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Mutual-Coupling Isolation Using Embedded Metamaterial EM Bandgap Decoupling Slab for Densely Packed Array Antennas

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

Authors

Mohammad Alibakhshikenari

Mohsen Khalily

Bal S. Virdee

Raed A. Abd-Alhameed

Ernesto Limiti



Abstract

This article presents a unique technique to enhance isolation between transmit/receive radiating elements in densely packed array antenna by embedding a metamaterial (MTM) electromagnetic bandgap (EMBG) structure in the space between the radiating elements to suppress surface currents that would otherwise contribute towards mutual coupling between the array elements. The proposed MTM-EMBG structure is a cross-shaped microstrip transmission line on which are imprinted two outward facing E-shaped slits. Unlike other MTM structures there is no short-circuit grounding using via-holes. With this approach, the maximum measured mutual coupling achieved is -60 dB @ 9.18 GHz between the transmit patches (#1 & #2) and receive patches (#3 & #4) in a four-element array antenna. Across the antenna’s measured operating frequency range of 9.12 to 9.96 GHz, the minimum measured isolation between each element of the array is 34.2 dB @ 9.48 GHz, and there is no degradation in radiation patterns. The average measured isolation over this frequency range is 47 dB. The results presented confirm the proposed technique is suitable in applications such as synthetic aperture radar (SAR) and multiple-input multiple-output (MIMO) systems.

Citation

Alibakhshikenari, M., Khalily, M., Virdee, B. S., Hwang See, C., Abd-Alhameed, R. A., & Limiti, E. (2019). Mutual-Coupling Isolation Using Embedded Metamaterial EM Bandgap Decoupling Slab for Densely Packed Array Antennas. IEEE Access, 9, 51827-51840. https://doi.org/10.1109/ACCESS.2019.2909950

Journal Article Type Article
Acceptance Date Mar 26, 2019
Online Publication Date Apr 9, 2019
Publication Date Apr 9, 2019
Deposit Date Apr 1, 2019
Publicly Available Date Apr 2, 2019
Journal IEEE Access
Electronic ISSN 2169-3536
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Volume 9
Pages 51827-51840
DOI https://doi.org/10.1109/ACCESS.2019.2909950
Keywords Metamaterial, electromagnetic bandgap, array antennas, decoupling slab, mutual coupling, synthetic aperture radar, multiple-input multiple-output.
Public URL http://researchrepository.napier.ac.uk/Output/1697993
Contract Date Apr 1, 2019

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(c) 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.









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