Isolation enhancement of densely packed array antennas with periodic MTM-photonic bandgap for SAR and MIMO systems

Alibakhshikenari, Mohammad, Virdee, Bal Singh, Shukla, Pancham, See, Chan, Abd-Alhameed, Raed, Khalily, Mohsen, Falcone, Francisco, Limiti, Ernesto, Quazzane, Karim and Parchin, Naser (2020) Isolation enhancement of densely packed array antennas with periodic MTM-photonic bandgap for SAR and MIMO systems. IET Microwaves, Antennas & Propagation, 14 (3). pp. 183-187. ISSN 1751-8725

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Abstract / Description

A metamaterial photonic bandgap (MTM-PBG) periodic structure is used as a decoupling frame to improve the isolation between transmit–receive (T/R) sections of densely packed array antenna in synthetic aperture radar (SAR) and multiple-input multiple-output (MIMO) systems. With this technique the MTM-PBG structure is shown to effectively suppress surface wave propagations between the T/R array antennas by an average of 12 dB. MTM-PBG layer comprises a periodic arrangement of dielectric circles etched in the cross-shaped microstrip frame that is inserted between the radiating elements. Unlike other recently reported methods, the advantages of the proposed technique are: (i) simplicity; (ii) cost effectiveness as there is no need for short-circuited via-holes or 3D metal walls; and (iii) can be retrofitted in existing array antennas. The proposed T/R array antennas were designed to operate over an arbitrary frequency range (9.25-11 GHz) with a fractional bandwidth (FBW) of 17.28%. With this technique (i) the side-lobes are reduced; (ii) there is minimal effect on the gain performance; and (iii) the minimum edge-to-edge gap between adjacent radiating elements can be reduced to 0.15lambda at 9.25 GHz.

Item Type:	Article
Uncontrolled Keywords:	Metamaterial (MTM), photonic bandgap (PBG), periodic structures, surface wave suppression, isolation, synthetic aperture radar (SAR), multiple-input multiple-output (MIMO).
Subjects:	600 Technology 600 Technology > 620 Engineering & allied operations
Department:	School of Computing and Digital Media
Depositing User:	Bal Virdee
Date Deposited:	30 Apr 2019 10:39
Last Modified:	24 Aug 2020 08:29
URI:	https://repository.londonmet.ac.uk/id/eprint/4780

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