Hexagonal Double-Layer Wave Absorber for Broadband Curved Surfaces
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Solution Overview
Problem
Conventional metamaterial absorbers face limitations in achieving perfect electromagnetic wave absorption, particularly in three-dimensional corner structures and curved shapes, and have restricted bandwidth due to the requirement of periodic arrangement of conductive patterns, and single-layer absorbers struggle to expand absorption bandwidth.
Innovation Solution
An ultra-wideband electromagnetic wave absorber with a hexagonal double-layer structure is developed, utilizing two conductive patterns with hexagonal and rhombic tiles, where the first conductive pattern has a higher sheet resistance than the second, and both patterns are arranged axially symmetrically, allowing for periodic arrangement on complex shapes and reducing unit cell size and thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single-layer conductive patterns are used, then the structure is simple, but the absorption bandwidth is limited
Solution Approach 1:
The patent transitions from a single-layer structure to a double-layer structure, adding a vertical dimension to the design. The first conductive pattern is positioned on the first dielectric layer while the second conductive pattern is positioned on the second dielectric layer, creating a three-dimensional electromagnetic wave absorption system that expands the absorption bandwidth through multi-layer interference effects
Solution Approach 2:
The patent employs composite material structures by combining multiple dielectric layers with different properties and multiple conductive patterns with varying sheet resistances. The first dielectric layer and second dielectric layer are stacked with conductive patterns at different positions, creating a composite structure that achieves broadband absorption through the synergistic effects of different material properties
2Reliability
If square unit cells with periodic arrangement are used, then perfect absorption is achieved, but application to curved surfaces and three-dimensional corner structures is difficult
Solution Approach 1:
The patent replaces the conventional square unit cell with a hexagonal unit cell structure. The hexagonal shape provides six-fold symmetry that allows for better adaptation to curved surfaces and three-dimensional corner structures while maintaining periodic arrangement benefits. The hexagonal geometry enables flexible deployment on complex geometries without compromising the periodicity required for effective electromagnetic wave absorption
Solution Approach 2:
The hexagonal unit cell design serves multiple functions: it maintains the periodic arrangement necessary for perfect absorption, adapts to curved surfaces and three-dimensional structures, and provides a versatile platform for various absorption applications. This universal design approach allows the same structural pattern to be effectively applied across different geometries and deployment scenarios
3Loss of energy
If conventional absorber materials are used, then magnetic hysteresis loss or resistance loss is achieved, but the absorber is heavy and thick
Solution Approach 1:
The patent changes the fundamental parameters of the absorber design by using thin dielectric layers instead of thick magnetic materials, and by employing conductive patterns with optimized sheet resistances rather than bulk resistive materials. This parameter transformation enables achieving effective electromagnetic wave loss through a much thinner and lighter structure
Solution Approach 2:
The patent substitutes mechanical bulk materials (such as ferrite and carbon composites) with a planar metamaterial structure consisting of thin dielectric layers and conductive patterns. This replacement eliminates the need for thick, heavy materials while achieving comparable or superior energy loss through the engineered electromagnetic response of the patterned structure
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 solution achieves a significantly expanded bandwidth, reduced reflectance, and lightweight design, enabling efficient absorption of ultra-wideband radar signals, suitable for stealth applications in mobile weapon systems, with a relative bandwidth of 169.5% and reflectance below -10 dB in the 1 to 12.1 GHz range.
Implementation Method 1
Metamaterial absorbers can dramatically lower electromagnetic wave reflectance not only by using impedance matching with air, but also by using the high ohmic loss occurring in the pattern
Implementation Method 2
Metamaterial absorbers can dramatically lower electromagnetic wave reflectance not only by using impedance matching with air
Data Source
AI summary
The provided is an ultra-wideband electromagnetic wave absorber having a hexagonal double layer structure, and in the ultra-wideband electromagnetic wave absorber, the first conductive pattern disposed on the top of the first dielectric layer and the second conductive pattern disposed on the top of the second dielectric layer are arranged in an up-down double layer structure, thereby expanding the electromagnetic wave absorption bandwidth, and even when applied to a corner or a curved structure forming 60° or 120° by hexagonal unit cells, the unit cells can be periodically arranged at the same interval. In addition, since dielectrics with a difference of less than 10% in dielectric constant in a vacuum state have a relatively low specific gravity, the overall weight can be made very light by using such dielectrics in the first dielectric layer and the second dielectric layer.