Multilayer Inductor Conductor Layout for Higher Self-Resonant Frequency
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Solution Overview
Problem
The self-resonant frequency of multilayer inductors is often decreased due to stray capacitance generated between the wraparound terminal electrodes and the linear conductor portion.
Innovation Solution
The multilayer inductor design includes a linear conductor portion with a first portion overlapping the terminal electrode and a second portion not overlapping it, where the width of the first portion is smaller than the second portion, reducing stray capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the terminal electrode wraps around from the end surface to the side surface, then the terminal electrode can be provided on the side surface for mounting purposes, but stray capacitance is generated between the wraparound portion and the linear conductor portion, decreasing the self-resonant frequency
Solution Approach 1:
The conductor portion is designed with different widths in different regions: a first width in the region overlapping the terminal electrode and a second width in the region not overlapping. This local variation in geometry allows the overlapping region to have smaller stray capacitance while maintaining adequate current carrying capacity, thus improving self-resonant frequency without compromising mounting capability
Solution Approach 2:
The conductor portion is divided into multiple regions based on its positional relationship with the terminal electrode: a first region overlapping the terminal electrode and a second region not overlapping. This segmentation allows different geometric characteristics (widths) to be applied to different regions, optimizing both stray capacitance reduction and current conduction
2Reliability
If the width of the conductor portion is reduced in the overlapping region, then stray capacitance is reduced and self-resonant frequency is improved, but the cross-sectional area is reduced which may increase DC resistance
Solution Approach 1:
The conductor portion has different widths in different regions: a narrower first width in the overlapping region to reduce stray capacitance, and a wider second width in the non-overlapping region to reduce DC resistance. This local differentiation allows simultaneous optimization of both self-resonant frequency and DC resistance characteristics
Solution Approach 2:
The conductor portion is segmented into a first region (overlapping with terminal electrode) and a second region (not overlapping), with each region having optimized width characteristics. The first region minimizes stray capacitance while the second region minimizes DC resistance, achieving both goals through spatial segmentation
Data Source
AI summary
A multilayer inductor includes: an element body formed by stacking a plurality of layers of insulators in a stacking direction; a terminal electrode provided on at least one side surface of the element body; and a linear conductor portion provided in the element body and extending in a first direction, wherein, as viewed from a second direction perpendicular to the first direction, the conductor portion has a first portion in a region overlapping the terminal electrode and a second portion in a region not overlapping the terminal electrode, and wherein a width of the first portion as viewed from the second direction is smaller than a width of the second portion.