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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

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Small-Size Eight-Element MIMO Metamaterial Antenna with High Isolation Using Modal Significance Method.

Tirado-Mendez Jose Alfredo¹, Jardon-Aguilar Hildeberto², Flores-Leal Ruben²

¹Instituto Politécnico Nacional, Electrical Engineering Department, SEPI-ESIME-Zacatenco, Av. IPN S/N, Edif. 5., Ciudad de México 07300, Mexico.

Sensors (Basel, Switzerland)

|October 16, 2024

Summary

This summary is machine-generated.

This study introduces a compact, eight-element MIMO antenna array for 5G NR bands, achieving over 20 dB isolation using metamaterial resonators and electromagnetic barriers. The design offers significant size reduction and excellent performance for mobile applications.

Keywords:

8-elements MIMO antenna metamaterial octagonal SRR small size

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Area of Science:

Electrical Engineering
Electromagnetics
Metamaterials

Background:

Modern wireless communication systems, particularly 5G New Radio (NR), demand antenna arrays with high performance and miniaturization.
Achieving high electromagnetic isolation in closely spaced antenna elements is a significant challenge in Multiple-Input Multiple-Output (MIMO) systems.

Purpose of the Study:

To design and validate a symmetrical, reduced-size eight-element MIMO antenna array for n77 and n78 NR bands.
To enhance electromagnetic isolation between closely packed antenna elements.
To achieve significant size reduction compared to conventional antenna designs.

Main Methods:

Utilized an octagonal double-negative metamaterial split-ring resonator (SRR) for radiator size reduction.
Employed the modal significance (MS) method to analyze electromagnetic coupling.
Implemented electromagnetic barriers using strip lines to mitigate coupling effects.

Main Results:

Achieved over 50% size reduction in radiators using SRR metamaterials.
Attained isolation exceeding 20 dB for adjacent and 40 dB for opposite elements.
Demonstrated excellent MIMO performance with envelope correlation coefficient (ECC) < 0.0001 and diversity gain (DG) ≈ 20 dB.

Conclusions:

The proposed symmetrical, reduced-size eight-element MIMO antenna array effectively addresses the need for compact and high-performance antennas in 5G NR.
The integration of metamaterial SRRs and electromagnetic barriers provides a viable solution for enhancing isolation in dense antenna arrays.
The array's small footprint (0.32 λ^2 at 3.5 GHz) and superior performance metrics make it suitable for advanced MIMO applications.