Multilayer Coil Component with Constant Diameter Conductors
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Solution Overview
Problem
Existing multilayer coil components suffer from unsatisfactory radio-frequency characteristics, particularly in the GHz band, due to increased stray capacitance caused by the stepwise or continuous decrease in coil diameter, which affects their performance as noise absorbing components.
Innovation Solution
A multilayer coil component design featuring a multilayer body with a coil built inside, where the coil conductors have different diameters and are electrically connected with insulating layers, and outer electrodes are strategically positioned to minimize coverage of end and main surfaces, reducing stray capacitance and enhancing radio-frequency characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the coil diameter decreases in a stepwise or continuous manner in the axial direction, then the resonant frequency is dispersed and wide band characteristics are achieved, but the stray capacitance increases and radio-frequency characteristics are degraded
Solution Approach 1:
Instead of decreasing the coil diameter in the axial direction to achieve frequency dispersion, the patent inverts the approach by maintaining a constant coil diameter throughout the axial direction. This inversion prevents the generation of stray capacitance while still achieving wide band characteristics through other means, such as the multilayer structure and electrode configuration.
Solution Approach 2:
The patent applies local quality by varying the electrode dimensions and positions in different regions of the multilayer structure. The first and second electrodes have different configurations in different layers, allowing local optimization of electrical characteristics while maintaining overall constant coil diameter, thus achieving frequency dispersion without increasing stray capacitance.
2Adaptability or versatility
If the coil diameter decreases in a stepwise or continuous manner, then wide band characteristics are obtained, but the external electrodes become larger and stray capacitances are increased
Solution Approach 1:
The patent inverts the conventional approach by maintaining a constant coil diameter instead of decreasing it. This inversion allows the external electrodes to maintain consistent dimensions across layers, preventing electrode area enlargement while still achieving wide band characteristics through the multilayer configuration and controlled electrode positioning.
Solution Approach 2:
The patent changes the parameter of coil diameter from variable (decreasing) to constant, and simultaneously adjusts electrode dimensions and positions as compensating parameters. This parameter transformation maintains electrical performance while preventing the harmful effect of increased electrode area and stray capacitance.
3Shape
If the lead conductor and lead out conductor positions are shifted, then the coil structure is formed, but the external electrodes become larger and radio-frequency characteristics are degraded
Solution Approach 1:
The patent applies local quality by precisely controlling the position of lead conductors and lead out conductors in different layers. The first and second electrodes are positioned with specific offsets relative to each other in different layers, creating the necessary coil structure locally while maintaining overall alignment that prevents stray capacitance generation and preserves radio-frequency characteristics.
Data Source
AI summary
A multilayer coil component includes a multilayer body that is formed by stacking a plurality of insulating layers on top of one another and that has a coil built into the inside thereof; and a first outer electrode and a second outer electrode that are electrically connected to the coil. The coil is formed by electrically connecting a plurality of coil conductors, which are stacked together with insulating layers, to one another. A first main surface of the multilayer body is a mounting surface. A stacking direction of the multilayer body and an axial direction of the coil are parallel to the mounting surface. The coil includes a plurality of different coil conductors having different coil diameters, and shortest distances from the first main surface to the coil conductors are identical for all of the plurality of different coil conductors.