Composite microwave ceramic materials with dielectric adjustable and method for preparing same

Abstract

The invention belongs to the technical field of electronic materials and devices, and discloses a dielectric adjustable compound microwave ceramic material and a preparation method thereof. The compound microwave ceramic material is prepared by compounding AMP2O7 with BTO. The components of the compound microwave ceramic material and the percentage compositions of the components by weight are as follows based on the total weight of the compound microwave ceramic material: 50.0 to 97.5 percent of BaTiO3; and 2.5 to 50.0 percent of AMP2O7, in which A is Ca or Sr, and M is Zn or Cu. The traditional electronic ceramic preparation process adopted is simple; the cost is low; the material system is environment-friendly without toxicity or side effect; the compound microwave ceramic material has remarkable performance, and is applicable for development and design of adjustable microwave devices.

Description

Composite microwave ceramic material with adjustable dielectric and preparation method thereof technical field The invention belongs to the technical field of electronic materials and devices, and in particular relates to microwave ceramic materials and their preparation. Background technique Barium titanate (BaTiO3, denoted as BTO) is a ferroelectric material with a typical perovskite structure (ABO3), which has excellent dielectric nonlinearity, that is, the nonlinear characteristic that the dielectric constant changes with the applied electric field. The tuning characteristic can be applied in the microwave phase shifter. The equivalent dielectric constant of the circuit is changed by an external electric field, and then the wave velocity and wavelength of the electromagnetic wave are controlled to achieve the change of the phase shift. And because of its high dielectric constant, the size of components can be greatly reduced, which conforms to the trend of miniaturizat...

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Problems solved by technology

However, the sintering temperature of materials modified by these methods is generally around 1400°C, which cannot overcome the defect of high sintering temperature, and the dielectric tunability will deteriorate rapidly due to the introduction of the second phase.

These limit its application in ferroelectric phase shifters

According to literature search, the current improvement of barium titanate materials is mainly to improve the comprehensive dielectric properties of barium titanate materials by ion substitution, doping modification or composite low-loss microwave dielectric materials in barium titanate materials. Its adaptability in device applications, did not find any report on the dielectric tunability of low-fever microwave materials and barium titanate composites

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