Multilayer Coil Connection Layout for Low Resistance and Low Stray Capacitance

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Solution Overview

Problem

Multilayer coil components face challenges in reducing direct current resistance while preventing an increase in stray capacitance, as existing designs often compromise between conductor overlap areas and electrode positioning.

Innovation Solution

The multilayer coil component design includes a coil with varying connection portions where adjacent coil conductors overlap, increasing the contact area at specific connection points to reduce direct current resistance, while maintaining a distance from the main-surface electrode to prevent increased stray capacitance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the contact area between adjacent coil conductors is increased to reduce direct current resistance, then the area where connection portions and main-surface electrode portion oppose each other increases, which increases stray capacitance

Engineering Contradiction:

Improvedirect current resistanceVSAvoidstray capacitance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by differentiating the overlap areas at different connection portions. Specifically, connection portions are classified into first connection portions (closer to the main-surface electrode portion) and second connection portions (more distant), with the latter having larger overlap areas between adjacent coil conductors. This localized differentiation allows the design to reduce DC resistance where it matters most (at connection portions farther from the electrode) while minimizing stray capacitance effects near the electrode.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent resolves the contradiction by transitioning from a uniform design to a differentiated design across multiple dimensions. It introduces spatial differentiation along the direction from the main surface to the opposite surface, creating varying overlap areas at different connection portions. This dimensional approach allows optimization of DC resistance without proportionally increasing stray capacitance, as the larger overlap areas are positioned where their capacitive effect is minimized.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If the overlap area of adjacent coil conductors is increased uniformly across all connection portions, then direct current resistance decreases, but stray capacitance between connection portions and main-surface electrode portion increases

Engineering Contradiction:

Improvedirect current resistanceVSAvoidstray capacitance

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent implements local quality by creating non-uniform overlap areas at different connection portions. Instead of applying the same overlap area uniformly, it specifies that second connection portions (more distant from the main-surface electrode portion) have larger overlap areas than first connection portions (closer to the electrode). This localized optimization reduces DC resistance where the capacitive coupling is weaker, while maintaining smaller overlap areas near the electrode to minimize stray capacitance.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent applies parameter changes by varying the overlap area parameter across different connection portions. It changes the geometric parameter (overlap area) based on the position of the connection portion relative to the main-surface electrode portion. This parameter differentiation allows the system to achieve lower DC resistance through increased overlap areas at strategic locations without uniformly increasing stray capacitance throughout the structure.

Inventive Principle:

Principle #35Parameter changes

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 design effectively reduces direct current resistance by increasing contact areas between coil conductors and prevents a rise in stray capacitance, enhancing the overall performance of the multilayer coil component.

Implementation Method 1

adjacent coil conductors of the plurality of coil conductors are electrically connected to each other, and the adjacent coil conductors overlap each other

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 2

an area where the second connection portion and the main-surface electrode portion oppose each other may increase stray capacitance between the plurality of connection portions and the main-surface electrode portion

Methodology Applied

Scientific EffectStray capacitance: Parasitic Capacitance

Data Source

PatentUS20230402216A1Multilayer coil component

Publication Date: 2023.12.14 TDK CORP

AI summary

A coil includes a plurality of coil conductors. The coil includes a plurality of connection portions each at which adjacent coil conductors of the plurality of coil conductors are electrically connected to each other and the adjacent coil conductors overlap each other. The plurality of connection portions include a first connection portion and a second connection portion that is farther from an electrode portion on a main surface than the first connection portion. A second area where the adjacent coil conductors overlap each other in the second connection portion is larger than a first area where the adjacent coil conductors overlap each other in the first connection portion.