Multilayer Coil Layout With Curved Conductor for Lower Stray Capacitance

Solution Overview

Problem

Existing multilayer coil components face challenges in increasing coil diameter while maintaining a certain distance from connecting conductors to reduce stray capacitance and magnetic flux concentration, leading to decreased self-resonant frequency and quality factor.

Innovation Solution

The multilayer coil component design includes connecting conductors with hypotenuse shapes that ensure a distance from the coil, suppressing stray capacitance and magnetic flux concentration by avoiding corner portions, allowing for increased coil diameter.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the coil diameter is increased to improve characteristics, then the coil performance is improved, but the distance between the connecting conductor and the coil decreases, leading to increased stray capacitance

Engineering Contradiction:

Improvecoil diameterVSAvoidstray capacitance

Core Design Contradiction:

Volume of moving objectVSObject-affected harmful factors

Solution Approach 1:

The connecting conductor is designed with a curved surface instead of a prismatic shape. Specifically, the facing surface of the connecting conductor that faces the coil is formed as an arc surface, which allows the coil to be shaped along the outer shape of the connecting conductor. This curvature enables maximizing the coil diameter while maintaining a certain distance between the coil and the connecting conductor, thereby reducing stray capacitance.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Volume of moving object

If the coil is shaped along the outer shape of the connecting conductor to maximize diameter, then the coil diameter is increased, but corner portions are formed causing magnetic flux concentration and magnetic saturation

Engineering Contradiction:

Improvecoil diameterVSAvoidmagnetic flux concentration

Core Design Contradiction:

Volume of moving objectVSObject-generated harmful factors

Solution Approach 1:

The connecting conductor is designed with a curved surface instead of a prismatic shape. Specifically, the facing surface of the connecting conductor that faces the coil is formed as an arc surface, which allows the coil to be shaped along the outer shape of the connecting conductor. This curvature enables maximizing the coil diameter while maintaining a certain distance between the coil and the connecting conductor, thereby reducing stray capacitance.

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Ease of manufacture

If a prismatic connecting conductor is used, then the manufacturing is simplified, but the coil cannot be optimally shaped to avoid corner portions and maintain distance

Engineering Contradiction:

Improveconnecting conductor fabricationVSAvoidstray capacitance

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The connecting conductor is designed with a curved surface instead of a prismatic shape. Specifically, the facing surface of the connecting conductor that faces the coil is formed as an arc surface, which allows the coil to be shaped along the outer shape of the connecting conductor. This curvature enables maximizing the coil diameter while maintaining a certain distance between the coil and the connecting conductor, thereby reducing stray capacitance.

Inventive Principle:

Principle #14Spheroidality (Curvature)

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 suppresses stray capacitance and maintains improved coil characteristics by ensuring a distance between the coil and connecting conductors, preventing decreases in self-resonant frequency and quality factor.

Implementation Method 1

a coil disposed in the element body and having a coil axis extending along a first direction in which the pair of main surfaces face each other

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

an increase in coil diameter in a configuration in which a connecting conductor is disposed in an element body leads to a decrease in the distance between the connecting conductor and the coil. As a result, the stray capacitance (parasitic capacitance) formed by the coil and the connecting conductor may increase

Methodology Applied

Scientific EffectStray capacitance: Parasitic Capacitance

Implementation Method 3

a coil is provided with a corner portion on condition that the coil is shaped along the outer shape of the connecting conductor. In this case, magnetic flux concentration on the corner portion results in magnetic saturation

Methodology Applied

Scientific EffectMagnetic flux concentration: Magnetic Field

Data Source

PatentUS12580117B2Multilayer coil component

Publication Date: 2026.03.17 TDK CORP

AI summary

A multilayer coil component 1 includes an element body 2, a coil 5, a first terminal electrode 3, a second terminal electrode 4, a first connecting conductor 6, and a second connecting conductor 7. The first connecting conductor 6 extends along a first direction D1 and has a third side 6c intersecting with a second direction D2 and a third direction D3 in a cross section orthogonal to the extension direction. The coil 5 faces the third side 6c of the first connecting conductor 6 when viewed from the first direction D1, and a side 5a facing the third side 6c is parallel to the third side 6c at the part that faces the third side 6c of the first connecting conductor 6.