Abstract
A novel and systematic procedure to design a co-polarized electromagnetic metamaterial (MM) absorber with desired outputs and resonance frequencies for dual-band WiFi signal absorption is presented. The desired resonance frequencies with expected S parameters' values were first designed as an equivalent circuit with extensive analysis and then implemented into frequency-selective MM absorber by numerical simulation with precise LRC elements, satisfying least unit cell area (0.08λ), substrate thickness (0.01λ) and maximum effective medium ratio (12.49). The absorber was simulated for the maximum angle of incidence for both the normal and oblique incidences at co-polarization. The absorptions at the desired resonance frequencies were found at a satisfactory level by both simulation and practical measurement along with a single negative value to ensure metamaterial characteristics. The proposed equivalent circuit analysis approach can help researchers design and engineering co-polarization insensitive MM absorbers using conventional split-ring resonators, with perfection in output and desired resonance frequencies without the necessity of lumped elements or multilayer substrates. The proposed metamaterial can be utilized for SAR reduction, crowdsensing, and other WiFi-related practical applications.
Highlights
A novel and systematic procedure to design a co-polarized electromagnetic metamaterial (MM) absorber with desired outputs and resonance frequencies for dual-band WiFi signal absorption is presented
This paper proposes a systematic method to design a co-polarization insensitive metamaterial absorber with desired S parameters and resonance frequencies for WiFi signal (2.4 GHz and 5 GHz) absorption with extensive equivalent circuit analysis
The polarization insensitivity was proved for this design up to 180 degrees of applied EM waves’ incident angle, which is unprecedented among similar absorbers to date
Summary
A novel and systematic procedure to design a co-polarized electromagnetic metamaterial (MM) absorber with desired outputs and resonance frequencies for dual-band WiFi signal absorption is presented. It seems apparent that there must be some technique and proper explanation to design a MM absorber at desired frequencies with desired values of S parameters, which can be explained logically To date, no such works are found that can logically explain the patch structure for having its resonance frequencies or S parameters (which can explain SNG or DNG properties; as a result, the MM characteristics), Scientific Reports | (2021) 11:13791. There must be a logical and systematic process to design co-polar MM absorbers with target resonances and desired S parameters values so that the MM characteristic can be correlated with the patch design. Few articles have been published describing equivalent circuit analysis for better interpretation of the designed a bsorber[16,17,18,19,20,21,22,23,24,25,26], but no papers are found for WiFi signal absorber with necessary equivalent circuit analysis
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