Open AccessEnhanced isolation with defected ground structure in MIMO antenna
Author(s) -
Anitha R.,
Sarin V.P.,
Mohanan P.,
Vasudevan K.
Publication year - 2014
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2014.2795
Subject(s) - mimo , antenna (radio) , square (algebra) , isolation (microbiology) , patch antenna , coupling (piping) , acoustics , electronic engineering , physics , materials science , computer science , telecommunications , engineering , mathematics , geometry , beamforming , microbiology and biotechnology , biology , metallurgy
A defected ground structure (DGS) for improving isolation between four ports in a collocated multiple‐input–multiple‐output (MIMO) antenna is proposed. Isolation improvement by 7 dB is achieved by reducing surface waves within the dielectric substrate. Mutual coupling values as low as −25 dB are obtained along both the E ‐ and H ‐planes. The MIMO antenna includes a square patch antenna surrounded by a square ring patch antenna with the DGS etched in the form of a square ring. The DGS effectively suppresses the cross‐polarisation levels for all radiating modes. The design and effectiveness of the DGS in improving isolation for a fabricated 4‐port antenna are discussed.