Multilayer Coil Electrode Layout for Higher SRF and Q Factor
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Solution Overview
Problem
The existing coil components experience a decrease in self-resonant frequency and quality factor due to increased parasitic capacitance caused by electric field concentration between the coil turns and external electrodes.
Innovation Solution
The coil component design includes external electrodes positioned on the main surfaces, with the outermost turns connected to these electrodes in a manner that reduces the facing area, minimizing parasitic capacitance and enhancing the self-resonant frequency and quality factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coil is connected to external electrodes with turns facing each other, then the electrical connection is achieved, but parasitic capacitance increases causing self-resonant frequency and quality factor to decrease
Solution Approach 1:
The patent applies local quality by making the facing area between outermost turns and external electrodes smaller than the facing area between inner turns and external electrodes. This creates a non-uniform distribution where the critical regions (outermost turns) have reduced parasitic capacitance while inner turns maintain normal connection areas, thus improving quality factor without compromising electrical connection.
Solution Approach 2:
The patent introduces asymmetry in the facing areas between coil turns and external electrodes. Specifically, the facing area at the outermost turns is deliberately made smaller than at inner turns, creating an asymmetric configuration that reduces electric field concentration and parasitic capacitance at the critical outer regions, thereby increasing self-resonant frequency and quality factor.
2Object-affected harmful factors
If the facing area between outermost turns and external electrodes is reduced, then parasitic capacitance decreases and self-resonant frequency increases, but the connection structure becomes more complex
Solution Approach 1:
The patent implements local quality by selectively reducing the facing area only at the outermost turns while maintaining normal facing areas for inner turns. This localized modification approach reduces parasitic capacitance where it matters most without requiring a complete redesign of the entire connection structure, thus limiting the increase in device complexity.
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 effectively reduces parasitic capacitance, thereby improving the quality factor and increasing the self-resonant frequency while ensuring secure mounting to circuit boards.
Implementation Method 1
the parasitic capacitance (stray capacitance) generated between the turn of the coil and the external electrode increases, and thus the self-resonant frequency (SRF) decreases and the quality factor (Q) value also decreases
Data Source
AI summary
In a coil 5 of a multilayer coil component 1, an end portion 6a of a turn 6 closest to a side surface 2e in the facing direction of the side surface 2e and a side surface 2f is connected to a first external electrode 3 and an end portion 11a of a turn 11 closest to the side surface 2f in the facing direction of the pair of side surfaces 2e and 2f is connected to a second external electrode 4. The area at which the turn 6 faces the second external electrode 4 and the area at which the turn 11 faces the first external electrode 3 are smaller than the area at which turns 7, 8, 9, and 10 other than the turn 6 and the turn 11 face the first external electrode 3 or the second external electrode 4.