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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
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.
Available under License Creative Commons Attribution Non-commercial No Derivatives.
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