Multilayer Inductor Structure for Crosstalk Suppression
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Solution Overview
Problem
Inductors with closely packed internal conductors experience magnetic coupling (crosstalk) and reduced inductance, while increasing the conductor spacing reduces inductance further, and there is a need for improved DC current characteristics.
Innovation Solution
An inductor design with first and second wires separated by an interval, using magnetic layers with higher relative permeability and suppression portions, such as slits, to minimize crosstalk and maintain inductance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If internal conductors are closely packed to achieve miniaturization and increased inductance, then inductance is improved, but magnetic coupling (crosstalk) between adjacent conductors increases
Solution Approach 1:
The magnetic layer is segmented into multiple regions with different relative permeabilities. The first magnetic layer has a first relative permeability, while the second and third magnetic layers have second relative permeabilities that are higher than the first. This segmentation allows the inductor to maintain compact size while using high-permeability regions to confine magnetic flux and reduce crosstalk between closely packed conductors.
Solution Approach 2:
Different regions of the magnetic layer are assigned different magnetic properties (relative permeability values). The second and third magnetic layers positioned adjacent to conductors have higher relative permeability to locally enhance magnetic coupling with individual conductors, while the first magnetic layer has lower relative permeability to reduce overall crosstalk. This local differentiation of magnetic properties resolves the contradiction between compactness and crosstalk suppression.
2Object-generated harmful factors
If the interval between adjacent internal conductors is lengthened to suppress crosstalk, then magnetic coupling is reduced, but inductance decreases
Solution Approach 1:
The relative permeability parameter of magnetic layers is changed to resolve the contradiction. By introducing magnetic layers with different relative permeability values, the system can suppress crosstalk through low-permeability regions while maintaining high inductance through high-permeability regions adjacent to conductors, eliminating the need to increase conductor spacing.
3Reliability
If conventional magnetic layer structures are used, then manufacturing is simple, but superimposed DC current characteristics are insufficient
Solution Approach 1:
The magnetic layer is constructed as a composite structure with multiple sub-layers (first, second, and third magnetic layers) having different relative permeabilities. This composite magnetic layer structure improves superimposed DC current characteristics by providing differentiated magnetic pathways, while the layers can be manufactured using conventional techniques, balancing performance improvement with manufacturing feasibility.
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 inductor effectively suppresses crosstalk between wires while maintaining inductance, with improved DC current characteristics and a simplified structure.
Implementation Method 1
a first magnetic layer (4) having a first surface (11) continuing in a surface direction, a second surface (12) separated from the first surface (11) by an interval in a thickness direction and continuing in the surface direction, an inner peripheral surface (10) located between the first surface (11) and the second surface (12) and being in contact with an outer peripheral surface (17) of the first wire (2) and an outer peripheral surface (17) of the second wire (3)
Data Source
AI summary
An inductor includes a first wire adjacent to a second wire and separated by an interval; a first magnetic layer having first and second surfaces separated from each other by an interval, and an inner peripheral surface in contact with an outer peripheral surface of the first and second wires between the first and second surfaces; a second magnetic layer disposed on the first surface; and a third magnetic layer disposed on the second surface. The second magnetic layer has a third surface facing and separated from the first surface by an interval in the thickness direction. The relative permeability of each of the second and third magnetic layers is higher than that of the first magnetic layer. The inductor includes a suppression portion located between the first and second wires which suppresses the magnetic coupling between the first and second wires.