Multilayer Coil Component Stray Capacitance Reduction
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Solution Overview
Problem
Existing multilayer inductors do not support satisfactory radio frequency characteristics above 20 GHz due to large stray capacitance caused by electrode design, which interferes with inductance components.
Innovation Solution
A multilayer coil component with a coil built inside a stacked insulating body, featuring outer electrodes that cover only specific areas of the end and major faces, and connecting conductors with lengths between 2.5% to 7.5% of the body length, optimizing electrode placement to reduce stray capacitance and enhance radio frequency performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electrodes cover the entirety of both end faces of the multilayer inductor, then ease of mounting is improved, but stray capacitance increases causing resonance with inductance component
Solution Approach 1:
The electrode configuration transitions from uniform coverage to non-uniform distribution. The first electrode covers only a portion of the first end face, while the second electrode covers a different portion of the second end face, creating local variations in electrode coverage that reduce overall stray capacitance while maintaining mounting capability.
Solution Approach 2:
The electrode coverage is segmented rather than continuous. By dividing the end face coverage into specific portions rather than covering the entire surface, the patent reduces the total electrode area and consequently reduces stray capacitance while preserving essential electrical connections.
2Strength
If electrode thickness is increased for robustness, then mechanical strength is improved, but stray capacitance increases deteriorating radio frequency characteristics
Solution Approach 1:
The patent optimizes the electrode thickness parameter to a specific range (5 μm to 20 μm) that balances mechanical strength and electrical performance. This parameter optimization ensures sufficient structural robustness while minimizing stray capacitance effects at radio frequencies.
Data Source
AI summary
A multilayer coil component includes a multilayer body formed by stacking a plurality of insulating layers and including a coil built therein, and first and second outer electrodes electrically connected to the coil. The coil is formed by electrically connecting a plurality of coil conductors stacked together with the insulating layers. The multilayer coil component further includes, inside the multilayer body, first and second connecting conductors. The first connecting conductor connects between a portion of the first outer electrode covering the first end face, and a coil conductor facing the portion. The second connecting conductor connects between a portion of the second outer electrode covering the second end face, and a coil conductor facing the portion. Concerning the length direction, the first and second connecting conductors each have a length from about 2.5% to about 7.5% of the length of the multilayer body.