Microwave dielectric ceramic material with adjustable dielectric constant and preparation method thereof

Microwave dielectric ceramic materials with adjustable dielectric constants were prepared by using the compositional expression xMg2SiO4-(1-x)Mg2TiO4-0.09CaTiO3-0.005MO. This solved the problem of uncontrollable frequency temperature coefficients and achieved the adjustment of dielectric constants in the range of 10 to 20 and the stability of frequency temperature coefficients, making them suitable for various antennas and filters.

CN118724562BActive Publication Date: 2026-07-03ZHEJIANG JIAKANG ELECTRONICS CO LTD
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Patent Information

Application Number
CN202410711492.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-06-04
Publication Date
2026-07-03
Estimated Expiration
2044-06-04

AI Technical Summary

Technical Problem

The frequency temperature coefficient of existing microwave dielectric materials with tunable dielectric constants is uncontrollable, which limits their application scenarios, especially in situations where a near-zero frequency temperature coefficient is required near different dielectric constants.

Method used

Using the compositional expression xMg2SiO4-(1-x)Mg2TiO4-0.09CaTiO3-0.005MO, microwave dielectric ceramic materials with adjustable dielectric constants were prepared through secondary batching of pre-synthesized powder I and pre-synthesized powder II, ensuring that the frequency temperature coefficient τf ≤ ±10ppm/℃.

Benefits of technology

It achieves an adjustable dielectric constant in the range of 10 to 20, a Q×f value of 47704 to 68149 GHz, and a stable frequency temperature coefficient of ±10 ppm/℃. It is suitable for applications such as multilayer patch antennas, baseband antennas, navigation antennas, and dielectric waveguide filters.

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Abstract

This invention discloses a microwave dielectric ceramic material with tunable dielectric constant and its preparation method, belonging to the field of microwave dielectric materials technology. The composition of this microwave dielectric ceramic material is expressed as: x Mg2SiO4-(1-x)Mg2TiO4-0.09CaTiO3-0.005MO, where: 0.15≤x≤0.7, and MO is an additive. The material is designed as a three-phase composite, composed of two types of dielectric constants, Mg2SiO4 and Mg2TiO4, with similar but negative frequency temperature coefficients, and one type of material with a positive frequency temperature coefficient, CaTiO3. This invention's microwave dielectric ceramic material can achieve arbitrary tunability of the dielectric constant within the range of 10.0~19.9 by simply changing the x value, with a Q×f value of 47704~68149GHz and a frequency temperature coefficient τ. f ≤±10ppm / ℃.
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