Filter, manufacturing method thereof and electronic equipment

By controlling the molar ratio of Ni and Zn elements and the setting of the internal electrode, the co-firing matching of the filter material layer was optimized, solving the problem of structural defects after filter sintering and improving the performance and reliability of the filter.

CN122267462APending Publication Date: 2026-06-23SHENZHEN SUNLORD ELECTRONICS
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Patent Information

Application Number
CN202610273069.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-06
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

Due to poor co-firing compatibility between different material layers, structural defects such as cracking, deformation, and delamination occur after the filter is sintered, affecting its reliability and magnetic properties.

Method used

By controlling the molar ratio of Ni and Zn elements in the first magnetic ferrite layer, the first non-magnetic ferrite layer, and the second magnetic ferrite layer to satisfy a certain proportional relationship, the difference in the thermal expansion coefficient and sintering shrinkage rate of the materials is optimized, the co-firing matching is improved, and the position and material of the internal electrode are optimized.

Benefits of technology

The differential-mode cutoff frequency and common-mode signal suppression capability of the filter were improved, structural defects were reduced, the mechanical strength and reliability of the filter were enhanced, and the stability of magnetic properties and electromagnetic compatibility were ensured.

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Abstract

The invention relates to the technical field of filters, in particular to a filter, a manufacturing method thereof and electronic equipment. The filter includes a body and an inner electrode. The main body comprises a first magnetic ferrite layer, a first non-magnetic ferrite layer and a second magnetic ferrite layer which are stacked in sequence. The inner electrode is disposed within the first non-magnetic ferrite layer. Wherein the first magnetic ferrite layer, the second magnetic ferrite layer and the first non-magnetic ferrite layer are made of at least Ni element and Zn element. The molar ratio n (Ni): n (Zn) of the Ni element to the Zn element in the first non-magnetic ferrite layer is r1, the molar ratio n (Ni): n (Zn) of the Ni element to the Zn element in the first magnetic ferrite layer is r2, the molar ratio n (Ni): n (Zn) of the Ni element to the Zn element in the second magnetic ferrite layer is r3, r1 is smaller than r2, and r1 is smaller than r3, so that the filter has good cofiring matching performance, and the reliability of the filter is improved.
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