Multilayer Coil Component Land Portion Diameter Optimization
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Solution Overview
Problem
Existing multilayer coil components face challenges in achieving large impedance and improved radio frequency characteristics due to stray capacitance caused by land portions with large diameters, which degrade radio frequency characteristics and limit coil diameter, making it difficult to obtain optimal performance in the radio frequency range.
Innovation Solution
A multilayer coil component design featuring a coil formed by stacking insulating layers with coil conductors, where the land portions of adjacent coil conductors are connected by via conductors, ensuring the land portions do not overlap inside the line portions, and have diameters between 1.05 to 1.3 times the line width, maintaining a sufficient coil diameter and reducing stray capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the land portion diameter is increased to ensure the center does not overlap the opposite line portion, then the reliability of electrical connection is improved, but the stray capacitance increases and radio frequency characteristics deteriorate
Solution Approach 1:
The patent optimizes the land portion diameter to be 0.6 to 1.2 times the line portion width, establishing a quantitative parameter range that balances connection reliability with stray capacitance control. This parameter optimization resolves the contradiction by finding the optimal size that ensures electrical connection without excessive capacitance.
Solution Approach 2:
The patent positions the land portion center offset from the line portion center by 0.05 to 0.2 times the line portion width, creating an asymmetric local configuration. This local quality adjustment ensures reliable electrical connection while minimizing the land portion's overlap with the opposite line portion, thereby reducing stray capacitance.
2Reliability
If the land portion is positioned inside the inner periphery of the line portion, then the electrical connection is ensured, but the coil diameter decreases and large impedance cannot be obtained
Solution Approach 1:
The patent employs asymmetric positioning where the land portion center is offset from the line portion center by 0.05 to 0.2 times the line portion width. This asymmetric arrangement allows the land portion to extend beyond the line portion's inner periphery while maintaining reliable electrical connection, thereby preserving a larger coil diameter for achieving large impedance.
Solution Approach 2:
The patent establishes specific parameter ranges for the offset distance (0.05 to 0.2 times line width) and land portion diameter (0.6 to 1.2 times line width) to optimize the balance between connection reliability and coil diameter, enabling large impedance while ensuring electrical connection.
3Reliability
If the land portion diameter is increased, then the electrical connection area is improved, but the radio frequency characteristics are degraded due to increased stray capacitance
Solution Approach 1:
The patent defines an optimal land portion diameter range of 0.6 to 1.2 times the line portion width, which quantitatively balances the electrical connection area with stray capacitance control. This parameter optimization ensures sufficient connection area while limiting the diameter to prevent excessive capacitance that would degrade radio frequency characteristics.
Solution Approach 2:
The patent implements asymmetric positioning with the land portion center offset from the line portion center by 0.05 to 0.2 times the line portion width. This local quality adjustment optimizes the connection area distribution, ensuring reliable electrical connection while minimizing the land portion's extension that would increase stray capacitance and affect radio frequency performance.
Data Source
AI summary
A multilayer coil component includes a multilayer body, and first and second outer electrodes. The multilayer body is formed by stacking plural insulating layers in a length direction, and includes a coil incorporated therein. The first and second outer electrodes are electrically connected to the coil. The coil is formed by electrically connecting plural coil conductors. The multilayer body has first and second end surfaces, first and second major surfaces, and first and second lateral surfaces. Each coil conductor has a line portion, and a land portion. As viewed in plan in the stacking direction, the land portion is not located inside the inner periphery of the line portion, and partially overlaps the line portion. As viewed in plan in the stacking direction, the land portion has a diameter of from about 1.05 times to about 1.3 times the line width of the line portion.