Angle-insensitive co-polarized metamaterial absorber based on equivalent circuit analysis for dual band WiFi applications

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.

Machine learning-based technique for resonance and directivity prediction of UMTS LTE band quasi Yagi antenna

“…11 (d). [28] , [29] . In the final step, a simulation is performed using the R L C parameters to cover the complete frequency range using the equivalent circuit model of the proposed antenna, as shown in Fig.…”

A co-polarization-insensitive metamaterial absorber for 5G n78 mobile devices at 3.5 GHz to reduce the specific absorption rate

“…3 ) were calculated using the following Eqs. 16 . where is the inductance per unit length of the microstrip , l is the length of the strip (inches), W is the width of the strip (inches), and D is the distance between the stripline and the ground plane.…”

“…Frequency-targeted antennas are common, but frequency-targeted MMAs are rare to find. To design a specific frequency targeted MMA, some factors (L, R & C components) must be considered 16 . The absorber must have a resonating patch with an inductance value associated with the necessary resistance value for required S parameters (S 11 mainly) and the corresponding capacitive value.…”

Focusing on the Development and Current Status of Metamaterial Absorber by Bibliometric Analysis

“…Only a few metamaterial absorbers (with conventional substrate and copper patch) have been proposed that are designed at some targeted frequencies for real world application. Some metamaterial absorbers have been proposed with a rotational symmetric patch structure to enable cross-polarization insensitivity, along with the conventional co-polarization absorption of the incident waves at resonance frequencies [ 28 ]. Along with its many other applications, SAR reduction from the next generation mobile phones is a recent application of frequency-targeted metamaterial absorbers [ 29 ].…”