Interaction Between Closely Packed Array Antenna Elements Using Metasurface for Applications Such as MIMO Systems and Synthetic Aperture Radars

Alibakhshikenari, Mohammad, Virdee, Bal Singh, Shukla, Pancham, See, Chan, Abd-Alhameed, Raed, 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. pp. 1-15.

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Official URL: https://agupubs.onlinelibrary.wiley.com/doi/10.102...

Abstract / Description

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 (MTM-DS), 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 E-shaped 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 λo 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
Uncontrolled Keywords: metamaterial decoupling slab (MTM-DS), antenna arrays, frequency beam-scanning, synthetic aperture radars (SAR), multiple-input multiple-output (MIMO) systems
Subjects: 600 Technology
600 Technology > 620 Engineering & allied operations
Department: School of Computing and Digital Media
Depositing User: Bal Virdee
Date Deposited: 22 Oct 2018 08:46
Last Modified: 22 Oct 2018 08:46
URI: http://repository.londonmet.ac.uk/id/eprint/3546

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