Multilayer Inductor Ferrite Composition for 1 GHz Noise Suppression
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Solution Overview
Problem
Existing multilayer inductor components fail to effectively eliminate noise in high-frequency bands above 1 GHz, as their impedance characteristics are limited, leading to inadequate noise suppression in modern electronic devices.
Innovation Solution
A multilayer inductor component is developed using a ferrite material composed of Fe2O3, NiO, CuO, and ZnO, with CoO as an additive, achieving an impedance peak of 500 Ω or greater at frequencies above 1 GHz, thereby shifting the series resonance frequency to higher frequencies and enhancing noise elimination capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ferrite materials are used in multilayer inductor components, then the component can operate at lower frequencies, but the impedance peak in high-frequency bands (1 GHz or higher) is insufficient for effective noise elimination
Solution Approach 1:
The patent applies parameter changes by precisely controlling the chemical composition parameters of the ferrite material. Specifically, it uses Fe2O3 (30-45 mol%), NiO (45-58 mol%), CuO (6-10 mol%), and ZnO (0-3 mol%) in specific proportions, with CoO additive (0.1-2.5 mass%). This compositional parameter optimization shifts the impedance peak to 1 GHz or higher while maintaining adequate impedance magnitude for noise elimination.
Solution Approach 2:
The patent employs composite materials by creating a multi-component ferrite system combining Fe2O3, NiO, CuO, ZnO, and CoO. This composite ferrite material achieves both high-frequency impedance characteristics and sufficient sintered density (5.00 g/cm³ or higher), resolving the contradiction between frequency adaptability and noise elimination effectiveness.
2Ease of manufacture
If the sintered density of the multilayer part is reduced, then the manufacturing process becomes easier, but the insulation resistance deteriorates
Solution Approach 1:
The patent resolves this contradiction through parameter changes in the ferrite composition, specifically optimizing the ratio of Fe2O3, NiO, CuO, and ZnO along with CoO additive. This composition enables the material to achieve adequate sintered density (5.00 g/cm³ or higher) while maintaining good sintering processability and insulation resistance, eliminating the need to trade off between manufacturing ease and reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The component effectively eliminates noise in high-frequency bands by achieving an impedance peak of 500 Ω or greater at 1 GHz or higher, ensuring improved noise suppression in electronic devices while maintaining sufficient sintered density to prevent insulation resistance deterioration.
Implementation Method 1
The magnetic layers are formed from a ferrite material and an additive. The ferrite material contains Fe2O3, NiO, CuO, and ZnO. Fe2O3 is 30 to 45 mol %. NiO is 45 to 58 mol %. CuO is 6 to 10 mol %. ZnO is 0 to 3 mol %. The additive contains CoO.
Implementation Method 2
The density (hereinafter referred to as sintered density) of the multilayer part obtained by sintering the ferrite material and additive can be 5.00 g/cm3 or higher.
Data Source
AI summary
A multilayer inductor component has a multilayer part having a plurality of magnetic layers laminated therein and a conductor part arranged within the multilayer part. The magnetic layers are formed from a ferrite material and an additive. The ferrite material contains Fe2O3, NiO, CuO, and ZnO. Fe2O3 is 30 to 45 mol %. NiO is 45 to 58 mol %. CuO is 6 to 10 mol %. ZnO is 0 to 3 mol %. The additive contains CoO. The content of CoO is 0.1 to 2.5 mass % with respect to the ferrite material as a whole. The multilayer inductor component has an impedance peak of 500 Ω or greater at an operating frequency of 1 GHz or higher.