CN1405118A - Low-consumption microwave medium ceramic - Google Patents
Low-consumption microwave medium ceramic Download PDFInfo
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- CN1405118A CN1405118A CN 02145170 CN02145170A CN1405118A CN 1405118 A CN1405118 A CN 1405118A CN 02145170 CN02145170 CN 02145170 CN 02145170 A CN02145170 A CN 02145170A CN 1405118 A CN1405118 A CN 1405118A
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Abstract
The invention relates to a microwave medium ceramics used in the medium resonator, filter and oscillator in microwave communication system. Its expression formula is xMeO.yRe2O3,2 Al2O3, in which Me=Ca or Sr, Re=Sm or Y, and the contents of all components are respectively as follows: x is greater than or equal to 45.0 mole% or less than or equal to 55.0 mole%, y is greater than or equal to 20.0 mole% or less than or equal to 30.0 mole%, z is greater than or equal to 20.0 mole% or less than or equal to 30.0 mole%, and x+y+z=100%. It has low loss and resonance frequency temperalure coefficient close to zero, at the same time its dielectric constant is 18-22.
Description
Technical field
The present invention relates to be used for the microwave-medium ceramics of microwave communication systems such as dielectric resonator, wave filter and vibrator.
Background technology
In recent years, along with developing rapidly of mobile communication and satellite communication technology, the demand of the microwave-medium ceramics that microwave devices such as dielectric resonator and wave filter are used is just growing.Developing rapidly of data mobile communication and satellite communication proposes urgent requirement to ceramics as low-loss microwave medium.Its Essential Performance Requirements is: DIELECTRIC CONSTANT=18～22, quality factor q f＞60,000GHz, temperature coefficient of resonance frequency τ
f=0 ± 10ppm/ ℃.On the other hand, though existing at present Ba (Mg
1/3Ta
2/3) O
3, CaTiO
3-MgTiO
3Deng ceramics as low-loss microwave medium, but the former sintering temperature height, preparation difficulty, quality factor and temperature factor are with the preparation condition variation greatly, and there is Qf value shortcoming on the low side in the latter.
Summary of the invention
The ceramics as low-loss microwave medium that the purpose of this invention is to provide a kind of specific inductivity and be 18～22, has low-loss and good temperature stability simultaneously.
The general expression formula of ceramics as low-loss microwave medium of the present invention is xMeO.yRe
2O
3.zAl
2O
3, wherein, Me=Ca or Sr, Re=Sm or Y, the content of each composition is respectively: 45.0 moles of %≤x≤55.0 mole %, 20.0 moles of %≤y≤30.0 mole %, 20.0 moles of %≤z≤30.0 mole %, x+y+z=100%.
The invention provides and have low-loss and near-zero resonance frequency temperature coefficient, specific inductivity is 18～22 ceramics as low-loss microwave medium simultaneously.And utilize ceramics as low-loss microwave medium provided by the invention, can make microwave devices such as dielectric resonator and wave filter be fit to higher frequency and more powerful application.Simultaneously, pottery provided by the invention also can be applicable to radio ceramics electrical condenser, temperature compensating ceramic capacit or microwave base plate etc.Therefore, the present invention has great value industrial.
Embodiment
Further specify the present invention below in conjunction with example.
The ceramics as low-loss microwave medium of invention can be prepared from as follows.
At first, with purity be CaCO more than 99.9%
3, SrCO
3, Sm
2O
3, Y
2O
3And Al
2O
3Mix 24 hours (solvent is a distilled water) with the wet ball-milling method according to a certain percentage, the oven dry back is given in 1150～1250 ℃, air atmosphere and being burnt 3 hours.Then, in giving the burning powder, after interpolation binding agent and the granulation, be formed in 1000kg/cm by uniaxial tension
2Pressure under prepare the ceramic body of diameter 12mm, thickness 3～6mm, at last in 1400～1450 ℃, air atmosphere sintering 3 hours to prepare required microwave-medium ceramics.
Carried out material phase analysis with the ceramic sample of powder method of X-ray diffraction after, and carried out the evaluation of microwave dielectric property with the cylindrical dielectric resonator method at 10GHz sintering.
Table 1 shows and constitutes each component content of the present invention and microwave dielectric property relation.
As known from Table 1, in ceramic systems of the present invention, along with MeO (Me=Ca or Sr) and Re
2O
3The increase and the Al of (Re=Sm or Y) content
2O
3The minimizing of content, DIELECTRIC CONSTANT are tending towards increasing.And at Re
2O
3Content=Al
2O
3During content; Qf value (Q is that quality factor are the inverse of dielectric loss, and f is a resonant frequency) is got maximum value, while temperature coefficient of resonance frequency τ
fGet minimum value, along with composition departs from this value, the Qf value is tending towards reducing, τ
fValue is tending towards increasing.As x＜45.0mol% or x＞55.0mol%, when y＜20.0mol% or y＞30.0mol%, z＜20.0mol% or z＞30.0mol%, the Qf value will be less than 60000GHz, and temperature coefficient of resonance frequency is with (τ bigger than normal
f＜-10ppm/ ℃ or τ
f＞+10ppm/ ℃).Therefore, composition range of the present invention is decided to be 45.0mol%≤x≤55.0mol%, 20.0mol%≤y≤30.0mol%, 20.0mol%≤z≤30.0mol%.
In all the components of present embodiment, SrO=50mol%, Sm
2O
3=25mol%, Al
2O
3The one-tenth branch of=25mol% has best microwave dielectric property: ε=19, Qf=120,000GHz, τ
f=-5ppm/ ℃.Table 1
| CaO content, x (mol%) | SrO content, x (mol%) | ?Sm 2O 3Content, y (mol%) | ?Y 2O 3Content, y (mol%) | ?Al 2O 3Content, z (mol%) | ?ε | ?Qf ?(GHz) | τ f(ppm/℃) |
| 0 | ?45 | ?30 | ?0 | ?25 | ?20 | ?65000 | -9 |
| 0 | ?50 | ?25 | ?0 | ?25 | ?19 | ?120000 | -5 |
| 0 | ?50 | ?20 | ?0 | ?30 | ?17 | ?80000 | -8 |
| 0 | ?50 | ?30 | ?0 | ?20 | ?19 | ?70000 | -8 |
| 0 | ?55 | ?20 | ?0 | ?25 | ?21 | ?60000 | -10 |
| 0 | ?45 | ?0 | ?30 | ?25 | ?22 | ?80500 | +9 |
| 0 | ?50 | ?0 | ?25 | ?25 | ?19 | ?98000 | +7 |
| 0 | ?55 | ?0 | ?20 | ?25 | ?18 | ?76000 | +10 |
| 50 | ?0 | ?0 | ?25 | ?25 | ?19 | ?106000 | +7 |
| 50 | ?0 | ?25 | ?0 | ?25 | ?19 | ?110000 | -6 |
Claims (1)
1. ceramics as low-loss microwave medium, the expression formula that it is characterized in that it is xMeO.yRe
2O
3.zAl
2O
3, wherein, Me=Ca or Sr, Re=Sm or Y, the content of each composition is respectively:
45.0 mole %≤x≤55.0 mole %, 20.0 moles of %≤y≤30.0 mole %,
20.0 mole %≤z≤30.0 mole %, x+y+z=100%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021451702A CN1190389C (en) | 2002-11-08 | 2002-11-08 | Low-consumption microwave medium ceramic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021451702A CN1190389C (en) | 2002-11-08 | 2002-11-08 | Low-consumption microwave medium ceramic |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1405118A true CN1405118A (en) | 2003-03-26 |
| CN1190389C CN1190389C (en) | 2005-02-23 |
Family
ID=4750793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021451702A Expired - Fee Related CN1190389C (en) | 2002-11-08 | 2002-11-08 | Low-consumption microwave medium ceramic |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1190389C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102584235A (en) * | 2012-02-24 | 2012-07-18 | 浙江大学 | Low-consumption microwave medium ceramic |
| CN101691299B (en) * | 2009-09-30 | 2012-11-28 | 浙江大学 | High-frequency high-dielectric-constant ceramics |
| CN109608187A (en) * | 2018-12-20 | 2019-04-12 | 无锡鑫圣慧龙纳米陶瓷技术有限公司 | A kind of K2NiF4The low-loss temperature-stabilized microwave-medium ceramics and preparation method of structure |
-
2002
- 2002-11-08 CN CNB021451702A patent/CN1190389C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101691299B (en) * | 2009-09-30 | 2012-11-28 | 浙江大学 | High-frequency high-dielectric-constant ceramics |
| CN102584235A (en) * | 2012-02-24 | 2012-07-18 | 浙江大学 | Low-consumption microwave medium ceramic |
| CN109608187A (en) * | 2018-12-20 | 2019-04-12 | 无锡鑫圣慧龙纳米陶瓷技术有限公司 | A kind of K2NiF4The low-loss temperature-stabilized microwave-medium ceramics and preparation method of structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1190389C (en) | 2005-02-23 |
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