Flexible Metamaterial Absorber Cell for Wide-Angle Broadband Absorption

The patent introduces asymmetric split-ring resonators where the inner and outer rings have different radii (inner radius 3mm, outer radius 5mm), creating asymmetric electromagnetic response that improves absorbance consistency across different incident angles. The asymmetric geometry allows the structure to interact more uniformly with electromagnetic waves regardless of their direction of incidence.

The patent transitions from conventional two-dimensional planar metamaterial structures to three-dimensional hierarchical structures by stacking multiple layers (bottom layer with split-ring resonators, middle layer with conductive patterns, top layer with additional resonators) separated by dielectric spacers. This vertical dimensionality addition creates omnidirectional electromagnetic interaction, maintaining high absorbance across a wide range of incident angles from 0° to 60°.

The patent divides the absorber into multiple functional layers, each contributing to different frequency ranges. The bottom layer with split-ring resonators targets lower frequencies, while the top layer with additional resonators extends coverage to higher frequencies. This segmentation allows the overall structure to achieve broadband absorption from 8 GHz to 12 GHz by combining the resonant responses of individual layers.

The patent employs composite material structures combining different metamaterial elements (split-ring resonators, conductive patterns, dielectric spacers with specific permittivity values) to achieve broadband electromagnetic absorption. The composite design enables simultaneous resonance at multiple frequencies, expanding the operating bandwidth while maintaining high absorbance across the entire 8-12 GHz range.

The patent implements an ultra-thin absorber structure with total thickness of only 3mm, utilizing flexible printed circuit board (PCB) technology and thin dielectric spacers. The metamaterial patterns are fabricated as thin conductive traces on flexible substrates, replacing bulky conventional absorber materials. This thin-film approach maintains high electromagnetic wave absorption while dramatically reducing weight and enabling flexible deployment applications.

The patent replaces heavy mixed materials (such as ferrite materials) with lightweight metamaterial structures fabricated using printed circuit board technology. The electromagnetic absorption function is achieved through carefully designed conductive patterns and resonant structures rather than through the mass and magnetic properties of bulky materials. This substitution reduces both weight and manufacturing cost while maintaining absorption performance.