Multi-Layer Electromagnetic Wave Attenuator for Low Frequency Shielding
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Solution Overview
Problem
Existing electromagnetic wave attenuators fail to effectively attenuate electromagnetic waves at low frequencies, particularly below 200 MHz, due to limitations in their design and materials, which affects their performance as electromagnetic shields.
Innovation Solution
The electromagnetic wave attenuator comprises multiple magnetic layers and conductive nonmagnetic layers, where the nonmagnetic layers are thinner than the magnetic layers, and the number of magnetic layers is three or more, allowing for improved attenuation through magnetostatic interactions and domain wall regions, enhancing attenuation characteristics across a wider frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electromagnetic wave attenuators are used, then they can provide basic electromagnetic shielding, but they fail to effectively attenuate electromagnetic waves at low frequencies (below 200 MHz)
Solution Approach 1:
The attenuator is divided into multiple magnetic layers (three or more) with specific thickness ratios, where each layer contributes to different aspects of electromagnetic wave attenuation. This segmentation allows the structure to effectively handle both low-frequency waves through cumulative magnetostatic interactions and higher-frequency waves through individual layer responses.
Solution Approach 2:
The patent specifies precise parameter relationships: the thickness of magnetic layers is set to be not less than 1/2 times the thickness of nonmagnetic layers, and the number of magnetic layers is three or more. These parameter changes optimize the magnetostatic interactions and domain wall regions to enhance low-frequency attenuation while maintaining overall effectiveness across a wide frequency range.
2Reliability
If the number of layers is increased to improve low-frequency attenuation, then attenuation characteristics improve, but device complexity increases
Solution Approach 1:
The attenuator employs a segmented multi-layer structure with three or more magnetic layers separated by nonmagnetic layers. This segmentation creates multiple interfaces that generate magnetostatic interactions and domain wall regions, significantly enhancing low-frequency attenuation. The specific arrangement of alternating magnetic and nonmagnetic layers provides a systematic approach to improving performance through controlled complexity.
Solution Approach 2:
The attenuator uses a composite structure combining magnetic layers and nonmagnetic layers with specific thickness relationships. This composite material approach leverages the different magnetic properties of the layers to create beneficial magnetostatic interactions and domain wall regions, achieving superior low-frequency attenuation without requiring excessive numbers of layers.
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
This configuration results in a significant reduction in transmission characteristics at low frequencies, effectively attenuating electromagnetic waves down to 200 MHz or less, improving the overall attenuation performance and electromagnetic compatibility of electronic devices.
Implementation Method 1
allowing for improved attenuation through magnetostatic interactions and domain wall regions
Implementation Method 2
allowing for improved attenuation through magnetostatic interactions and domain wall regions
Data Source
AI summary
According to one embodiment, an electromagnetic wave attenuator includes a plurality of magnetic layers, and a plurality of nonmagnetic layers. The plurality of nonmagnetic layers is conductive. A direction from one of the plurality of magnetic layers toward an other one of the plurality of magnetic layers is aligned with a first direction. One of the plurality of nonmagnetic layers is between the one of the plurality of magnetic layers and the other one of the plurality of magnetic layers. A first thickness along the first direction of the one of the plurality of magnetic layers is not less than ½ times a second thickness along the first direction of the one of the plurality of nonmagnetic layers.