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Mesomeric electric constant laminated microwave dielectric ceramic and producing method thereof

A technology of microwave dielectric ceramics and dielectric constant, applied in ceramics, circuits, electrical components, etc., can solve the problems of low Qf value, small quantity, complex composition, etc.

Inactive Publication Date: 2006-10-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] On the other hand, although there are currently 0.42 (La 1 / 2 Na 1 / 2 ) TiO 3 -0.58Ca(Fe 1 / 2 Nb 1 / 2 )O 3 , Pb 0.4 Ca 0.6 [(Mg 1 / 3 Nb 2 / 3 ) 0.99 sn 0.01 ]O 3 High-end medium-permittivity microwave dielectric ceramics with equal permittivity between 42-80 and resonant frequency temperature coefficient between ±10ppm / °C are prepared by mixing the two materials, but the existing permittivity is 42 -80 microwave dielectric ceramics have disadvantages such as generally low Qf value (usually lower than 10,000GHz) and complex composition.
At the same time, the number of such materials is known to be small, and it is difficult to achieve serialization in practical applications

Method used

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Effect test

Embodiment 1

[0012] Invented intermediate permittivity laminated microwave dielectric ceramics are made of cylindrical Ba 2 Ti 9 o 20 and a cylindrical Ba of the same diameter 1.85 SM 4.1 Ti 9 o 26 It is formed by bonding insulating glue with a dielectric loss of 0.02, and the thickness of the insulating glue is 0.02mm. and replace it with (1-x)Ba 2 Ti 9 o 20 / xBa 1.85 SM 4.1 Ti 9 o 26 express. The microwave dielectric properties of the two terminal materials are: Ba 2 Ti 9 o 20 :ε r，eff = 41.0, Qf = 46,800GHz, τ f =2.0ppm / °C; Ba 1.85 SM 4.1 Ti 9 o 26 :ε r，eff = 76.1, Qf = 12,800GHz, τ f = 0.8 ppm / °C.

[0013] Table 1 for (1-x)Ba 2 Ti 9 o 20 / xBa 1.85 SM 4.1 Ti 9 o 26 Microwave dielectric properties of laminated ceramics.

[0014] Ba 1.85 SM 4.1 Ti 9 o 26

[0015] Known from Table 1, Ba 1.85 SM 4.1 Ti 9 o 26 When the volume percentage content is in the range of 0.2-0.80, the dielectric constant of laminated ceramics is between 42 and 80...

Embodiment 2

[0020] The invented medium dielectric constant laminated microwave dielectric ceramic is made of cylindrical Ba(Zn 1 / 2 Ta 2 / 3 )O 3 and a cylindrical Ba(Nd of the same diameter 0.9 Bi 0.1 ) 2 Ti 4 o 12 It is formed by bonding insulating glue with a dielectric loss of 0.02, and the thickness of the insulating glue is 0.02mm. and use (1-x)Ba(Zn 1 / 2 Ta 2 / 3 )O 3 / xBa(Nd 0.9 Bi 0.1 ) 2 Ti 4 o 12 express. The microwave dielectric properties of the two terminal materials are: Ba(Zn 1 / 2 Ta 2 / 3 )O 3 :ε r，eff = 30, Qf = 100,000GHz, τ f =1ppm / ℃; Ba(Nd 0.9 Bi 0.1 ) 2 Ti 4 o 12 :ε r，eff =90, Qf=6,000GHz, τ f = 3 ppm / °C.

[0021] Table 3 is (1-x)Ba(Zn 1 / 2 Ta 2 / 3 )O 3 / xBa(Nd 0.9 Bi 0.1 ) 2 Ti 4 o 12 Microwave dielectric properties of laminated ceramics.

[0022] Ba(Nd 0.9 Bi 0.1 ) 2 Ti 4 o 12

[0023] Known from Table 3, Ba(Nd 0.9 Bi 0.1 ) 2 Ti 4 o 12 When the volume percentage content is in the range of 0.2-0.80, the dielectric co...

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Abstract

The present invention discloses an intermediate dielectric constant laminated microwave medium ceramic. It is a double-layer composite microwave medium ceramic formed from microwave medium ceramic A whose dielectric constant is 30-45 and microwave medium ceramic B whose dielectric constant is 75-90. Its general formula is (1-x) A / xB, in which x is volume percentage, x is greater than or equal to 0.2 and is less than or equal to 0.75. Besides, said invention also provides it preparation method and concrete steps.

Description

technical field [0001] The invention relates to microwave dielectric ceramics used in microwave components such as dielectric resonators, filters and oscillators in communication systems and a preparation method thereof, in particular to a medium dielectric constant laminated microwave dielectric ceramic and a preparation method thereof. Background technique [0002] Medium dielectric constant microwave dielectric ceramics are widely used in microwave communication base stations, and their basic performance requirements are: dielectric constant ε = 30-80, resonant frequency temperature coefficient τ f =0±10ppm / °C, the Qf value should be as high as possible. In recent years, the trend of device miniaturization has attracted more and more attention to high-end medium-permittivity microwave dielectric ceramics (dielectric constant 42-80). [0003] On the other hand, although there are currently 0.42 (La 1 / 2 Na 1 / 2 )TiO 3 -0.58Ca(Fe 1 / 2 Nb 1 / 2 )O 3 , Pb 0.4 Ca 0.6 [(Mg ...

Claims

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Application Information

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IPC IPC(8): H01B3/12C04B35/468H01P7/10
Inventor 李雷陈湘明
Owner ZHEJIANG UNIV
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