EM Radiation Absorber With Irregular Conductive Fill for Broadband Shielding
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Solution Overview
Problem
Existing absorption technologies for electromagnetic radiation in the frequency range of 500 MHz to 15 GHz, such as pyramid absorbers and ferrite tiles, are either too voluminous, heavy, or limited in frequency range and directional effectiveness for practical applications like room lining.
Innovation Solution
A cuboid-shaped absorption device with irregularly arranged absorption elements featuring a carrier body of electrically insulating material coated with an electrically conductive layer, inducing lossy currents and scattering electromagnetic radiation, and a housing design that allows for high transmissivity and partial reflection to enhance absorption across different frequencies and angles of incidence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pyramid absorbers with cone length of at least 30-40 cm are used to absorb GSM 900 frequencies, then absorption efficiency is improved, but volume becomes too large for practical room lining
Solution Approach 1:
The patent divides the absorption function into multiple small planar absorption elements (e.g., 2-10 cm size) distributed across a large surface area, replacing the single large pyramid structure. These segmented elements collectively provide the same absorption efficiency while maintaining a compact overall volume suitable for room lining.
Solution Approach 2:
The patent transitions from three-dimensional pyramid structures to two-dimensional planar elements arranged on surfaces. By distributing absorption elements across the wall surface area rather than using deep volumetric structures, the solution achieves equivalent absorption performance with dramatically reduced volume occupation.
2Reliability
If ferrite tiles are used to damp magnetic fields in a broad frequency range, then absorption effectiveness is improved, but weight becomes too high for practical installation
Solution Approach 1:
The patent changes the material parameters by using lightweight dielectric materials with appropriate permittivity and conductivity characteristics instead of heavy ferrite materials. By optimizing the electrical parameters (conductivity, permittivity) of thin coating layers, the system achieves broad frequency absorption with dramatically reduced weight.
Solution Approach 2:
The patent employs composite structures combining dielectric carrier bodies with conductive coating layers. This composite approach enables tuning of electromagnetic properties to achieve broad frequency absorption while maintaining low weight, replacing solid ferrite tiles with lightweight multi-layer composites.
3Reliability
If multiple absorbing surfaces are arranged at quarter-wave distance for a special frequency, then elimination of electromagnetic waves is improved, but the solution becomes limited to vertically incident waves and specific frequencies
Solution Approach 1:
The patent designs planar absorption elements that simultaneously handle multiple frequencies and incident angles through their distributed arrangement and optimized impedance characteristics. Each element contributes to absorption across a broad spectrum, making the system universally effective for various GSM frequencies and wave directions without requiring frequency-specific tuning.
Solution Approach 2:
The patent varies the local properties of absorption elements (size, conductivity, positioning) across the surface to create a distributed system that handles different incident angles and frequencies. By optimizing local element characteristics rather than using uniform quarter-wave structures, the system achieves adaptability to diverse electromagnetic conditions.
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 absorption device effectively absorbs electromagnetic radiation across a broad frequency range, including GSM frequencies, with reduced size and weight, and improved directional absorption, reducing radiation exposure in living spaces.
Implementation Method 1
Lossy electric currents can be induced in the electrically conductive layers of the absorption elements by electromagnetic radiation incident on the absorption device
Implementation Method 2
Lossy electric currents can be induced in the electrically conductive layers of the absorption elements by electromagnetic radiation incident on the absorption device
Implementation Method 3
Scattering of incident electromagnetic radiation occurs due to the different orientations of the absorption elements
Data Source
AI summary
An absorption device for absorbing electromagnetic radiation at least in a partial range within a frequency range from 500 MHz to 15 GHz includes a housing (1), which is at least partially transmissive to the electromagnetic radiation to be absorbed and has an inner receptacle space (3), which contains a fill, which includes irregularly arranged absorption elements (4). The absorption elements each include a carrier body (4a) made of an electrically insulating material, on which a layer (4b) is applied externally at least on one side, which is formed by an electrically conductive material.