Production method of high-dielectric low-loss high-frequency microwave composite dielectric substrate

Abstract

The invention discloses a preparation method of a high-dielectric low-loss high-frequency microwave composite dielectric substrate, and belongs to the field of microwave electronic component ceramic materials, wherein the preparation method comprises the following steps: preparing CaTiO3 and Li0.5Sm0.5TiO3 according to a molar ratio to form CLST ceramic powder; ball-milling the ceramic powder; sintering at high temperature; carrying out surface treatment on the ceramic powder by using a silane coupling agent; proportioning the ceramic powder subjected to surface treatment and polytetrafluoroethylene emulsion; adding a demulsifier for demulsification; standing and filtering to form composite dough; carrying out calendering molding or compression molding; and carrying out hot pressed sintering on a molded green body coated with copper foils on two surfaces to form the high-dielectric low-loss high-frequency microwave composite dielectric substrate. The problems that an existing microwave dielectric ceramic material is low in dielectric constant, large in loss, large in temperature coefficient of resonance frequency and free of continuous batch production capacity are solved. The substrate is widely applied to the modern microwave electronic communication fields of spaceflight electronic equipment circuit boards, satellite communication, Beidou systems and the like.

Description

technical field [0001] The invention belongs to the field of electronic components, specifically, to the field of microwave electronic components, and more specifically, to the field of ceramic materials for microwave electronic components. Background technique [0002] Microwave dielectric ceramics (MWDC) refer to ceramic materials that are used as dielectric materials in microwave frequency (300MHz-300GHz) circuits and perform one or more functions. In microwave electronic components, microwave dielectric ceramics are the key materials for making microwave resonators and filters. frequency, with a near-zero resonant frequency temperature coefficient to ensure the stability of the device. At present, although the widely used microwave dielectric ceramic materials meet the requirements of some electronic components in terms of performance, with the deepening of research on satellite applications, deep space exploration and manned spaceflight, high-capacity, high-frequency a...

AI Technical Summary

Problems solved by technology

Solve the problems of existing microwave dielectric ceramic materials such as low dielectric constant, large loss, large temperature coefficient of resonant frequency, and lack of continuous batch production capacity

[0005] The technical concept adopted in the present invention is: by preparing high-dielectric microwave porcelain powder as filler, no longer using low-dielectric glass fiber cloth, and adopting pure ceramics to fill PTFE, it is difficult to prepare high-dielectric and low-loss materials in traditional production processes. High-frequency microwave composite dielectric substrate

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