Inductor Electrode Protrusion Layout for Lower Stray Capacitance
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Solution Overview
Problem
Inductor components face challenges in reducing stray capacitance between the lower side portion of the inductor wiring and electrodes while maintaining sufficient fixing force to a substrate, as increasing the distance between electrodes to reduce capacitance can lead to insufficient fixing force.
Innovation Solution
The inductor component design includes a protrusion portion on the electrode that protrudes from the bottom surface electrode portion, with a maximum dimension smaller than the bottom surface electrode portion, ensuring the electrode is exposed on the bottom surface within the wiring range, thereby reducing stray capacitance while maintaining a strong fixing force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the area of each electrode exposed on the bottom surface is reduced to increase the distance to the lower side portion, then the stray capacitance is reduced, but the fixing force of the inductor component to the substrate becomes insufficient
Solution Approach 1:
The electrode is segmented into two distinct portions: a bottom surface electrode portion that provides fixing force to the substrate, and a protrusion portion that extends into the wiring range to reduce stray capacitance. This segmentation allows each portion to fulfill its specific function independently, resolving the contradiction between fixing force and capacitance reduction.
Solution Approach 2:
Different portions of the electrode have different geometrical properties and functions. The bottom surface electrode portion has a larger area optimized for mechanical attachment, while the protrusion portion has a smaller area optimized for electrical isolation. This local differentiation of quality allows the electrode to simultaneously achieve strong fixing and low stray capacitance.
2Strength
If the area of each electrode exposed on the bottom surface is increased to enhance fixing force, then the fixing force is improved, but the stray capacitance between the electrode and inductor wiring increases
Solution Approach 1:
The electrode is divided into functional segments where the bottom surface electrode portion maximizes area for fixing force, while the protrusion portion minimizes area exposure in the wiring range to control stray capacitance. This segmentation enables independent optimization of each function.
Solution Approach 2:
The electrode structure implements local quality differentiation by concentrating the area needed for mechanical strength at the bottom surface, while limiting the area exposed in the wiring range through the protrusion geometry. This local optimization resolves the trade-off between fixing force and capacitance.
Data Source
AI summary
An inductor component including an element body and an inductor wiring having a lower side portion including a portion closest to a bottom surface of an element body and extending along the bottom surface. In the element body, a range from a first virtual plane to a second virtual plane is defined as a wiring range. A first protrusion portion of a first electrode protrudes from an end of a first bottom surface electrode portion of the first electrode on a second end surface side toward the second end surface side. A maximum dimension of the first protrusion portion in a direction perpendicular to a first main surface is smaller than a maximum dimension of the first bottom surface electrode portion in the direction perpendicular to the first main surface. At least a part of the first protrusion portion on the bottom surface is located within the wiring range.