Coil Component with Grounded Electrode for High-Frequency Noise Suppression
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Solution Overview
Problem
Filter circuits with capacitors face noise suppression degradation due to equivalent series inductance, and widening the frequency band is restricted by stray capacitances generated by magnetically coupled coils, limiting attenuation to frequencies below the MHz band.
Innovation Solution
A coil component with a first and second magnetically coupled coil, along with a grounded electrode adjacent to or near the coils, redirects noise signals through stray capacitances to the electrode, reducing the frequency band of noise signals and widening the attenuation effect of the filter circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two magnetically coupled coils are used to generate negative inductance to cancel equivalent series inductance of capacitor, then the frequency band where attenuation effect occurs is widened, but stray capacitances generated by the two magnetically coupled coils cause noise signals of 1 GHz or higher to pass through the filter circuit, limiting the attenuation effect to frequencies lower than the MHz band
Solution Approach 1:
A grounded electrode is introduced as an intermediary element positioned adjacent to the magnetically coupled coils. This electrode acts as a mediator to intercept and redirect noise signals that would otherwise pass through the stray capacitances of the coils, channeling them to ground instead of allowing them to propagate through the filter circuit.
Solution Approach 2:
The stray capacitances of the magnetically coupled coils, which originally caused harmful high-frequency noise transmission, are converted into a beneficial mechanism. By positioning a grounded electrode near the coils, the stray capacitances are utilized to redirect noise signals toward the grounded electrode, transforming the harmful effect into a noise suppression mechanism.
2Object-affected harmful factors
If a grounded electrode is positioned adjacent to the magnetically coupled coils to redirect noise signals, then high-frequency noise suppression is enhanced, but the device complexity increases
Solution Approach 1:
The grounded electrode serves multiple functions simultaneously: it acts as a reference potential for the filter circuit, provides a termination point for noise signals through stray capacitance, and enables high-frequency noise suppression without requiring additional active components or complex circuitry. This multi-functionality reduces the overall device complexity despite adding the electrode.
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 signal transmission through stray capacitances, enhancing high-frequency noise suppression and expanding the frequency band where the filter circuit's attenuation effect occurs, without compromising magnetic coupling or increasing filter size.
Implementation Method 1
two magnetically coupled coils
Implementation Method 2
a negative inductance generated by two magnetically coupled coils
Implementation Method 3
stray capacitances generated by the two magnetically coupled coils
Data Source
AI summary
A coil component includes a first coil and a second coil that magnetically couples with the coil and causes a negative inductance to be generated. The coil component further includes an electrode that is provided at a position adjacent to or in the vicinity of a port of each of the first and second coils.