Multilayer Common-Mode Choke Coil With Low-Stray-Capacitance Turns
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Solution Overview
Problem
Current multilayer common-mode choke coils face challenges in transmitting differential-mode signals effectively at higher frequencies (20 GHz to 30 GHz) and suppressing common-mode noise components, due to limitations in high-frequency characteristics.
Innovation Solution
A multilayer common-mode choke coil design with a reduced number of turns in its coil conductors, specifically less than 2, and strategically positioned terminal electrodes, which reduces stray capacitance and improves high-frequency performance by minimizing overlap and optimizing the distance between coil conductors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of turns in coil conductors is increased to improve inductance, then the common-mode noise suppression is enhanced, but the stray capacitance increases which degrades high-frequency characteristics
Solution Approach 1:
The patent changes the critical parameter of coil structure from multiple turns to less than 2 turns (essentially single-turn or half-turn configuration). This parameter change simultaneously achieves low stray capacitance for high-frequency operation while maintaining sufficient inductance through optimized conductor geometry and positioning, thereby resolving the contradiction between noise suppression and high-frequency performance
2Reliability
If the coil conductor overlap area is increased to enhance magnetic coupling, then the common-mode attenuation is improved, but the stray capacitance increases which limits high-frequency transmission
Solution Approach 1:
The patent optimizes the geometric parameters of the coil conductors by reducing the overlap area through the less-than-2-turns configuration. This parameter optimization reduces stray capacitance effects that limit high-frequency transmission, while the magnetic coupling is maintained through precise positioning and conductor geometry design in the multilayer structure
3Reliability
If the distance between coil conductors is reduced to increase coupling, then the common-mode noise suppression is enhanced, but the parasitic capacitance between conductors increases which degrades high-frequency characteristics
Solution Approach 1:
The patent changes the spatial parameter configuration by using the less-than-2-turns coil design with optimized conductor spacing in the multilayer body. This configuration achieves strong magnetic coupling for noise suppression while controlling parasitic capacitance through the specific geometric arrangement, enabling high-frequency operation up to 30 GHz and beyond
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 design enhances high-frequency characteristics by reducing stray capacitance, allowing for effective transmission of differential-mode signals and suppression of common-mode noise components at frequencies up to 30 GHz and beyond.
Implementation Method 1
the first coil conductor and the second coil conductor each have a number of turns of less than 2. According to preferred embodiment of the present disclosure, the stray capacitance between the first coil and the second coil can be reduced to thereby improve high-frequency characteristics.
Data Source
AI summary
A common-mode choke coil includes a multilayer body, a first coil, a second coil, a first terminal electrode, a second terminal electrode, a third terminal electrode, and a fourth terminal electrode. The multilayer body includes plural non-conductor layers. The first and second coils are incorporated in the multilayer body. The first and second terminal electrodes are connected to the first coil. The third and fourth terminal electrodes are connected to the second coil. The first coil includes a first coil conductor. The second coil includes a second coil conductor disposed along an interface between non-conductor layers different from an interface between non-conductor layers along which the first coil conductor is disposed. The first and second coil conductors each have a number of turns of less than 2.