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Microwave medium ceramic with low dielectric constant and low loss and preparation method thereof

A microwave dielectric ceramic, low dielectric constant technology, applied in ceramics, inorganic insulators and other directions, can solve the problems of low yield and production efficiency, complex mold making, unfavorable mass production, etc., to achieve convenient processing, stable process, convenient The effect of mass production and application promotion

Active Publication Date: 2014-12-03
JIANGSU JIANGJIA ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These requirements greatly limit the application of most ceramic materials in practical devices
Although a variety of low dielectric constant microwave dielectric ceramic materials have been developed, for a certain microwave dielectric ceramic material, when the resonant frequency tends to zero, its dielectric constant is generally a certain value. When the dielectric constant needs to be changed, it is often necessary to reselect the material series
Moreover, in general, the dielectric antenna and the dielectric substrate are required to have coupling holes. The traditional method of producing holes through a mold is not only complicated to make the mold, but also has low yield and production efficiency in the production process of the dielectric antenna and the dielectric substrate, which is not conducive to Mass production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] 1. Press Zn 1 O 0.5SiO 2 Prepare 80kg of main raw materials. Pre-fired at 1100°C for 3.5 hours, the general formula of synthesis is Zn 1 O 0.5SiO 2 The main component is made into powder;

[0013] 2. Put 20kg powdered TiO into the main component 2 , mixed to obtain a powdery mixture;

[0014] 3. Billet making and sintering; the powdery mixture is pressed into shape, kept at a temperature of 1200° C. for 3.5 hours, discharged, and cooled to obtain it.

Embodiment 2

[0016] 1. Press Li 2 O SiO 2 Prepare 80kg of main raw materials. Pre-fired at 1100°C for 4.5 hours, the general formula is Li 2 O SiO 2 The main component is made into powder;

[0017] 2. Put 11kg of powdered TiO into the main component 2 , mixed to obtain a powdery mixture;

[0018] 3. Billet making and sintering; the powder mixture is pressed into shape, kept at a temperature of 1280° C. for 4.5 hours, discharged, and cooled to obtain.

Embodiment 3

[0020] 1. Press (Zn 0.5 Li)O 0.8SiO 2 Prepare 80kg of main raw materials. Pre-fired at 1100°C for 4 hours, the synthetic formula is (Zn 0.5 Li)O 0.8SiO 2 The main component is made into powder;

[0021] 2. Put 11.9kg of powdered TiO into the main component 2 , mixed to obtain a powdery mixture;

[0022] 3. Billet making and sintering; the powder mixture is pressed into shape, kept at a temperature of 1250° C. for 4 hours, discharged, and cooled to obtain it.

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PUM

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Abstract

The invention discloses a microwave medium ceramic with a low dielectric constant and a low loss and a preparation method thereof and belongs to the technical field of a microwave medium ceramic material. The microwave medium ceramic has the characteristics of low dielectric constant, low loss, high temperature stability, continuously adjustable dielectric constant and high machining property. The composition of the microwave medium ceramic is expressed by a general formula: (Zn1-xLi2x)O.ySiO2+a weight percent of TiO2, wherein x is more than or equal to 0 and less than or equal to 1; y is more than or equal to 0.5 and less than or equal to 1; a is more than or equal to 0 and less than or equal to 20; and a is mass percentage in (Zn1-xLi2x)O.ySiO2. The microwave medium ceramic is prepared by the following steps of: 1) confecting zinc oxide, lithium carbonate and silicon dioxide according to the general formula (Zn1-xLi2x)O.ySiO2+a weight percent of TiO2, mixing and pre-burning the mixture to synthesize a main component and crushing the main component into powder; 2) putting powdery TiO2 into the main component and mixing to obtain a powdery mixture; and 3) blanking and sintering the powdery mixture. A specific tau f modifier TiO2 is selected, so the material has a dielectric constant of between 7 and 9, a high quality factor value of Q*f0 and adjustable frequency temperature coefficient tau f. Simultaneously, the material has the advantages of simple preparation process, no special requirement on equipment and workshop environment and contribution to batch production, application and popularization.

Description

technical field [0001] The invention belongs to the technical field of microwave dielectric ceramic materials, and in particular relates to ceramic materials used for microwave components such as dielectric antennas and dielectric substrates in communication systems and a preparation method thereof. Background technique [0002] In recent years, low dielectric constant microwave dielectric ceramic materials have been widely used in civil and military applications because they can be used to make dielectric antennas, dielectric substrates and other key components in microwave communication systems and microwave circuits. The requirements of these applications for low dielectric constant microwave dielectric ceramic materials are: (1) a certain dielectric constant (Er); (2) low loss (ie high quality factor or Q*f0 (GHz) value); (3 ) The resonant frequency temperature coefficient (τf) tends to zero, which is used to ensure that the device has good stability when the temperature...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B3/12C04B35/14C04B35/453C04B35/622
Inventor 严盛喜韦玉华赵明张益勇
Owner JIANGSU JIANGJIA ELECTRONICS
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