Common Mode Noise Filter Laminated Structure High Frequency
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Solution Overview
Problem
Conventional common mode noise filters experience increased loss and inefficiency at high frequencies due to differences in coil lengths and magnetic coupling, making them unsuitable for high-speed digital data transmission in electronic equipment.
Innovation Solution
The design includes a laminated body with coil conductors of equal lengths and overlapping configurations to ensure consistent magnetic coupling and reduced stray capacitance, allowing for efficient filtering of high-frequency signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional common mode noise filters are used, then they can filter noise at low frequencies, but they experience increased loss and inefficiency at high frequencies
Solution Approach 1:
The filter is divided into multiple insulating layers (first to fourth insulating layers) with coil conductors distributed across different layers. This segmentation allows for optimized magnetic coupling paths and reduced stray capacitance, enabling effective high-frequency noise filtering while maintaining signal integrity
Solution Approach 2:
The patent transitions from a planar two-dimensional layout to a three-dimensional laminated structure where coil conductors are arranged on multiple stacked insulating layers. This dimensional change enables better magnetic coupling between coils while minimizing parasitic capacitance, resolving the contradiction between filtering efficiency and signal loss at high frequencies
2Ease of manufacture
If coil conductors are arranged in conventional configurations, then manufacturing is simplified, but magnetic coupling consistency and stray capacitance control are compromised
Solution Approach 1:
The patent combines multiple coil conductors (first to fourth coil conductors) across different insulating layers to form integrated coil structures. The first and second coil conductors form one coil, while the third and fourth coil conductors form another coil. This merging approach ensures consistent magnetic coupling and controlled stray capacitance while maintaining manufacturing feasibility through standardized lamination processes
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
This configuration enables effective common mode noise filtering at high frequencies, maintaining signal quality and reducing losses, making it suitable for high-speed digital data transmission in electronic equipment.
Implementation Method 1
first to fourth coil conductors spirally extending to be disposed on upper surfaces of the first to fourth insulating layers
Data Source
AI summary
A common mode noise filter includes a laminated body including first to fourth insulating layers stacked on one another, first to fourth coil conductors spirally extending and disposed on upper surfaces of the first to fourth insulating layers, respectively, a first via-electrode connecting the first coil conductor to the second coil conductor, a second via-electrode connecting the third coil conductor to the fourth coil conductor, first and second connection parts connecting the first via-electrode to first and second inner ends of the first and second coil conductors, respectively, and third and fourth connection parts connecting the second via-electrode to third and fourth inner ends of the third and fourth coil conductors, respectively. The first connection part overlaps the second connection part when viewed from above. The third connection part overlaps the fourth connection part when viewed from above. The common mode noise filter is operable in high frequencies.