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Interaction between closely packed array antenna elements using metasurface for applications such as MIMO systems and synthetic aperture radars
Alibakhshikenari, M. Virdee, B.S. Shukla, P. See, C.H. Khalily, M. Falcone, F. Limiti, E.
Alibakhshikenari, M.
Virdee, B.S.
Shukla, P.
See, C.H.
Khalily, M.
Falcone, F.
Limiti, E.
Publication Date
2018-11
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(c) 2018 American Geophysical Union. Alibakhshikenari et al (2018) Interaction between closely packed array antenna elements using metasurface for applications such as MIMO systems and synthetic aperture radars. Radio Science. 53(11). https://doi.org/10.1029/2018RS006533.
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openAccess
Accepted for publication
2018-10-12
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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.
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Accepted manuscript
Citation
Alibakhshikenari M, Virdee BS, Shukla P et al (2018) Interaction between closely packed array antenna elements using metasurface for applications such as MIMO systems and synthetic aperture radars. Radio Science. 53(11): 1368-1381.
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Article