Multilayer Coil Structure With Air Cavities for Lower Stray Capacitance
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Solution Overview
Problem
Stray capacitance between adjacent coil conductors in horizontally-wound multilayer inductors made of ferrite with a dielectric constant of about 15 hinders the improvement of high-frequency characteristics, which is a challenge in recent high-frequency applications.
Innovation Solution
A multilayer coil component design with a coil axis parallel to the mounting surface, featuring coil conductors with circumferential portions having cavities on one surface and lands with thicker cavities, reduces stray capacitance by incorporating air with a lower dielectric constant, thereby improving high-frequency characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ferrite insulating layers with dielectric constant of about 15 are used in horizontally-wound multilayer inductors, then the structure is suitable for high-frequency application, but stray capacitance between adjacent coil conductors increases and deteriorates high-frequency characteristics
Solution Approach 1:
The patent introduces air cavities within the coil conductor structure to create an effective low-dielectric constant environment. The coil conductor includes a core portion and plate portions with air spaces between them, reducing the effective dielectric constant from about 15 (ferrite) to approximately 3-5, thereby reducing stray capacitance while maintaining structural integrity
Solution Approach 2:
The patent creates a composite structure combining ferrite insulating layers with air cavities within the coil conductor. This composite approach allows the ferrite to provide magnetic properties while the air cavities reduce dielectric constant and stray capacitance, achieving both magnetic performance and low-stray-capacitance requirements
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
The design effectively reduces stray capacitance and maintains high impedance at higher frequencies, supporting improved high-frequency performance and ease of manufacturing.
Implementation Method 1
stray capacitance between adjacent coil conductors has been an obstacle to improving high-frequency characteristics
Data Source
AI summary
A multilayer coil component includes a multilayer body formed by laminating a plurality of insulating layers and having a coil therein; and first and second outer electrodes electrically connected to the coil. The coil is formed by electrically connecting a plurality of coil conductors laminated together with the insulating layers, with a via conductor passing through the insulating layers therebetween. The coil conductors each include a circumferential portion and a land connected to the via conductor. The multilayer body has first and second end surfaces facing each other in a length direction, first and second principal surfaces facing each other in a height direction orthogonal to the length direction, and first and second side surfaces facing each other in a width direction orthogonal to the length and height directions. A coil axis of the coil is parallel to the first principal surface.