Low-dielectric microwave dielectric ceramic material and temperature-frequency characteristic regulation and control method thereof

Abstract

The invention belongs to the technical field of microwave dielectric ceramics, and discloses a low-dielectric microwave dielectric ceramic material and a temperature-frequency characteristic regulation and control method thereof. The chemical general formula of a main crystalline phase of the low-dielectric microwave dielectric ceramic material is CaO-SnO2-xSiO2-yGeO2, x is larger than or equal to0 and smaller than or equal to 1.0, y is larger than or equal to 0 and smaller than or equal to 1.0, and the main crystalline phase is a maleite phase; the microwave dielectric ceramic material is alow-dielectric microwave dielectric ceramic material, and the relative dielectric constant epsilon r is 10.37-11.7. By regulating the molar ratio 1:1:x:y of Ca:Sn:Si:Ge, the microwave dielectric ceramic material can be obtained correspondingly, l with a relative dielectric constant as low as 10.37-11.7 and the self-adjustable resonant frequency temperature coefficient tau f is acquired under the condition of avoiding the use of Ti element, thereby effectively widening the selection range of the low-dielectric-constant microwave dielectric ceramic material. Moreover, the resonance frequency temperature coefficient tau f of the microwave dielectric ceramic material can be regulated and controlled by regulating and controlling the ratio of SiO2 to GeO2 and utilizing ion substitution.

Description

technical field [0001] The invention belongs to the technical field of microwave dielectric ceramics, and more specifically relates to a low-dielectric microwave dielectric ceramic material and a method for regulating its temperature-frequency characteristics. Background technique [0002] Microwave dielectric ceramics refer to ceramic materials used as dielectrics in microwave frequency band (300MHz-300GHz) circuits. With the advent of the 5G era and the continuous increase in the operating frequency of communication equipment, the signal delay phenomenon will become more obvious, the system loss and heat generation will also increase, and the system stability will gradually deteriorate. The low dielectric constant can reduce the interaction coupling loss between the material and the electrode, and can increase the transmission rate of the electrical signal. The high quality factor can effectively improve the frequency selection characteristics and reduce the loss. The near...

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Problems solved by technology

[0003] For microwave dielectric ceramics with low dielectric constant, the polarization form is mainly ion displacement polarization. When the temperature rises, the ionic bonds gradually elongate, the polarization distance gradually increases, and the ionic polarization gradually increases. The constant tends to increase gradually with the increase of temperature, so for most low-permittivity microwave dielectric ceramics, the temperature coefficient of resonance frequency is often negative, and the adjustment of the negative temperature coefficient of resonance frequency often takes the method of adding a positive resonance frequency The temperature coefficient of Ti-based (TiO 2 , CaTiO 3 , SrTiO 3 ) materials, but the addition of Ti-based materials often results in an increase in the dielectric constant and a decrease in the quality factor, and the price of Ti-based materials is variable at high temperatures.

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