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Isolation enhancement of metamaterial structure MIMO antenna for WiMAX/WLAN/ITU band applications

Published online by Cambridge University Press:  06 January 2022

Pasumarthi Suneetha Open the ORCID record for Pasumarthi Suneetha [Opens in a new window] ,
Kethavathu Srinivasa Naik Open the ORCID record for Kethavathu Srinivasa Naik [Opens in a new window]  and
Pachiyannan Muthusamy Open the ORCID record for Pachiyannan Muthusamy [Opens in a new window]
Pasumarthi Suneetha*
Affiliation:
Department of Electronics and Communication Engineering, Advanced Antenna Design Laboratory, Vignan's Institute of Information Technology (A), Visakhapatnam, Andhra Pradesh, India
Kethavathu Srinivasa Naik
Affiliation:
Department of Electronics and Communication Engineering, Advanced Antenna Design Laboratory, Vignan's Institute of Information Technology (A), Visakhapatnam, Andhra Pradesh, India
Pachiyannan Muthusamy
Affiliation:
Department of Electronics and Communication Engineering, Advanced RF Microwave & Wireless Communication Laboratory, Vignan's Foundation for Science Technology and Research (Deemed to be University), Guntur, Andhra Pradesh, India
*
Author for correspondence: Pasumarthi Suneetha, E-mail: rsss4m@gmail.com
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Abstract

The μ-negative metamaterial (MNG) two-element MIMO antenna design was proposed in this article for WiMAX (2.5–2.8 GHz), WLAN (3.2–5.9 GHz), and ITU band (8.15−8.25 GHz) applications. The first design of the MIMO antenna operates at 2.7 and 4.9 GHz frequencies. In order to reduce the mutual coupling, a defective ground structure is used. For further isolation improvement, an MNG unit cell is placed in between the two radiating elements at a distance of 10 mm. The designed antenna elements have better than −23 dB coupling isolation between the two radiating elements. Moreover, with MNG an additional frequency of 8.2 GHz is obtained, which is useful for ITU band applications. The proposed antenna bandwidth is expanded by 19% in the lower operational band, 20% in the second operational band, and 32% in the higher frequency band with the MNG unit cell. From the analysis, the proposed antenna is suitable for WiMAX/WLAN/ITU band applications because of its low enveloped correlation coefficient, and highest directive gain and low mutual coupling between the radiating components. The proposed antenna was simulated, fabricated, and measured with the help of the Schwarz ZVL vector network analyzer and anechoic chamber. Both measured and simulated results are highly accurate and highly recommended for WiMAX/WLAN/ITU bands.

Keywords

DGDGSECCmetamaterial unit cellMIMO antenna
Type
Metamaterials and Photonic Bandgap Structures
Information
International Journal of Microwave and Wireless Technologies , Volume 14 , Issue 10 , December 2022 , pp. 1315 - 1325
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Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press in association with the European Microwave Association

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