Optimal parameter retrieval for metamaterial absorbers using the least-square method for wide incidence angle...

Area of Science:

• Electromagnetics and Metamaterials
• Computational Physics
• Materials Science

Background:

• Metamaterial absorbers offer unique electromagnetic properties.
• Achieving angle-insensitivity is crucial for practical applications.
• Existing design methods can be computationally intensive.

Purpose of the Study:

• To develop and validate a novel algorithm for predicting the incidence angle insensitivity of metamaterial absorbers.
• To simplify the design process for angle-insensitive metamaterial devices.
• To demonstrate the algorithm's effectiveness on a specific metamaterial absorber design.

Main Methods:

• A least-square method-based algorithm was proposed.
• Equivalent circuit parameters (inductance, capacitance, conductance) were retrieved.
• Analysis was performed at various incidence angles (0°, 30°, 65°, 70°) and polarizations (TE, TM).
• Complex impedances were calculated and compared with full-wave simulations.

Main Results:

• The proposed algorithm accurately predicted the incidence angle insensitivity.
• Excellent agreement was observed between calculated and simulated complex impedances.
• The algorithm demonstrated reliability across different incidence angles and polarizations.

Conclusions:

• The developed least-square method algorithm is effective for predicting angle-insensitive metamaterial absorber performance.
• This approach facilitates the design of robust metamaterial absorbers.
• The findings contribute to the advancement of metamaterial-based electromagnetic devices.