Multilayer Substrate With Ferrite Magnetic Body For Noise Reduction
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Solution Overview
Problem
Conventional substrates with high magnetic permeability struggle to achieve high inductance values, making it difficult to effectively reduce high-frequency noise, and often require additional noise countermeasure components, which increases costs.
Innovation Solution
A multilayer substrate with circuit bodies laminated through insulating layers and interconnected via conductors, where a magnetic body surrounds the circuit bodies, forming a coiled conductor configuration with capacitors connecting GND circuit bodies to enhance impedance and reduce noise effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional magnetic bodies are used, then magnetic properties are improved, but additional noise countermeasure components are required, increasing cost
Solution Approach 1:
The invention merges the magnetic shielding function and noise countermeasure function into a single integrated structure. The ferrite magnetic body is positioned to simultaneously shield magnetic fields and work with the coiled conductors to provide noise filtering, eliminating the need for separate noise countermeasure components.
Solution Approach 2:
The ferrite magnetic body serves multiple functions: it provides magnetic shielding for sensitive circuits and simultaneously enhances the inductance of the coiled conductors for noise filtering. This multi-functionality reduces the total component count and simplifies the overall device structure.
2Reliability
If high inductance value is achieved through conventional means, then noise reduction is improved, but substrate size increases
Solution Approach 1:
The invention utilizes the vertical dimension by laminating circuit bodies across multiple layers to form three-dimensional coiled conductors. This approach achieves high inductance values within a compact footprint by exploiting the Z-axis direction, thereby maintaining a small substrate area while effectively reducing noise.
3Reliability
If additional noise countermeasure components are added, then noise reduction is improved, but manufacturing cost increases
Solution Approach 1:
The invention combines noise reduction functionality into the existing magnetic body and circuit structure. By positioning the ferrite magnetic body to work with the coiled conductors formed from laminated circuit bodies, the design achieves noise filtering without requiring additional discrete noise countermeasure components, thereby reducing manufacturing cost.
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 solution effectively reduces noise at a low cost by enhancing impedance and improving electromagnetic compatibility without the need for additional noise countermeasure components, while maintaining a compact substrate size.
Implementation Method 1
even though a ferrite magnetic body having high magnetic permeability is used, a high inductance value is hard to be obtained
Implementation Method 2
the first circuit body and the GND circuit body are connected to each other through a capacitor
Data Source
AI summary
A substrate includes a multilayer substrate body in which a plurality of circuit bodies are laminated in a laminating direction through insulating layers and are interlayer connected via a connected conductor formed on each of the insulating layers, and a magnetic body that is arranged in the laminating direction while at least a part of or all of the magnetic body sandwiches the circuit bodies. Each of the circuit bodies includes at least a first circuit body and a second circuit body. The first circuit body is formed of a first extending portion and a first folding portion. The second circuit body is formed of a second extending portion and a second folding portion.