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Tessellation-Enabled Hexagonal Hollow-Shell Cavity Arrays for Broadband Microwave Absorption via
Shaokang Liu1,2, Weicheng Liao1,2, Pinchen Luo1,2
1College of Mechanical and Electrical Engineering, Central South University, Changsha, P. R. China.
Small Methods
|July 17, 2026
Summary
We developed a novel hollow-shell cavity absorber using a physics-based framework for designing lightweight polymer composites. This approach optimizes broadband microwave absorption by controlling electromagnetic coupling and confinement.
Area of Science:
- Materials Science
- Electromagnetics
- Acoustics
Background:
- Broadband microwave absorption in lightweight polymer composites faces challenges with attenuation, impedance matching, and wave propagation.
- Existing designs often struggle to balance these coupled requirements effectively.
Purpose of the Study:
- To propose a novel dense-stacked polygonal hollow-shell cavity absorber.
- To establish an acoustic-to-electromagnetic cavity mapping framework for absorber design.
- To advance structural absorber design toward a topology-driven approach.
Main Methods:
- Developed a framework based on transferable wave-governing principles (impedance discontinuity, phase accumulation, effective propagation length, cavity confinement).
- Reinterpreted tessellation as an electromagnetic coupling mechanism to suppress leakage and enhance confinement.
- Screened carbon-black-filled PLA/TPU composites, identifying CB5 as optimal for attenuation and impedance matching.
- Compared triangular, quadrilateral, and hexagonal cavity topologies, selecting hexagonal for superior performance.
Main Results:
- The optimized hexagonal hollow-shell array demonstrated superior broadband microwave absorption.
- Effective performance was maintained under oblique incidence.
- Reduced radar scattering was achieved with the novel design.
Conclusions:
- The proposed acoustic-to-electromagnetic mapping framework provides a physically interpretable route for designing advanced structural absorbers.
- Hexagonal topology and optimized composite formulations lead to enhanced microwave absorption properties.
- This work shifts absorber design from empirical methods to a topology-driven strategy.
