is high, and the resonant frequency temperature coefficient can be regulated to be close to zero.
Description
technical field [0001] The invention belongs to the technical field of microwave dielectric ceramics, and more specifically relates to a silicate-based low dielectric microwave dielectric ceramic and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics refer to ceramic materials used as dielectric materials in microwave frequency band (300MHz ~ 300GHz) circuits. With the advent of the 5G era and the continuous increase in the operating frequency of communication equipment, the signal delay phenomenon will become more obvious, the system loss and heat generation will also increase, and the system stability will gradually deteriorate. The low dielectric constant can reduce the interaction coupling loss between the material and the electrode, and increase the transmission rate of electrical signals. Therefore, the research on low dielectric and ultra-low dielectric microwave dielectric ceramics is particularly important. Contents of the i...
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IPC IPC(8): H01B3/12C04B35/16
CPCC04B35/16C04B2235/3206C04B2235/3208C04B2235/3213C04B2235/3215C04B2235/3281C04B2235/442C04B2235/96
Inventor 雷文宋小强吕文中汪小红王晓川范桂芬付明
Owner HUAZHONG UNIV OF SCI & TECH