Multilayer Coil Component Stray Capacitance Reduction
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Solution Overview
Problem
Existing multilayer inductors fail to provide satisfactory radio frequency characteristics, particularly at frequencies above 20 GHz, due to excessive stray capacitance caused by electrode design, which limits their application in high-speed, compact electrical devices.
Innovation Solution
A multilayer coil component with a specific electrode configuration where the first and second outer electrodes cover parts of the end faces and major faces, respectively, while extending to cover lateral faces, reducing stray capacitance and optimizing the stacking direction and axial alignment for improved radio frequency performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If each electrode covers the entirety of both end faces of the multilayer inductor, then the ease of mounting is improved, but the stray capacitance increases causing resonance and poor radio frequency characteristics
Solution Approach 1:
The electrode coverage is segmented rather than continuous. The first outer electrode covers only a first part of the first end face, and the second outer electrode covers only a second part of the second end face, rather than covering the entire end faces. This segmentation reduces the overlapping area between electrodes and the magnetic powder layer, thereby reducing stray capacitance while maintaining adequate mounting areas.
Solution Approach 2:
Different regions of the end faces have different electrode coverage characteristics. The electrodes are strategically positioned to cover specific portions (first part and second part) of the end faces rather than uniformly covering all regions. This local differentiation optimizes the balance between mounting functionality and stray capacitance reduction.
2Strength
If the electrode thickness is increased to improve mechanical strength and mounting reliability, then the structural integrity is improved, but the stray capacitance increases deteriorating radio frequency characteristics
Solution Approach 1:
The patent specifies optimized parameter ranges for electrode thickness (L6) of 5 μm to 20 μm, and for the combined thickness of coil part and electrode (L5) of 50 μm to 150 μm. These parameter changes balance mechanical strength requirements with stray capacitance reduction, enabling satisfactory radio frequency characteristics at 20 GHz and above while maintaining structural integrity for mounting.
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 in the multilayer body, 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. The multilayer coil component has a transmission coefficient S21 at 40 GHz of from about −1.0 dB to about 0 dB.