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

This paper 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 other...

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Bibliographic Details
Published in:IEEE access 2019, Vol.7, p.51827-51840
Main Authors: Alibakhshikenari, Mohammad, Khalily, Mohsen, Virdee, Bal Singh, See, Chan Hwang, Abd-Alhameed, Raed A., Limiti, Ernesto
Format: Article
Language:English
Subjects:
Antenna arrays
Antenna measurements
Antennas
array antennas
Decoupling
decoupling slab
Electrical grounding
electromagnetic bandgap
Embedding
Energy gap
Frequency ranges
Metamaterial
Metamaterials
Microstrip antenna arrays
Microstrip transmission lines
MIMO (control systems)
multiple-input multiple-output
Mutual coupling
Photonic band gap
Short circuits
Slabs
Slits
Substrates
Synthetic aperture radar
Transmission lines
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Summary:This paper 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 9.12-9.96 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 and multiple-input multiple-output systems.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2019.2909950