Metamaterial Based Design of Compact UWB/MIMO Monopoles Antenna with Characteristic Mode Analysis
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Date
2021-02-08
Authors
Jabire, Adamu Halilu
Adnan, Ghaffar
Xue, Jun Li
Abdu, Anas
Saminu, Sani
Alibakhshikenari, Mohammad
Falcone, Francisco
Limiti, Ernesto
Journal Title
Journal ISSN
Volume Title
Publisher
MDPI
Abstract
In this article, a novel metamaterial inspired UWB/multiple-input-multiple-output (MIMO)
antenna is presented. The proposed antenna consists of a circular metallic part which formed the
patch and a partial ground plane. Metamaterial structure is loaded at the top side of the patches
for bandwidth improvement and mutual coupling reduction. The proposed antenna provides
UWB mode of operation from 2.6–12 GHz. The characteristic mode theory is applied to examine
each physical mode of the antenna aperture and access its many physical parameters without
exciting the antenna. Mode 2 was the dominant mode among the three modes used. Considering
the almost inevitable presence of mutual coupling effects within compact multiport antennas, we
developed an additional decoupling technique in the form of perturbed stubs, which leads to a
mutual coupling reduction of less than 20 dB. Finally, different performance parameters of the system,
such as envelope correlation coefficient (ECC), channel capacity loss (CCL), diversity gain, total active
reflection coefficient (TARC), mean effective gain (MEG), surface current, and radiation pattern, are
presented. A prototype antenna is fabricated and measured for validation.
Description
Keywords
metamaterials, mutual coupling, multiple input multiple output, characteristic modes