Noise Suppression Sheet With Segmented Metal Layer
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Solution Overview
Problem
Existing noise suppression sheets are inadequate in achieving high noise suppression effects, particularly in the millimeter wave band, due to insufficient absorption of electromagnetic waves.
Innovation Solution
A noise suppression sheet comprising a magnetic sheet with a first metal layer having annular slits, dividing it into first and second areas, and a second metal layer on the other surface, which together absorb electromagnetic waves by repeated reflections, with the slit pattern and thickness of the magnetic sheet optimized for high attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional noise suppression sheet structure is used, then the basic noise suppression function is provided, but the noise suppression effect in the millimeter wave band is insufficient
Solution Approach 1:
The first metal layer is divided into multiple isolated island patterns arranged in an array, creating segmented conductive regions. This segmentation increases the number of interfaces between conductive and non-conductive areas, enhancing electromagnetic wave scattering and absorption in the millimeter wave band, thereby resolving the insufficient noise suppression effect.
Solution Approach 2:
The patent applies different patterns and configurations to different regions of the first metal layer. By optimizing the arrangement, size, and spacing of the island patterns locally, the structure achieves enhanced electromagnetic wave absorption at specific frequencies in the millimeter wave band while maintaining overall noise suppression functionality.
2Reliability
If the first metal layer is made continuous, then the electromagnetic wave absorption is reduced, but the structural simplicity is maintained
Solution Approach 1:
The first metal layer is segmented into discrete island patterns rather than being continuous. This segmentation creates multiple boundaries that scatter and absorb electromagnetic waves, significantly improving absorption capability in the millimeter wave band while the overall layered structure remains relatively simple to manufacture.
3Object-affected harmful factors
If the thickness of the magnetic sheet is increased, then the electromagnetic wave attenuation is improved, but the self-resonance frequency shifts and may not match the target frequency
Solution Approach 1:
The segmented island patterns in the first metal layer create multiple resonant elements with different electrical lengths and capacitances. By adjusting the number, size, and spacing of these segments, the overall self-resonance frequency of the structure can be tuned to match target frequencies in the millimeter wave band, allowing optimization of attenuation at specific frequencies without simply increasing magnetic sheet thickness.
Solution Approach 2:
The patent optimizes parameters such as the size, spacing, and arrangement of the island patterns to adjust the self-resonance frequency. By changing these geometric parameters, the structure achieves resonance at desired frequencies in the millimeter wave band, enabling frequency-specific noise suppression without relying solely on magnetic sheet thickness adjustments.
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 configuration achieves a significant attenuation of electromagnetic waves in the millimeter wave band, with the ability to adjust attenuation and self-resonance frequency through specific design parameters, resulting in a higher noise suppression effect.
Implementation Method 1
which together absorb electromagnetic waves by repeated reflections
Implementation Method 2
absorb electromagnetic waves by repeated reflections
Implementation Method 3
a magnetic sheet with a first metal layer
Data Source
AI summary
Disclosed herein is a noise suppression sheet that includes a magnetic sheet and a first metal layer provided on one surface of the magnetic sheet. The first metal layer has a plurality of annular slits. The first metal layer is divided into a plurality of first areas surrounded respectively by the plurality of slits and a second area surrounding an entire periphery of each of the plurality of slits.