Ultra-wideband polarization- and angle-insensitive metamaterial absorber based on multilayer resistive ink

Abstract

An ultra-wideband metamaterial absorber (MA) consisting of three layers of resistive ink separated by two layers of polymethacrylimide is proposed. The results of full-wave simulation show that the absorptivity is high up to 95% with a bandwidth ratio of 1:9.73 over the wide frequency range from 4.20 to 40.87 GHz, covering the whole C, X, Ku, K, and Ka bands. Moreover, the MA is insensitive to polarization and exhibits wide-angle stability, which is investigated by the full-wave simulation results as well as the analysis of multi-reflection interference theory. The fabricated prototype with a single unit cell of 0.081 g is tested using free-space measurement in an anechoic chamber, and the measured results are in good agreement with the simulation results, which prove the robustness of the design and indicates a practical application prospect of the proposed ultra-wideband MA with lightweight, simple, and compact structure.

KEYWORDS:

• Ultra-wideband
• metamaterial absorber
• resistive ink
• polarization-insensitive
• angle-insensitive

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work is supported by the China Post-Doctoral Science Foundation [grant number 2020M671834]; the Fundamental Research Funds for the Central Universities of China [grant number JD2020JGPY0010].