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High dielectric constant low loss microwave dielectric ceramics

A microwave dielectric ceramic, high dielectric constant technology, applied in ceramics, inorganic insulators, etc., can solve the problems of low dielectric constant, accurate control of unfavorable components, PbO volatilization, etc., and achieve the effect of low loss and large industrial application value.

Inactive Publication Date: 2005-08-03
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such as Ba 6-3x ln 8+2x Ti 18 o 54 The Qf value of ceramics is high, but the dielectric constant is low (~80). If the dielectric constant is further increased, the Qf value will be significantly reduced; while the Pb-based perovskite can reach more than 100, and the Qf The value is relatively high, but the prominent problem is the volatilization of PbO. On the one hand, it is not conducive to the accurate control of the composition. On the other hand, it does not adapt to the development trend of environmental protection of microwave dielectric ceramics.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] When the composition is calcium oxide CaO: 25%, titanium dioxide TiO 2 : 50%, neodymium oxide - lanthanum oxide - samarium oxide Nd 2 o 3 -La 2 o 3 -Sm 2 o 3 : 25%, its microwave dielectric properties: dielectric constant 100-125, Qf value 5000-8500GHz.

Embodiment 2

[0015] When the composition is calcium oxide CaO: 25%, titanium dioxide TiO 2 : 65%, neodymium oxide - lanthanum oxide - samarium oxide Nd 2 o 3 -La 2 o 3 -Sm 2 o 3 : 10%, its microwave dielectric properties: dielectric constant 100-105, Qf value 6000-10000GHz.

Embodiment 3

[0017] When the composition is calcium oxide CaO: 33%, titanium dioxide TiO 2 : 53%, neodymium oxide-lanthanum oxide-samarium oxide Nd 2 o 3 -La 2 o 3 -Sm 2 o 3 : 14%, its microwave dielectric properties: the dielectric constant is 110, and the Qf value is 12000-17000GHz.

[0018] The "high dielectric constant and low loss microwave dielectric ceramic" disclosed by the present invention is used as a key core material of electronic components such as resonators, oscillators, filters and capacitors for microwave mobile communications.

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Abstract

The present invention relates to a kind of microwave dielectric ceramic with high dielectric constant, low loss and environment protecting performance. The microwave dielectric ceramic has expression of xCaO-y(mNd2O3-nLa2O3-pSm2O3)-zTiO2, with the molar contents: x of 25-55 %, y of 5-30 %, z of 45-65 %, x+y+z=100 %, and m+n+p=1. The microwave dielectric ceramic has very high dielectric constant up to 100-175, low loss, and resonant frequency temperature coefficient capable of being regulated from negative to positive, and may be used in movable microwave communication and other electronic industry widely.

Description

Technical field: [0001] The invention relates to a microwave dielectric ceramic with high dielectric constant and low loss. Background technique: [0002] Microwave dielectric ceramics are low-loss, temperature-stable electronic information materials suitable for microwave frequencies, and are widely used in components such as microwave resonators, filters, oscillators, phase shifters, microwave capacitors, and microwave substrates; , satellite communications, global satellite positioning system (GPS), Bluetooth technology and wireless local area network (WLA) and other key materials for modern communications. Components such as resonators and filters made of microwave dielectric ceramics largely determine the performance, size and cost of microwave communication final products. [0003] At present, the communication industry is developing in the direction of miniaturization and high integration. The miniaturization of mobile communication depends to a large extent on the ...

Claims

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Application Information

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IPC IPC(8): C04B35/057C04B35/46H01B3/12
Inventor 郑兴华
Owner FUZHOU UNIV