Multilayer Coil Composition for Low Loss at 60 GHz
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Solution Overview
Problem
Multilayer coil components using ferrite materials experience significant loss at higher frequency bands, particularly around 60 GHz, due to high relative dielectric constants, which limits their high-frequency characteristics.
Innovation Solution
Incorporating a non-magnetic phase with a lower dielectric constant into the insulating layers, in addition to the ferrite phase, to reduce dielectric constant and loss, while maintaining structural integrity and high-frequency performance up to 60 GHz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ferrite material is used as the insulating layer material, then the multilayer coil component has good magnetic properties and structural stability, but the loss increases significantly in the frequency range around 60 GHz due to high relative dielectric constant
Solution Approach 1:
The patent applies composite materials by combining ferrite material with glass material in the insulating layers. This composite structure allows the component to maintain magnetic properties from the ferrite phase while the glass material contributes lower dielectric constant and reduced loss in the 60 GHz frequency range, thereby resolving the contradiction between magnetic performance and high-frequency loss
Solution Approach 2:
The patent changes the material composition parameters by controlling the content ratio of ferrite material to glass material in the insulating layers. By adjusting these parameters, the component achieves optimal balance between magnetic properties and dielectric characteristics, enabling satisfactory performance up to 60 GHz frequency range
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 multilayer coil component achieves a transmission coefficient of −1.0 dB or higher from 1 GHz to 40 GHz and −1.5 dB or higher from 40 GHz to 60 GHz, enhancing its suitability for high-frequency applications without compromising strength.
Implementation Method 1
Ferrite materials have a high relative dielectric constant of around 15 and therefore a multilayer coil component that uses a ferrite material has large loss in a region around a frequency of 60 GHz
Data Source
AI summary
A multilayer coil component includes a multilayer body in which a plurality of insulating layers are stacked and inside of which a coil is provided, and first and second outer electrodes provided on surfaces of the multilayer body and electrically connected to the coil. The multilayer body has first and second end surfaces, first and second main surfaces, and first and second side surfaces. The first outer electrode extends from at least part of the first end surface of the multilayer body across part of the first main surface and the second outer electrode extends from at least part of the second end surface of the multilayer body across part of the first main surface. A transmission coefficient S21 is −1.0 dB or higher in a range from 1 GHz to 40 GHz and is −1.5 dB or higher in a range from 40 GHz to 60 GHz.