Laminated Common Mode Filter With Ground-Layer Capacitance
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Solution Overview
Problem
Existing mobile terminals require a transmission method capable of handling high-speed data transmission and effectively removing noise current in a common mode, as the MIPI D-PHY standard is insufficient for the increased data rates.
Innovation Solution
A laminated common mode filter is designed with alternating coil patterns and a ground layer to form additional capacitance, enhancing signal transmission and noise removal by overlapping coil patterns with a ground pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If additional electrode layers are added to increase capacitance, then capacitance increases, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The ground layer is merged with the intermediate layer between upper and lower electrode layers, serving dual functions as both structural support and capacitance-forming element. This eliminates the need for separate additional electrode layers while achieving the required capacitance increase.
Solution Approach 2:
The ground layer performs multiple functions: it provides electrical grounding, serves as a structural intermediate layer, and forms capacitance with both upper and lower electrode patterns. This multi-functionality increases capacitance without adding dedicated capacitance-forming structures.
2Area of moving object
If coil patterns are placed closer together to reduce area, then area decreases, but manufacturing precision requirements increase
Solution Approach 1:
The patent utilizes the vertical dimension by stacking electrode layers at different heights (upper, ground, lower layers) to achieve capacitance increase and area reduction without requiring higher horizontal precision. The Z-axis separation allows closer horizontal spacing while maintaining manufacturability.
3Object-affected harmful factors
If the attenuation band is expanded to improve noise rejection, then noise rejection improves, but the filter structure becomes more complex
Solution Approach 1:
The patent changes the electrical parameters (capacitance values) by adjusting the geometry and positioning of electrode patterns relative to the ground layer. This parameter optimization expands the attenuation band and improves noise rejection without requiring additional filter stages or complex circuitry.
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 laminated common mode filter increases capacitance without additional electrode layers, expanding the attenuation band and improving noise rejection in high-speed data transmission.
Implementation Method 1
The ground pattern is disposed to overlap the coil pattern of the upper electrode layer and the coil pattern of the lower electrode layer and configured to form capacitance
Data Source
AI summary
Proposed is a laminated common mode filter in which a ground pattern is interposed between coil patterns to form additional capacitance. The proposed laminated common mode filter comprises: an upper electrode layer composed of a laminate having a first coil pattern, a second coil pattern, and a third coil pattern; a ground layer that is arranged on the lower portion of the upper electrode layer and has a ground pattern; and a lower electrode layer that is arranged on the lower portion of the ground layer and is composed of a laminate having a fourth coil pattern, a fifth coil pattern, and a sixth coil pattern, wherein the ground pattern is arranged to overlap the coil patterns of the upper electrode layer and the coil patterns of the lower electrode layer to form capacitance.