Coil Component Terminal Cutout Layout for Lower Stray Capacitance
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Solution Overview
Problem
In coil components with a mounting surface perpendicular to the coil axis, stray capacitance increases due to overlap between the terminal electrode and coil pattern, deteriorating high-frequency characteristics, and reducing the terminal electrode area is insufficient.
Innovation Solution
The coil component design includes terminal electrodes with cutout parts to avoid overlap with the coil patterns, ensuring a sufficient exposed area while reducing stray capacitance, and incorporates a magnetic material layer for high magnetic coupling and increased inductance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the terminal electrode and coil pattern overlap each other in the coil axis direction, then the area of the terminal electrode is increased, but the stray capacitance of the coil pattern increases which deteriorates high-frequency characteristics
Solution Approach 1:
The patent applies dimensionality change by transitioning from a planar layout to a three-dimensional stacked configuration. The coil pattern is formed in an inner layer while the terminal electrode is positioned in an outer layer, separating them in the vertical dimension (coil axis direction). This spatial separation eliminates overlap in plan view, reducing stray capacitance while maintaining sufficient terminal electrode area for electrical connection.
2Object-affected harmful factors
If the planar shape of the terminal electrode is reduced to avoid overlap with the coil pattern, then the stray capacitance is reduced, but the area of the terminal electrode becomes insufficient
Solution Approach 1:
The patent resolves this contradiction by utilizing the vertical dimension to separate the terminal electrode from the coil pattern. Instead of reducing the terminal electrode area in the planar view, the design places the coil pattern in an inner layer and the terminal electrode in an outer layer, allowing both to maintain their required areas without harmful overlap in plan view.
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 achieves reduced stray capacitance, improved high-frequency characteristics, and enhanced attenuation of common mode signals across various frequency bands.
Implementation Method 1
a coil pattern embedded in the element body and having a coil axis extending perpendicular to the mounting surface
Implementation Method 2
incorporates a magnetic material layer for high magnetic coupling and increased inductance
Data Source
AI summary
Disclosed herein is a coil component that includes an element body having a mounting surface, a coil pattern embedded in the element body and having a coil axis extending perpendicular to the mounting surface, and a terminal electrode connected to the coil pattern and exposed to the mounting surface. The terminal electrode has a cutout part so as to avoid overlapping with the coil pattern in a plan view along the coil axis.