Interaction between closely packed array antenna elements using metasurface for applications such as MIMO systems and Synthetic Aperture Radars

Alibakhshikenari, Mohammad, Virdee, Bal S., Shukla, Panchamkumar, See, Chan ORCID: 0000-0001-8439-7321, Abd-Alhameed, Raed, Khalily, Mohsen, Falcone, Francisco and Limiti, Ernesto (2018) Interaction between closely packed array antenna elements using metasurface for applications such as MIMO systems and Synthetic Aperture Radars. Radio Science, 53 (11). pp. 1368-1381. ISSN 0048-6604

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Abstract

The paper presents a technique to enhance the isolation between adjacent radiating elements which is common in densely packed antenna arrays. Such antennas provide frequency beam-scanning capability needed in Multiple-Input Multiple-Output (MIMO) systems and Synthetic Aperture Radars (SARs). The method proposed here uses a metamaterial decoupling slab (MTMDS), which is located between radiating elements, to suppress mutual-coupling between the elements that would otherwise degrade the antenna efficiency and performance in both the transmit and receive mode. The proposed MTM-DS consists of mirror imaged Eshaped slits engraved on a microstrip patch with inductive stub. Measured results confirm over 9–11 GHz with no MTM-DS the average isolation (S12) is -27 dB; however, with MTM-DS the average isolation improves to -38 dB. With this technique the separation between the radiating element can be reduced to 0.66λo, where λ0 is free space wavelength at 10 GHz. In addition, with this technique there is 15% improvement in operating bandwidth. At frequencies of high impedance match of 9.95 GHz and 10.63 GHz the gain is 4.52 dBi and 5.40 dBi, respectively. Furthermore, the technique eliminates poor front-to-back ratio encountered in other decoupling methods. MTM-DS is also relatively simple to implement. Assuming adequate space is available between adjacent radiators the MTM-DS can be fixed retrospectively on existing antenna arrays, which makes the proposed method versatile.

Item Type: Article
Additional Information: Authors accepted version accepted for publication in Radio Science.Copyright (2018) American Geophysical Union. Further reproduction or electronic distribution is not permitted
Uncontrolled Keywords: Metamaterial decoupling slab (MTM-DS), antenna arrays, frequency beam-scanning, synthetic aperture radars (SAR), multiple-input multiple-output (MIMO) systems
Divisions: Engineering, Sports and Sciences > Engineering
Depositing User: Tracey Gill
Date Deposited: 15 Oct 2018 14:46
Last Modified: 19 Jan 2019 09:15
Identification Number: 10.1029/2018RS006533
URI: http://ubir.bolton.ac.uk/id/eprint/1996

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