Environment friendly microwave medium ceramic substrate

Abstract

The invention relates to an environment friendly microwave medium ceramic substrate which is mainly used for the circuits of microwave and millimeter wave satellite communication products, military radar products, electronic navigation products, microwave safety monitoring products, and the like. The substrate is prepared by adopting the following steps of: directly mixing ceramic microcrystal powder with polytetrafluoroethylene (PTFE) powder, PTFE emulsion, glass fiber powder, liquid-state epoxy resin and PVA (Polyvinylalcohol) solution raw material and micro flame-retardant additive raw materials: brominated resin, antimony pentoxide (Sb2O5) and bismuth trioxide (Bi2O3); carrying out blooming, primary drying, laminating, finish rolling, two-surface or two-way continuous sizing, redrying, two-surface or two-way continuous copper foil coating, tailoring and high-pressure lamination; then vacuumizing and curing for 50-60min at low temperature of 170-200 DEG C. The invention does not contain Nb heavy metal components and has good properties of microwave high frequency band low dielectric Epsilonr, low loss tan delta, high signal transmission efficiency and high stability and the advantages of simple process and low sintering temperature and can be cofired with a silver electrode.

Description

technical field [0001] The invention relates to an environment-friendly microwave dielectric ceramic substrate, which is mainly used in microwave and millimeter wave satellite communication, military radar, electronic navigation, microwave safety monitoring and other product circuits. Background technique [0002] At present, with the surrender of some frequency bands of high-frequency communication for military purposes, high-frequency communication has developed rapidly, making modern communication, navigation, medical treatment, transportation, and radio and television transmission develop towards high frequency. For high-frequency high-quality signal transmitting and receiving equipment, microwave (300MHz-300GHz) dielectric ceramic substrate is the most dynamic and promising component in the field of advanced ceramic materials, and its demand is increasing sharply. The traditional paper substrate due to the sheet dielectric ε r High, large tanδ loss, resonant frequency ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: to overcome the above-mentioned shortcomings of microwave dielectric ceramics, to provide an environment-friendly microwave dielectric ceramic substrate, which does not contain Nb heavy metal components, and has good microwave high-frequency low dielectric ε r , low loss tanδ, efficient signal transmission, high stability, simple process, low sintering temperature, and can be co-fired with silver electrodes

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