Ultrabroadband and wide-angle hollow 3D electromagnetic absorbing material enabled by dual absorption mechanisms and impedance optimization design

Abstract

This study introduces an ultrabroadband, low-profile hollow three-dimensional absorbing material (HTDA) with wide-angle performance. The HTDA is fabricated from poly lactic acid-carbon fiber and incorporates five resistive frequency-selective surfaces (RFSSs). This design enables dielectric loss through the 3D structure and resonance loss via the RFSSs. To achieve ultrabroadband absorption and enhance oblique incidence performance, the RFSSs and the equivalent dielectric constant of the 3D structure were optimized. Metal patches on the sides further improve the oblique incidence performance. Simulation results show that the HTDA, with a total thickness of 0.134λ_L and periodicity of 0.343λ_L (wavelength at the lowest absorption frequency), achieves a −10 dB absorption band from 6.5 to 40.0 GHz (147.1% fractional bandwidth). The absorber maintains effective performance at oblique incidence angles up to 45° for TE polarization and 70° for TM polarization. Both the simulation and experimental results confirm the effectiveness of the design.

Keywords

3-D absorbing material / dual absorption mechanisms / ultrabroadband / wide-angle / impedance optimization design

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Central South University