Surface Wave Reduction in Antenna Arrays Using Metasurface Inclusion for MIMO and SAR Systems

Alibakhshikenari, Mohammad; Virdee, Bal S.; See, Chan Hwang; Abd-Alhameed, Raed A.; Falcone, Francisco; Limiti, Ernesto

doi:10.1029/2019RS006871

Surface Wave Reduction in Antenna Arrays Using Metasurface Inclusion for MIMO and SAR Systems

Alibakhshikenari, Mohammad; Virdee, Bal S.; See, Chan Hwang; Abd-Alhameed, Raed A.; Falcone, Francisco; Limiti, Ernesto

Authors

Mohammad Alibakhshikenari

Bal S. Virdee

Dr Chan Hwang See C.See@napier.ac.uk
Associate Professor

Raed A. Abd-Alhameed

Francisco Falcone

Ernesto Limiti

Abstract

An effective method is presented for suppressing mutual coupling between adjacent radiating elements which is based on metasurface isolation for MIMO and synthetic aperture radar (SAR) systems. This is achieved by choking surface current waves induced over the patch antenna by inserting a cross-shaped metasurface structure between the radiating elements. Each arm of the cross-shaped structure constituting the metasurface is etched with meander-line slot (MLS). Effectiveness of the metasurface is demonstrated for a2×2antenna array that operates over six frequency sub-bands in X, Ku and K-bands. With the proposed technique, the maximum improvement achieved in attenuating mutual coupling between neighbouring antennas is: 8.5 dB (8-8.4 GHz), 28 dB (9.6-10.8 GHz), 27 dB (11.7-12.6 GHz), 7.5 dB (13.4-14.2 GHz), 13 dB (16.5-16.8 GHz) and 22.5 dB (18.5-20.3 GHz). Furthermore, with the proposed technique (i) minimum center-to-center separation between the radiating elements can be reduced to 0.26λ0, where λ0 is 8.0 GHz; (ii) use of ground-plane or defected ground structures are unnecessary; (iii) use of short-circuited via-holes are avoided; (iv) it eliminates the issue with poor front-to-back ratio; and (v) it can be applied to existing arrays retrospectively.

Journal Article Type	Article
Acceptance Date	Oct 2, 2019
Online Publication Date	Oct 19, 2019
Publication Date	2019-11
Deposit Date	Oct 14, 2019
Publicly Available Date	Oct 14, 2019
Print ISSN	0048-6604
Publisher	American Geophysical Union
Peer Reviewed	Peer Reviewed
Volume	54
Issue	11
Pages	1067-1075
DOI	https://doi.org/10.1029/2019RS006871
Keywords	Metasurface isolator, MIMO, synthetic-aperture radar, Meander line slot (MLS), Mutual coupling, Antenna array
Public URL	http://researchrepository.napier.ac.uk/Output/2225545