Recessed Coil Component Layout for Higher SRF and Inductance
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Solution Overview
Problem
The challenge is to develop a coil component with high self-resonant frequency (SRF) and improved inductance properties while minimizing parasitic capacitance and effective volume, particularly as electronic devices require smaller sizes and higher driving frequencies.
Innovation Solution
The coil component design includes a body with a recess on one surface and external electrodes on another, with a support member and a coil having lead-out portions that extend to the recess, optimizing the distance between the coil and external electrodes to reduce parasitic capacitance and increasing the core's volume, thereby enhancing SRF and inductance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance between the coil and external electrodes is reduced to minimize parasitic capacitance, then self-resonant frequency increases, but the effective volume for inductance decreases
Solution Approach 1:
The patent introduces a recess structure that extends in the depth dimension (third direction) rather than only in the planar dimensions. By forming the recess to a specific depth and positioning external electrodes within it, the design creates additional spatial dimension for electrode placement, allowing optimization of both parasitic capacitance and effective volume simultaneously
Solution Approach 2:
The recess structure creates localized regions with different properties: the bottom region houses external electrodes to minimize parasitic capacitance, while the upper region maintains full volume for inductance. This local differentiation allows different parts of the component to serve different functions optimally
2Reliability
If a recess is formed in the body to position external electrodes, then parasitic capacitance decreases, but manufacturing complexity increases
Solution Approach 1:
The body is segmented into distinct functional zones by the recess: an upper region for inductance and a lower recessed region for external electrodes. This segmentation allows independent optimization of each zone's properties and simplifies the design process by treating them as separate but integrated components
Solution Approach 2:
The external electrodes are nested within the recess structure, with the recess forming a cavity that contains the electrodes. This nesting approach allows compact integration of multiple functional elements (body, recess, electrodes) in a hierarchical manner, reducing overall complexity
Data Source
AI summary
A coil component includes a body including a first surface and a second surface opposing each other in a first direction, a third surface and a fourth surface opposing each other in a second direction perpendicular to the first direction, and a fifth surface and a sixth surface opposing each other in a third direction perpendicular to the first direction and the second direction, and including a recess in the third surface, a support member disposed in the body, a coil disposed on the support member and including first and second lead-out portions extending to the third surface of the body, and first and second external electrodes disposed on the sixth surface of the body, extending into the recess and connected to the first and second lead-out portions, respectively.