Broadband metasurface absorber based on involute structure and surface plasmon resonance

Area of Science:

• Electromagnetics and Metamaterials
• Plasmonics
• Microwave Engineering

Background:

• Conventional wave absorbers suffer from bulky volumes and limited absorption efficiency.
• Metasurface absorbers offer reduced thickness and enhanced absorption but typically exhibit narrowband characteristics, limiting practical applications.

Purpose of the Study:

• To propose a novel metasurface structure capable of generating multiple localized surface plasmon resonances (LSPR) for broadband absorption.
• To design an ultrathin metasurface absorber with enhanced absorption bandwidth and stability against polarization and incidence angles.

Main Methods:

• Utilizing a geometric involute-inspired metasurface design.
• Conducting electromagnetic simulations to analyze resonance behavior and absorption performance.
• Fabricating and experimentally validating the proposed metasurface absorber.

Main Results:

• Achieved an absorption bandwidth of 20-28.2 GHz with absorption efficiency exceeding 10 dB.
• Demonstrated an ultrathin profile of 1.67 mm, approximately one-ninth of the wavelength at the lowest operating frequency.
• Confirmed stable absorption performance for polarization angles up to 50° and incidence angles up to 60°.

Conclusions:

• The proposed metasurface absorber effectively broadens absorption bandwidth through multiple LSPR.
• The design offers ultrathin characteristics and robust performance under varying polarization and incidence angles.
• Presents a novel solution for developing high-performance, broadband electromagnetic wave absorbers.