Common Mode Filter With Coil-Shaped Shunt Electrode
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Solution Overview
Problem
Common mode filters previously proposed do not provide sufficient attenuation characteristics in the low-frequency domain, particularly in the communications frequency band of 0.7 GHz to 2.6 GHz, while achieving broadband attenuation characteristics.
Innovation Solution
A common mode filter design incorporating a coil-shaped shunt electrode layer between multiple coil electrode layers, which enhances inductance and improves attenuation characteristics in the low-frequency domain by relocating a pole to this range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shunt electrode structure is used to achieve broadband attenuation characteristics, then attenuation in high-frequency domain is improved, but attenuation in low-frequency domain deteriorates
Solution Approach 1:
The shunt electrode is divided into multiple segments along the stacking direction, with each segment having different coil shapes (first coil shape in lower portion, second coil shape in upper portion). This segmentation allows each segment to target different frequency ranges, thereby achieving both low-frequency and high-frequency attenuation simultaneously.
Solution Approach 2:
Different portions of the shunt electrode are given different local characteristics through varying coil shapes. The lower portion has a first coil shape optimized for low-frequency attenuation, while the upper portion has a second coil shape optimized for high-frequency attenuation. This local differentiation resolves the contradiction by making each portion specialized for its frequency range.
2Reliability
If conventional shunt electrode structure is used, then broadband attenuation is achieved, but sufficient attenuation in communications frequency band (0.7 GHz to 2.6 GHz) is not provided
Solution Approach 1:
The shunt electrode structure is made dynamically adaptable to different frequency requirements through the varying coil shapes along its length. The coil shape transitions from the first type in the lower portion to the second type in the upper portion, creating a dynamic response across the frequency spectrum that specifically enhances attenuation in the communications frequency band while maintaining broadband performance.
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 coil-shaped shunt electrode layer effectively provides broadband attenuation characteristics across 0.7 GHz to 2.8 GHz, addressing the insufficient low-frequency attenuation of previous designs and ensuring better noise suppression in digital devices.
Implementation Method 1
A common mode filter design incorporating a coil-shaped shunt electrode layer between multiple coil electrode layers, which enhances inductance and improves attenuation characteristics in the low-frequency domain by relocating a pole to this range.
Data Source
AI summary
A common mode filter includes a body portion including an external electrode disposed outwardly of the body portion, a plurality of coil electrode layers disposed within the body portion and electrically connected to the external electrode, and a shunt electrode layer disposed between portions of the plurality of coil electrode layers and having a coil shape.