CN113651600A - Germanate microwave dielectric ceramic with low dielectric constant and high quality factor and preparation method thereof - Google Patents

Abstract

The invention discloses a dielectric constant epsilon_rBetween 8.9 and 9.9, the product of quality factor and resonant frequency (Qxf) is between 54,158 and 67,642GHz, and the temperature coefficient of resonant frequency (tau)_f) A novel germanate microwave dielectric ceramic with low dielectric constant and high quality factor at minus 58.3 to minus 47.9 ppm/DEG C and a preparation method thereof, which belong to the technical field of microwave dielectric ceramic preparation, and the chemical composition of the germanate microwave dielectric ceramic is Ca₃MgAGe₃O₁₂(A ═ Zr, Sn, Hf). The novel germanate microwave dielectric ceramic with low dielectric constant and high quality factor disclosed by the invention has simple chemical composition and preparation process, and can be applied to the manufacture of microwave devices such as dielectric resonators, microwave integrated circuit substrates and the like.

Description

Germanate microwave dielectric ceramic with low dielectric constant and high quality factor and preparation method thereof

Technical Field

The invention relates to a dielectric ceramic material of microwave components such as a dielectric substrate, a resonator, a waveguide loop and the like used at microwave frequency and a preparation method thereof.

Background

With the rapid development of modern communications such as 5G communications technology, communications network technology and satellite communications, the demands for miniaturization, low loss, low cost and high stability of modern communications technology materials are further increased. The microwave dielectric ceramic is used as a core component of modern communication technology, and is widely applied to mobile communication, satellite communication, global satellite positioning system and Bluetooth equipment as microwave electronic components such as a dielectric resonator/filter, a dielectric antenna, a dielectric guided wave loop and the like due to excellent dielectric constant, high quality factor and low resonant frequency temperature coefficientAnd in microwave communication systems such as wireless local area networks. The microwave dielectric ceramic with low relative dielectric constant, high quality factor and near-zero temperature coefficient of resonance frequency has become one of the research hotspots in recent years due to its fast signal propagation speed, low loss and excellent frequency-selecting characteristic, and the design and development of a novel microwave dielectric ceramic material with excellent microwave dielectric property is the core of the rapid development of modern 5G communication technology. Having M₃A₂Ge₃O₁₂Germanates of the general formula have excellent microwave dielectric properties, such as Mg with ordered A-position₃Y₂Ge₃O₁₂、Ca₃A₂Ge₃O₁₂(A ═ Al, Ga) and Ca with disorder of A position₃AGe₃O₁₂(A ═ ZnZr, CoZr, CaZr) and the like, and some compositions have a low dielectric constant (. epsilon.) (_r10) and high quality factor (Qxf 100,000GHz), but a temperature coefficient of resonance frequency tau_fUp to-55 ppm/DEG C; some have very low quality factor and large temperature coefficient of resonance frequency, such as Mg₃Y₂Ge₃O₁₂Has a Q x f of only 12,600GHz, a temperature coefficient of resonance frequency tau_fUp to-120 ppm/DEG C. More germanate microwave dielectric ceramic materials with excellent microwave dielectric property are designed and developed, so that wider selectivity can be realized for the application of microwave frequency band electronic components.

Disclosure of Invention

The invention aims to provide a novel germanate microwave dielectric ceramic material with low dielectric constant and high quality factor and a preparation method thereof.

The chemical composition of the novel germanate material with low dielectric constant and high quality factor related by the invention is as follows: ca₃MgAGe₃O₁₂(A＝Zr,Sn,Hf)。

The germanate microwave dielectric ceramic with the low dielectric constant and the high quality factor is prepared by the following steps:

(1) mixing CaCO₃(99％)，MgC₂O₄·2H₂O(99％)，ZrO₂(99.99％)，SnO₂(99.5％)，HfO₂(99.9％)，GeO₂(99.99%) dried powder as Ca₃MgAGe₃O₁₂Weighing ingredients according to a chemical formula (A ═ Zr, Sn and Hf);

(2) mixing the raw materials in the step (1), wet-type hand-grinding for 1-2 hours, drying the raw materials by using absolute ethyl alcohol, and presintering the raw materials for 8 hours at 1280 ℃ in an atmosphere;

(3) compacting the powder obtained in step (2) to obtain Ca₃MgZrGe₃O₁₂Sintering at 1330 deg.C for 8 hr₃MgSnGe₃O₁₂And Ca₃MgHfGe₃O₁₂Sintering at 1360 deg.C for 8 hr.

The microwave dielectric ceramic Ca with low dielectric constant prepared by the invention₃MgAGe₃O₁₂(A ═ Zr, Sn, Hf), simple in preparation process, and low in dielectric constant (8.9. ltoreq. epsilon.)_r9.9) and high quality factor (54,158GHz Q f 67,642 GHz), and a temperature coefficient of resonance frequency of-58.3 ppm/DEG C tau_fLess than or equal to-47.9 ppm/DEG C, and can meet the application requirements of low-dielectric-constant type dielectric substrate communication electronic components.

Drawings

FIG. 1 is an X-ray diffraction pattern of an example of the present invention

Detailed Description

Table 1 shows specific examples of the present invention and their microwave dielectric properties. The preparation method is as described above, phase analysis is performed on the sintered ceramic sample by the powder X-ray diffraction method, and fig. 1 is an X-ray diffraction pattern of the specific example, showing that a single phase is formed. The dielectric properties of the microwaves were evaluated by the cylindrical dielectric resonator method.

The invention can be widely used for manufacturing microwave devices such as various dielectric substrates, resonators/filters and the like, and can meet the technical requirements of dielectric substrate systems such as mobile communication, satellite communication, global satellite positioning systems and the like.

Table 1:

Claims (2)

1. the inventionDiscloses a class of dielectric constants_rBetween 8.9 and 9.9, the product of quality factor and resonant frequency (Qxf) is between 54,158 and 67,642GHz, and the temperature coefficient of resonant frequency (tau)_f) A novel germanate microwave dielectric ceramic with low dielectric constant and high quality factor at minus 58.3 to minus 47.9 ppm/DEG C and a preparation method thereof, which belong to the technical field of microwave dielectric ceramic preparation, and the chemical composition of the germanate microwave dielectric ceramic is Ca₃MgAGe₃O₁₂(A＝Zr,Sn,Hf)。

2. The microwave dielectric ceramic of claim 1 prepared by the steps of:

(1) mixing CaCO₃(99％)，MgC₂O₄·2H₂O(99％)，ZrO₂(99.99％)，SnO₂(99.5％)，HfO₂(99.9％),GeO₂(99.99%) dried powder as Ca₃MgAGe₃O₁₂Weighing ingredients according to a chemical formula (A ═ Zr, Sn and Hf);

(2) mixing the raw materials in the step (1), wet-type hand-grinding for 1-2 hours, drying the raw materials by using absolute ethyl alcohol, and presintering the raw materials for 8 hours at 1280 ℃ in an atmosphere;

(3) compacting the powder obtained in step (2) to obtain Ca₃MgZrGe₃O₁₂Sintering at 1330 deg.C for 8 hr₃MgSnGe₃O₁₂And Ca₃MgHfGe₃O₁₂Sintering at 1360 deg.C for 8 hr.

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