Multilayer Coil Structure Balancing Inductance and Stray Capacitance
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Solution Overview
Problem
Existing multilayer coil components face increased stray capacitance and decreased self-resonant frequency and quality factor due to larger coil diameters, which reduces their performance characteristics.
Innovation Solution
The multilayer coil component design includes a configuration where the first connection conductor is positioned farther from the second coil portion, with a larger distance between them, and the coil portions have different diameters, overlapping at their edges, to minimize stray capacitance and increase inductance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the diameter of the coil is increased to improve characteristics, then the inductance is improved, but the stray capacitance between the coil and connection conductor increases, causing self-resonant frequency and quality factor to decrease
Solution Approach 1:
The coil is divided into a first coil portion and a second coil portion with different diameters. The first coil portion has a larger diameter to increase inductance, while the second coil portion has a smaller diameter to reduce stray capacitance with the connection conductor. This segmentation allows the coil to simultaneously achieve high inductance and low stray capacitance, improving self-resonant frequency and quality factor.
Solution Approach 2:
Different portions of the coil are given different local properties: the first coil portion has a larger diameter for high inductance contribution, while the second coil portion has a smaller diameter for low stray capacitance. This local differentiation optimizes the overall coil performance by balancing inductance and capacitance effects in different spatial regions.
2Reliability
If the diameter of the first coil portion is increased to increase inductance, then the inductance is improved, but the distance between the connection conductor and the coil decreases, increasing stray capacitance
Solution Approach 1:
The coil is segmented into two portions with different diameters positioned at different locations relative to the connection conductor. The first coil portion with larger diameter is positioned where it can contribute to inductance without excessively reducing distance to the connection conductor, while the second coil portion with smaller diameter is positioned to minimize stray capacitance. This spatial segmentation resolves the contradiction between inductance enhancement and stray capacitance reduction.
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 enhances the coil's characteristics by maintaining a larger diameter for the first coil portion while reducing capacitance between the connection conductor and the second coil portion, thereby improving performance.
Implementation Method 1
stray capacitance (parasitic capacitance) formed by the coil and the connection conductor
Implementation Method 2
inside the multilayer body, the conductors are connected to each other in a spiral shape with a stacking direction of the units as an axis
Data Source
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 connection conductor 6, and a second connection conductor 7. The coil 5 includes a first coil portion 8 that has one end of the coil 5 and is disposed on a side of a main surface 2c and a second coil portion 9 that has the other end of the coil 5 and is disposed on a side of the main surface 2d. A distance L2 between the first connection conductor 6 and the second coil portion 9 is larger than a distance L1 between the first connection conductor 6 and the first coil portion 8.