Multilayer Coil Component for 60 GHz RF Applications
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Solution Overview
Problem
Existing multilayer coil components do not exhibit satisfactory radio-frequency characteristics at frequencies greater than or equal to 60 GHz, which is a requirement due to increasing communication speeds and miniaturization of electronic devices.
Innovation Solution
A multilayer coil component is designed with a coil built into a multilayer body formed by stacking insulating layers and coil conductors, where the stacking direction and coil axis are parallel to the mounting surface, with specific dimensions and electrode configurations to optimize radio-frequency performance, including a distance between adjacent coil conductors ranging from 12 μm to 40 μm and a coil conductor arrangement length of 85% to 95% of the multilayer body length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coil component uses conventional结构设计 with higher glass content in the middle part, then it achieves good characteristics at around 10 GHz, but it cannot provide satisfactory radio-frequency characteristics at frequencies greater than or equal to 60 GHz
Solution Approach 1:
The patent changes the physical parameters of the coil structure by controlling the distance between adjacent coil conductors to be 12 μm to 40 μm and setting the coil conductor arrangement length to 85% to 95% of the multilayer body length. This parameter optimization enables the component to achieve excellent radio-frequency characteristics at 60 GHz and higher frequencies, resolving the frequency band adaptability limitation of conventional designs
Solution Approach 2:
The patent employs a composite structure combining multiple insulating layers with specific dielectric properties and coil conductors arranged in a optimized configuration. This composite design, with the coil built into the multilayer body and specific spacing between conductors, creates a structure that maintains stable electrical characteristics across high frequency bands, enabling both reliability and frequency adaptability
2Reliability
If the distance between coil conductors is reduced to increase inductance, then high inductance is maintained, but stray capacitances increase which degrades radio-frequency characteristics at high frequencies
Solution Approach 1:
The patent optimizes the distance parameter between adjacent coil conductors to fall within 12 μm to 40 μm, and sets the coil conductor arrangement length to 85% to 95% of the multilayer body length. This precise parameter control achieves an optimal balance where sufficient inductance is maintained while stray capacitance is kept low enough to support excellent radio-frequency characteristics at 60 GHz and above
Solution Approach 2:
The patent transitions from conventional planar coil arrangements to a three-dimensional multilayer structure with the coil built into the multilayer body. By stacking insulating layers and coil conductors in multiple dimensions with specific spacing, the design achieves high inductance through increased path length while maintaining small conductor distances that reduce parasitic effects, thereby supporting high-frequency operation
Data Source
AI summary
A multilayer coil component includes a multilayer body formed by stacking a plurality of insulating layers in a length direction and that has a built-in coil, and a first outer electrode and a second outer electrode that are electrically connected to the coil. The coil is formed by a plurality of coil conductors stacked in the length direction being electrically connected to each other. The first and second outer electrodes respectively cover at least parts of first and second end surfaces. A stacking direction and a coil axis direction are parallel to the first main surface. A length of a region in which the coil conductors are arranged in the stacking direction is from 85% to 95% of a length of the multilayer body. A distance between coil conductors adjacent to each other in the stacking direction lies in a range from 12 μm to 40 μm.